Planche 1 issued from : E.L. Markhaseva & F.D. Ferrari in Zoosyst. Rossica, 1995 (1996), 4 (1). [p.64, Figs.1-6]. As Ryocalanus asymmetricus.
Female (from 13°23.9'N, 102°35'W): 1, habitus (lateral); 2, anterior part of prosome; 3, rostrum (ventral); 4-6, last segment of prosome and urosome (dorsal, left and right lateral, respectively).
All scale bars: 0.1 mm.

Nota : Prosome 4.9 times as long as urosome. Rostrum with 2 symmetrical points. Genital segment strongly asymmetrical, with large projection on the left, reaching the posterior border of 2nd urosomal segment (in dorsal view) . Caudal raus with 4 large apical setae, 1 small lateral and 1 inner seta.

Planche 2 issued from : E.L. Markhaseva & F.D. Ferrari in Zoosyst. Rossica, 1995 (1996), 4 (1). [p.65, Figs.7-13]. As Ryocalanus asymmetricus.
Female: 7, exopod of A2; 8, Mx2; 9, Mxp (syncoxa and basis only); 10, P1; 11, P2; 12, P3; 13, P4 (coxopodite, basipodite, endopodite 1 and exopodite).

Nota : A2 coxopodite with 1, basipodite with 2 setae, exopodite 1 with 1, exopodite 2 with 3 setae, exopodite 3-6 with 1 seta each, exopod 7 with 1 medial and 3 terminal setae ; endopodite 1 with 1 seta and spinules near its base. Md palp base with 2 setae (3 in R. admirabilis, endopodite 1 with 2 setae (3 in R. admirabilis 2nd and 3rd Mx1 internal lobes with 6 and 4 setae, respectively ; basis plus endopod together have at least 21 setae ; exopod with 11 setae ; external lobe with 8 setae. Mx2 1st endite with 5 setae, 2nd to 5th endites with 3 setae each, 6th endite with 2 setae and terminal part with 5 setae.