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Issue: Vol. 23: 10 Jul. 2023
Type: Article
Published: 2023-07-10
DOI: 10.11646/zoosymposia.23.1.9
Page range: 52–77
Abstract views: 288
PDF downloaded: 252

New species of Lumbriculidae (Clitellata) from groundwater-dependent habitats in Texas

85060 Spencer Hollow Rd., Eugene, OR, 97405, USA
Edwards Aquifer Research and Data Center, Texas State University, 601 University Drive, San Marcos, Texas, 78666, USA
San Marcos Aquatic Resources Center, United States Fish and Wildlife Service, 500 East McCarty Lane, San Marcos, Texas, 78666
Edwards Aquifer Research and Data Center, and Department of Biology, Texas State University, 601 University Drive, San Marcos, Texas, 78666, USA
Texas Fish and Wildlife Conservation Office, United States Fish and Wildlife Service, 500 East McCarty Lane, San Marcos, Texas, 78666
North America oligochaetes new species biogeography taxonomy stygofauna karst groundwater

Abstract

Recent hyporheic, crenal and phreatic groundwater collections suggest a rich oligochaete fauna associated with the Edwards and Edwards-Trinity Aquifers in central Texas, including many species in the family Lumbriculidae. Based on limited invertebrate collections from earlier sampling programs, four sites were selected for more intensive oligochaete sampling. The lumbriculid Eclipidrilus palustris (Smith, 1900) is widespread in cleaner, cooler waters of the southeastern USA, and was common in crenal habitats. However, several lumbriculid species appear to be new and endemic, four of which are described here. Two of these can be assigned to the genus Eremidrilus Fend & Rodriguez, 2003 based on semiprosoporous male ducts with male pores in X, spermathecae in XI, and a filiform proboscis. Eremidrilus samacos n. sp. has typical morphology for the genus; E. parvitheca n. sp. (provisionally assigned to the genus) has duct-like spermathecae that join the gut, and unusual dorsal glands in posterior segments. Two morphotypes are assigned to E. parvitheca, based on spermathecal location in XI (typical) or XII (variant). A third species (Trichodrilus comalensis n. sp.) lacks a proboscis and has unusually elongated ventral chaetae. A problematic fourth species (Pararhynchelmis texana n. sp.) has semiprosoporous atria in X and duct-like spermathecae joining the gut in VIII. As it lacks apomorphies previously proposed for Rhynchelmis Hoffmeister, 1843 and Pseudorhynchelmis Hrabě, 1982, it is provisionally assigned to Pararhynchelmis Fend & Lenat, 2010.

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