Cottus ohlone pomo Moyle and Campbell 2022. Pomo Riffle Sculpin, new subspecies

Description as for C. gulosus. Meristics of sculpins used in this study (Table 1, n = 21): anal-fin rays (12–14), dorsal spines (6–8), dorsal rays (15–19), dorsal fins joined? (variable), black spot on dorsal (yes), palatine teeth present (no), maxilla reaches eye (variable), chin pores (1–2), pelvic fins spines + rays (1+3), pelvic fins do not touch vent, pectoral -in rays (14–16), preopercular spines (2), lateral line complete, lateral line pores 27–35. Other characters are listed in Table 1.

Holotype. WFB 3396 90 mm SL, 105 mm TL from Pieta Creek, upstream of mouth on Russian River, Mendocino County, California, N 38.925278 W 123.054500. Collected by J. Baumsteiger and P. Moyle, August 2, 2017. 90 mm SL, 105 mm TL. Anal-fin rays 13; dorsal-fin spines 8; dorsal-fin rays 17; dorsal fins not joined; dorsal fin spot present; palatine teeth absent; maxilla reaches middle of eye; chin pores 2; pelvic fins 1 spine, 3 rays; pelvic fins do not touch vent; pectora1-fin rays 14; preopercular spines 1; lateral line incomplete; lateral line pores 31; axillary prickles present.

Paratypes. WFB 3397, 3398, 3399, 3400 from same location. 71–81 mm SL, 91–105 mm TL. Anal fin rays 13; dorsal fin spines 8; dorsal fin rays 17; dorsal fins not joined; dorsal fin spot variable in presence; palatine teeth absent; maxilla reaches middle of eye; 2 chin pores; pelvic fins 1 spine, 3 rays; pelvic fins do not touch vent; pectora1 fin rays 14–15; preopercular spines 1; lateral line completeness variable; lateral line pores, 25–30; axillary prickles present.

Diagnosis. Distinguished from other members of the C. gulosus complex as a distinct lineage as determined by genomics and by its distinctive distribution (Fig. 1).

Distribution. Present in the upper portions of the Russian River, above the mouth of Mark West Creek, including the East Fork, as well as in tributaries to northern San Francisco Bay, including the Napa River, Petaluma River, Sonoma Creek, and smaller tributaries (Fig. 3). These streams had connections in the past to the Russian River, via the shifting headwaters of Sonoma Creek.

Etymology: Ohlone honors the Ohlone people, as discussed in the names section for C. o. ohlone (see http:// www.muwekma.org/). Pomo honors the diverse native peoples who were once the principal human inhabitants of the Russian River region, which contains streams that are important habitat for Pomo Riffle Sculpin.