Colour of holotype in alcohol pale brownish yellow, with a faint, dusky-edged, pale stripe, narrower than pupil, beginning above opercle and extending parallel to dorsal profile of postorbital head and nape to below rear half of first dorsal fin
; dorsal fins
with pale yellowish rays and faintly dusky membranes; remaining fins pale yellowish.
This group is easily identifiable due to the long dorsal fin
, which begin before the pelvic fin in males and the presence of two small black spots in the caudal peduncle of females.
It lives in shallow waters from Morocco to the English Channel and spends most of its time buried under the sea bed with only its eyes and venomous dorsal fin
poking out from the sand.
Caudal-fin base dark yellow, lobes hyaline; pectoral fin yellow with rays dark basally, pelvic fins hyaline, dorsal fin
with dark bands extending on to rays, more pronounced on the tips.
The dorsal fin
fold begins behind the brain area (Fig.
Body depth is the greatest depth to the base of the dorsal fin
(adjusting for any malformation of the abdomen due to preservation).
6 % of SL, calculated from photographs), taller first dorsal fin
, and longer soft dorsal and anal rays.
Based on examination of these genetically identified individuals, significant differences were found in body color, specifically spotting on the spinous dorsal fin
or an overall darker color (or both) in S.
The diacritically meristic counts were listed as follows: first dorsal fin
with a single small isolated spine anteriorly; gill rakers 2-3+4-6=6-9; pored lateral line scales 73-80 and caudal fin with a yellow marking on the middle when fresh.
This particular species of dolphin has a highly variable dorsal fin
shape which can sometimes be so tall and straight that they are mistaken for their larger relatives, the killer whale.
smooth dogfish and Florida/Gulf smoothhound) Predorsal ridge present; second dorsal fin
slightly smaller than first dorsal fin
and much larger than anal fin; max.
Anterior dorsal fin
has spines which are not separated from posterior one that has one spine and 13 fins rays .