Crossotonotus spinipes (De Man, 1888 )

Clark, Paul F., Fujita, Yoshihisa, Ball, Alexander D. & Ng, Peter K. L., 2012, The first zoeal stage morphology of Crossotonotus spinipes (De Man, 1888) and Pseudopalicus serripes (Alcock & Anderson, 1895), with implications for palicoid systematics (Crustacea: Brachyura: Palicoidea) *, Zootaxa 3367, pp. 191-203 : 193

Crossotonotus spinipes (De Man, 1888)

( Figs. 1, 3a–c, 4, 5, 7)

Carapace ( Fig. 1a–c): reticular pattern, densely setosed; dorsal spine relatively short; rostral spine minute; lateral spines absent; 1 pair of posterodorsal setae; ventral margin with 1 pulmose anterior seta; eyes sessile.

Antennule ( Fig. 1d): uniramous, endopod absent; exopod unsegmented with 3 (2 broad, 1 slender) terminal aesthetascs plus 2 terminal setae.

Antenna ( Fig. 1e): protopodal process distally bilaterally spinulate, approximately equal to rostral; endopod spine present; exopod absent.

Mandible: palp absent.

Maxillule ( Fig. 3a): epipod seta absent; coxal endite with 7 setae; basial endite with 5 setal processes and 2 small setal buds; endopod 2-segmented, proximal segment with 1 seta; distal segment with 6 (2 subterminal, 4 terminal) setae; exopod seta absent.

Maxilla ( Fig. 3b): coxal endite bilobed with 5+3 setae; basial endite bilobed with 5+4 setae; endopod not bilobed, with 8 (3 subterminal, 5 terminal) setae; exopod (scaphognathite) margin with 4 setae and 1 long stout distal process.

First maxilliped ( Fig. 4a): coxa without setae; basis with 9 setae arranged 2,2,2,3; endopod 5-segmented with 3,2,1,2,5 (1 subterminal, 4 terminal) setae respectively; exopod 2-segmented, distal segment with 4 long terminal plumose natatory setae.

Second maxilliped ( Fig. 4b): coxa without setae; basis with 4 setae arranged 1,1,1,1; endopod 3-segmented, with 1,1,5 (3 subterminal, 2 terminal) setae respectively; exopod 2-segmented, distal segment with 4 long terminal plumose natatory setae.

Third maxilliped ( Fig. 4c): biramous.

Pereiopods ( Fig. 4d): present, chela bilobed.

Abdomen ( Fig. 5a, b): 5 somites; somite 2 with 1 pair of dorsolateral processes directed anteriorly; somites 3 and 4 with 1 pair of dorsolateral processes directed ventrally; somites 1 and 2 each with rounded posterolateral processes; somites 3–5 each with progressively longer posterolateral spinous processes towards posterior; somite 1 without setae; somites 2–5 each with 1 pair of posterodorsal setae; pleopod buds absent.

Telson ( Figs. 3c, 5a, b): each fork relatively reduced in length, with 1 small lateral spine with a small spine; posterior margin with 3 pairs of stout spinulate setae and ventral medial protuberance.