Article thumbnail

Redescription of Marstonia comalensis (Pilsbry & Ferriss, 1906), a poorly known and possibly threatened freshwater gastropod from the Edwards Plateau region (Texas)

By Robert Hershler and Hsiu-Ping Liu

Abstract

Marstonia comalensis, a poorly known nymphophiline gastropod (originally described from Comal Creek, Texas) that has often been confused with Cincinnatia integra, is re-described and the generic placement of this species, which was recently allocated to Marstonia based on unpublished evidence, is confirmed by anatomical study. Marstonia comalensis is a large congener having an ovate-conic, openly umbilicate shell and penis having a short filament and oblique, squarish lobe bearing a narrow gland along its distal edge. It is well differentiated morphologically from congeners having similar shells and penes and is also genetically divergent relative to those congeners that have been sequenced (mtCOI divergence 3.0–8.5%). A Bayesian analysis of a small COI dataset resolved Marstonia comalensis in a poorly supported sub-clade together with Marstonia hershleri, Marstonia lustrica and Marstonia pachyta. The predominantly new records presented herein indicate that Marstonia comalensis was historically distributed in the upper portions of the Brazos, Colorado, Guadalupe and Nueces River basins, south-central Texas. The species has been live collected at only 12 localities and only two of these have been re-visited since 1993. These data suggest that the conservation status of this snail, which has a critically imperiled (G1) NatureServe ranking and was recently proposed for federal listing, needs to be re-assessed

Topics: Article
Publisher: Pensoft Publishers
OAI identifier: oai:pubmedcentral.nih.gov:3088054
Provided by: PubMed Central

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.

Suggested articles

Citations

  1. (1995). A new freshwater snail from the Coosa River, Alabama (Gastropoda: Prosobranchia: Hydrobiidae).
  2. (2007). A petition to list all critically imperiled or imperiled species in the southwest United States as threatened or endangered under the Endangered Species Act, 16 U.S.C. §§ 1531 et seq. Forest Guardians,
  3. (1969). A protandrous haploporid cercaria, probably the larva of Saccocoelioides sogandaresi Lumsden,
  4. (1994). A review of the North American freshwater snail genus Pyrgulopsis. Smithsonian Contributions to Zoology 554:
  5. (1998). A systematic review of the hydrobiid snails (Gastropoda: Rissooidea) of the Great Basin, western United States. Part I. Genus Pyrgulopsis.
  6. (1998). Abundance and distribution of the freshwater snail fauna in Comal SpringsLanda Lake,
  7. (2008). Ecological sustainability report
  8. EJ (2003b) Rissooidean snails from the Pit River basin,
  9. (2007). Extensive diversifi cation of pebblesnails (Lithoglyphidae: Fluminicola) in the upper Sacramento River basin, northwestern United States.
  10. (2008). Habitat infl uences snail community structure and trematode infection levels in a spring-fed river, Texas, USA. Hydrobiologia 600: 29–40.Robert Hershler & Hsiu-Ping Liu / ZooKeys 77: 1–16 (2011) 16 Turgeon
  11. (2004). http://www.natureserve.org/explorer [accessed 3.VI.2010] Nylander JAA
  12. (1975). Index and bibliography of late Cenozoic freshwater Mollusca of western North America.
  13. (1975). Investigation of fl ow requirements from Comal and San Marcos Springs to maintain associated aquatic ecosystems Guadalupe River basin.
  14. (2001). IUCN Red List Categories and Criteria: Version 3.1. IUCN Species Survival Commission.
  15. (1993). Karst aquatic ecosystems of the Edwards Plateau region of central Texas, USA: a consideration of their importance, threats to their existence, and eff orts for their conservation. Aquatic Conservation: Marine and Freshwater Ecosystems
  16. (2007). MEGA4: Molecular evolutionary genetics analysis (MEGA) software version 4.0.
  17. (2001). Molecular systematic of Hydrobiidae ( Mollusca: Gastropoda: Rissooidea): testing monophyly and phylogenetic relationships.
  18. (1906). Mollusca of the southwestern states.
  19. (2003). MRBAYES 3: Bayesian phylogenetic inference under mixed models.
  20. (2009). NatureServe Explorer: an online encyclopedia of life [web application].
  21. (1910). New Amnicolidae of the Panuco River system, Mexico. Nautilus 23: 97– 100, plate IX.
  22. (1980). North American freshwater snails. Species list, ranges and illustrations.
  23. (2010). Species profi le. Comal siltsnail (Marstonia comalensis). http://ecos.fws.gov/speciesProfi le/profi le/speciesProfi le.action?spcode=F04C [accessed 14.VI.2010] Walker B
  24. (2010). State Wildlife Action Plan (SWAP).
  25. (1978). Th e hydrobiid snail genus Marstonia.
  26. (2001). Th ompson FG
  27. Th ompson FG (2003a) Phylogenetic relationships of North American nymphophiline gastropods based on mitochondrial DNA sequences.
  28. (2002). Two genera of North American freshwater snails: Marstonia Baker,
  29. (2005). Two new species of hydrobiid snails of the genus Marstonia from Alabama and Georgia.
  30. (1964). Type land snails in the Academy of Natural Sciences of Philadelphia. Part III. Limnophile and thalassophile Pulmonata. Part IV. Land and fresh-water Prosobranchia.
  31. (2008). version. Cibola National Forest,