Husbandry Manual for White's Seahorse Hippocampus Whitei

Total Page:16

File Type:pdf, Size:1020Kb

Husbandry Manual for White's Seahorse Hippocampus Whitei Husbandry Manual For White’s Seahorse Hippocampus whitei Actinopterygii : Syngnathidae Date By From Version 2008 Charisse Kate Pitargue WSI Richmond v 1 TABLE OF CONTENTS 1 INTRODUCTION............................................................................................................................... 5 2 TAXONOMY ...................................................................................................................................... 9 2.1 NOMENCLATURE ............................................................................................................................... 9 2.2 SUBSPECIES ....................................................................................................................................... 9 2.3 RECENT SYNONYMS .......................................................................................................................... 9 2.4 OTHER COMMON NAMES .................................................................................................................. 9 3 NATURAL HISTORY ......................................................................................................................10 3.1.1 MORPHOMETRICS ............................................................................................................................10 3.1.1 Mass And Basic Body Measurements ....................................................................................10 3.1.2 Sexual Dimorphism ................................................................................................................11 3.1.3 Distinguishing Features.........................................................................................................11 3.2 DISTRIBUTION AND HABITAT ...........................................................................................................12 3.3 CONSERVATION STATUS ..................................................................................................................12 3.4 LONGEVITY ......................................................................................................................................13 3.4.1 In the Wild .............................................................................................................................13 3.4.2 In Captivity ............................................................................................................................13 3.4.3 Techniques Used to Determine Age in Adults ........................................................................13 4 HOUSING REQUIREMENTS .........................................................................................................14 4.1 EXHIBIT/ENCLOSURE DESIGN ..........................................................................................................14 4.2 HOLDING AREA DESIGN ..................................................................................................................15 4.3 SPATIAL REQUIREMENTS .................................................................................................................15 4.4 POSITION OF ENCLOSURES ...............................................................................................................15 4.5 WEATHER PROTECTION ...................................................................................................................15 4.6 TEMPERATURE REQUIRMENTS……………………………………………………...………13 4.7 SUBSTRATE ......................................................................................................................................16 4.8 NESTBOXES AND/OR BEDDING MATERIAL .......................................................................................16 4.9 ENCLOSURE FURNISHINGS ...............................................................................................................17 5 GENERAL HUSBANDRY ...............................................................................................................18 5.2 HYGIENE AND CLEANING .................................................................................................................18 5.3 RECORD KEEPING ............................................................................................................................18 5.4 METHODS OF IDENTIFICATION .........................................................................................................19 5.5 ROUTINE DATA COLLECTION ...........................................................................................................20 6 FEEDING REQUIREMENTS ..........................................................................................................21 6.2 DIET IN THE WILD ............................................................................................................................21 6.3 CAPTIVE DIET ..................................................................................................................................21 6.4 SUPPLEMENTS ..................................................................................................................................22 6.5 PRESENTATION OF FOOD ..................................................................................................................23 7 HANDLING AND TRANSPORT ....................................................................................................24 7.2 TIMING OF CAPTURE AND HANDLING ..............................................................................................24 7.3 CATCHING BAGS ..............................................................................................................................24 7.4 CAPTURE AND RESTRAINT TECHNIQUES ..........................................................................................25 7.5 WEIGHING AND EXAMINATION ........................................................................................................25 7.6 RELEASE ..........................................................................................................................................26 7.7 TRANSPORT REQUIREMENTS ............................................................................................................27 2 7.7.1 Box Design .............................................................................................................................28 7.7.2 Furnishings ............................................................................................................................29 7.7.3 Water and Food .....................................................................................................................29 7.7.4 Animals per Box.....................................................................................................................30 7.7.5 Timing of Transportation .......................................................................................................30 8 HEALTH REQUIREMENTS ...........................................................................................................31 8.1 DAILY HEALTH CHECKS ..................................................................................................................31 8.2 DETAILED PHYSICAL EXAMINATION ................................................................................................32 8.3 ROUTINE TREATMENTS ....................................................................................................................32 8.4 KNOWN HEALTH PROBLEMS ............................................................................................................33 8.5 QUARANTINE REQUIREMENTS .........................................................................................................45 9 BEHAVIOUR ...........................................................................................................................................46 9.1ACTIVITY..............................................................................................................................................46 9.2SOCIAL BEHAVIOUR .............................................................................................................................46 9.3REPRODUCTIVE BEHAVIOUR ................................................................................................................46 9.4BATHING ..............................................................................................................................................46 9.5BEHAVIOURAL PROBLEMS ....................................................................................................................47 9.6BEHAVIOURAL ENRICHMENT................................................................................................................47 9.7INTRODUCTIONS AND REMOVALS .........................................................................................................47 9.8INTRASPECIFIC COMPATIBILITY............................................................................................................48 9.8.1INTERSPECIFIC COMPATIBILITY .........................................................................................................48 9.82SUITABILITY TO CAPTIVITY ................................................................................................................49 10 BREEDING .......................................................................................................................................50 10.1 MATING SYSTEM ........................................................................................................................50
Recommended publications
  • Origins of Language in Relation to Sexual Selection: the Effect of M
    h [ { { h [ { { 9 b a { 9 [ / Ç" Ü $ 9 " ò t '(( h [ { { L " Ç" Ü $ 9 " t * " " + $ + + , - + " L " + $ -- . / !.{Çw!/Ç Language can be viewed as sexual displays from an evolutionary perspective. As both sexes in humans contribute significantly to parental care, we can expect that both males and females use language to display their favourable qualities in order to attract potential mates. In this study, 50 participants (22 male, 28 female) rated 30 vignettes, in which a male or female protagonist attempted to impress an opposite sex friend in a conversation. In both male-female and female-male flirtations, conversations reveal- ing the speaker’s positive character traits were the most highly rated while those ex- plicitly showing the speaker’s sexual interest in the potential partner were the most poorly rated. Despite the similarities, there were significant sex differences in the rat- ings of some individual vignettes and item-groups. Such differences would be chiefly discussed from an evolutionary perspective. L The origins of language surely deserve and require a great deal of discussion among researchers from a wide range of disciplines. Based on my previous essay about the sexually attractive features of language (Szeto 2009), I will look into the relationship between sexual selection and language origins in greater depth, with a special focus on the effect of mutual mate choice on sex differences in speech content. ' h [ { { Despite the prevalence of elaborate animal communication systems, it is essen- tially unequivocal that humans are the only species which possess language (Barrett, Dunbar and Lycett 2002; Hurford 2006; Workman and Reader 2004).
    [Show full text]
  • Broad-Tailed Hummingbird Coloration and Sun Orientation 1
    1 Broad-tailed hummingbird coloration and sun orientation 1 Two ways to display: male hummingbirds show different 2 color-display tactics based on sun orientation 3 Running header: Broad-tailed hummingbird coloration and sun orientation 4 5 Richard K. Simpson1* and Kevin J. McGraw1 6 1School of Life Sciences, Arizona State University, Tempe, AZ 85287-4501 7 *Corresponding Author. Email: [email protected]; Phone: (480) 965-2593 8 9 ABSTRACT 10 Animals exhibit a diversity of ornaments and courtship behaviors, which often co- 11 occur and are used for communication. The sensory drive hypothesis states that these 12 traits evolved and vary due to interactions with each other, the environment, and signal 13 receiver. However, interactions between colorful ornaments and courtship behaviors, 14 specifically in relation to environmental variation, remain poorly understood. We studied 15 male iridescent plumage (gorgets), display behavior, and sun orientation during courtship 16 flights (shuttle displays) in broad-tailed hummingbirds (Selasphorus platycercus), to 17 understand how these traits interact in both space and time to produce the perceived 18 coloration of males. We also tested how gorget coloration varies among males based on 19 their plumage, behavioral, and morphological characteristics. In contrast with previous 20 work on other animals, we found that displaying males did not directionally face the sun, 21 but instead displayed on a continuum of solar orientation angles. The gorgets of males 22 who tended to face the sun during their displays appeared flashier (i.e. exhibited greater 23 color/brightness changes), brighter, and more colorful, whereas the gorgets of males who 2 Broad-tailed hummingbird coloration and sun orientation 24 tended to not face the sun were more consistently reflective (i.e.
    [Show full text]
  • Avian Monogamy
    (ISBN: 0-943610-45-1) AVIAN MONOGAMY EDITED BY PATRICIA ADAIR GOWATY AND DOUGLAS W. MOCK Department of Zoology University of Oklahoma Norman, Oklahoma 73019 ORNITHOLOGICAL MONOGRAPHS NO. 37 PUBLISHED BY THE AMERICAN ORNITHOLOGISTS' UNION WASHINGTON, D.C. 1985 AVIAN MONOGAMY ORNITHOLOGICAL MONOGRAPHS This series, published by the American Ornithologists' Union, has been estab- lished for major papers too long for inclusion in the Union's journal, The Auk. Publication has been made possiblethrough the generosityof the late Mrs. Carll Tucker and the Marcia Brady Tucker Foundation, Inc. Correspondenceconcerning manuscripts for publication in the seriesshould be addressedto the Editor, Dr. David W. Johnston,Department of Biology, George Mason University, Fairfax, VA 22030. Copies of Ornithological Monographs may be ordered from the Assistant to the Treasurer of the AOU, Frank R. Moore, Department of Biology, University of Southern Mississippi, Southern Station Box 5018, Hattiesburg, Mississippi 39406. (See price list on back and inside back covers.) OrnithologicalMonographs,No. 37, vi + 121 pp. Editors of Ornithological Monographs, Mercedes S. Foster and David W. Johnston Special Reviewers for this issue, Walter D. Koenig, Hastings Reservation, Star Route Box 80, Carmel Valley, CA 93924; Lewis W. Oring, De- partment of Biology,Box 8238, University Station, Grand Forks, ND 58202 Authors, Patricia Adair Gowaty, Department of BiologicalSciences, Clem- son University, Clemson, SC 29631; Douglas W. Mock, Department of Zoology, University of Oklahoma, Norman, OK 73019 First received, 23 August 1983; accepted29 February 1984; final revision completed 8 October 1984 Issued October 17, 1985 Price $11.00 prepaid ($9.00 to AOU members). Library of CongressCatalogue Card Number 85-647080 Printed by the Allen Press,Inc., Lawrence, Kansas 66044 Copyright ¸ by the American Ornithologists'Union, 1985 ISBN: 0-943610-45-1 ii AVIAN MONOGAMY EDITED BY PATRICIA ADAIR GOWATY AND DOUGLAS W.
    [Show full text]
  • Updated Checklist of Marine Fishes (Chordata: Craniata) from Portugal and the Proposed Extension of the Portuguese Continental Shelf
    European Journal of Taxonomy 73: 1-73 ISSN 2118-9773 http://dx.doi.org/10.5852/ejt.2014.73 www.europeanjournaloftaxonomy.eu 2014 · Carneiro M. et al. This work is licensed under a Creative Commons Attribution 3.0 License. Monograph urn:lsid:zoobank.org:pub:9A5F217D-8E7B-448A-9CAB-2CCC9CC6F857 Updated checklist of marine fishes (Chordata: Craniata) from Portugal and the proposed extension of the Portuguese continental shelf Miguel CARNEIRO1,5, Rogélia MARTINS2,6, Monica LANDI*,3,7 & Filipe O. COSTA4,8 1,2 DIV-RP (Modelling and Management Fishery Resources Division), Instituto Português do Mar e da Atmosfera, Av. Brasilia 1449-006 Lisboa, Portugal. E-mail: [email protected], [email protected] 3,4 CBMA (Centre of Molecular and Environmental Biology), Department of Biology, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal. E-mail: [email protected], [email protected] * corresponding author: [email protected] 5 urn:lsid:zoobank.org:author:90A98A50-327E-4648-9DCE-75709C7A2472 6 urn:lsid:zoobank.org:author:1EB6DE00-9E91-407C-B7C4-34F31F29FD88 7 urn:lsid:zoobank.org:author:6D3AC760-77F2-4CFA-B5C7-665CB07F4CEB 8 urn:lsid:zoobank.org:author:48E53CF3-71C8-403C-BECD-10B20B3C15B4 Abstract. The study of the Portuguese marine ichthyofauna has a long historical tradition, rooted back in the 18th Century. Here we present an annotated checklist of the marine fishes from Portuguese waters, including the area encompassed by the proposed extension of the Portuguese continental shelf and the Economic Exclusive Zone (EEZ). The list is based on historical literature records and taxon occurrence data obtained from natural history collections, together with new revisions and occurrences.
    [Show full text]
  • “The Secret Lives of Seahorses” Exhibit Press Kit Click on Headings Below to Go Directly to a Specific Page of the Press Kit
    “The Secret Lives of Seahorses” Exhibit Press Kit Click on headings below to go directly to a specific page of the press kit. 1. Main Exhibit News Release 2. Exhibit Fact Sheet 3. Exhibit Gallery Tour 4. Exhibit Animals 5. Seahorse Conservation News Release NEWS RELEASE FOR IMMEDIATE RELEASE For information contact: March 23, 2009 Angela Hains: (831) 647-6804; [email protected] Karen Jeffries: (831) 644-7548; [email protected] Ken Peterson: (831) 648-4922; [email protected] DURING ITS SILVER ANNIVERSARY YEAR, AQUARIUM UNVEILS “THE SECRET LIVES OF SEAHORSES” ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ New special exhibition offers an intimate look at these fascinating, fragile fishes Seahorses have been celebrated in art, literature and mythology for centuries, so you’d think we know a lot about them. In “The Secret Lives of Seahorses,” the Monterey Bay Aquarium’s new special exhibition, you’ll discover that nothing could be further from the truth. Beginning April 6, more than 15 species of seahorses, sea dragons and pipefish will beckon visitors into the elusive world of these charismatic creatures. The Secret Lives of Seahorses highlights the varied habitats in which seahorses and their relatives live, and shares important stories about the threats they face in the wild. “Seahorses are wonderful ambassadors for ocean conservation because they live in the most endangered habitats in the world – coral reefs, sea grass beds and mangrove forests,” said Ava Ferguson, senior exhibit developer for The Secret Lives of Seahorses. “When you save a seahorse, you also save some of Earth’s most precious marine habitats.” Through wrought-iron gates, visitors will enter the first gallery, “Seahorses and Kin,” and meet the seahorse family: fishes that have fused jaws and bony plates in place of the scales normally associated with fish.
    [Show full text]
  • Short Communications Courtship Display and Mating of the Superb
    Short Communications Courtship Display and Mating of the Superb Bird of Paradise Lophorina superba D.W. & C.B. FRITH "Prionodura':Paluma via Townsville, Queensland 4816 Emu 88, 183-188 Received 17 May 1987, accepted 9 October 1987 The Superb Bird of Paradise Lophorina superba inhabits December 1977 and November 1985 and we compared rainforest and forest edge between approximately 1000 these with those of the wild birds and descriptions by other and 2250 m above mean sea level (amsl) throughout authors. mainland New Guinea. The adult male is velvet black with metallic-like oil-green iridescent plumage on the crown, an Initial dkplay activily (IDA) erectile iridescent breast shield, and with a very long erectile and spreadable cape of modified velvet black nape This was observed seven times and consists of a sleeked feathers. Peculiar horn-like naral tufts of erectile rather stiff pose, held for about five seconds, before movement of black feathers adorn the base of the upper mandible, above cape, breast and naral tuft plumage. The male slightly the nostrils, as does a similar tuft of feathers beneath the crouches with breast shield sleeked tightly back against lower mandible. The female is cryptically coloured in himself, cape held back and down against the back, wings browns and greys with distinct blackish ventral bamng, and tail held normally, head and bill pointed upwards with like many other female paradisaeids (see Gilliard 1969; eyes fixed on the female, and naral tufts projecting conspic- Cooper & Forshaw 1977). First year male plumage is like uously forward and bifurcate (Fig. 1). This pose is followed that of the female, the black and iridescent plumage of by a repeated, sudden, upward and outward extension of adult males being acquired gradually over several years the breast shield, with head and bill still pointing at the (Gilliard 1969).
    [Show full text]
  • The Evolution of Leks Through Female Choice: Differential Clustering And
    BehavEcol Sociobiol (1992) 30:227-237 Behavioral Ecology and Sociobiology ? Springer-Verlag1992 The evolutionof leks throughfemale choice: differentialclustering and space utilizationin six sympatricmanakins Marc Thery C.N.R.S. - U.R.A. 1183, Mus6umNational d'Histoire Naturelle, Ecologie Generale,4 avenue du Petit-Chateau, F-91800 Brunoy, France Received October 1, 1990 / Accepted October 2, 1991 Summary.The degreeto which lekkingand non-lekking the increasingfemale home-rangesize could have led male manakinsselect display sites in order to maximise to the evolution of classicalleks. proximityto femaleswas examinedby contrastingmove- ments of females with male dispersion.Data on female visitingpatterns, male courtshipdisruption, and mating skew were also collected over three successivebreeding Introduction seasons. For the five lek-breedingspecies, female home- rangeswere 3-7 times largerthan those of adult males. Lek matingsystems, where males congregatefor the sole Femalemovements were concentrated around leks, fruit- purpose of attractingand courtingfemales, are typified ing places and streambathing sites. None of the females by a heavilybiased operational sex ratio and the inability monitoredby radio-trackingexpanded her normalrange of individualmales to economicallycontrol or monopo- in order to visit males on leks. On the contrary,feeding lize the resourcesessential for femaleacquisition (Emlen bouts of femalesfrequently preceded a visit to potential and Oring 1977). Across lek mating systems,male clus- mates at neighboringleks. Despite small sample sizes, teringis highly variableand can be dividedinto "classi- significant correlations were found between female cal leks" (Bradbury1977, 1981) also called "true leks" home-rangesize and male clustering(distances between (Oring 1982), where males are densely grouped within neighboring leks and distances between neighboring sight of each other, and "explodedleks" (Gilliard1963; males), as predicted by the female choice model and Snow 1970; Bradbury 1981; Foster 1983) or "quasi- the hotspot model.
    [Show full text]
  • Humboldt Bay Fishes
    Humboldt Bay Fishes ><((((º>`·._ .·´¯`·. _ .·´¯`·. ><((((º> ·´¯`·._.·´¯`·.. ><((((º>`·._ .·´¯`·. _ .·´¯`·. ><((((º> Acknowledgements The Humboldt Bay Harbor District would like to offer our sincere thanks and appreciation to the authors and photographers who have allowed us to use their work in this report. Photography and Illustrations We would like to thank the photographers and illustrators who have so graciously donated the use of their images for this publication. Andrey Dolgor Dan Gotshall Polar Research Institute of Marine Sea Challengers, Inc. Fisheries And Oceanography [email protected] [email protected] Michael Lanboeuf Milton Love [email protected] Marine Science Institute [email protected] Stephen Metherell Jacques Moreau [email protected] [email protected] Bernd Ueberschaer Clinton Bauder [email protected] [email protected] Fish descriptions contained in this report are from: Froese, R. and Pauly, D. Editors. 2003 FishBase. Worldwide Web electronic publication. http://www.fishbase.org/ 13 August 2003 Photographer Fish Photographer Bauder, Clinton wolf-eel Gotshall, Daniel W scalyhead sculpin Bauder, Clinton blackeye goby Gotshall, Daniel W speckled sanddab Bauder, Clinton spotted cusk-eel Gotshall, Daniel W. bocaccio Bauder, Clinton tube-snout Gotshall, Daniel W. brown rockfish Gotshall, Daniel W. yellowtail rockfish Flescher, Don american shad Gotshall, Daniel W. dover sole Flescher, Don stripped bass Gotshall, Daniel W. pacific sanddab Gotshall, Daniel W. kelp greenling Garcia-Franco, Mauricio louvar
    [Show full text]
  • History of Fishes - Structural Patterns and Trends in Diversification
    History of fishes - Structural Patterns and Trends in Diversification AGNATHANS = Jawless • Class – Pteraspidomorphi • Class – Myxini?? (living) • Class – Cephalaspidomorphi – Osteostraci – Anaspidiformes – Petromyzontiformes (living) Major Groups of Agnathans • 1. Osteostracida 2. Anaspida 3. Pteraspidomorphida • Hagfish and Lamprey = traditionally together in cyclostomata Jaws = GNATHOSTOMES • Gnathostomes: the jawed fishes -good evidence for gnathostome monophyly. • 4 major groups of jawed vertebrates: Extinct Acanthodii and Placodermi (know) Living Chondrichthyes and Osteichthyes • Living Chondrichthyans - usually divided into Selachii or Elasmobranchi (sharks and rays) and Holocephali (chimeroids). • • Living Osteichthyans commonly regarded as forming two major groups ‑ – Actinopterygii – Ray finned fish – Sarcopterygii (coelacanths, lungfish, Tetrapods). • SARCOPTERYGII = Coelacanths + (Dipnoi = Lung-fish) + Rhipidistian (Osteolepimorphi) = Tetrapod Ancestors (Eusthenopteron) Close to tetrapods Lungfish - Dipnoi • Three genera, Africa+Australian+South American ACTINOPTERYGII Bichirs – Cladistia = POLYPTERIFORMES Notable exception = Cladistia – Polypterus (bichirs) - Represented by 10 FW species - tropical Africa and one species - Erpetoichthys calabaricus – reedfish. Highly aberrant Cladistia - numerous uniquely derived features – long, independent evolution: – Strange dorsal finlets, Series spiracular ossicles, Peculiar urohyal bone and parasphenoid • But retain # primitive Actinopterygian features = heavy ganoid scales (external
    [Show full text]
  • Of the Americas
    iSeahorse.org – Saving Seahorses Together seahorses of the Americas Seahorses of the Americas Masters of Disguise There are currently fi ve recognized species of Seahorses are well-camoufl aged, and individuals seahorses (Hippocampus spp.) in the Americas, can be covered by seaweeds and sediments in one in the Pacifi c Ocean and four in the the wild. Color and lengths of skin fi laments (“hairs”) Atlantic. All of these American seahorses tend can vary for individuals within the same species to live in relatively shallow coastal areas with and so are NOT useful for identifi cation. Practice 3D-structured habitat, including seagrasses, your identifi cation skills before starting surveys. corals, and mangroves. Above: Potential seahorse habitats. Left to right: coral reef, seagrass bed, mangrove forest. Photos by Tse-Lynn Loh and Ria Tan/Wild Singapore. Seahorse Parts Hippocampus barbouri Coronet Trunk Eye spine Nose spine Dorsal fi n Cheek spines Snout Brood pouch (males only) Tail Female Male In females, the belly does not extend past the bottom of the dorsal fi n. If you are uncertain, it is likely male. Pacifi c Seahorses Don’t Know Which Seahorse Species? How to Photograph for ID For unknown species, record the Head length following characteristics: • Torso length Torso length (distance from top of coronet to base of dorsal fi n) • Head length (from immediately behind the operculum – the fl ap covering the gills – to tip of snout) • Snout length Snout length (from bump immediately in front of the eye to tip of snout) or Take a photo of the side profi le of the seahorse with a ruler and calculate these measurements from the photo.
    [Show full text]
  • Seahorse Manual
    Seahorse Manual 2010 Seahorse Manual ___________________________ David Garcia SEA LIFE Hanover, Germany Neil Garrick-Maidment The Seahorse Trust, England Seahorses are a very challenging species in husbandry and captive breeding terms and over the years there have been many attempts to keep them using a variety of methods. It is Sealife and The Seahorse Trust’s long term intention to be completely self-sufficient in seahorses and this manual has been put together to be used, to make this long term aim a reality. The manual covers all subjects necessary to keep seahorses from basic husbandry to indepth captive breeding. It is to be used throughout the Sealife group and is to act as a guide to aquarist’s intent on good husbandry of seahorses. This manual covers all aspects from basic set, up, water parameters, transportation, husbandry, to food types and preparation for all stages of seahorse life, from fry to adult. By including contact points it will allow for feedback, so that experience gained can be included in further editions, thus improving seahorse husbandry. Corresponding authors: David Garcia: [email protected] N. Garrick-Maidment email: [email protected] Keywords: Seahorses, Hippocampus species, Zostera marina, seagrass, home range, courtship, reproduction,, tagging, photoperiod, Phytoplankton, Zooplankton, Artemia, Rotifers, lighting, water, substrate, temperature, diseases, cultures, Zoe Marine, Selco, decapsulation, filtration, enrichment, gestation. Seahorse Manual 2010 David Garcia SEA LIFE Hanover,
    [Show full text]
  • Review of the Fossil Record of Sturgeons, Family Acipenseridae (Actinopterygii: Acipenseriformes), from North America
    J. Paleont., 80(4), 2006, pp. 672±683 Copyright q 2006, The Paleontological Society 0022-3360/06/0080-672$03.00 REVIEW OF THE FOSSIL RECORD OF STURGEONS, FAMILY ACIPENSERIDAE (ACTINOPTERYGII: ACIPENSERIFORMES), FROM NORTH AMERICA ERIC J. HILTON AND LANCE GRANDE Department of Geology, Field Museum of Natural History, 1400 South Lake Shore Drive, Chicago, Illinois 60605, ,ehilton@®eldmuseum.org., ,lgrande@®eldmuseum.org. ABSTRACTÐThe pre±Pleistocene fossil record of sturgeons (family Acipenseridae) from North America is reviewed based on a survey of reports in the literature and ®rsthand examination of specimens in museum collections. We provide a redescription of the only known specimen of ²Protoscaphirhynchus squamosus (Late Cretaceous, Montana), a very poorly preserved specimen for which few morpho- logical details can be determined. Three taxa described as species of the genus Acipenser from North America (²A. albertensis,²A. eruciferus, and ²A. ornatus) were described based on isolated and fragmentary remains, and are here considered to be nomina dubia. The earliest reported remains of North American sturgeons are from the Late Cretaceous (Santonian to Campanian Milk River For- mation). There is a relatively continuous record, with the exception of the Eocene and Oligocene, in which there are few (potentially in the Eocene) or no (Oligocene) known specimens available in collections. We have found that nearly all specimens are best regarded as Acipenseridae indeterminate genus and species due to their fragmentary preservation and lack
    [Show full text]