DOCSLIB.ORG

NOTES on ANTROSELATES HUBRICHT, 1963 and ANTROBIA HUBRICHT, 1971 (GASTROPODA: HYDROBIIDAE) Robert Hershler and Leslie Hubricht

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
NOTES on ANTROSELATES HUBRICHT, 1963 and ANTROBIA HUBRICHT, 1971 (GASTROPODA: HYDROBIIDAE) Robert Hershler and Leslie Hubricht 7 December 1988 PROC. BIOL. SOC. WASH. 101(4), 1988, pp. 730-740 NOTES ON ANTROSELATES HUBRICHT, 1963 AND ANTROBIA HUBRICHT, 1971 (GASTROPODA: HYDROBIIDAE) Robert Hershler and Leslie Hubricht Abstract. —Antroselates Hubricht, 1963 and Antrobia Hubricht, 1971, mono- typic cavesnail genera from eastern United States, are redescribed. The presence of a spermathecal duct in the female reproductive system of these snails in- dicates that, contrary to earlier opinions, they belong to the Hydrobiidae: Lit- toridininae. Both genera are well-differentiated members of the Cochliopina Morrison, 1946 group, characterized by possession of trochoidal shells and simple penes. The monotypic genera Antroselates and tate surface lined by spiral grooves. Aper- Antrobia are poorly known members of the ture enlarged, with expanded outer lip. Um- North American aquatic cavesnail (Gas- bilicus narrowly to broadly open. tropoda: Hydrobiidae) fauna. Initial de- Operculum paucispiral, with rapidly ex- scriptions of these unusual-shelled snails panding whorls. Animal blind, unpigment- lacked critical details from soft-part mor- ed. Basal cusps of central radular teeth phology and speculations on their affinities emerging from lateral angles. Cephalic ten- have varied considerably. Antroselates, for tacles without hypertrophied ciliary tufts. instance, was initially considered a hydro- Ctenidium broad and elongate, with ca. 25 biid (Hubricht 1963:138), but also has been filaments. Intestine with coil in pallial roof. placed in the Micromelaniidae (Taylor 1966: Penis simple, flagellate, non-glandular; sur- 171, Burch 1982:3). During the course of face of distal portion striated. Females ovip- an ongoing review of North American cav- arous. Spermathecal duct present, connect- esnails, we examined what may be the only ing posteriorly with albumen gland and alcohol-preserved material available for anteriorly with capsule gland. Oviduct these genera and determined that, contrary opening into ventral surface of albumen to all previous assertions, both are well-dif- gland. Bursa copulatrix large, positioned ferentiated members of the Cochliopina partly posterior to albumen gland. group of Hydrobiidae: Littoridininae (Her- Remarks. — Placement of this genus in the shler 1985). Redescriptions of Antroselates Micromelaniidae was based on the incorrect and Antrobia follow. observation that the central radular teeth lacked basal cusps (Hubricht 1963:138). We Antroselates Hubricht, 1963 assign the genus to the Hydrobiidae: Lit- toridininae on the basis of possession of a Antroselates Hubricht, 1963:138. Type spermathecal duct in the female reproduc- species, Antroselates spiralis Hubricht, tive system (see Davis et al. 1982, Hershler 1963, by monotypy and original desig- 1985). The globose shell and simple penis nation. indicate assignment to the informal Coch- Diagnosis.— Shell small, solid, trochoid- liopina group (Hershler 1985). Affinity with low conic, with 4.5 rounded whorls sculp- Antrobia is indicated by similarity of pro- tured with numerous elevated spiral lines. toconch sculpture and duct arrangements in Protoconch tilted or depressed, with punc- the pallial oviduct complex (including VOLUME 101, NUMBER 4 731 unique connection between spermathecal caecal chamber. Intestinal loop filling pos- duct and albumen gland). These snails are, terior half of pallial roof (Fig. 2b). Osphra- however, separable by differences in shell, dium filling 25-33% of ctenidium length. penial and radular morphology. Testis (Ts, Fig. 2b) massive, covering stomach and extending from posterior edge Antroselates spiralis Hubricht of prostate gland (overlapping most of Figs. 1, 2, 3a-c, 4 stomach) almost to posterior end of animal. Branches of testis bearing numerous grape- Antroselates spiralis Hubricht, 1963:138- like lobes and draining to narrow, thin vas 139, pi. 8, figs, a, b; (Holotype FMNH efferens. Seminal vesicle consisting of a few 116916).-Burch 1982:108, fig. 108. thickened coils ventral to anterior testis. Material examined. — Kentucky. Ed- Prostate gland (Fig. 2d) thickened, near-cir- mondson County: Echo River Spring, cular in outline; almost entire length posi- Mammoth Cave National Park, USNM tioned in pallial roof. Vas deferens entering 673526 (paratypes), USNM 673527 (para- and exiting antero-ventral portion of gland; types); River Styx, Mammoth Cave, Mam- anterior portion of duct having thickened moth Cave National Park, UF 40624 (al- coil. Penis emerging from behind right ce- cohol series [unrelaxed]). phalic tentacle, large relative to head (Fig. Description.—Shell (Fig. 1) 4.3-5.2 mm 2c), with a tight clockwise coil. Penis (Fig. in height, slightly taller than wide. Whorls 3a) unciliated, vermiform, with short distal- shouldered adapically, sutures slightly in- most section tapering gently. Vas deferens dented. Body whorl enlarged, spire rela- having thickened coils in base of penis; duct tively small. Shell white-clear, translucent, undulating in penis. Distal half of structure with amber periostracum. Surface typically striated (Fig. 3a), with surface consisting of eroded with small holes. Protoconch surface broad ridges alternating with narrow fur- slightly pitted; spiral grooves (Fig. 1 d) fairly rows (Fig. 3b). Terminus (Fig. 3c) thick- broad and slightly depressed. Spiral lines of ened, smooth. Opening of vas deferens ter- irregular height crossing strong growth lines minal, simple. on teleoconch (Fig. lb, c). Aperture ellip- Ovary a simple lobed mass filling about soidal, longer than wide, rounded above and one half whorl behind posterior edge of somewhat angled below, and tilted relative stomach. Albumen and capsule glands (Ag, to coiling axis, with anterior side advanced. Cg, Fig. 2e) about equal in length; capsule Inner lip somewhat thickened and reflected gland bipartite (posterior section much below, broadly adnate to body whorl above. longer). Oviduct (Ov) with single, thickened Outer lip thin. Operculum (Fig. 2a) thin, coil on left side of albumen gland. Kidney- amber-colored, with pronounced growth shaped bursa copulatrix pressed against and lines. slightly overlapping posterior edge of al- Animal of three whorls (Fig. lb). Proxi- bumen gland. Bursa duct narrow" (Dbu). mal portions of tentacles without any ex- Seminal receptacle (Sr) small, almost duct- ternally visible vestiges of eyespots. Gen- less, pear-shaped, positioned on left side of eralized formulae of radular teeth (Fig. 4): albumen gland and slightly overlapping central, 5(6)-l-5(6)/3-3; lateral, 4(5)-1-4(5); bursa. Oviduct without connection to al- inner marginal, 15-18; outer marginal, 12- bumen gland. Communication to latter 16. Central teeth trapezoidal; basal cusps achieved by short duct emerging from sper- small, central cusps only slightly enlarged. mathecal duct (Dsd, Fig. 2f) slightly anterior Lateral teeth with enlarged, hoe-like central to point where oviduct joins seminal recep- cusps (Fig. 4b). Stomach slightly longer than tacle duct. This unique arrangement implies style sac. Posterior edge of stomach without that oocytes travel (anteriorly) a short dis- 732 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON Fig. 1. SEM micrographs of shells of Antroselates spiralis Hubricht, USNM 673527 (paratypes): a, (Shell height, 4.95 mm); b, Dorsal aspect, showing well-developed spiral lines (shell height, 3.12 mm); c, Apical whorls (bar = 0.43 (im); d, Protoconch (bar = 176 iim). tance through the spermethecal duct before large stones in running water" (Hubricht entering duct to albumen gland. Spermathe- 1963:139). The species was not found by cal duct (Sd) fairly wide, pressed against the senior author during a 1987 trip to the capsule gland. Spermathecal duct entering Mammoth Cave area. anterior capsule gland; genital aperture (Ga) simple, terminal. Antrobia Hubricht, 1971 Distribution.—Found in a few caves and Antrobia Hubricht, 1971:95. Type species, springs in vicinity of Mammoth Cave Na- Antrobia culveri Hubricht 1971, by tional Park, Kentucky, as well as in a cave monotypy and original designation. stream in adjacent Indiana (Fig. 5; Hubricht 1963). Snails "found on the undersides of Diagnosis.— Shell small, low conical, VOLUME 101, NUMBER 4 733 1.0 mm 1.0 mm Jnc Epc Fig. 2. Morphology of Antroselates spiralis Hubricht, UF 40624: a, Dorsal view of operculum; b, Dorsal view of male (head-foot removed); c, Dorsal view of head and penis; d, Right lateral view of prostate gland; e, Left lateral view of pallial oviduct complex; f, Left lateral view of bursa copulatrix, seminal receptacle (rotated to expose underlying structures), and associated ducts. Only the anterior portion of the albumen gland is shown. Ag = albumen gland; Avd = anterior vas deferens; Bu = bursa copulatrix; Cg = capsule gland; Dbu = duct from bursa copulatrix; Dg = digestive gland; Dov = duct connecting oviduct and spermathecal duct; Epc = posterior end of pallial cavity; Ga = genital aperture; In = intestine; Jnc = juncture between anterior vas deferens and "neck"; Ov = oviduct; Pr = prostate gland; Pvd = posterior vas deferens; Sd = spermathecal duct; Sr = seminal receptacle; Sts = style sac; Ts = testis. 734 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON Fig. 3. SEM micrographs of critical point dried penes of Antroselates spiralis Hubricht, UF 40624 (a-c) and Antrobia culveri Hubricht, LH coll. (d): a, Dorsal view of penis (bar = 37 ^m); b, Close-up of striated surface (bar =213 fim); c, Close-up of penial tip, showing simple terminal opening (bar = 25 /um); d, Dorsal view of penis showing
Load more

Recommended publications
  • • Systematic Revision of the Hydrobiidae (Gastropoda: Rissoacea)
    MALACOLOGIA, 1985, 26(1-2): 31-123 • SYSTEMATIC REVISION OF THE HYDROBIIDAE (GASTROPODA: RISSOACEA) . OF THE CUATRO CIENEGAS BASIN, COAHUILA, MEXICO Robert Hershlerl Edwards Aquifer Research and Data Center, Southwest Texas State University, San Marcos, TX 78666, U.S.A. ABSTRACT This study gives detailed morphological descriptions, including aspects of shell and soft-part anatomy, for 12 species of nine genera of hydrobiid snails (Gastropoda: Rissoacea) from the isolated desert spring system of Cuatro Cienegas, Coahuila, Mexico. Snails were collected from 103 localities in the basin and summaries of the distribution and ecology for each species are given. One new genus and three new species are described. The six nominal species of Mexipyrgus are reduced to one variable species, Mexipyrgus churinceanus, as there are no suites of morphological features that can consistently define separate taxa when a large number of populations is studied. A multivariate morphological analysis of Mexipyrgus churinceanus, involving 20 morphological characters from 33 pop- ulations in the basin, shows that the trends of variation only partly follow the distribution of populations among the drainage systems of the basin. Contrary to previous thought, there are no subfamilies of hydrobiids endemic to the Cuatro Cienegas basin; all taxa studied belong to either the Nymphophilinae or Littoridininae, widely distributed subfamilies. Five genera and at least nine species are endemic to the basin. Phenetic and phyletic analyses show that of the five endemic genera, three are more closely related to nonendemic genera found in the basin than to each other, suggesting a polyphyletic origin for the endemic snails. The endemic snails may also be of a more recent and local origin than once thought.
    [Show full text]
  • The Freshwater Snails (Mollusca: Gastropoda) of Mexico: Updated Checklist, Endemicity Hotspots, Threats and Conservation Status
    Revista Mexicana de Biodiversidad Revista Mexicana de Biodiversidad 91 (2020): e912909 Taxonomy and systematics The freshwater snails (Mollusca: Gastropoda) of Mexico: updated checklist, endemicity hotspots, threats and conservation status Los caracoles dulceacuícolas (Mollusca: Gastropoda) de México: listado actualizado, hotspots de endemicidad, amenazas y estado de conservación Alexander Czaja a, *, Iris Gabriela Meza-Sánchez a, José Luis Estrada-Rodríguez a, Ulises Romero-Méndez a, Jorge Sáenz-Mata a, Verónica Ávila-Rodríguez a, Jorge Luis Becerra-López a, Josué Raymundo Estrada-Arellano a, Gabriel Fernando Cardoza-Martínez a, David Ramiro Aguillón-Gutiérrez a, Diana Gabriela Cordero-Torres a, Alan P. Covich b a Facultad de Ciencias Biológicas, Universidad Juárez del Estado de Durango, Av.Universidad s/n, Fraccionamiento Filadelfia, 35010 Gómez Palacio, Durango, Mexico b Institute of Ecology, Odum School of Ecology, University of Georgia, 140 East Green Street, Athens, GA 30602-2202, USA *Corresponding author: [email protected] (A. Czaja) Received: 14 April 2019; accepted: 6 November 2019 Abstract We present an updated checklist of native Mexican freshwater gastropods with data on their general distribution, hotspots of endemicity, threats, and for the first time, their estimated conservation status. The list contains 193 species, representing 13 families and 61 genera. Of these, 103 species (53.4%) and 12 genera are endemic to Mexico, and 75 species are considered local endemics because of their restricted distribution to very small areas. Using NatureServe Ranking, 9 species (4.7%) are considered possibly or presumably extinct, 40 (20.7%) are critically imperiled, 30 (15.5%) are imperiled, 15 (7.8%) are vulnerable and only 64 (33.2%) are currently stable.
    [Show full text]
  • Molluscs from the Miocene Pebas Formation of Peruvian and Colombian Amazonia
    Molluscs from the Miocene Pebas Formation of Peruvian and Colombian Amazonia F.P. Wesselingh, with contributions by L.C. Anderson & D. Kadolsky Wesselingh, F.P. Molluscs from the Miocene Pebas Formation of Peruvian and Colombian Amazonia. Scripta Geologica, 133: 19-290, 363 fi gs., 1 table, Leiden, November 2006. Frank P. Wesselingh, Nationaal Natuurhistorisch Museum, Postbus 9517, 2300 RA Leiden, The Nether- lands and Biology Department, University of Turku, Turku SF20014, Finland (wesselingh@naturalis. nnm.nl); Lauri C. Anderson, Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803, U.S.A. ([email protected]); D. Kadolsky, 66, Heathhurst Road, Sanderstead, South Croydon, Surrey CR2 OBA, England ([email protected]). Key words – Mollusca, systematics, Pebas Formation, Miocene, western Amazonia. The mollusc fauna of the Miocene Pebas Formation of Peruvian and Colombian Amazonia contains at least 158 mollusc species, 73 of which are introduced as new; 13 are described in open nomenclature. Four genera are introduced (the cochliopid genera Feliconcha and Glabertryonia, and the corbulid genera Pachy- rotunda and Concentricavalva) and a nomen novum is introduced for one genus (Longosoma). A neotype is designated for Liosoma glabra Conrad, 1874a. The Pebas fauna is taxonomically dominated by two fami- lies, viz. the Cochliopidae (86 species; 54%) and Corbulidae (23 species; 15%). The fauna can be character- ised as aquatic (155 species; 98%), endemic (114 species; 72%) and extinct (only four species are extant). Many of the families represented by a few species in the Pebas fauna include important ecological groups, such as indicators of marine infl uence (e.g., Nassariidae, one species), terrestrial settings (e.g., Acavidae, one species) and stagnant to marginally agitated freshwaters (e.g., Planorbidae, four species).
    [Show full text]
  • Phylogenetic Relationships of the Cochliopinae (Rissooidea: Hydrobiidae): an Enigmatic Group of Aquatic Gastropods Hsiu-Ping Liu,* Robert Hershler,†,1 and Fred G
    Molecular Phylogenetics and Evolution Vol. 21, No. 1, October, pp. 17–25, 2001 doi:10.1006/mpev.2001.0988, available online at http://www.idealibrary.com on Phylogenetic Relationships of the Cochliopinae (Rissooidea: Hydrobiidae): An Enigmatic Group of Aquatic Gastropods Hsiu-Ping Liu,* Robert Hershler,†,1 and Fred G. Thompson‡ *Department of Biology, Southwest Missouri State University, 901 South National Avenue, Springfield, Missouri 65804-0095; †Department of Systematic Biology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560-0118; and ‡Florida Museum of Natural History, University of Florida, Gainesville, Florida 32611-7800 Received July 24, 2000; revised March 27, 2001 shler, 1993) have not been well tested as there is no Phylogenetic analysis based on a partial sequence of rigorously proposed analysis of relationships that in- the mitochondrial cytochrome c oxidase subunit I cludes more than a trivial sampling of this large group gene was performed for 26 representatives of the (e.g., Altaba, 1993; Ponder et al., 1993; Ponder, 1999). aquatic gastropod subfamily Cochliopinae, 6 addi- Phylogenetic reconstructions of these animals have tional members of the family Hydrobiidae, and out- been hampered by a paucity of apparent synapomor- group species of the families Rissoidae and Pomatiop- phies (Thompson, 1984), putatively extensive ho- sidae. Maximum-parsimony analysis yielded a single moplasy (Davis, 1988; Hershler and Thompson, 1992), shortest tree which resolved two monophyletic and difficulties in reconciling homology (Hershler and groups: (1) a clade containing all cochliopine taxa with Ponder, 1998). Whereas a recent survey and reassess- the exception of Antroselates and (2) a clade composed of Antroselates and the hydrobiid genus Amnicola.
    [Show full text]
  • Macroflora Y Macrofauna De Los Sistemas Estuarinos De Michoacán, México Registrado Para Michoacán Y No Regulado En El País
    M acroflora y macrofauna de los sistemas estuarinos de Michoacán, México Andrea Raz-Guzmán Posgrado en Ciencias del Mar y Limnología. UNAM Resumen Los sistemas estuarinos michoacanos han sido estudiados escasamente. Por esto se muestrearon 22 sistemas para registrar la macroflora y macrofauna, registros nuevos, especies bajo algún estatus, especies de importancia comercial y su distribución espacial. Las especies recolectadas y las registradas en la literatura sumaron 123 (29 plantas, 94 animales). Las familias mejor representadas fueron Cyperaceae, Palaemonidae, Gobiidae y Carangidae. Los registros nuevos incluyen 29 especies de plantas, 7 de insectos, 2 de crustáceos, 15 de moluscos y 3 de peces. Las especies bajo algún estatus son Rhizophora mangle , Avicennia germinans , Conocarpus erectus , Laguncularia racemosa y Poecilia butleri . Phragmites australis , Typha domingensis , Macrobrachium hobbsi y M. tenellum presentaron las distribuciones más amplias. Los sistemas con más especies fueron Santa Ana, Salinas del Padre, Nexpa y Coahuayana. Diez especies de plantas y Stramonita biserialis son ornamentales. Los coleópteros, hemípteros y odonatos son depredadores de larvas de mosquitos y, junto con Macrobrachium digueti , son bioindicadores de la calidad del agua. Litopenaeus vannamei , M. americanum y 19 especies de peces sostienen pesquerías importantes, mientras que Callinectes arcuatus , C. toxotes y Cardisoma crassum se comercializan localmente. Melanoides tuberculata es introducido, oportunista, hospedero de tremátodos parásitos, no Ciencia Nicolaita # 76 46 Abril de 2019 Macroflora y macrofauna de los sistemas estuarinos de Michoacán, México registrado para Michoacán y no regulado en el país. La riqueza de especies estuarinas en Michoacán es marcadamente baja en respuesta a sus lagunas y esteros pequeños y oligo-mesohalinos y la resultante heterogeneidad ambiental baja, así como al reducido número de estudios enfocados específicamente a los sistemas estuarinos.
    [Show full text]
  • A Primer to Freshwater Gastropod Identification
    Freshwater Mollusk Conservation Society Freshwater Gastropod Identification Workshop “Showing your Shells” A Primer to Freshwater Gastropod Identification Editors Kathryn E. Perez, Stephanie A. Clark and Charles Lydeard University of Alabama, Tuscaloosa, Alabama 15-18 March 2004 Acknowledgments We must begin by acknowledging Dr. Jack Burch of the Museum of Zoology, University of Michigan. The vast majority of the information contained within this workbook is directly attributed to his extraordinary contributions in malacology spanning nearly a half century. His exceptional breadth of knowledge of mollusks has enabled him to synthesize and provide priceless volumes of not only freshwater, but terrestrial mollusks, as well. A feat few, if any malacologist could accomplish today. Dr. Burch is also very generous with his time and work. Shell images Shell images unless otherwise noted are drawn primarily from Burch’s forthcoming volume North American Freshwater Snails and are copyright protected (©Society for Experimental & Descriptive Malacology). 2 Table of Contents Acknowledgments...........................................................................................................2 Shell images....................................................................................................................2 Table of Contents............................................................................................................3 General anatomy and terms .............................................................................................4
    [Show full text]
  • American Fisheries Society • JUNE 2013
    VOL 38 NO 6 FisheriesAmerican Fisheries Society • www.fisheries.org JUNE 2013 All Things Aquaculture Habitat Connections Hobnobbing Boondoggles? Freshwater Gastropod Status Assessment Effects of Anthropogenic Chemicals 03632415(2013)38(6) Biology and Management of Inland Striped Bass and Hybrid Striped Bass James S. Bulak, Charles C. Coutant, and James A. Rice, editors The book provides a first-ever, comprehensive overview of the biology and management of striped bass and hybrid striped bass in the inland waters of the United States. The book’s 34 chapters are divided into nine major sections: History, Habitat, Growth and Condition, Population and Harvest Evaluation, Stocking Evaluations, Natural Reproduction, Harvest Regulations, Conflicts, and Economics. A concluding chapter discusses challenges and opportunities currently facing these fisheries. This compendium will serve as a single source reference for those who manage or are interested in inland striped bass or hybrid striped bass fisheries. Fishery managers and students will benefit from this up-to-date overview of priority topics and techniques. Serious anglers will benefit from the extensive information on the biology and behavior of these popular sport fishes. 588 pages, index, hardcover List price: $79.00 AFS Member price: $55.00 Item Number: 540.80C Published May 2013 TO ORDER: Online: fisheries.org/ bookstore American Fisheries Society c/o Books International P.O. Box 605 Herndon, VA 20172 Phone: 703-661-1570 Fax: 703-996-1010 Fisheries VOL 38 NO 6 JUNE 2013 Contents COLUMNS President’s Hook 245 Scientific Meetings are Essential If our society considers student participation in our major meetings as a high priority, why are federal and state agen- cies inhibiting attendance by their fisheries professionals at these very same meetings, deeming them non-essential? A colony of the federally threatened Tulotoma attached to the John Boreman—AFS President underside of a small boulder from lower Choccolocco Creek, 262 Talladega County, Alabama.
    [Show full text]
  • Hydrological Reconstruction of Extinct, Thermal Spring Systems Using Hydrobiid Snail Paleoecology
    Hydrological Reconstruction of Extinct, Thermal Spring Systems Using Hydrobiid Snail Paleoecology A thesis submitted to the faculty of San Francisco State University In partial fulfillment of The requirements for The degree Master of Science In Geosciences: Applied Geosciences By Zita Maliga San Francisco, CA May, 2004 Copyright by Zita Maliga 2004 CERTIFICATION OF APPROVAL I certify that I have read Hydrological Reconstruction of Extinct, Thermal Spring Systems Using Hydrobiid Snail Paleoecology by Zita Maliga, and that in my opinion this work meets the criteria for approving a thesis submitted in partial fulfillment of the requirements for the degree: Master of Science in Applied Geosciences at San Francisco State University. ___________________________________ Lisa White Professor of Geoscience ____________________________________ Karen Grove Professor of Geoscience ____________________________________ Peter Roopnarine Adjunct Professor of Biology ____________________________________ Carol Tang Adjunct Professor of Geoscience Hydrological Reconstruction of Extinct, Thermal Spring Systems Using Hydrobiid Snail Paleoecology Zita Maliga San Francisco State University 2004 In the thermal spring deposit of the extinct Garabatal hydrologic system in Cuatro Cienegas (Mexico), gastropod shell distribution was found to be clustered and preserved substrate preference patterns observed in the living system. A facies map of depositional habitats was created and gastropod distribution was visualized using Geographic Information Systems maps. From this, a hydrological flow model of the living system was reconstructed. A novel method of multivariate statistical analysis was also created and used to assess faunal associations. This method allowed us to assess the significance of associations in gradational and overlapping microhabitats, as well as to account for natural variations in species abundance. The taphonomy of subfossil gastropod shells was assessed using X-Ray Diffraction and Scanning Electron Microscopy.
    [Show full text]
  • The Hydrobiid Snails (Gastropoda: Rissoacea) of the Cuatro Cienegas Basin: Systematic Relationships and Ecology of a Unique Fauna
    ti THE HYDROBIID SNAILS (GASTROPODA: RISSOACEA) OF THE CUATRO CIENEGAS BASIN: SYSTEMATIC RELATIONSHIPS AND ECOLOGY OF A UNIQUE FAUNA ROBERT HERSHLER Edwards Aquifer Research and Data Center Southwest Texas State University San Marcos, Texas 78666-4615 ABSTRACT Results of the study of the morphology, systematics, and ecology of the Cuatro Ciēnegas hydrobiids are given. Contrary to previous thought, no subfamilies of hydrobiids are endemic to the basin: all taxa studied belong to either the Nympho- philinae or Littoridininae, subfamilies widespread throughout North America. Of the nine genera (five endemic) and 13 species (nine endemic) found while sampling a large portion of the basin drainage, one genus and three species are new (but will be described elsewhere), and two species are new to the basin. The six nominal species of Mexipyrgus are reduced to one, M. churinceanus. The diverse fauna is partitioned among three habitat types: species with large, thickened shells inhabit large springs and their outflows; minute, blind, unpigmented species are restricted to smaller groundwater outlets; and a third set of species inhabits smaller streams of the basin. Within large springs, micro-habitat partitioning occurs as separate species predominate either in soft sediment, on aquatic vegetation, or on travertine. At least one species reproduces year-round in the thermal waters of large springs. Phenetic and phyletic analyses show that three of five endemic genera closely resemble non-endemics found in the basin. The close similarity of endemics to non-endemics, lower level of endemism than once thought, lack of marked differentiation within the basin, and close proximity of the basin drainage to outside waters suggest a local and recent origin for the endemic taxa.
    [Show full text]
  • The Prosobranch Snail Family Hydrobiidae (Gastropoda: Rissooidea): Review of Classification and Supraspecific Taxa
    The Prosobranch Snail Family Hydrobiidae (Gastropoda: Rissooidea): Review of Classification and Supraspecific Taxa ALANR KABAT and ROBERT HERSHLE SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY • NUMBER 547 SERIES PUBLICATIONS OF THE SMITHSONIAN INSTITUTION Emphasis upon publication as a means of "diffusing knowledge" was expressed by the first Secretary of the Smithsonian. In his formal plan for the institution, Joseph Henry outlined a program that included the following statement: "It is proposed to publish a series of reports, giving an account of the new discoveries in science, and of the changes made from year to year in all branches of knowledge." This theme of basic research has been adhered to through the years by thousands of titles issued in series publications under the Smithsonian imprint, commencing with Smithsonian Contributions to Knowledge in 1848 and continuing with the following active series: Smithsonian Contributions to Anthropology Smithsonian Contributions to Botany Smithsonian Contributions to the Earth Sciences Smithsonian Contributions to the Marine Sciences Smithsonian Contributions to Paleobiology Smithsonian Contributions to Zoology Smithsonian FoUdife Studies Smithsonian Studies in Air and Space Smithsonian Studies in History and Technology In these series, the Institution publishes small papers and full-scale monographs that report the research and collections of its various museums and bureaux or of professional colleagues in the world o^ science and scholarship. The publications are distributed by mailing lists to libraries, universities, and similar institutions throughout the world. Papers or monographs submitted for series publication are received by the Smithsonian Institution Press, subject to its own review for format and style, only through departments of the various Smithsonian museums or bureaux, where the manuscripts are given substantive review.
    [Show full text]
  • 387 Freshwater Neritids (Mollusca: Gastropoda) Of
    Revue d’Ecologie (Terre et Vie), Vol. 70 (4), 2015 : 387-397 FRESHWATER NERITIDS (MOLLUSCA: GASTROPODA) OF TROPICAL ISLANDS: AMPHIDROMY AS A LIFE CYCLE, A REVIEW 1,2 1 2 Ahmed ABDOU , Philippe KEITH & René GALZIN 1 Sorbonne Universités - Muséum national d’Histoire naturelle, UMR BOREA MNHN – CNRS 7208 – IRD 207 – UPMC – UCBN, 57 rue Cuvier CP26, 75005 Paris, France. E-mails: [email protected] ; [email protected] 2 Laboratoire d'excellence Corail, USR 3278 CNRS-EPHE-UPVD, Centre de Recherches Insulaires et Observatoire de l'Environnement (CRIOBE), BP 1013 Papetoai - 98729 Moorea, French Polynésia. E-mail: [email protected] RÉSUMÉ.— L’amphidromie en tant que cycle de vie des Néritidés (Mollusca : Gastropoda) des eaux douces dans les îles tropicales, une revue.— Les eaux douces des îles tropicales abritent des mollusques de la famille des Neritidae, ayant un cycle de vie spécifique adapté à l’environnement insulaire. Les adultes se développent, se nourrissent et se reproduisent dans les rivières. Après l’éclosion, les larves dévalent vers la mer où elles passent un laps de temps variable selon les espèces. Ce cycle de vie est appelé amphidromie. Bien que cette famille soit la plus diversifiée des mollusques d’eau douce, le cycle biologique, les paramètres et les processus évolutifs qui conduisent à une telle diversité sont peu connus. Cet article fait le point sur l’état actuel des connaissances sur la reproduction, le recrutement, la migration vers l’amont et la dispersion. Les stratégies de gestion et de restauration pour la préservation des nérites amphidromes exigent de développer la recherche pour avoir une meilleure compréhension de leur cycle de vie.
    [Show full text]
  • Paleobioindicadores Lacustres Neotropicales
    El libro cuenta con once capítulos sobre los grupos de paleoindicadores biológicos (unicelulares, vegetales y zoológicos) más utilizados en reconstrucciones ambientales y climáticas, en los que se compila información detallada de cada uno de ellos, técnicas y PALEOBIOINDICADORES metodologías de trabajo, así como la presentación de diversos casos de estudio y P referencias bibliográficas actualizadas. Rápidamente el lector obtendrá un panorama de los ALEOBIOINDICADORES LACUSTRES NEOTROPICALES LACUSTRES distintos registros biológicos que se utilizan en la Paleolimnología Neotropical. Los dos primeros capítulos describen los bioindicadores unicelulares donde el lector NEOTROPICALES quedará fascinado con la gran cantidad de información que se puede obtener con tan pequeños organismos, posteriormente se presentan los capítulos relacionados con los paleobioindicadores vegetales como polen, fitolitos, pigmentos sedimentarios y material Editores carbonizado con los cuales se pueden realizar inferencias de cambios ambientales Liseth Pérez terrestres en la cuenca de estudio. Avanzando en los niveles de organización, se despliegan Julieta Massaferro los capítulos sobre los paleobiondicadores zoológicos (crustáceos, dípteros y moluscos) Alexander Correa-Metrio más utilizados dada su alta sensibilidad y preferencias ecológicas. Finalmente, con el objetivo de que el lector pueda comprender y posteriormente explorar con la práctica el campo y laboratorio de la paleolímnología se presenta un capítulo enfocado a los métodos estadísticos más utilizados en
    [Show full text]