Plate 1 Issued from : A. Scott in The Copepoda of the Siboga Expedition Part I. Siboga-Expeditie XXIX a., 1909. [Pl. LVII, Figs.7-8].
Female (from off Pulu Kawassang, Paternoster Islands): 7, habitus (dorsal); 8, P5.

Nota: Cephalic segment evenly rounded in the frontal portion and very slightly contracted at the distal end; it is slightly longer than the posterior part of the body.
Frontal margin very narrowly rounded and slightly cleft.
Abdomen 3-segmented.
Genital segment sub-quadrangular in shape and traversed by a distinct suture rather in front of the middle; its length equal to twice the combined length of the next two segments; it is rather shorter than the united length of the next two segments and caudal rami.
The 2nd and 3rd segments very short and nearly equal length.
Caudal rami 3 times longer than the anal segment; each ramus with 1 outer marginal seta and 5 apical setae.
A1 3-segmented, equal to one-third of the length of the cephalic segment.
P5 rather slender and distinctly bi-lobed. The inner lobe narrower than the outer lobe and does not extend beyond the end of it; apex with 1 seta; the outer lobe with 3 setae.

This species comes very near Monstrilla grandis in general appearance, and in the shape of P5. The chief difference is in the inner lobe of P5; Giesbrecht's figure shews the inner lobe of P5 M. grandis with 2 setae, instead 1 in the Siboga's specimens.

Plate 2 Issued from : E. Suarez-Morales in Cah. Biol. Mar., 2001, 42. [p.249, Figs.13-18].
Female (from Curaçao): 13, habitus (dorsal); 14, head (lateral); 15, right and left A1 (dorsal); 16, oral papilla (detail); 17, frontal keel-like process (detail); 18, last urosomite and caudal rami (dorsal).

Plate 3 Issued from : E. Suarez-Morales in Cah. Biol. Mar., 2001, 42. [p.250, Figs.19-26].
Female: 19, urosome (dorsal); 20, urosome (ventral); 21, same (lateral; setae omitted from P5); 22, P5 and bases of ovigerous spines (ventral); 23, P4 (posterior); 24, P2 (posterior); 25, P3 (anterior); 26, P5 showing complete setae.

Nota: P5 biramous, noticeably elongated, separated at base. Exopodal lobe 4.8 times longer than wide, lobe armed with 3 long setae, these slightly plumose (Curaçao) or naked (type specimens), subequal in length and breadth, 1.3-2.1 times longer than bearing lobe. Endopodal lobe slender, partially fused with exopodal lobe, shorter than it, with only 1 terminal, relatively short seta, almost of same length as exopodal lobe.

Plate 4 Issued from : E. Suarez-Morales in Cah. Biol. Mar., 2001, 42. [p.251, Figs.27-40].
Female (from Siboga RExpedition): 27, anterior ventral ornamentation of paralectotype; 28, same of lectotype; 29, same of peculiar paralectotype; 30, interantennular processes of lectotype (ventral); 31, same of peculiar paralectotype; 32, right A1 of lectotype (dorsal); 33, distal segment of exopod of P3, lectotype specimen; 34, same of P4; 35, outer basipodal seta of P1; 36, same of P3; 37, P5 of lectotype; 38, urosome of lectotype (lateral); 39, same of peculiar paralectotype; 40, right caudal ramus of lectotype (dorsal).

Plate 5 Issued from : E. Suarez-Morales in Cah. Biol. Mar., 2001, 42. [p.248].
Female: Armature formula of swimming legs P1-P4.