Sweltsa tamalpa (Ricker)

Stark, Bill P. & Baumann, Richard W., 2007, Sweltsa Yurok (Plecoptera: Chloroperlidae), A New Stonefly From California, U. S. A., Illiesia 3 (10), pp. 95-101 : 97-98

Sweltsa tamalpa (Ricker)

( Figs. 7-12 )

Alloperla (Sweltsa) tamalpa Ricker, 1952:182 . Holotype ♂ (Illinois Natural History Survey). Bootjack Camp, Mt. Tamalpais State Park , California.

Material examined. California: Marin Co., Woodacre, San Geronimo Valley Road , near junction Francis Drake Boulevard , 13 May 1983, R.W. Baumann, R.C. Mower, 23 ♂, 60 ♀ ( BYU). Marin Co., Muir Woods National Monument , 13 June 1980, S.M. Clark, 1 ♀ ( BYU). Mendocino Co., Dooley Creek, Hwy 175, E Hopland , 23 April 1987, R.W. Baumann, B.P. Stark, C.R. Nelson, S.A. Wells, 1 ♂, 3 ♀ ( BYU). Mendocino Co., seep 9 miles E Hopland, Hwy 75, 23 April 1987, R.W. Baumann, B.P. Stark, C.R. Nelson, S.A. Wells, 1 ♂ ( BYU). San Benito Co., West Fork Chalone Creek, Pinnacles National Monument , 10 May 1987, D. Giuliani, 5 ♂, 2 ♀ ( BYU). Sonoma Co., Copeland Creek, Fairfield Osborne Preserve , 13 April 1981, L.E. Serpa, 1 ♂ ( BYU).

Remarks. Ricker’s (1952) figures give the general impression of shape and relative length of the epiproct of this species but do not provide information on epiproct setation, and the egg has not previously been described. Consequently, we offer Figs. 7- 12 and the following comments to document these characters for S. tamalpa . The typical epiproct has a pointed, bare apex and a completely bare base ( Fig. 8 ). The apex is foot shaped in lateral aspect ( Fig. 9 ), but is not upturned at the “ankle” as in S. yurok . The egg lacks a collar and is coarsely pitted over most of the chorionic surface, but a small apical area is smooth ( Fig. 12 ).

Figures

Figs. 7-12. Sweltsa tamalpa (Woodacre, Marin Co., CA). 7. Male terminalia, dorsal aspect, 8. Epiproct, dorsal aspect, 9. Epiproct, lateral aspect, 10. Epiproct base, dorsal aspect, 11. Female abdominal sterna 8-9, 12. Egg.