A small species having no dorsal carina behind cervical groove. Cervical groove very strong, meeting anteriorly with transverse hepatic groove and running toward branchiostegal spine. Postorbital spine directed anteriorly; orbital and antennal spines small. Rostrum well developed so as to be a blade, its tip ending at a level of median part of cornea; upper margin with four to seven teeth, (usually six), and lower margin fringed with long soft hairs. Third to sixth abdominal segments with a dorsal carina.
Distribution:
West Atlantic from North Carolina through the Gulf of Mexico and the Caribbean Sea to southern Brazil, 18-223 m deep.
Remarks:
More than 50 specimens referable to S. geijskesi Holthuis, 1959, were collected at a station of 5°13′N, 51°30′W, 66 m deep, but they were unfortunately not preserved in good condition to produce the color photographs. It ranging from the Caribbean Sea to Brazil is distinguished from this species, in addition to the differences in the form of therycum and petasma, by having the longer rostrum (extending to level of tip of cornea) with seven or eight teeth on upper margin.