Species Card of Copepod
Cyclopoida ( Order )
    Oncaeidae ( Family )
        Triconia ( Genus )
Triconia antarctica  (Heron, 1977)   (F,M)
Syn.: Oncaea conifera var. III Giesbrecht, 1902 (p.41, Pl.13, figs.7-11, Rem.);
O. conifera : Tanaka, 1960 (p.66, figs.F,M);
Oncaea antarctica Heron, 1977 (p.42, figs.F,M); Malt, 1983 (p.450, 458); Razouls, 1994 (p.186, figs.F,M); Heron & Bradford-Grieve, 1995 (p.15, figs.F,M); Metz, 1995 (p.190); 1996 (p.54, 87); Bradford-Grieve & al., 1999 (p.887, 970, figs.F,M);
Ref. compl.: Hopkins, 1985 (p.197, Table 1, gut contents); Hopkins & Torres, 1988 (tab.1); Atkinson & al., 1990 (tab.1); Freire & al., 1993 (tab.3); Bielecka & Zmijewska, 1997 (p.149, %, vertical distribution); Errhif & al., 1997 (p.422); Razouls & al., 2000 (p.343, tab. 3, 5, Appendix); Chiba & al., 2001 (p.95, tab.4, 7); Hunt & al., 2001 (p.374, tab.1); Cabal & al., 2002 (p.869, Table 1, abundance); Bielecka & Zmijewska, 2005 (p.96); Tsujimoto & al., 2006 (p.140, Table1); Deibel & Daly, 2007 (p.271, Table 6b, Rem.: Antarctic polynyas); Swadling & al., 2010 (p.887, Table 2, 3, A1, fig.6, abundance, indicator species); Ojima & al., 2013 (p.1293, fig.5, abundance, Rem.: p.1301); Lee D.B. & al., 2013 (p.1215, Table 1, 2, abundance, composition)
Böttger-Schnack, 1999 (p.43, Rem.)
Species Triconia antarctica - Plate 1 of morphological figuresissued from : G.A. Heron in Antarct. Res. Ser. Washington, 1977, 26. [p.43, Fig.2]. As
Oncaea antarctica.
female: a-b, habitus (dorsal and lateral; scale bar: X); c, urosome (dorsal; scale bar: Y); d, left A1 (scale bar: Y); e, left A2 (scale bar: Y); f, labrum (scale bar: Z); g, oral area (ventral; scale bar: Y); h, right Md (scale bar: Z); i, left Mx1 (scale bar: Z).

Species Triconia antarctica - Plate 2 of morphological figuresissued from : G.A. Heron in Antarct. Res. Ser. Washington, 1977, 26. [p.44, Fig.3]. As
Oncaea antarctica.
female: a, left Mx2 (scale bar: Z); b, left Mxp (scale bar: Y); c-f, P1 to P4 (scale bar: Y).

Species Triconia antarctica - Plate 3 of morphological figuresissued from : G.A. Heron in Antarct. Res. Ser. Washington, 1977, 26. [p.45, Table 5]. As
Oncaea antarctica.
Female and Male: armature of swimming legs.
Si = inner setae; St = terminal seta; Se = outer setae. Roman numeral: Spine; arabic numeral: seta.

Species Triconia antarctica - Plate 4 of morphological figuresissued from : G.A. Heron in Antarct. Res. Ser. Washington, 1977, 26. [p.46, Fig.4, a-f]. As Oncaea antractica.
Female: a, P5 (scale bar: Z); b, habitus female and male (lateral; scale bar: X).

Male: c, urosome (ventral; scale bar: Y); d, posterior of last prosomal segment and urosome (lateral; scale bar: Y); e, left Mxp (scale bar: Y); f, P5 (scale bar: Z).
Nota: P6 represented by posterolateral flap on ventral surface of genital segment; pointed posterior corner protruding laterally in dorsal view; minute, hyaline setule on subterminal ventral margin.

Species Triconia antarctica - Plate 5 of morphological figuresissued from : W. Giesbrecht in Copepoden. Res. voyage du S. Y. Belgica. Rapports scientifiques, Zoologie, 1902. [Taf. XIII, Figs. 7-11]. As Oncaea conifera.
Female (from Antactic): 7, urosome (dorsal); 8, habitus (lateral); 9, Mxp; 10, endopod of P4; 11, A2.

Species Triconia antarctica - Plate 6 of morphological figuresIssued from : O. Tanaka in Spec. Publs. Seto mar. biol. Lab., 10, 1960 [Pl. XXIX, 1-2]. As Oncaea conifera.
Female (from 66°59'S-67°04'S, 41°08'E-10°44'E): 1-2, habitus (dorsal and lateral, respectively).

Nota: Prosome and urosome in the proportional lengths 66 to 34.
The 2nd thoracic segment with a well-marked dorsal projection.
abfominal segments and caudal rami in the proportional lengths 55 : 9 : 7 : 12 : 17 = 100.
Genital segment swollen at the anterior 1/5 of the segment.
Cadal rami 4.35 times as long as wide.

Species Triconia antarctica - Plate 7 of morphological figuresIssued from : O. Tanaka in Spec. Publs. Seto mar. biol. Lab., 10, 1960 [Pl. XXIX, 3-8]. As Oncaea conifera.
Male (from 66°06'S-67°04'S, 44°10'E-40°44'E): 3, habitus (dorsal); 4, forehead (lateral); 5, last thoracic segments and abdomen (lateral); 6, P2; 7, P3; 8, endopod of P4.

Nota: Cephalothorax and abdomen in the proportional lengths 69 to 31.
Proportional lengths of the abdominal segments and caudal rami 66 : 3 : 1 : 1 : 13 : 16 = 100.
Genital segment about 1.6 times as long as wide (25 : 16); the process on the posterior lateral margin of the segment is very acute.
Caudal rami 2.4 times as long as wide.

Species Triconia antarctica - Plate 8 of morphological figuresIssued from : C. Razouls in Ann. Inst. océanogr., Paris, 1994, 70 (1). [p.186]. As Oncaea antarctica.Caractéristiques morphologiques de Triconia antarctica femelle et mâle adultes.
Terminologie et abbréviations: voir à Calanus propinquus.

NZ: 4

Distribution map of Triconia antarctica by geographical zones
Species Triconia antarctica - Distribution map 3Issued from : K.M. Swadling, So. Kawaguchi & G.W. Hosie in Deep-Sea Research II, 2010, 57. [p.898, Fig.6 (continued)].
Distribution of indicator species Oncaea antarctica (= Triconia antarctica) from the BROKE-West survey (southwest Indian Ocean) during January-February 2006.
Sampling with a RMT1 net (mesh aperture: 315 µm), oblque tow from the surface to 200 m.
The survey area was located predominantly within the seasonal ice zone, and in the month prior to the survey there was considerable ice coverage over the western section but none over the east.

See map showing sampling sites in Calanus propinquus.
Antarct. (Amundsen Sea, Peninsula, Croker Passage, Weddell Sea, SW Atlant., Indian, Lützow-Holm Bay, SW Pacif., McMurdo, Bellinshausen Sea), sub-Antarct. (off W Prince Edward, Indian, SW Pacif.), S Indian (subtropical convergence), Tasman Sea
N: 20
(33) F: 1,25-1,1; M: 0,65-0,6; (66) F: 1,27-1,17; M: 0,68-0,64; (679) F: 1,4-1,16; M: 0,7-0,64; (681) F: 1,26-1,15; M: 0,63-0,59; {F: 1,10-1,40; M: 0,59-0,70}
Rem.: epi-mesopelagic.
Sampling depth (Antarct., sub-Antarct.) : 0-1000-2000 m.
Tanaka (1960, p.67) underlines that Giesbrecht (1902) and Farran (1929) called attention to the short caudal rami and large genital segment found among the O. conifera specimens taken from the Antarctic (= Triconia antarctica), however for Tanaka the specimens from 66°S have rather a short genital segment and longer caudal rami.
Heron & Frost (2000, p.1017) do not agree that the generic definition of Triconia by Böttger-Schnack (1999) is sufficient to justify inclusion of all of the divergent species she assigned to the new genus.
Last update : 17/06/2021
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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 December 05, 2023]

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