Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Aetideidae ( Family )
            Aetideopsis ( Genus )
Aetideopsis antarctica  (Wolfenden, 1908)   (F,M)
Syn.: Faroella antarctica Wolfenden, 1908 (39, Descr.F, figs.F); 1911 (p.214);
Chiridius antarcticus : Farran, 1929 (p.208, 230, Rem.); Sewell, 1948 (p.574)
Bradford, 1971 b (p.18, Redescr.F, Descr.M, figs.F,M); Park, 1978 (p.115); Bradford & Jillett, 1980 (p.19); Razouls, 1994 (p.67, figs.F,M, Rem.); Park & Ferrari, 2009 (p.143, Table 3, Appendix 1, biogeography from Southern Ocean);
Species Aetideopsis antarctica - Plate 1 of morphological figuresFemale: 1, habitus (dorsal view); Issued from : Wolfenden R.N. in Natn. Antarct. Exped. 1901-1904, Nat. Hist., Zoology, 1908, 4,: 1-46. 2, Head (lateral; 3, Rostrum; Issued from : Bradford J. in N.Z. Jl mar. Freshw. Res., 1971, 5 (1): 12-40.
Male: 4, habitus (dorsal view); 5, Head (lateral); 6, Rostrum (oblique); 7, P5 (G: left; Dt: right); issued from Bradford, 1971.

Species Aetideopsis antarctica - Plate 2 of morphological figuresIssued from : J.M. Bradford in N.Z. Oceanogr. Inst., 1971, 206, Part 8, No 59. [p.18, Figs.41-43].
Female (from Ross Sea): 41, habitus (dorsal); 42, forehead (lateral); 43, rostrum.
Scale bar: 1 mm (41, 42); 100 µm (43).

Nota : All integument covered with blunt chitinous knobs except for anal segment and caudal rami.
head and 1st thoracic segment incompletely fused, thoracic segments 4 and 5 separate.
Posterior points of last thoracic segment reacjing 2/3 down genital segment
Urosomal segments 1-3 bordered by fine weak teeth.
A1 at right angles to body but not reaching past posterior border of 4th thoracic segment.
A2 exopod longer than endopod ;
Md like that of A. tumorosa with 2 setae on the 1st exopod segment and basis..
Mx1, Mx2 and Mxp like those in A. tumorosa and A. carinata.

Species Aetideopsis antarctica - Plate 3 of morphological figuresIssued from : J.M. Bradford in N.Z. Oceanogr. Inst., 1971, 206, Part 8, No 59. [p.19, Figs.44-48].
Female: 44, P1; 45, P2; 46, P3; 47, portion of terminal spine; 48, P4.
Scale bar: 1 mm, except 47 = 100 µm.

Nota : P1 external edge exopod spines on 1st and 2nd segments both reach past base of next spine. Endopod has patch of inner bristles on anterior surface besides spinules on external protuberance.
P2 endopod segments fused on posterior surface, but line of fusion visible on anterior surface. Distal part of endopod anterior surface with patch of very fine spinules (as noted by Wolfenden, 1908).1st and 2nd exopodal segments both with 1 glandular pore right on lateral margin just below external edge spine ; 49 teeth on terminal spine.
P3 and P4 with first two endopodal segments incompletely separated and with distal anterior patch of fine spinules. Glandular pores in same position on P2.
P3 with 51 teeth on terminal spine.
P4 with 45 teeth on terminal spine ; teeth tall narrow, curving towards spine apex.

Species Aetideopsis antarctica - Plate 4 of morphological figuresIssued from : J.M. Bradford in N.Z. Oceanogr. Inst., 1971, 206, Part 8, No 59. [p.18, Figs.31-40].
Male (Ice Harbour, McMurdo Sound): 31, habitus (dorsal); 32, forehead (lateral); 33, rostrum (oblique view); 34, Mx1; 35, P1; 36, P2; 37, portion of terminal spine of P4; 38, P3; 39, P4; 40, P5.
Scale bar: 1 mm (31, 32) ; 10 µm (37); 100 µm on the rest.

Nota : Integument covered, except for anal segment and caudal rami) with chitinous blunt knobs.
Head and 1st thoracic segment completely fused, segments 4 and 5 separate.
Posterior points of last thoracic segment directed backwards past 1st urosomal segment.
Rostrum much smaller than in female.
Genital aperture on left of genital segment.
Posterior borders urosomal segmentd 2-4 lined with small weak teeth ?
A1 24-segmenred, reaches hing border of 3rd thoracic segment
A2 exopod and endopod of equal length.
Md endopod with 2 setae (1 very small), basis with 1 seta. Mx2 and Mxp very reduced compared with that of female but like that of tumorosa and carinata.
Right P5 tip reaches tip of caudal rami ; form of this limb hardly different from any other known male Aetideopsis.

Species Aetideopsis antarctica - Plate 5 of morphological figuresIssued from : C. Razouls in Ann. Inst. océanogr., Paris, 1994, 70 (1). [p.67]. Caractéristiques morphologiques de Aetideopsis antarctica femelle et mâle adultes.
Terminologie et abbréviations: voir à Calanus propinquus.

Compl. Ref.:
Razouls & al., 2000 (p.343, tab. 2, 5, Appendix); Schnack-Schiel & al., 2008 (p.1045: Tab.2); Ojima & al., 2013 (p.1293, Table 2, 3)
NZ: 1

Distribution map of Aetideopsis antarctica by geographical zones
Antarct. (Peninsula, W Weddell Sea, Indian: coastal, Lützow-Holm Bay, Ross Sea, McMurdo Sound)
N: 9
(32) F: 4,3; (35) F: 4,8-4,41; (102) F: 4,6-4,4; M: 3,7; {F: 4,30-4,80; M: 3,70}
Rem.: Sampling depth (Antact.): 0-600-1000 m.
This species resembles A. minor (Wolfenden, 1911) which is smaller, with diverging rostral points and with urosome microspines less obvious.
Bradford (1971 b, p.19) emphasizes that A. antarctica and A. minor appear to be related, as both have chitinous ''prickles'' covering the integument and a distal anterior patch of spinules on the endopods. The main points of difference are the size and the less obvious ''prickles'' on the urosome and the diverging rostral points.
Last update : 24/01/2017
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2023. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed March 30, 2023]

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