Species Card of Copepod
Calanoida ( Order )
    Metridinidae ( Family )
        Metridia ( Genus )
Metridia ignota  Esterly, 1906   (F)
Esterly, 1906 a (p.71, Descr.F, fig.F); Sewell, 1913 (p.354); 1948 (p.557, 563); Brodsky, 1950 (1967) (p.305, fig.F)
Species Metridia ignota - Plate 1 of morphological figuresissued from : C.O. Esterly in Univ. Calif. Publs Zool., 1906, 3 (5). [Pl.9, Fig.20].
Female (from San Diego, California): 20, forehead (lateral).

Nota: Caudal rami 6-times as long as broad and as long as the anal segment; the latter is only slightly shorter than the genital segment, and the genital segment is twice as long as the middle segment.
The basal segment of A1 has 3 straight spines, of which the middle one is the shortest.
P5 4-segmented, teminal segment with 3 bristles of about equal lengths; the 2nd segment has a spinulose bristle on the outer margin which reaches beyond the end of the last segment of the foot; the 3rd segment is provided with a stout spine on the outer margin.
Body very translucent, no pigment.

Compl. Ref.:
in CalCOFI regional list (MDO, Nov. 2013; M. Ohman, comm. pers.)
NZ: 2

Distribution map of Metridia ignota by geographical zones
NE Pacif. (California: San Diego), Indian (Bay of Bengal)
N: 3
(17) F: 5,8; {F: 5,80}
Rem.: In vertical haul: 0-730 m. For Esterly (1906a, p.71) this species resembles Metridia princeps, but the shape of the head, the relative lengths of the urosomal segments, and P5 will distinguish the two.
Last update : 17/01/2015
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2024. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed May 18, 2024]

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Marine Planktonic Copepods

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