The species name is from the Latin flavus for yellow and lineatus, in reference to a line, for the most conspicuous colour marking, the yellow line passing from behind the eye to below the first dorsal fin
3 Meristics Dorsal fin
28 27-28 16 Caudal fin 25 24-25 24 Anal fin 21 20-21 16-18 Pelvic fin 5 5 5 Pectoral fin 12 11-12 11 Scales in longitudinal scries 25 25-26 26 Scales in transversal series 09 9-10 9 Horizontal scales around 12 12 10 Caudal peduncle
The spines along the dorsal fin
and gills are for protection against predators and are not used to catch food.
Secondary sexual dimorphism: Males with reduced hooks on rays of anal, pelvic, pectoral and dorsal fins
Dorsal rays XI, 9; anal rays III,9; dorsal and anal soft rays branched except first and second rays of dorsal fin
and first ray of anal fin; the last dorsal and anal soft rays branched to base; pectoral rays 15, the upper two unbranched; pelvic rays I,5; principal caudal rays 13, the upper and lower rays unbranched; upper and lower procurrent caudal rays 3 (3-4); lateral line 16 + 6 (16 + 6-9, except one paratype with 14 + 6); scales above lateral line to origin of dorsal fin
2; scales below lateral line to anus 7 (6-7); median predorsal scales 5; median preventral scales 6 (5-6); transverse scale rows on cheek 2, the upper row with 6 (5-8) and the lower row with 10 (9-10) scales; circumpeduncular scales 15; gill rakers 15 (14-17).
These fishes are generally similar in appearance and characterised by relatively high dorsal and anal fin ray counts, and a live colour pattern that features a dark submarginal stripe and outer white margin on the second dorsal fin
Dorsal-fin origin above anterodorsal portion of gill slit; dorsal fin
continuous, gradually increasing in height from spine I (4.
These individuals were characterized by: 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.
The Risso dolphin has a distinctive dorsal fin
Caption: First dorsal fin
originating Behind pectoral fins
The measurable morphometric characters used were standard length (SL), Body weight (BWT), Total Body Length (TL), Dorsal Fin
Length (DL) Caudal Fin Length (CL) Head Length (HL), Body width (BW).
was also bright red with blue spots on the foredorsal [sic] part.