SUBTERRANEAN A]MPHIPOD STYGONECTES 117 



varying from 50 to 55 percent as long as body. Telson without 

 lateral spines. 



Stygonectes pecki, new species 



Figure 28 



Stygonectes species. — Reddell, 1965, p. 160 (in part). — Holsinger, 1966, p. 119 (in 



part) . 



Material examined 



Texas. — Comal Co.: spring in Landa Park (Comal Springs), new Braunfels, 

 female holotype, J. Reddell, May 18, 1965; female parat3T)e, S. Peck, June 18, 

 1964 (USNM). (Holotype, partially on slide mount.) 



Diagnosis. — Medium-sized subterranean species distinguished by 

 rather narrow bases of pereopods 5-7, which are somewhat broader 

 proximally than distally, relatively straight to slightly convex poste- 

 rior margins of abdominal side plates 1 and 2, proportionately shorter 

 outer ramus of uropod 1 which is only about 70 percent as long as 

 inner ramus, and by the rather stoutly buUt 3rd uropod which pos- 

 sesses 5 apical spines on the ramus. Further distinguished from S. 

 dejectus, to which it is most closely related, by the diagnosis given for 

 that species. Largest female, 10.50 mm; male unknown. 



Female (holotype) .—Antenna 1 between 55 and 60 percent as long 

 as body, about 50 percent longer than antenna 2; primary flagellum 

 with 31 segments; accessory flagellum extending to about the end of 

 2nd primary flagellar segment. Mandible well developed, molar 

 prominent; palpal segment 3 with 8 long setae; segment 2 with 10 

 setae. Maxilla 1, inner plate with 5 apical, plumose setae. Maxilla 

 2, inner plate with 6 long, obliquely placed, plumose setae. Maxil- 

 liped, inner plate with 5 thick, apical spines. Lower lip, inner 

 lobes small. 



Gnathopod 1 : propod palmar margin not especially oblique, 

 straight, armed with a double row of about 9 spine teeth; posterior 

 angle with 1 large spine and 4 smaller spines on outside; 6 small 

 spines on inside; posterior margin convex, with 4 sets of setae; lateral 

 setae mostly singly inserted. Gnathopod 2: propod about equal in 

 size to 1st but a little more slender; palmar margin generally straight, 

 armed with a double row of 10 spine teeth; posterior angle with 1 large 

 spine, 4 smaller spines and 2 long setae on outside, 5 small spines on 

 inside; posterior margin with 3 or 4 sets of setae; superior lateral 

 setae mostly doubly inserted, inferior lateral setae singly inserted. 

 Coxal plates of pereopods 2 and 3 about 20 percent longer than broad, 

 marginally with 3 spinules and 5 setae each. Coxal plate of pereopod 

 4 subquadrate, extending distally for about 1/2 the length of segment 

 2; ventral margin with 10 setae. Pereopod 7 about 50 percent as 

 long as body, about equal in length to pereopod 6 and 25 percent 



