Two new species of Fluminicola (Caenogastropoda, Lithoglyphidae) from southwest Oregon, USA, and a range extension for F. multifarius

Abstract

We describe two new species of pebblesnails (Lithoglyphidae: Fluminicola) from southwest Oregon based on morphologic and mitochondrial DNA (COI, cytB) evidence. Fluminicola umpquaensis sp. n., which had been traditionally identified as F. virens prior to the recent restriction of the latter to the lower Columbia River drainage, lives in lotic habitats in the Umpqua River basin. This species is readily distinguished from closely related F. gustafsoni and F. virens by shell and anatomical characters, and by its mtDNA sequences (divergence >3.6% for both genes). Fluminicola fresti sp. n. ranges among lotic habitats in the North Umpqua River basin, and in the upper Rogue River drainage north of Little Butte Creek. This species differs from other congeners by >9.1% for both genes and is distinguished from closely similar and geographically proximal F. multifarius by several anatomical characters. Additionally, new records are provided for F. multifarius from the upper Rogue River basin south of Little Butte Creek, which extend the geographic range of this species about 80 km northward from the Sacramento River headwater region. This continues a recent series of taxonomic papers on the poorly known and little studied pebblesnail fauna of the vast Pacific watershed from northern California to southern British Columbia.

A new species and range extensions for three other species of pebblesnails (Lithoglyphidae, Fluminicola) from the upper Klamath basin, California–Oregon

“…This is the fifth in a recent series of papers on the freshwater pebblesnails (Lithoglyphidae: Fluminicola ) of the Pacific Northwest, USA. The previous contributions in this series, which treated the faunas in the Rogue–Umpqua (Hershler et al 2017), upper Sacramento River (Hershler et al 2007), and Snake River watersheds (Hershler and Liu 2012; Liu et al 2013), increased the number of Fluminicola species from 9 to 27 and also documented large range extensions for F.coloradoense Morrison, 1940 and F.multifarius Hershler, Liu, Frest & Johannes, 2007.…”

“… Fluminicola fresti –Hershler et al 2017: 10–14, figs 4E–G, 5 (Diversion from Big Butte Springs through Butte Falls Hatchery, just south of Butte Falls–Fish Lake Road (Jackson County 321) and 0.16 km west of Butte Falls–Prospect Road (Jackson County 922), Jackson County, Oregon, 42.5389N, 122.5551W).…”

“…North Fork Umpqua River drainage and Rogue River basin north of Little Butte Creek, Oregon (Hershler et al 2017).…”

“…Sacramento River headwater region, upper reaches of the McCloud and Rogue River drainages, California–Oregon (Hershler et al 2007; Hershler et al 2017).…”

“…Herein we utilize both molecular (mitochondrial DNA sequences) and morphological data to delimit the UKL pebblesnail species. The former has proved very useful in previous taxonomic studies of pebblesnails, enabling delineation of both morphologically cryptic, and morphologically variable species (Hershler et al 2007, 2017; Liu et al 2013).…”