Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Aetideidae ( Family )
            Aetideopsis ( Genus )
Aetideopsis retusa  Grice & Hulsemann, 1967   (F,M)
Grice & Hulsemann, 1967 (p.22, Descr.F, figs.F); Wheeler, 1970 (p.10, fig.F); Bradford & Jillett, 1980 (p.19); Markhaseva, 1996 (p.37, Descr.M, figs.F,M)
Species Aetideopsis retusa - Plate 1 of morphological figuresissued from : E.L. Markhaseva in Trudy Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.40, Fig.24].
Female; From different specimens; Gn: genital segment; RiP1: endopodite of first leg.
Ce, Th5 & Abd: from 44°25'N, 149°10'E; Gn: from 44°20'N, 150°33'E; other figures: from 45°43'N, 153°20'E.

Species Aetideopsis retusa - Plate 2 of morphological figuresissued from : E.L. Markhaseva in Trudy Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.41, Fig.25].
Female (from 45°43'N, 153°20'E) & Male (from 43°52'N, 149°49'E).
R: rostrum (anterior); P.md: mandibular palp

Species Aetideopsis retusa - Plate 3 of morphological figuresissued from : G.D. Grice & K. Huisemann in Proc. U.S. natn. Mus., 1967, 122 (3583). [p.49, Figs.39-45].
Female (from Indian Ocean): 39, habitus (dorsal); 40, idem (lateral right side); 41, A2; 42, Mx2; 43, Mxp; 44, P1; 45, P2 (terminal spine on exopod broken off).

Nota: Head and 1st thoracic segment incompletely separate, 4th and 5th separate.Rostrum distinct, rami separated by deep invagination. Frontal organ prominent and visible in dorsal view. A1 exceeds furca by last 2 segments.

Species Aetideopsis retusa - Plate 4 of morphological figuresIssued from : E.H. Wheeler, Jr in Smiths. Contr. Zool., 1970, 55. [p.20, Figs.29-30].
Female (from 37°12'N, 69°39W): 29, habitus (dorsal); 30, forehead (ventral view).

Species Aetideopsis retusa - Plate 5 of morphological figuresAetideopsis retusa 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 absent. 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 9 (8 terminal and 1 posterior) setae. A1 as long as or longer than body. Body length < 3.0 mm.

Species Aetideopsis retusa - Plate 6 of morphological figuresAetideopsis retusa male:
1 - Points of last thoracic segment exceeding posterior border of urosomal segment 1.
2 - Endopod of P1 with external lobe.
3 - Rostral rami spaced closely, slightly divergent.
4 - Genital segment no more than half shorter than urosomal segment 2. Body length < 3.0 mm.

Compl. Ref.:
C.-Y. Lee & al., 2009 (p.151, Tab.2)
NZ: 5

Distribution map of Aetideopsis retusa by geographical zones
Species Aetideopsis retusa - Distribution map 2
Chart of 1996
NW Sargasso Sea (in Wheeler, 1970), SW Indian, NW Taiwan, Kuril-Kamchatka & Aleutian Trenchs.

Type locality: 10°07'S, 64°27'E.
N: 5
(37) F: 2,8-1,96; M: 2,7-2,25; (67) F: 1,96; (203) F: 2,25; {F: 1,96-2,80; M: 2,25-2,70}
Rem.: bathy & abyssopelagic.
Last update : 07/01/2020
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2021. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed February 24, 2021]

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