Planche 1 Issued from : R.B.S. Sewell in Rec. Indian Mus., 1912, 7. [Pl.XVI, figs.1-9]. As Acrocalanus inermis.
Female (from Bay of Bengal): 1, habitus (lateral right side); 2, P1; 3, P2; 4, A1.
Head and 1st thoracic segment separate, 4th and 5th separate. The posterior margin of the thorax is rounded and bears a row of small spines. Abdomen 4-segmented, contained 3 times in the length of the cephalothorax. Proportional lengths of urosomites and furca as 24:14:11:18:12. Caudal rami symmetrical and bear 4 terminal setae. A1 23-segmented (segments 2 fused, 8-9 partially fused) reach to the end of the caudal rami; each or the first six segments bears a transverse row of very small delicate spines. Endopodite (7-segmented) and exopodite nearly equal length. P5 practically absent, being only represented by short rounded unsegmented processes.

Male: 5, A1; 6, A2; 7, Md (masticatory edge); 8, P5; 9, P5 immature.
Abdomen 5-segmented. Proportional lengths of urosomites and furca as 5:8:6:6:6:5. A1 19-segmented (segments 1-6 and 7-8 fused). A2 differ from those of the female in that the last segment of the exopodite ends in a stump devoid of bristhes.. P5 only present on the left side.

Planche 2 issued from : S.Y. Moon, W. Lee & H.Y. Soh in Proc. Biol. Soc. Washington, 2010, 123 (1). [p.44, Table 1].
Presence and number of spinules on the anterior surface of the exopods and endopods of swimming legs 2 - 4 from (Sewell, 1912).
These characteristics were taken from Ali & al. (2007).