Plate 1 issued from : O. Tanaka in Publs Seto Mar. Biol. Lab., 1964, XII (1). [p.63, Fig.204].
Female: a, habitus (dorsal); b, forehead (left lateral side); c, last thoracic segment and urosome (left lateral side); d, Md; e, Mx1; f, P1; g, exopod of P3; h, P5.

Nota: The urosome segments and furca are in the proportional lengths as 50:11:15:24 = 100. Sars' specimen from the North Atlantic has only 2 marginal spines on the 3rd segment of the exopod of P5, against 3 on the japan specimen.

Plate 2 issued from : J.M. Bradford-Grieve in The Marine Fauna of New Zealand: Pelagic Calanoid Copepoda. National Institute of Water and Atmospheric Research (NIWA). NIWA Biodiversity Memoir, 111, 1999. [p.50, Fig.22].
Female: A, habitus (dorsal); B, idem (lateral left side); C, Md (mandibular palp); D, Mx1; E, P1; F, P3; G, P5.

Plate 3 issued from : O. Tanaka & M. Omori in Publs Seto Mar. Biol. Lab., 1974, XXI (3/4). [p.208, Fig.7].
Female: a, forehead (lateral); b, last thoracic segment and urosome (lateral left side); c, Mx1; d, Mx2; e, P1; f, P4; g, P5.

Plate 4 issued from : O. Tanaka & M. Omori in Publs Seto Mar. Biol. Lab., 1974, XXI (3/4). [p.200, Fig.3,e].
Female: e, mandibular teeth.

Plate 5 issued from : G.D. Grice & K. Huisemann in Proc. U.S. natn. Mus., 1967, 122 (3583). [p.60, Figs.215-222; p.61, Figs.223-224]. As Euaugaptilus species 1. Doubtful.
Female (from 18°02'N, 65°08'E): 215, habitus (dorsal); 216, idem (lateral right side); 217, Md (mandible palp with basis of mandible blade); 218, Md (biting edge); 219, Mx1; 220, P3 (anterior); 221, 2nd and 3rd exopodal segments of P3 (posterior); 222, exopod of left P3 (external side); 223, basipodal segments of Mxp; 224, P5.

Nota: Head and 1st thoracic segment separate, 4th and 5th fused. Genital segment more than one-half the length of the urosome. Rostral filaments small and fine; A1 exceeds furca by last 5 segments. A2: Exopod 8-segmented. Md: palpus without rami. Mx1: 2nd inner lobe with 1 seta, 3rd inner lobe without seta, 1 seta on fused 2nd basal segment and endopod, 4 setae on exopod. Mx2: 2, 2, 2, 3, 2, 3 setae respectively on lobes 1-6. Mxp: indented knob on posterior side. Exopods and endopods of P1 to P4 3-segmented; 3rd exopodal segment of P3 cup shaped with 2 rudimentary spines on external margin and 5 setae on internal margin. P5 with 3-segmented exopods and endopods and with 1 small spine on the inner side of the 2nd exopodal segment.

Plate 6 Issued from : G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl. LXXXVI, figs.1-15].
Female: 1, habitus (dorsal); 2, idem (lateral left side); 3, forehead (lateral); 4, rostrum; 5, A2; 6, Md; 7, Mx1; 8, Mx2; 9, Mxp; 10, P1; 11, P2; 12, P3; 13, endopod of P4; 14, P5; 15, anal segment and caudal rami (dorsal).

Plate 7 issued from : R.N. Wolfenden in Die Marinen Copepoden der Deutschen Südpolar-Expedition 1901-1903, 1911. [p.344, Fig.75]. As Augaptilus facilis.
Female: a, posterior part cephalothorax and urosome (dorsal); b, Mx1.

Plate 8 issued from : R.N. Wolfenden in Die Marinen Copepoden der Deutschen Südpolar-Expedition 1901-1903, 1911. [Pl.XXXVIII, Figs.1-2]. As Augaptilus facilis.
Female: 1, P1; 2, P4.

Plate 9 issued from : G.P. Farran in Fish. Ire. Sci. Invest., 1906, II [1908]. [Pl. III, Figs.23-24]. As Augaptilus facilis.
Female (from 54°57'N, 10°51'W): 23, P4; 24, Mxp.

Plate 10 issued from : G.P. Farran in Fish. Ire. Sci. Invest., 1906, II [1908]. [Pl. VIII, Figs.1-6]. As Augaptilus facilis.
Female: habitus (dorsal); 2, A2; 3, Mx2; 4, P5: 5, Mx1; 6, Md (cutting edge).

Plate 11 issued from : J.M. Bradford-Grieve, E.L. Markhaseva & C.E.F. Rocha & B. Abiahy in South Atlantic Zooplankton, Edit. D. Boltovskoy. 1999. Vol.2. Copepoda. [p.1037, Fig. 7.248].
Female: Mx1.

Exopod of Mx1 with 3 setae; outer lobe 1 with 4 setae.

Plate 12 issued from : J.B.L. Matthews in Bull. Br. Mus. (Nat. Hist.) Zool., 1972, 24 (1). [p.20, Fig.9, A-C].
Male (from 28°07'N, 14°07'W): A, habitus (dorsal); B, Part of A1 showing geniculate joint; C, P5 (posterior view).
A: scale I; B-C: scale II.

Nota: Prosome length 2.9 times greatest width.
Head and thoracic segment 1 fused.
A1 exceeding the body by not more than the last 3 segments; There is some fusion of segments in the right-hand one [ on the left side in the keys of Bradford-Grieve & al., 1999 and Vives & Shmeleva, 2007] ) that it consists of only 22 free segments. The 18th segment opossesses the geniculate joint, which is a fairly simple structure. The only associated modifications are a spinose projection lying close to the segment just distal to the joint and a seta on each of the three preceding segments which has been shortened and strengthened into a spine.
A2 is a little stouter than shown by Sars (1924-1925) for the female, but is structurally identical.
Md: manduibular gnathobase identical to Sars' figure for the female, but the setae on the palp, of there is one fewer on the endopodite, are longer than the female's.
Mx1: identical to that of the female, except that it has a fourth well developed seta on the exopodite.
Mx2 and Mxp: identical to those of the female.
Swimming legs P1 to P4 resemble those of the female very closely. The number of spines on the exopodite of P1 reduced (as in the female), and the exopodites of P3 and P4 bear just the same swellings at the distal outer corner of the 2nd and 3rd segments (as characteristic of the female).
P5: On the right-hand limb the spiny projection at the tip is a little longer than the terminal spine (their position appears reversed in Fig.9C due to curling of the ramus in the mounted specimen).