Stygobromus conradi (Holsinger 1967)

Stygobromus conradi (Holsinger)

Stygonectes conradi Holsinger, 1967:40–42, fig. 8 [type-locality: Breathing Cave, Bath Co., Virginia]; 1969a:32–33; 1972:60.

Stygobromus conradi (Holsinger).—Karaman, 1974:109.—Holsinger, 1977:261; 1978.

MATERIAL EXAMINED.—VIRGINIA. Bath Co.: Butler-Sinking Creek Cave, 2 , J. R. Holsinger, L. V. Amundson, and T. Vigour, 2 Nov 1968.

DIAGNOSIS.—A medium-sized cavernicolous species distinguished from S. gracilipes, to which it is closely related, by the characters given in the above key and by the description of Holsinger (1967). Largest male (submature?), 4.3 mm; largest female, 8.2 mm.

DISTRIBUTION AND ECOLOGY.—This rare species is known only from two females and two males collected from Breathing and Butler-Sinking Creek caves, respectively. These caves are hydrologically integrated components of an extensive cavern system developed in Upper Silurian and Lower Devonian limestones of the upper James River drainage in northern Bath and southern Highland counties, Virginia (Holsinger, 1975a:23). The two males from Butler-Sinking Creek Cave were collected from under flat rocks in a stream also inhabited by isopods, Asellus (sensu lato) holsingeri, and snails, Fontigens orolibas Hubricht.

The spinosus Group

DIAGNOSIS.—Closely related to the emarginatus group but distinguished from that group as follows: Adult size range, 3.7–6.0 mm. Propod of gnathopod 1 a little larger than 2nd propod; defining angle with 2 or 3 long spine teeth of unequal length on outside. Lateral sternal gills simple. Posterior margins of pleonal plates with 3 to 6 setae each. Uronites usually free but sometimes partly fused. Telson subquadrate to subrectangular, usually a little longer than broad; apical margin entire, slightly convex.