Fluminicola fremonti, Hershler & Liu & Frest & Johannes, 2007

Hershler, Robert, Liu, Hsiu-Ping, Frest, Terrence J. & Johannes, Edward J., 2007, Extensive diversification of pebblesnails (Lithoglyphidae: Fluminicola) in the upper Sacramento River basin, northwestern USA, Zoological Journal of the Linnean Society 149 (3), pp. 371-422 : 386

publication ID

https://doi.org/ 10.1111/j.1096-3642.2007.00243.x

DOI

https://doi.org/10.5281/zenodo.5488422

persistent identifier

https://treatment.plazi.org/id/03BC4773-0B5A-F71D-40E1-FCEA1DE4F9C0

treatment provided by

Felipe

scientific name

Fluminicola fremonti
status

sp. nov.

FLUMINICOLA FREMONTI SP. NOV. (FREMONT

PEBBLESNAIL)

Type material: Holotype ( Fig. 8A View Figure 8 ), USNM 1020660 About USNM , Hunters Spring on the north side of FS28, Fremont National Forest , Lake County, Oregon (704840 E, 4684990 N, 1604 m), 26 August 2000 TF, EJ . Paratypes, USNM 1020661 About USNM , from same lot as holotype .

Referred material: USNM 1020662 About USNM , topotypes, 30 October 2002 , TF, EJ.

Diagnosis: Differs from closely similar F. turbiniformis in its smaller basal cusps on the central radular teeth, the typically pointed distal end of the penis, the presence of internal pigment in the penis, a more triangular-shaped bursa copulatrix, a longer bursa copulatrix duct, a larger seminal receptacle, and the absence of a seminal receptacle duct. Readily distinguished from geographically proximal F. modoci by its typically broader shell, narrower columellar lip, and lighter coloured periostracum.

Description: Shell ( Fig. 8A–E View Figure 8 ; Table 3) usually subglobose, rarely ovate-conic, rarely having eroded spire; height, 2.32–3.98 mm; whorls, 3.25–4.0. Protoconch 1.3–1.4 whorls, diameter approximately 0.70 mm. Teleoconch whorls medium convex, narrowly shouldered. Aperture broad, angled above. Parietal lip complete, usually adnate, thin and curved across body whorl; occasionally slightly disjunct, thickened. Columellar lip narrow to medium width, often overlapping part of umbilical region. Outer lip usually thin, prosocline. Shell anomphalous or having narrow umbilicus, umbilical region narrowly excavated. Periostracum tan or light brown. Outer surface of operculum smooth ( Fig. 8F View Figure 8 ). Central radular tooth approximately 37 µm wide, cutting edge convex, lateral cusps four to five; central cusp near parallel-sided, distal end rounded; basal cusps one; basal tongue broadly V- or U-shaped, equal to lateral margin ( Fig. 8H View Figure 8 ). Lateral tooth face broadly rectangular; central cusp rounded; lateral cusps three (inner), four to five (outer); outer wing flexed, medium length ( Fig. 8I View Figure 8 ). Inner marginal teeth ( Fig. 8G View Figure 8 ) having 27–33 cusps. Outer marginal teeth having 28–36 cusps; basal wing rectangular ( Fig. 8G, J View Figure 8 ). Head-foot dark brown, almost black. Ctenidium connected to pericardium by short, efferent branchial vessel (fide Hershler & Ponder, 1998: fig. 18c); ctenidial filaments approximately 16, weakly pleated. Osphradium elongate, positioned opposite middle of ctenidium. Female reproductive anatomy shown in Figure 6A View Figure 6 . Bursa copulatrix longitudinal, triangular, duct medium length. Seminal receptacle mediumsized, partly overlapped by albumen gland. Albumen gland having moderate rectal furrow. Capsule gland a little longer than albumen gland. Genital aperture a simple pore. Penis medium-sized, coiled, distal end usually pointed, rarely tapering or having papilla ( Fig. 7A View Figure 7 ). Penis surface pale; internal black granules scattered along length of penial duct. Penial duct near centrally positioned, weakly undulating medially.

Distribution: Known only from the type locality, which is located in the Thomas Creek drainage, Goose Lake basin ( Fig. 9 View Figure 9 ).

Etymology: Named after John C. Frémont, intrepid early explorer of the American West. The single locality for this species is located in the Fremont National Forest.

Remarks: On the basis of sequence divergence data, F. fremonti is most similar to species living in the lower Pit River basin: F. anserinus (described below) ( COI 3.5–3.8%) and F. scopulinus (described below) (cytb 5.5–5.8%).

TF

Department of Mineral Resources

EJ

Ein Yabrud collection catalogue entries at The Hebrew University

COI

University of Coimbra Botany Department

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