Species Card of Copepod
Calanoida ( Order )
    Metridinidae ( Family )
        Metridia ( Genus )
Metridia discreta  Farran, 1946   (F,M)
Syn.: Metridia boecki : Sars, 1925 (p.199, figs.F); Jespersen, 1934 (p.100); 1939 (p.68, Rem.); Brodsky, 1950 (1967) (part., p.296, figs. Sars, non Indian Ocean after Sewell, 1932; Rem.)
Farran, 1946 (p.215, Rem.); 1948 c (n°14, p.3, figs.F); Grice & Hulsemann, 1965 (p.224, 244, Descr.M, figs.M, Rem.); 1967 (p.17, 28: Rem.); Bradford-Grieve & al., 1999 (p.884, 948, figs.F)
Species Metridia discreta - Plate 1 of morphological figuresissued from : G.D. Grice & K. Hulsemann in J. Zool., 1965, 146. [p.243, Fig.16, h-k].
Male (from W Madeira Is.): h, posterior end of cephalothorax and 1st urosomal segment (lateral left side); i, P5; j, end of terminal segment of right P5; k, left P5.
Nota: 5th thoracic segment broadly rounded.
right P5 with internal spine from 2nd exopod segment nearly reaching to tip of 3rd exopod segment; 2 small terminal and one subterminal spine on 3rd exopod segment. Left P5 with seta on 1st exopod segment, seta and spine on 2nd exopod segment. A1 reaches to the furca.

Species Metridia discreta - Plate 2 of morphological figuresIssued from : G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl.LIV, figs.8-11]. As Metridia boecki.
Female: 8, habitus (dorsal); 9, proximal portion of A1; 10, 1st endopodal segment of P2; 11, P5.

Compl. Ref.:
Grice, 1963 a (p.496); Harding, 1974 (p.141, tab.2, 3, gut contents); Deevey & Brooks, 1977 (p.256, tab.2, Station "S");
NZ: 6

Distribution map of Metridia discreta by geographical zones
Brazil (off NE Recife), off N Haiti, off Bermuda: Station ‘’ S’’ (32°10’N, 64°30’W), Sargasso Sea, off E Cape Cod, off Mauritania, W Madeira, Azores, S Strait of Davis (in Jespersen, 1934), SE Greenland (rare, in Jespersen, 1939), W Indian.
N: 10
(1) F: 3,35; (226) M: 2,04; {F: 3,35; M: 2,04}
Rem.: bathypelagic. Sargasso Sea: 1000-2000 m (Deevey & Brooks, 1977, Station "S"); In vertical tow 2000-1000 m (slope) and 4000-3000 m (Sargasso Sea, possible contaminant species from higher up the water column) (Harding, 1974).
Grice & Hulsemann (1965, p.244) point to: On the basis of A1 length and total size Farran (1946) proposed that the female Atlantic specimens previously recorded as M. boecki, were distinct from the Pacific forms described by Giesbrecht (1889) as M. boecki.
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 21, 2024]

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Marine Planktonic Copepods

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