Fluminicola umpquaensis Hershler, Liu & Hubbart

Hershler, Robert, Liu, Hsiu-Ping & Hubbart, Niko, 2017, Two new species of Fluminicola (Caenogastropoda, Lithoglyphidae) from southwest Oregon, USA, and a range extension for F. multifarius, ZooKeys 679, pp. 1-20 : 11-13

Fluminicola umpquaensis Hershler, Liu & Hubbart sp. n. Figs 4 H–I, 6

Fluminicola virens .- Pilsbry 1899: 122-123 (in part). Henderson 1929: 169 (in part). Burch and Tottenham 1980: 102 (in part).

Types.

Holotype, USNM 1144535, Umpqua River at Bunch Bar Access (County), west of OR38 (Umpqua Highway), Douglas County, Oregon, 43.6462°N, 123.6670°W, 9/27/1998, Terrence J. Frest and Edward J. Johannes. Paratypes, USNM 1422224 (a large series of dry shells and alcohol-preserved specimens), from same lot.

Referred material.

OREGON. Jackson County. USNM 1296909, Umpqua River at Bunch Bar Access, USNM 1296910, Umpqua River at Umpqua County Landing upriver of Sutherlin-Umpqua Road Bridge (Douglas County 9) on east side, north of the mouth of Calapooya Creek, opposite of the town of Umpqua, RM 102.7 (43.3661°N, 123.4677°W), USNM 1296911, east side of Umpqua River at Cleveland Rapids, Cleveland Rapids Park, opposite and northeast of Cleveland (43.2966°N, 123.4705°W), USNM 1144361, USNM 126912, east side of North Umpqua River near boat ramp on west side of Whistlers Bend County Park (43.3101°N, 123.2168°W), USNM 1297138, bedrock shelf and bar on west side of North Umpqua River, ca. 0.48 km southwest of mouth of Swamp Creek (43.3015°N, 122.8692°W), USNM 1297139, Myrtle Creek just upstream of OR99 (Myrtle Creek Highway) bridge (43.0237°N, 123.2890°W), USNM 1297140, Elk Creek just below confluence of Drew Creek (42.8907°N, 122.9227°W), USNM 1144544, USNM 1297141, Elk Creek just south of bridge of Callahan Creek Road (FS3230), west and below Tiller Trail Highway (Douglas Co. 1, OR227) (42.8973°N, 122.9308°W), USNM 1144751, Pass Creek at site of Comstock in Pass Creek County Park, west side of I-5 off exit 164 (43.7186°N, 123.2076°W), USNM 1144360, USNM 1144656, south side of North Umpqua River at John P. Amacher Park, under and down river of railroad bridge west of I-5 and Winchester (43.2796°N, 123.3557°W), USNM 1144726, west side of North Umpqua River at and 0.32 km upstream of Chris Hestness Landing (43.2843°N, 123.1674°W), USNM 1144730, Umpqua River at Umpqua County Landing upriver of Sutherlin-Umpqua Road Bridge (Douglas County 9) on east side, north of the mouth of Calapooya Creek, opposite of Umpqua (43.3643°N, 123.4665°W), USNM 1144736, east side of Umpqua River at Cleveland Rapids, Cleveland Rapids Park, opposite and northeast of Cleveland (43.2972°N, 123.4686°W), USNM 1144748, Myrtle Creek just upstream of OR99 (Myrtle Creek Highway) bridge (43.0220°N, 123.2871°W), USNM 1144371, USNM 1144948, west side of South Umpqua River, east of I-5 and north of OR99 (Myrtle Creek Highway) Bridge, west of town of Myrtle Creek (43.0238°N, 123.2954°W), USNM 1144372, South Myrtle Creek, ca. 2.82 km from junction with North Myrtle Creek, below Days Creek Road (43.0176°N, 123.2666°W), USNM 1144473, north side of South Umpqua River just upstream (east) of mouth of Dumont Creek at Dumont Creek Campground (43.0337°N, 122.8010°W), USNM 1144545, Umpqua River on south side, Scottsburg County Park boat ramp (upstream side), southwest of Scottsburg (43.6480°N, 123.8377°W), USNM 1144546, USNM 1144995, Cow Creek at mouth of Salt Creek, west of Cow Creek Road (Douglas Co. 39), east of Byers (42.9240°N, 123.4897°W), BellMNH uncat., North Umpqua River at fish traps above Ideyld (43.3220°N, 123.0248°W), BellMNH uncat., North Umpqua River, Glide (43.302°N, 123.101°W), BellMNH uncat., forks of Umpqua River below Roseburg, BellMNH uncat., North Umpqua River at Winchester (43.282°N, 123.355°W), BellMNH uncat., North Umpqua River near Glide, BellMNH uncat., South Umpqua River near Canyonsville, BellMNH uncat., Umpqua River, Basket Point, BellMNH uncat., Umpqua River, Elkton (43.635°N, 123.570°W).

Diagnosis.

A large Fluminicola (maximum shell height, 9.5 mm) having a conical shell with eroded spire and a broad, little tapered penis. Differs from closely related F. gustafsoni and F. virens in its reniform-shaped bursa copulatrix and in its mtDNA sequences. Further differentiated from F. gustafsoni by its more elongate shell, longer outer wing of the lateral radular teeth, and smaller seminal receptacle; and from F. virens by its more convex shell whorls and longer bursal duct.

Description.

Shell (Fig. 6 A–C) conical, spire usually eroded, whorls>3.5. Teleoconch whorls medium convex, narrowly shouldered. Aperture ovate, slightly angled above; inner lip complete, thickened. Outer lip thin, prosocline. Umbilicus absent. Shell white, periostracum tan or olive. Shell measurements and whorl count data are summarized in Table 2.

Operculum (Fig. 6 D–E) as for genus; inner side smooth. Radula (Fig. 6 F–H) as for genus; dorsal edge of central teeth concave, lateral cusps four–five, basal cusp two–four. Lateral teeth having three–six cusps on inner side and four–six cusps on outer side; length of outer wing 180-200% length of cutting edge. Inner marginal teeth with 13-18 cusps, outer marginal teeth with 11-17 cusps. Radula data are from USNM 1422224.

Head-foot rather lightly pigmented, cephalic tentacles with central brown longitudinal stripe along length. Pallial roof, visceral coil dark brown, almost black. Penis having dense core of internal black pigment along penial duct. Ctenidial filaments 34-36 (N = 5), lateral surfaces ridged. Glandular oviduct and associated structures shown in Figure 4 H–I. Coiled oviduct vertical or posterior-oblique, proximal arm kinked. Bursa copulatrix medium-sized, reniform, largely overlapped by albumen gland. Bursal duct about twice as long as bursa copulatrix, very narrow. Seminal receptacle small, sac-like, completely overlapped by albumen gland. Albumen gland having short pallial component. Capsule gland slightly shorter than albumen gland, composed of two glandular zones. Genital aperture a small, sub-terminal pore. Penis (Fig. 4J) large, straight, broad, little tapered, distally rounded, deeply folded along most of length. Penial duct near centrally positioned, rather wide, undulating along entire length, opening through small terminal papilla.

Etymology.

The species name is an adjectival geographic epithet referring to the distribution of this pebblesnail in the Umpqua River basin.

Distribution.

Fluminicola umpquaensis is widely ranging in the Umpqua River basin, and is distributed in riverine habitats as well as springs and streams.

Remarks.

As mentioned above, the smaller of the two divergent Fluminicola clades (containing F. gustafsoni and F. virens ) was previously confined to the Columbia River basin ( Hershler and Liu 2012). Fluminicola umpquaensis extends the geographic range of this lineage>200 km southward from the lower Columbia River. Eight COI haplotypes and 11 cytB haplotypes were detected in the sequenced specimens of F. umpquaensis (Suppl. material 2-3, respectively).

Populations identified herein as F. umpquaensis were referred to as the Jade pebblesnail by Frest and Johannes (2000:182). We propose that this common name continue to be applied to this species.