Two new genera and four new species of freshwater cochliopid gastropods (Rissooidea) from northeastern Mexico

2011/01/20 by Robert Hershler, H.-P. Liu, J. J. Landye · 3 citations
Agricultural and Biological Sciences · Environmental Science · #Aquatic Invertebrate Ecology and Behavior #Biology #Clade #Evolutionary biology #Freshwater macroinvertebrate diversity and ecology #Gastropoda #Genetic divergence #Genetic diversity #Genus #Lineage (genetic) #Mollusks and Parasites Studies #Phylogenetic tree #Population #Sister group #Zoology

paper · pdf · doi:10.1093/mollus/eyq033

openalex publication_date 2011/01/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/23

Abstract

We describe four new species of cochliopid snails from thermal springs in northeastern Mexico (Chihuahua, Coahuila and Durango States). Two of these are placed in Pseudotryonia and represent the first Mexican records for this genus. They are diagnosed by unique or unique combinations of shell and anatomical characters, are well differentiated genetically from both each other and other congeners (mtCOI sequence divergence ≥2.0%) and were resolved as sister species within the Pseudotryonia clade in our molecular phylogenetic analyses. The other two species resemble Ipnobius, Pseudotryonia and Tryonia in having a thin, narrow shell, penis ornamented with a small number of glandular papillae and ovoviviparous reproductive mode, but are well differentiated (from these and each other) by other morphological/anatomical characters and mtCOI sequences (8.6–12.5% and 5.2–12.1% divergence, respectively) and consequently are placed in new monotypic genera (Chorrobius and Minckleyella). Chorrobius and Minckleyella formed a clade with Ipnobius, Mexipyrgus and Tryonia in all of our molecular phylogenetic analyses. Chorrobius was consistently delineated as a divergent lineage within this clade, but its relationships were otherwise unresolved. Minckleyella was nested within Tryonia in most of the trees and was sister to this genus in the others; despite this finding we erected a new genus for this snail because of its highly distinctive anatomical features and large genetic divergence relative to Tryonia (5.2 ± 0.6%). Each of the four new species is endemic to highly disturbed single springs or local spring systems and may require protection.

Citations

• Table 1 in A new Gammarus species from Xinjiang Uygur Autonomous Region (China) with a key to Xinjiang freshwater gammarids (Crustacea, Amphipoda, Gammaridae)
• A New Genus And Species Of Aquatic Gastropods (Rissooidea : Hydrobiidae) From The North American Southwest : Phylogenetic Relationships And Biogeography
• Extensive diversification of pebblesnails (Lithoglyphidae:Fluminicola) in the upper Sacramento River basin, northwestern USA
• Phylogenetic Relationships of the Cochliopinae (Rissooidea: Hydrobiidae): An Enigmatic Group of Aquatic Gastropods
• The neighbor-joining method: a new method for reconstructing phylogenetic trees.
• Phylogenetic relationships of North American nymphophiline gastropods based on mitochondrial DNA sequences

Cited by

• Cochliopidae [wikipedia]
• Minckleyella [wikipedia]
• Wendell L. Minckley [wikipedia]

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• The Lesser Families of Mexican Terrestrial Molluscs*
• A New Genus And Species Of Aquatic Gastropods (Rissooidea : Hydrobiidae) From The North American Southwest : Phylogenetic Relationships And Biogeography
• Redescription of Marstonia comalensis (Pilsbry & Ferriss, 1906), a poorly known and possibly threatened freshwater gastropod from the Edwards Plateau region (Texas)