Differs from S. horridus by:
-smaller size
-the absence of a transverse crest of spines on the 1st proximal segment (protopodite) of Mxp
Female:
Cephalothorax has an elongate oval shape from dorsal view, front end is rounded. From side view the back is arched, smoothly narrowed in the front and back. The back corners of the last thoracic segment widely rounded. 1st-4th thoracic segments with lateral spines on both sides; their number decreases toward the back of the body.
Abdomen 2.5-3 times shorter than the cephalothorax. The genital segment is almost as long as wide. The ventral side of 1st-3rd abdominal segment carries long hairs. Caudal rami symmetrical, 1.5 times longer than wide.
A1 somewhat longer than the body.
Mxp carries a transverse row of spines on the 2nd proximal segment.
Endopodite of P1 with 2 inner chaetae. The distal segment of the exopodite with 3-4 spines on the dorsal surface.
P2-P4 with 3-4 rows of spines near the outer edge. The 2nd segment of the endopodite of P2 and the 3rd segment of the exopodite carry 2 rows of spines on the dorsal surface; the 2nd segment of the exopodite – with one row.
P3-P4 armed in a similar way: the 2nd and 3rd segments of the endopodite carry 2 rows of long spines, the 3rd segment of the exopodite – 3 rows of spines. The 2nd segment of the exopodite carries proximally a diagonal row of long slightly flattened spines and a distal row of short spines.
Male:
The 1st segment of A1 carries a star-shaped group of spinules on the antero-dorsal surface. Segments 20 and 21 fused on left side, separate on right, segment 25 more or less reduced.
First segment of the exopodite of P1 with a very small distal outer spine. Endopodite of P1 with spinules.
Anal segment short.
