Plate 9 Issued from : W. Vervoort in Zool. Verh., Leiden, 1949, 5. [p.8, Fig.2]. As Aetideopsis trichechus. With doubt.
Female (Flores Sea): a, habitus (dorsal); b, idem (lateral left side).

Nota: The abdominal segments and furca in the proportional lengths 38:20:14:10:18 = 100.
The present species shows some resemblance with Aetideopsis divaricata Esterly, 1911, but the proeminent frontal part of the head seems to be absent in the latter species.

Plate 10 Issued from : W. Vervoort in Zool. Verh., Leiden, 1949, 5. [p.9, Fig.3]. As Aetideopsis trichechus. With doubt.
Female (Flores Sea): a, P1; b, P4.

Nota: P4 is different compared to P4 from Park (1978, p.121, Fig.12 D) and Markhaseva (1996, p.44, Fig.27)

Plate 11 Issued from : K.A. Brodskii in Calanoida of the Far Eastern Seas and Polar Basin of the USSR. Opred. Fauna SSSR, 1950, 35 (Israel Program for Scientific Translations, Jerusalem, 1967) [p.147, Fig.61].
Female (from Arctic): habitus (dorsal and lateral left side); R, rostrum; last thoracic segment and 1st and 2nd abdominal segments (dorsal); S1, P1; S3As, apical spine of P3; R (NP), rostrum (example from NW Pacific).
Nota: Head widened in middle; not fused with thorax. Boundary between 4th and 5th thorcic segments sometimes visible only at edges of carapace. Abdomen 2/7 length of cephalothorax. Genital segment slightly shorter than both following segments combined.Exopodite of A2 longer than endopodite by 1/6 its length. Outer spine of 1st exopodal segment of P1 not reaching middle of following spine.

Plate 12 issued frm : A. Scott in Siboga-Expedition, 1909, XIX a. [Plate V, Figs.13-24]. Doutful (perhaps Aetideopsis multiserrata).
Female (from Indonesia-Malaysia): 13, habitus (dorsal); 14, forehead (lateral); 15, last thoracic and genital segments (left side); 16, rostrum; 17, A1; 18, A2; 19, Md (biting blade); 20, Mx2; 21, Mxp; 22, P1; 23, P2; 24, P4.
Nota: The minor points of difference with the description and figures given by Sars are: the external margins of the rostrum are more concave, and the excavation between the rami is much narrower. A comparison of the North Atlantic specimens from the Faroë Channel with the specimens from the 'Siboga' does not reveaf difference.

Plate 13 issued from : C.O. Esterly in Univ. Calif. Publs Zool., 1911, 6 (14). [Pl.28, Figs.27, 29, 31, 32]. As Aetideopsis divaricata.
Female (from San Diego Region): 27, habitus (lateral); 29, forehead (lateral); 31, 4th and 5th thoracic segments and urosome (dorsal); 32, rostrum.
Nota: A1 24-segmented, extend back to about the middle of the urosome.

Plate 14 issued from : C.O. Esterly in Univ. Calif. Publs Zool., 1911, 6 (14). [Pl.31, Figs.88, 102]. As Aetideopsis divaricata.
Female: 88, P1; 102, basal part of the serrate margin of the terminal bristle of exopodite of P4.

Plate 15 issued from : C.-t. Shih & N. Stallard in Arctic, 1982, 35 (1). [p.57).
Male (from Lancaster Sound, N Baffin Island): a-b, lateral and dorsal, respectively); c, rostrum (frontal view); d, left A1; e, A2; f, Md; g, Mx1; h, Mx2; i, Mxp; j-n, P1 to P5.
Upper scale for a-b; lower scale for appendages.

Nota: A1 23-segmented (segments 8, 9 and 10 fused; incomplete segmentation between segments 9 and 10 barely visible), reaching nearly to posterir margin of 3rd metasomal segment. A2 similar to that of female. Md with degenerate gnathobase; exopod 5-segmented, slightly longer than endopod. Mx1 degenerate; 1st and 3rd inner lobes present, with 4 and 3 setae, respectively; 2nd inner lobe represented by an indistinct outgrowth; basis with 3, endopod with 4 and 5, and exopod with 9 setae; outer lobe with 2 setae. Mx2 very much reduced in size and structure. Mxp similar, in general, to that of the female. P1 to P4 similar those of the female. P5 biramous and asymmetrical; right leg longer than left, exopod with first two segments fused, 3rd segment with a long a slightly curved terminal spine, endopod 1-segmented and reduced in size; left leg exopod 3-segmented.

Plate 16 issued from : C. With in The Danish Ingolf-Expedition, 1915, III (4). [p.87, Text-fig.22. As Aetidiopsis rostrata.
Female (65°34'N, 7°31'W): a, forehead (lateral); b, last thoracic segment and genital segment (lateral, left side); c, genital area (ventral); d, right P4 (posterior).

Plate 17 issued from : C. With in The Danish Ingolf-Expedition, 1915, III (4). [Pl. II, Figs.6a, 6b]. As Aetidiopsis rostrata.
Female: 6a, anterior portion of oral surface of labrum; 6b, lamina labialis (partly in anterior view).

Plate 18 Aetideopsis rostrata female:
1 - Endopod of P1 with external lobe.
2 - Posterior corners of last thoracic segment not wing-like, not divergent (dorsal view). Genital segment (dorsal view) barrel-like without lateral swellings.
3 - Crest present (faintly developed). 1st and 2nd external spines of exopod segments 1 and 2 of P1 exceeding base of next spine.
4 - Endopod of P2 2-segmented (though separartion between segments may be incomplete). Points of last thioracic segment reaching the midlength of geniral segment (or exceeding it).
5 - Anterior part of cephalon (lateral view) fairly smoothly transforming into rostrum, not prominent over base of rostrum.
6 -Rostrum well developed, rami not close-spaced slightly divergent.
7 -Proximal part of Mxp protopodite (externally) with well visible projection.
8 - Endopodal segment 2 of Md with 10 (8 terminal and 2 posterior) setae. A1 reaching the middle length, or end of urosomal segment 3. Body length > 3.0 mm.

Plate 19 Aetideopsis rostrata male:
1 - Points of last thoracic segment reaching or exceeding posterior border of urosomal segment 1.
2 - Endopod of P1 with external lobe.
2 - Rostral rami spaced closely.
3 - Rostral rami more or less divergent.
4 - Genital segment over half shorter than urosomal segment 2. Body length > 3.0 mm.