Species Card of Copepod
Cyclopoida ( Order )
    Oncaeidae ( Family )
        Oncaea ( Genus )
Oncaea grossa  Heron & Frost, 2000   (F,M)
Ref.:
Heron & Frost, 2000 (p.1042, figs.F,M, tab.2, 3)
Species Oncaea grossa - Plate 1 of morphological figuresissued from : G.A. Heron & B.W. Frost in Proc. Biol. Soc. Washington, 2000, 113 (4). [p.1043, Fig.15, C-J].
Female (from NE Pacific): C, habitus (lateral; scale bar: t); D, pediger 4 posterior corner and urosome (dorsal; scale bar: t); E, right A1 (scale bar: x); G, right A2 (scale bar: x); H, labrum (scale bary); I, left Md (scale bar: y); J, right Mx1 (scale bar y).
Scale bars: 0.1 mm, see figures 3, 4, 5, 10 of Heron and Frost, 2000 for Oncaea canadensis and Oncaea insolita.

Nota: Ratio of length of prosome to that of urosome 2.16:1. Genital segment length approximately equal to that of remainder of urosome, anteroventral surface with transverse rows of minute spinules on and around a protruding ledge, followed by horizontal rows of small spinules. P5 with elongate free segment, 2 terminal setae, the longer less than twice the length of the shorter, which is dentiform; outer basal seta. P6 represented by spiniform setule on gonopore.


Species Oncaea grossa - Plate 2 of morphological figuresissued from : G.A. Heron & B.W. Frost in Proc. Biol. Soc. Washington, 2000, 113 (4). [p.1022, Fig.2, E].
Female: P2-P4 endopod terminal ''spine set'' (combination of the lengths, shapes, and position of the three or two terminal spines on the endopods of swimming legs 2-4 , from left to right in figure, for different Oncaea' species).

Nota: endopod of P2 with lateral spine extending beyond distal margin cone.


Species Oncaea grossa - Plate 3 of morphological figuresissued from : G.A. Heron & B.W. Frost in Proc. Biol. Soc. Washington, 2000, 113 (4). [p.1044, Fig.16].
Female: A, right Mx2 (scale bar: v); B, right Mxp (scale bar: x); C-F, P1 to P4 (scale bar: x).
Scale bars: 0.1 mm, see figures 3, 4, 5, 10 of Heron and Frost, 2000 for Oncaea canadensis and Oncaea insolita.

Nota: Endopods of P2 and P3 with a small terminal cone, P4 without.


Species Oncaea grossa - Plate 4 of morphological figuresissued from : G.A. Heron & B.W. Frost in Proc. Biol. Soc. Washington, 2000, 113 (4). [p.1045, Fig.17, A-C].
Male: A, habitus (lateral; scale bar: t); B, pediger 4 posterior corner and urosome (dorsal; scale bar: x); C, Mxp (ventral; scale bar: x).
Scale bars: 0.1 mm, see figures 3, 4, 5, 10 of Heron and Frost, 2000 for Oncaea canadensis and Oncaea insolita.

Nota: Ratio of length of prosome to that of urosome 1.97:1. Swimming legs as in female. P5 not delimited from thoracic segment, armament similar to that of female. P6 represented by posterolateral flap on ventral surface of genital segment.

Compl. Ref.:
Nishibe & Ikeda, 2007 (p.609, vertical distribution, seasonal variations); 2008 (p.398, tab.1)
NZ: 2

Distribution map of Oncaea grossa by geographical zones
Species Oncaea grossa - Distribution map 2issued from : Y. Nishibe & T. Ikeda in Mar. Biol., 2007, 150. [p.618, Fig.9];
Oncaea grossa. Vertical distribution of each developmental stage (C1-C6) at site H (41°30'N, 145°47'E, depth 6,670 m, in the Oyashio region).
Female and male data are shown separately for C4-C6.
Abbreviations are D day, N night.
Species Oncaea grossa - Distribution map 3issued from : Y. Nishibe & T. Ikeda in Mar. Biol., 2007, 150. [p.612, Fig.2];
Vertical profiles of temperature (solid line) and salinity (broken line) at site H (41°30'N, 145°47'E, depth 6,670 m, in the Oyashio region).
Loc:
NE Japan (Oyashio region), Alaska (Prince William Sound), Station 'P', Washington inland
N: 4
Lg.:
(848) F: 0,76-0,81; M: 0,63-0,7; { F: 0,76-0,81; M: 0,63-0,70}
Rem.: mesopelagic.
For Heron & Frost (2000, p.1045) the species closely resembles O. prolata in many characters. The denticles of the P5 female are conspicuaous and obscure for O. prolata. The Mxp male has a robust 2nd segment with rows of conspicuous spatulate setules, while O. prolata
Last update : 26/01/2015
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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 November 27, 2021]

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