Subfamily Pinnothereliinae 



( Jarapace transverse, usually broadly so. Ischium 

 of external maxilliped usually distinct from 

 merus, though smaller and sometimes imperfectly 

 united with it. Merus longitudinal or somewhat 

 oblique; palp of good size, sometimes as large as 

 merus-ischium (Rathbun, 1918b). 



Genus Pinnixa White, 1846 



Rathbun, 1918b, p. 128. — Hemming, 1958b, p. 35. 



KEY TO SPECIES IN THE CAROLINAS 



a. Posterior part of carapace with conspicuous, sharp, 

 transverse ridge extending uninterruptedly from side 



to side cristata (p. 210). 



aa. Posterior part of carapace without ridge, or with 

 ridge on cardiac region only. 

 b. Chela with immovable finger bent downward. 



c. Propodus of third walking leg less than twice as 



long as wide chaetopterana (p. 210). 



cc. Propodus of third walking leg slender, twice or 



more than twice as long as wide sayana (p. 212). 



bb. Chela with immovable finger straight or nearly so, 

 not bent downward. 



c. No cardiac ridge present retincns (p. 212). 



cc. With cardiac ridge present. 



d. Merus of third walking leg with posterior sur- 

 face not deeply cupped out cylindrica ( p. 213) . 



dd. Merus of third walking leg with posterior sur- 

 face deeply cupped out lunzi (p. 214). 



Pinnixa cristata Rathbun 



Figure 193 



Pinnixa cristata Rathbun, 1900a, p. 589. — 1918b, p. 134, text- 

 fig. 78, pi. 29, figs. 8-9 (rev.).— Hay and Shore, 1918, p. 446, 

 pi. 36, fig. 5. 



Recognition characters. — Carapace short, sur- 

 face punctate, wrinkled, and microscopically 

 granulate, slightly pubescent at extreme outer 

 corners; a high, sharp, almost straight ridge 

 extending without a break entirely across cara- 



L93. -Pinnitta cristata Rathbun. Male in dorsal 

 view, legs of left side not shown, 2 mm. indicated. 



pace somewhat in front of posterior border; a 

 deep furrow behind gastric region. Anterolateral 

 margin with a raised crest stopping short of hepa- 

 tic region ; posterior margin wide, concave. Front 

 deflexed, not advanced. Orbit no wider than half 

 of front. 



Chelipeds rather stout ; palm oblong with upper 

 and lower margins convex, surface covered with 

 reticulate pattern of fine granulations; immovable 

 finger short, deflexed, gripping edge with a trun- 

 cate subbasal tooth, another small tooth distally 

 forming a truncate tip ; dactyl long, gaping, with 

 inner margin bent in a curved right, angle. Walk- 

 ing legs somewhat longer than in related species, 

 sparsely hairy along margins only, third walking 

 leg strongest ; dactyls slender, slightly curved on 

 first three, straight on last walking leg. 



Measurements. — Carapace : female, length, 4 

 mm.; width, 11 mm. 



Type locality. — Beaufort, N.C. 



Known range. — Beaufort, N.C, to Edisto Is- 

 land, S.C. ; Grand Isle, La., to Long Lake, Black- 

 jack Peninsula, Aransas County, Tex. (Hedg- 

 peth, 1950, and U.S. National Museum records). 



Remarks. — The species has been taken from 

 sandy beaches by digging or sifting in North 

 Carolina and South Carolina, and Louisiana, and 

 from the mouth of Galeichthys felis in Louisiana. 



Pinnixa chaetopterana Stimpson 



Figure 194 



Pinnixa chaetopterana Stimpson, 1860a, p. 235. — Rathbun, 

 1918b, p. 151, text-figs. 93-94, pi. 33, figs. 3-6 (rev.). — Hay and 

 Shore, 1918, p. 445, pi. 36, fig. 4. 



Recognition characters. — Carapace transversely 

 oval, somewhat more than twice as wide as long, 

 more swollen in female than in male, surface un- 

 even, sides densely pubescent. Regions well de- 

 fined by pubescent grooves; cardiac region with 

 an acute transverse crest broadly interrupted in 

 middle forming two dentiform prominences, more 

 conspicuous in male than in female; subbranchial 

 region advanced, forming a prominent shoulder 

 with granulated edge. Posterior margin concave. 

 Front narrow, with a deep median groove. 



Chelipeds stout, smooth, pubescent. Hand in 

 male with distal palmar edge perpendicular; im- 

 movable finger short, deflected, truncate at tip, 

 with a prominent rounded tooth on cutting edge; 

 dactyl strongly curved, almost vertical, forming 



210 



FISH AND WILDLIFE SERVICE 



