Oncaea insolita - Species Card - Marine Planktonic Copepods

Species Card of Copepod

Cyclopoida ( Order )	details
Oncaeidae ( Family )	details
Oncaea ( Genus )	details	List species for this Genus

Oncaea insolita Heron & Frost, 2000 (F,M)

Abbreviations or symbols

Ref.:

(

List of the studied authors )

Heron & Frost, 2000 (p.1034, figs.F,M, tab.2, 3); Böttger-Schnack & Schnack, 2013 (p.11: Table 3, p.21, Rem.)

Species Oncaea insolita - Plate 1 of morphological figures

issued from : G.A. Heron & B.W. Frost in Proc. Biol. Soc. Washington, 2000, 113 (4). [p.1033, Fig.9, I].
Female (from NE Pacific): I, habitus (dorsal; scale bar: t).
Scale bars: 0.1 mm, see figures 3, 4, 5, 10 of Heron and Frost, 2000 for Oncaea canadensis and Oncaea insolita.

Species Oncaea insolita - Plate 2 of morphological figures

issued from : G.A. Heron & B.W. Frost in Proc. Biol. Soc. Washington, 2000, 113 (4). [p.1035, Fig.10].
Female: A, habitus (lateral; scale bar: x); B, pediger 4 posterior corner and urosome (lateral; scale bar: x); C, left A1 (scale bar: x); D, left A2 (scale bar: x); E, labrum (scale bar: v); F, right Md (scale bar: y); G, left Mx1 (scale bar: y); H, lright Mx2 (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 2.06:1. Gonopore at midway of dorsal surface.

Species Oncaea insolita - Plate 3 of morphological figures

issued from : G.A. Heron & B.W. Frost in Proc. Biol. Soc. Washington, 2000, 113 (4). [p.1036, Fig.11].
Female: A, left Mxp (scale bar: x); B-E, 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.
Endopods of swimming legs P2-P4 with terminal cone. P5 a free segment with 2 subequal terminal setae, the longer slifgtly spiniform; outer basal seta. P6 represented by spiniform setule on gonopore.

Species Oncaea insolita - Plate 4 of morphological figures

issued from : G.A. Heron & B.W. Frost in Proc. Biol. Soc. Washington, 2000, 113 (4). [p.1021, Fig.1, G].
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 for different Oncaea' species).

Nota: endopods of P2 and P3 with lateral spines not extending to base of subterminal spines.

Species Oncaea insolita - Plate 5 of morphological figures

issued from : G.A. Heron & B.W. Frost in Proc. Biol. Soc. Washington, 2000, 113 (4). [p.1037, Fig.12, A-B].
Male: A, habitus (lateral; scale bar: s); B, Mxp (ventral; scale bar: s).
Scale bars: 0.1 mm, see figures 3, 4, 5, 10 of Heron and Frost, 2000 for Oncaea canadensis and Oncaea insolita.

Nota: Swimming legs as in female.

Compl. Ref.:

(

List of the studied authors )

Nishibe & Ikeda, 2004 (p.931, Tab. 2, 5)

NZ:

Distribution map of Oncaea insolita by geographical zones

Loc:

(

Geographical glossary )

Station 'P', NE Pacif., NE Japan (Oyashio region)

Lg.:

(

References of the authors concerning dimensions )

(848) F: 0,82-0,96; M: 0,7-0,81; { F: 0,82-0,96; M: 0,70-0,81}

Rem.:

According to Heron & Frost (2000, p.1038) this species shows remarkable resemblance to O. latimana Gordeeva (1975), excepting the greater size difference, including the conspicuous, unusal male maxilliped. Gordeeva's illustration of the O. latimana P4 endopod does not show a terminal projection, but the subterminal spine, appearing to overlap the terminal spine, could possibly conceal a small projection similar to that of O. insolita.
O. insolita resembles O. illgi. also shows close affinity to three other species found in Antarctic: O. convexa, O. bowmani, and O. compacta. These species all have a relatively large Md, Mx1 and Mx2; the 3rd segment of A2 of the latter four species all have the inner seta, of the distal group of 7 elements, considerably reduced. The exterior form and ornamentation of the O. insolita labrum is especially similar to that of O. compacta.
For Böttger-Schnack & Schnack (2013, p.21) regarded as a member of the compacta-group, irrespective of its unusual character of a distal conical process on the endopodite 3 of P4.

Last update : 02/12/2016


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