DOCSLIB.ORG

Ecphora QUARTERLY NEWSLETTER of the CALVERT MARINE MUSEUM FOSSIL CLUB Volume 14, Number 1 Winter 1998 Whole Number 46

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Ecphora QUARTERLY NEWSLETTER of the CALVERT MARINE MUSEUM FOSSIL CLUB Volume 14, Number 1 Winter 1998 Whole Number 46 The Ecphora QUARTERLY NEWSLETTER OF THE CALVERT MARINE MUSEUM FOSSIL CLUB Volume 14, Number 1 Winter 1998 Whole Number 46 Echinoderms - Our uncommon Invertebrates By Mike Ellwood E chi nod e r m s (Phylum the Keyser Limestone of western Echinodermata) include a number of Allegany County. Blastoids may familiar animals such as starfishes, possibly be found in the Greenbrier sea urchins, and sand dollars, as Limestone of Garrett County, well as less familiar forms such as although none have thus far been sea lilies or crinoids, cystoids, and reported. blastoids. Echinoderms are fairly The Eleu therozoa includes complex organisms with well• two groups of interest to collectors developed nervous and digestive in Calvert County - the stelleroids systems. The soft body parts are and the echinoids. The most housed in a calcareous exoskeleton important stelleroids are the (reversed from humans) made up of starfishes, which include the brittle many individual plates joined stars. Brittle stars are rare as together in intricate fashion, then fossils because their skeletons tend covered with a spiny skirr. Most to fall apart after death, and the echinoderms display a conspicuous parts scatter over the ocean floor. fivefold radial symmetry. The Collectors will occasionally find phylum contains two broad brittle star fossils in the St. Mary's groupings - PelmatDzoo (stalked Formation, either preserved inside forms fixed to the sea floor), and the valves of large bi-valve shells or Eleutherozoa (free-moving bottom preserved in limonite concretions. dwellers). Either way, they are rare, and Among the Pe1matozoa are the currently are found only in the crinoids, cystoids, and blastoids. Chesapeake Ranch Estates. Crinoids are most common in Echinoids include the sea Paleozoic rocks. In Maryland, stem urchins and sand dollars. An pieces and columns can readily be echinoid skeleton or test is collected from most of the Silurian, constructed of numerous flat calcite Devonian, and Mississippian marine plates arranged in radial rows. The units. Relatively complete crinoids skeleton is covered with skin which have been found in Maryland -in the is commonly studded with many Ridgeley Sandstone and in the movable spines of varying size. The shales of the Hamilton Group. spines enable the echinoid to move Cystoids were most abundant during freely over the sea bottom and are the Ordovician and Silurian periods, also utilized for protection. In and have been found in Maryland in Maryland, fossil echinoids are rarely collected complete. The most to weather out about every 20 years, common form appears to be a and give collectors a short period of Miocene sand dollar, Albertella time to find them, since the surf aberti, found in the Choptank tends to dismantle them quickly. Formation. Also found in the Collectors should keep a Choptank, is the Heart Urchin, sharp eye out for these unusual Echinocardium marylandiese, which invertebrate fossils, their rarity like most urchins was a colonial makes them important components animal. These colonies have tended of any Maryland collection. Greetings from Michigan! I just wanted to say thanks again to the CMM Fossil Club for the very nice surprise send-off just before I left, and for everyone's kind words and best wishes. I'm set up now at Michigan State University, and have already gone out to check on some late Pleistocene mastodon sites. The southern Michigan bogs and ponds that the bones come from aren't quite as scenic as Calvert Cliffs, but the geology and fossils are interesting. I've also been continuing with a variety of fossil shark research projects and working on some ways to improve and expand the fossil exhibits here. If any of you are ever heading up this way, drop by for a visit - my new address is: MSUMuseum, Michigan State University, East Lansing, MI, 48824-1045. Phone # 517-432-5480, e-mail [email protected]. THANKSAGAIN,and, as always, Happy Hunting! Mike Gottfried If you would like to submit an article to be included in the Ecphora please send it to: Calvert Marine Museum Fossil Club P.O. Box 321 Sykesville, MD 21784 The Calvert Marine Museum Fossil Club (CMMFC)is a non-profit organization. The Ecphora is the quarterly newsletter published by the CMMFC. The purpose of this newsletter is to provide better communication and to share information that may be of interest to the members of CMMFC.Articles which appear in the Ecphora are unedited and are published as submitted. Unless otherwise stated. articles published in the Ecphora are the views and opinions of the individual authors and do not necessarily reflect the views or the responsibility of the Calvert Marine Museum or the CMMFC. PRESIDENT'S MESSAGE I hope that everyone had a happy holiday season and that everyone is enjoying a prosperous New Year. Earlier this year Cheryl and I received a phone call from one Stephen Godfrey. He explained that he was a candidate for the position of Curator of Paleontology at the Calvert Marine Museum and that he would soon be making a visit to CMM for an interview. Stephen mentioned that his compact itinerary would allow him only one day to explore Calvert County and asked if it would be possible for someone to take him fossil collecting. We told him that we would be more than happy to make arrangements to meet with him and give him a "guided tour". It was our distinct pleasure to introduce Stephen to Dave and Paula Bohaska who helped us acquaint Stephen with fossil collecting on the Chesapeake Bay. This seemed to be a special treat for Stephen, as he is presently living in Alberta Canada, where fossil col• lecting is entirely different. After several hours of collecting we enjoyed the hospitality of Sandy Roberts, who served a de• licious lunch and supplied Stephen with Miocene fossil literature to take back to Canada. Our first impression of Stephen Godfrey was that he is extremely knowledgeable and that he is a very likable individual. We enjoyed his enthusiasm and sense of humor; we thought that he would be an asset to the museum and that he would be great to work with as the liaison to the fossil club. We said our "good-byes" with sincere wishes for him to attain the position. We were truly glad when Stephen called us with the news that he had been hired. The next day he surprised us with a fax, which is enclosed in this newsletter. Stephen should be officially "onboard" by early summer. As in past newsletters, I have discussed the importance of fossil collecting etiquette and I am once again compelled to remind everyone that we MUST always take responsibility for collecting in an ethical manner, that we MUST always observe the rights and wishes of property owners. Failure to do so could result in the closing of more fossil collecting sites and possible expulsion from the club. With verbal permission of Robert Sinibaldi, PhD, President of the Tampa Bay Club I am enclosing an article as it appeared in the December 1997 issue of the Tampa Bay Fossil Chronicles. If an incident such as this were to occur in our club, the member(s) inyolved would be dealt with, by the authority of club bylaw Article VI, Section 10 REMOVAL, which clearly states: "An officer derelict of his duties, and any member whose conduct is such that it is considered detrimental to the welfare or reputation of the club, may be removed from the membership by a two-thirds vote of the board of directors." I hope this is one by.law we never need to enforce. Cont. The election of this year's fossil club officers will be held at the spring meeting (see Coming Events). If your are considering one of the positions or would like to nominate someone, please call me at 410-795-8196 or write to me at P.O. BOX 321, SYKESVILLE, MD 21784 Let's thank Kathy Haberny for, once again, lining up field trips to some of our favorite sites and obtaining permission to visit someplace new and to Tom Haberny for his map making. Al Snelson TREASURER / MEMBERSHIP REPORT We have a balance of $2,402.23 in our account and currently we have 91 members. "Thanks" goes out to Samuel Shafer for his generous donation. Welcome to our newest members: Rodney and Beverly Battenfeld, Debra Derickson, Dwight and Karen Johnsen, Ken and Nancy Kaumeyer, Adrien and Patricia Malick, Peter Maratta, Joseph and Patricia Parker, John and Patricia Peddicord, Johnna Robinson, Leslie Rosenbaum, Robert Stoney and Anne Woodley. Cheryl Snelson MINUTES OF THE FALL MEETING The meeting was called to order at 1:00 p.m. by the Treasurer, Cheryl Snelson. The first order of business was the introduction of members. Those in attendance were: Pat Fink, Don Greaves, Tom and Kathy Haberny, Mike McCloskey, Don Patterson, Mary Piotrowski, Cheryl Snelson, Bernard and Flo Strean, Anne Woodley, Eric Woody and guest Dr. Conrad Labandeira. Next, Kathy Haberny reported on recent field trips and upcoming events for the spring and summer of 1998 (See Kathy's report). Cheryl presented her treasure/membership report, stating that we had $1,799.41 in our account and had four new members. Cheryl reminded the members that we were in need of articles for the winter Ecphora. Cheryl reported that CMM was still searching for a paleontologist to replace Mike Gottfried. Mike McCloskey suggested that a member of our club be permitted to participate in selecting a new paleontologist, to reinforce the clubs interests in a responsive leader. Pat Fink reported that the Prep Lab was in need of volunteers; if you are interested in a position contact Leslie Scher Brown at 410-326-2042.
Load more

Recommended publications
  • National Monitoring Program for Biodiversity and Non-Indigenous Species in Egypt
    UNITED NATIONS ENVIRONMENT PROGRAM MEDITERRANEAN ACTION PLAN REGIONAL ACTIVITY CENTRE FOR SPECIALLY PROTECTED AREAS National monitoring program for biodiversity and non-indigenous species in Egypt PROF. MOUSTAFA M. FOUDA April 2017 1 Study required and financed by: Regional Activity Centre for Specially Protected Areas Boulevard du Leader Yasser Arafat BP 337 1080 Tunis Cedex – Tunisie Responsible of the study: Mehdi Aissi, EcApMEDII Programme officer In charge of the study: Prof. Moustafa M. Fouda Mr. Mohamed Said Abdelwarith Mr. Mahmoud Fawzy Kamel Ministry of Environment, Egyptian Environmental Affairs Agency (EEAA) With the participation of: Name, qualification and original institution of all the participants in the study (field mission or participation of national institutions) 2 TABLE OF CONTENTS page Acknowledgements 4 Preamble 5 Chapter 1: Introduction 9 Chapter 2: Institutional and regulatory aspects 40 Chapter 3: Scientific Aspects 49 Chapter 4: Development of monitoring program 59 Chapter 5: Existing Monitoring Program in Egypt 91 1. Monitoring program for habitat mapping 103 2. Marine MAMMALS monitoring program 109 3. Marine Turtles Monitoring Program 115 4. Monitoring Program for Seabirds 118 5. Non-Indigenous Species Monitoring Program 123 Chapter 6: Implementation / Operational Plan 131 Selected References 133 Annexes 143 3 AKNOWLEGEMENTS We would like to thank RAC/ SPA and EU for providing financial and technical assistances to prepare this monitoring programme. The preparation of this programme was the result of several contacts and interviews with many stakeholders from Government, research institutions, NGOs and fishermen. The author would like to express thanks to all for their support. In addition; we would like to acknowledge all participants who attended the workshop and represented the following institutions: 1.
    [Show full text]
  • Age Structure, Growth and Shell Form of Cerastoderma Glaucum (Bivalvia
    Age structure, growth and shell form of Cerastoderma glaucum (Bivalvia: Cardiidae) from El Mellah lagoon, Algeria Lamia Bensaâd-Bendjedid, Saber Belhaoues, Asma Kerdoussi, Naouel Djebbari, Mardja Tahri, Mourad Bensouilah Laboratory of Ecobiology for Marine Environment and Coastlines, Faculty of Science, Badji Mokhtar University, Annaba 23000, Algeria. Corresponding author: L. Bensaâd-Benjedid, [email protected] Abstract. Cerastoderma glaucum (Poiret, 1789) the lagoon specialist cockle, represents one of the most abundant molluscs in El Mellah coastal lagoon (northeastern Algeria); several morphological and biological characteristics of this species were investigated over a period of 18 months (January 2014 to June 2015). Analysis of allometry and different morphometric indices indicate that this population tends to assume a globular shell shape which becomes elongated as the cockle grows. From length-frequency data examination using software FiSAT II and VONBIT for Excel, age was ranged from the first to the third year old, asymptotic length (L∞) was estimated to 48.061 mm and growth coefficient (K) was 0.71 -1 yr . The growth performance index (Φ′) and theoretical life span (tmax) were 3.21 and 4.23 yr respectively, total mortality rate (Z) obtained was 1.94 yr-1. Monthly variations in condition index were noticed, two sharp falls due spawning events were observed, the first spawning occurred between March and June and, the second one took place from August to October. The findings of the current study can be utilized to guide future research in various fields as pathology, biomonitoring and environmental management of this species. Key Words: Cerastoderma glaucum, shell shape, growth, Condition index, Algeria.
    [Show full text]
  • Geoducks—A Compendium
    34, NUMBER 1 VOLUME JOURNAL OF SHELLFISH RESEARCH APRIL 2015 JOURNAL OF SHELLFISH RESEARCH Vol. 34, No. 1 APRIL 2015 JOURNAL OF SHELLFISH RESEARCH CONTENTS VOLUME 34, NUMBER 1 APRIL 2015 Geoducks — A compendium ...................................................................... 1 Brent Vadopalas and Jonathan P. Davis .......................................................................................... 3 Paul E. Gribben and Kevin G. Heasman Developing fisheries and aquaculture industries for Panopea zelandica in New Zealand ............................... 5 Ignacio Leyva-Valencia, Pedro Cruz-Hernandez, Sergio T. Alvarez-Castaneda,~ Delia I. Rojas-Posadas, Miguel M. Correa-Ramırez, Brent Vadopalas and Daniel B. Lluch-Cota Phylogeny and phylogeography of the geoduck Panopea (Bivalvia: Hiatellidae) ..................................... 11 J. Jesus Bautista-Romero, Sergio Scarry Gonzalez-Pel aez, Enrique Morales-Bojorquez, Jose Angel Hidalgo-de-la-Toba and Daniel Bernardo Lluch-Cota Sinusoidal function modeling applied to age validation of geoducks Panopea generosa and Panopea globosa ................. 21 Brent Vadopalas, Jonathan P. Davis and Carolyn S. Friedman Maturation, spawning, and fecundity of the farmed Pacific geoduck Panopea generosa in Puget Sound, Washington ............ 31 Bianca Arney, Wenshan Liu, Ian Forster, R. Scott McKinley and Christopher M. Pearce Temperature and food-ration optimization in the hatchery culture of juveniles of the Pacific geoduck Panopea generosa ......... 39 Alejandra Ferreira-Arrieta, Zaul Garcıa-Esquivel, Marco A. Gonzalez-G omez and Enrique Valenzuela-Espinoza Growth, survival, and feeding rates for the geoduck Panopea globosa during larval development ......................... 55 Sandra Tapia-Morales, Zaul Garcıa-Esquivel, Brent Vadopalas and Jonathan Davis Growth and burrowing rates of juvenile geoducks Panopea generosa and Panopea globosa under laboratory conditions .......... 63 Fabiola G. Arcos-Ortega, Santiago J. Sanchez Leon–Hing, Carmen Rodriguez-Jaramillo, Mario A.
    [Show full text]
  • Systematic Comparison of Sea Urchin and Sea Star Developmental Gene Regulatory Networks Explains How Novelty Is Incorporated in Early Development
    ARTICLE https://doi.org/10.1038/s41467-020-20023-4 OPEN Systematic comparison of sea urchin and sea star developmental gene regulatory networks explains how novelty is incorporated in early development Gregory A. Cary 1,3,5, Brenna S. McCauley1,4,5, Olga Zueva1, Joseph Pattinato1, William Longabaugh2 & ✉ Veronica F. Hinman 1 1234567890():,; The extensive array of morphological diversity among animal taxa represents the product of millions of years of evolution. Morphology is the output of development, therefore phenotypic evolution arises from changes to the topology of the gene regulatory networks (GRNs) that control the highly coordinated process of embryogenesis. A particular challenge in under- standing the origins of animal diversity lies in determining how GRNs incorporate novelty while preserving the overall stability of the network, and hence, embryonic viability. Here we assemble a comprehensive GRN for endomesoderm specification in the sea star from zygote through gastrulation that corresponds to the GRN for sea urchin development of equivalent territories and stages. Comparison of the GRNs identifies how novelty is incorporated in early development. We show how the GRN is resilient to the introduction of a transcription factor, pmar1, the inclusion of which leads to a switch between two stable modes of Delta-Notch signaling. Signaling pathways can function in multiple modes and we propose that GRN changes that lead to switches between modes may be a common evolutionary mechanism for changes in embryogenesis. Our data additionally proposes a model in which evolutionarily conserved network motifs, or kernels, may function throughout development to stabilize these signaling transitions. 1 Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
    [Show full text]
  • Detrital Zircon Provenance and Lithofacies Associations Of
    geosciences Article Detrital Zircon Provenance and Lithofacies Associations of Montmorillonitic Sands in the Maastrichtian Ripley Formation: Implications for Mississippi Embayment Paleodrainage Patterns and Paleogeography Jennifer N. Gifford 1,*, Elizabeth J. Vitale 1, Brian F. Platt 1 , David H. Malone 2 and Inoka H. Widanagamage 1 1 Department of Geology and Geological Engineering, University of Mississippi, Oxford, MS 38677, USA; [email protected] (E.J.V.); [email protected] (B.F.P.); [email protected] (I.H.W.) 2 Department of Geography, Geology, and the Environment, Illinois State University, Normal, IL 61790, USA; [email protected] * Correspondence: jngiff[email protected]; Tel.: +1-(662)-915-2079 Received: 17 January 2020; Accepted: 15 February 2020; Published: 22 February 2020 Abstract: We provide new detrital zircon evidence to support a Maastrichtian age for the establishment of the present-day Mississippi River drainage system. Fieldwork conducted in Pontotoc County,Mississippi, targeted two sites containing montmorillonitic sand in the Maastrichtian Ripley Formation. U-Pb detrital zircon (DZ) ages from these sands (n = 649) ranged from Mesoarchean (~2870 Ma) to Pennsylvanian (~305 Ma) and contained ~91% Appalachian-derived grains, including Appalachian–Ouachita, Gondwanan Terranes, and Grenville source terranes. Other minor source regions include the Mid-Continent Granite–Rhyolite Province, Yavapai–Mazatzal, Trans-Hudson/Penokean, and Superior. This indicates that sediment sourced from the Appalachian Foreland Basin (with very minor input from a northern or northwestern source) was being routed through the Mississippi Embayment (MSE) in the Maastrichtian. We recognize six lithofacies in the field areas interpreted as barrier island to shelf environments. Statistically significant differences between DZ populations and clay mineralogy from both sites indicate that two distinct fluvial systems emptied into a shared back-barrier setting, which experienced volcanic ash input.
    [Show full text]
  • (Echinodermata: Holothuroidea) from the Latest Cretaceous Of
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Universität München: Elektronischen Publikationen 285 Zitteliana 89 Short Communication First report of sea cucumbers (Echinodermata: Holothuroidea) from the latest Cretaceous of Paläontologie Bayerische Bavaria,GeoBio- Germany & Geobiologie Center Staatssammlung 1,2,3 LMU München für Paläontologie und Geologie LMUMike MünchenReich 1 n München, 01.07.2017 SNSB - Bayerische Staatssammlung für Paläontologie und Geologie, Richard-Wagner-Straße 10, 80333 Munich, Germany 2 n Manuscript received Ludwig-Maximilians-Universität München, Department für Geo- und Umweltwissenschaften, 30.12.2016; revision ac- Paläontologie und Geobiologie, Richard-Wagner-Straße 10, 80333 Munich, Germany 3 cepted 21.01.2017 GeoBio-Center der Ludwig-Maximilians-Universität München, Richard-Wagner-Straße 10, 80333 Munich, Germany n ISSN 0373-9627 E-mail: [email protected] n ISBN 978-3-946705-00-0 Zitteliana 89, 285–289. Key words: fossil Holothuroidea; Cretaceous; Maastrichtian; Bavaria; Germany Schüsselwörter: fossile Holothuroidea; Kreide; Maastrichtium; Bayern; Deutschland The Bavarian Gerhardtsreit Formation (‶Gerhardts- 1993; Smith 2004) due to different reasons (Reich reiter Mergel″ / ‶Gerhardtsreiter Schichten″; cf. 2013). There are nearly 1,700 valid extant sea cucum- Böhm 1891; Hagn 1960; Wagreich et al. 2004), also ber species (Smiley 1994; Kerr 2003; Paulay pers. known as Gerhartsreit Formation (‶Gerhartsreiter comm.) known worldwide. The fossil record (since Schichten″; Hagn et al. 1981, 1992; Schwarzhans the Middle Ordovician; Reich 1999, 2010), by con- 2010; Pollerspöck & Beaury 2014) or ‶Gerhards- trast, is discontinuous in time and recorded ranges reuter Schichten″ (Egger 1899; Hagn & Hölzl 1952; of species with around 1,000 reported forms (Reich de Klasz 1956; Herm 1979, 2000) is exposed in Up- 2013, 2014, 2015b) since the early 19th century.
    [Show full text]
  • A Fossiliferous Spherule-Rich Bed at the Cretaceous–Paleogene (K–Pg) Boundary in 1 Mississippi, USA: Implications for the K
    1 A fossiliferous spherule-rich bed at the Cretaceous–Paleogene (K–Pg) boundary in 2 Mississippi, USA: implications for the K–Pg mass extinction event in the Mississippi 3 Embayment and Eastern Gulf Coastal Plain 4 James D. Witts1, Neil H. Landman1, Matthew P. Garb2, Caitlin Boas2, Ekaterina Larina3, 5 Remy Rovelli4, Lucy E. Edwards5, Robert M. Sherrell6,7, and J. Kirk Cochran8 6 1Division of Paleontology (Invertebrates), American Museum of Natural History, New York, 7 NY 10024, USA 8 2Department of Earth and Environmental Sciences, Brooklyn College, Brooklyn, NY 11210, 9 USA 10 3University of Southern California, Department of Earth Sciences, Los Angeles, CA 90018, 11 USA 12 4Department of Earth and Planetary Sciences, The University of New Mexico, Albuquerque, 13 NM 87131, USA 14 5U.S. Geological Survey, Mail Stop 926A, Reston, VA 20192, USA 15 6Department of Marine and Coastal Sciences, Rutgers University, Piscataway, NJ 08901, 16 USA 17 7 Department of Earth and Planetary Sciences, Rutgers University, Piscataway, NJ 08901, 18 USA 19 8School of Marine and Atmospheric Science, Stony Brook University, Stony Brook, NY 11794, 20 USA 21 [The final, fully formatted version of this article is available online at Cretaceous Research: 22 https://doi.org/10.1016/j.cretres.2018.06.002 ] 23 Abstract 24 We describe an outcrop of the Cretaceous–Paleogene (K–Pg) boundary exposed due 25 to construction near New Albany, Union County, Mississippi. It consists of the Owl Creek 26 Formation and overlying Clayton Formation. The Owl Creek Formation is rich in the 27 ammonites Discoscaphites iris and Eubaculites carinatus, which, along with 28 biostratigraphically important dinoflagellate cysts and calcareous nannofossils, indicate 29 deposition occurred within the last 1 million years, most likely last 500 kyrs, of the 30 Cretaceous.
    [Show full text]
  • Brittle-Star Mass Occurrence on a Late Cretaceous Methane Seep from South Dakota, USA Received: 16 May 2018 Ben Thuy1, Neil H
    www.nature.com/scientificreports OPEN Brittle-star mass occurrence on a Late Cretaceous methane seep from South Dakota, USA Received: 16 May 2018 Ben Thuy1, Neil H. Landman2, Neal L. Larson3 & Lea D. Numberger-Thuy1 Accepted: 29 May 2018 Articulated brittle stars are rare fossils because the skeleton rapidly disintegrates after death and only Published: xx xx xxxx fossilises intact under special conditions. Here, we describe an extraordinary mass occurrence of the ophiacanthid ophiuroid Brezinacantha tolis gen. et sp. nov., preserved as articulated skeletons from an upper Campanian (Late Cretaceous) methane seep of South Dakota. It is uniquely the frst fossil case of a seep-associated ophiuroid. The articulated skeletons overlie centimeter-thick accumulations of dissociated skeletal parts, suggesting lifetime densities of approximately 1000 individuals per m2, persisting at that particular location for several generations. The ophiuroid skeletons on top of the occurrence were preserved intact most probably because of increased methane seepage, killing the individuals and inducing rapid cementation, rather than due to storm-induced burial or slumping. The mass occurrence described herein is an unambiguous case of an autochthonous, dense ophiuroid community that persisted at a particular spot for some time. Thus, it represents a true fossil equivalent of a recent ophiuroid dense bed, unlike other cases that were used in the past to substantiate the claim of a mid-Mesozoic predation-induced decline of ophiuroid dense beds. Brittle stars, or ophiuroids, are among the most abundant and widespread components of the marine benthos, occurring at all depths and latitudes of the world oceans1. Most of the time, however, ophiuroids tend to live a cryptic life hidden under rocks, inside sponges, epizoic on corals or buried in the mud (e.g.2) to such a point that their real abundance is rarely appreciated at frst sight.
    [Show full text]
  • Download PDF Version
    MarLIN Marine Information Network Information on the species and habitats around the coasts and sea of the British Isles Lagoon cockle (Cerastoderma glaucum) MarLIN – Marine Life Information Network Biology and Sensitivity Key Information Review Nicola White 2002-07-15 A report from: The Marine Life Information Network, Marine Biological Association of the United Kingdom. Please note. This MarESA report is a dated version of the online review. Please refer to the website for the most up-to-date version [https://www.marlin.ac.uk/species/detail/1315]. All terms and the MarESA methodology are outlined on the website (https://www.marlin.ac.uk) This review can be cited as: White, N. 2002. Cerastoderma glaucum Lagoon cockle. In Tyler-Walters H. and Hiscock K. (eds) Marine Life Information Network: Biology and Sensitivity Key Information Reviews, [on-line]. Plymouth: Marine Biological Association of the United Kingdom. DOI https://dx.doi.org/10.17031/marlinsp.1315.1 The information (TEXT ONLY) provided by the Marine Life Information Network (MarLIN) is licensed under a Creative Commons Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales License. Note that images and other media featured on this page are each governed by their own terms and conditions and they may or may not be available for reuse. Permissions beyond the scope of this license are available here. Based on a work at www.marlin.ac.uk (page left blank) Date: 2002-07-15 Lagoon cockle (Cerastoderma glaucum) - Marine Life Information Network See online review for distribution map Three Cerastoderma glaucum with siphons extended. Distribution data supplied by the Ocean Photographer: Dennis R.
    [Show full text]
  • Aspects of Life Mode Among Ordovician Asteroids: Implications of New Specimens from Baltica
    Aspects of life mode among Ordovician asteroids: Implications of new specimens from Baltica DANIEL B. BLAKE and SERGEI ROZHNOV Blake, D.B. and Rozhnov, S. 2007. Aspects of life mode among Ordovician asteroids: Implications of new specimens from Baltica. Acta Palaeontologica Polonica 52 (3): 519–533. A new genus and species of Asteroidea (Echinodermata), Estoniaster maennili, is described from the Upper Ordovician (Caradocian) of Estonia; it is similar to the western European genus Platanaster and the North American Lanthanaster and an as yet unpublished new genus. Specimens of Urasterella? sp. and Cnemidactis sp. are recognized from the Middle Ordovician of northwest Russia; although similar to known species, incomplete preservation precludes more precise tax− onomic assessment. Asteroids are important in many existing marine communities, and in spite of a meager fossil record, diversity suggests they were important in the early Paleozoic as well. Some debate has centered on arm flexibility in early asteroids, which bears on their roles in their communities. Parallels in ambulacral series arrangement between Ordovician and extant species and presence of an ambulacral furrow indicate similar broad ranges of motion and therefore potentially parallel ecologic roles. Many factors might have contributed to the differences between ancient and extant ambulacral ar− ticulation, including changes in positioning of a part of the water vascular system, changes in predation and bioturbation pressures, and taphonomic events that obscure skeletal details. Key words: Echinodermata, Asteroidea, functional morphology, Ordovician, Baltica. Daniel B. Blake [[email protected]], Department of Geology, University of Illinois, 1301 W. Green St., Urbana 61801, IL, USA; Sergei Rozhnov [[email protected]], Paleontological Institute, Russian Academy of Sciences, Profsoyusnaya 123, Mos− cow, 117647, Russia.
    [Show full text]
  • Distant Learning for Middle School Science for STUDENTS!
    St. Louis Public Schools Continuous Learning for Students Middle School Science Welcome to Distant Learning for Middle School Science for STUDENTS! Students are encouraged to maintain contact with their home school and classroom teacher(s). If you have not already done so, please visit your child’s school website to access individual teacher web pages for specific learning/assignment information. If you cannot reach your teacher and have elected to use these resources, please be mindful that some learning activities may require students to reply online, while others may require students to respond using paper and pencil. In the event online access is not available and the teacher cannot be reached, responses should be recorded on paper and completed work should be dropped off at your child’s school. Please contact your child’s school for the dates and times to drop off your child’s work. If you need additional resources to support virtual learning, please visit: https://www.slps.org/extendedresources Overview of Week 6: Students engage with the performance task Evolution of Andes where they use what they know about the rock cycle and how earth systems interact (weeks 3-5 (April 6-24) of Continuous Learning plans) to create a model of how the growing Andes could have led to the sloths living in the Amazon and write an argument about how the Andes led to the sloths using their model as evidence. Students will present their final model and argument via PowerPoint slides, essay, or poster. To access all instructional fillable pdf files, also available in print, for Week 6 go HERE.
    [Show full text]
  • A New Bathyal Ophiacanthid Brittle Star (Ophiuroidea: Ophiacanthidae) with Caribbean Affinities from the Plio-Pleistocene of the Mediterranean
    Zootaxa 4820 (1): 019–030 ISSN 1175-5326 (print edition) https://www.mapress.com/j/zt/ Article ZOOTAXA Copyright © 2020 Magnolia Press ISSN 1175-5334 (online edition) https://doi.org/10.11646/zootaxa.4820.1.2 http://zoobank.org/urn:lsid:zoobank.org:pub:ED703EC8-3124-413F-8B17-3C1695B789C5 A new bathyal ophiacanthid brittle star (Ophiuroidea: Ophiacanthidae) with Caribbean affinities from the Plio-Pleistocene of the Mediterranean LEA D. NUMBERGER-THUY & BEN THUY* Natural History Museum Luxembourg, Department of Palaeontology, 25, rue Münster, 2160 Luxembourg, Luxembourg; https://orcid.org/0000-0001-6097-995X *corresponding author: [email protected]; https://orcid.org/0000-0001-8231-9565 Abstract Identifiable remains of large deep-sea invertebrates are exceedingly rare in the fossil record. Thus, every new discovery adds to a better understanding of ancient deep-sea environments based on direct fossil evidence. Here we describe a collection of dissociated skeletal parts of ophiuroids (brittle stars) from the latest Pliocene to earliest Pleistocene of Sicily, Italy, preserved as microfossils in sediments deposited at shallow bathyal depths. The material belongs to a previously unknown species of ophiacanthid brittle star, Ophiacantha oceani sp. nov. On the basis of morphological comparison of skeletal microstructures, in particular spine articulations and vertebral articular structures of the lateral arm plates, we conclude that the new species shares closest ties with Ophiacantha stellata, a recent species living in the present-day Caribbean at bathyal depths. Since colonization of the deep Mediterranean following the Messinian crisis at the end of the Miocene was only possibly via the Gibraltar Sill, the presence of tropical western Atlantic clades in the Plio-Pleistocene of the Mediterranean suggests a major deep-sea faunal turnover yet to be explored.
    [Show full text]