Scyltarus nearctus Holthuis 



Figure 76 



Scyllarus nearctus Holthuis, 1960b, p. 151. 



Scyllarus arctus paradoxus: Rathbun, 1900b (in part), p. 309. 



Recognition characters. — Carapace with sur- 

 face squamose in part dorsally, but only on or 

 near ridges and sides, smooth below except a 

 sinuous submarginal row of tubercles and a 

 lightly granulate area posteriorly, densely ciliate 

 above between squames and on smooth areas. 

 Rostrum short and acute; pregastric tooth above 

 it about same size, gastric tooth larger, acute, all 

 three of these directed forward. Cardiac eminence 

 blunt, bilobed at apex. Gastric tooth and cardiac 

 eminence with squames at base, rostrum and 

 pregastric tooth in smooth area. Lateral ridges 

 ending anteriorly in a forwardly directed spine. 

 Front emarginate with a small projection about 

 halfway between rostrum and orbit. Orbits 

 deeply excavated, upper border composed of two 

 spines coalesced at base, lower border an inflated 

 ridge more or less interrupted by two subequal 

 spines at anterolateral corner; anterior notch 

 partially occupied in middle by a large serrulate 

 tooth on first (fused) antennular article and an- 

 other eminence forming articulation of second 

 antennal article. Anterolateral corners of cara- 

 pace drawn out to a strong spine, lateral border 

 with a notch behind eye and another less definite 

 notch behind anterior end of branchial ridge. 

 Posterior margin of carapace with a sharp but 

 broadly opened notch in midline; area between 

 posterior marginal groove and posterior margin 

 of carapace traversed by two rows of squames. 



Anterior border of first antennular article with 

 low teeth or irregularities; second article cylin- 

 drical with a flattened, rounded distal projection ; 

 succeeding articles slender, flagella short. Anten- 

 nae spatulate, fairly smooth, ciliated, edges 

 densely covered with longer feathered setae ; distal 

 article semielliptical in outline, edge broken into 

 six well-separated lobes with narrowly rounded 

 tips, inner lobe smallest, outer broadest and sub- 

 truncate, a suggestion of a seventh lobe medially; 

 penultimate article short, irregularly spined and 

 lobed; first movable article roughly triangular 

 with apex formed by a strong spine, two spines 

 on outer border and three spines on inner border, 

 apical spine and first two inner spines with small 

 spurs on medial borders, third spine at medio- 



posterior border smaller, a definite ridge running 

 across article from articulation to apex. 



Second to fifth abdominal segments (and to 

 some extent first) with arborescent furrows run- 

 ning inward and forward toward midline. First 

 to fourth segments with median notch in posterior 

 margin deep and narrow. Third and fourth with 

 distal edge of pleura rounded anteroventrally, 

 angled at posteroventral corner; fifth broadly 

 rounded distally; sixth with anteroventral lobe 

 broad and rounded. Telson with four flattened 

 spines at distal edge of hard portion. Each ramus 

 of uropods with a spine at same level on outer 

 margin. 



Figure 76. — ScijHarm nearctus Holthuis. Male paratype 

 in dorsal view, approximately X 1.5. Bob Simpson 

 photo. 



MARINE DECAPOD CRUSTACEANS OF THE CAROLJNAS 



97 



