Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Euchaetidae ( Family )
            Paraeuchaeta ( Genus )
Paraeuchaeta megaloba  Park, 1995   (F,M)
Syn.: Euchaeta megaloba : Park, 1994 (p.322)
Park, 1995 (p.44, Descr.F,M, figs.F,M)
Species Paraeuchaeta megaloba - Plate 1 of morphological figuresissued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 1995, 29. [p.142, Fig.32].
Female: a, forehead (left side); b, urosome (left); c, genital somite (left); d, Mx1 (first inner lobe omitted), posterior; e, P1 (anterior); f, P2 (anterior).
Nota: Similar in habitus to P. scotti but in lateral view, rostrum relatively small, pointing nearly parallel to anterior dorsal margin of forehead.
Genital somite relatively long; its dorsal hump less conspicuous than in P. scotti ; ventral margin of genital flange more or less convex; posterior edge of genital field produced into a large lobe; posterior margin of genital prominence meeting posterior ventral wall of somite in a smooth curve.
dorsal hump of 2nd urosomal somite more pronounced than in P. scotti.
Cephalosomal appendages similar to thoes of P. scotti except that outer lobe of Mx1 with 6 long setae and a minute seta proximally.
In P1 exopod, outer spine of 1st segment relatively well developed; outer spine of 2nd segment extending beyond base of following outer spine by 1/4 its length.
In P2 exopod, outer spine of 2nd segment extending a little beyond base of following outer spine; 2nd outer spine of 3rd segment extending beyond base of 3rd by 1/6 its length; 1st outer spine of 3rd segment thick and about 1.5 times length of 3rd; posterior incision of marginal lobe bearing 2nd outer spine of 3rd segment reaching level of preceding incision.

Male: g, forehead (left); h, last pedigerous and genital somites (left); i, P1 (anterior); j, P2 (anterior); k, distal exopodal segments of left 5th leg (anterior, tilted clockwise); l, idem (anterior, tilted counterclockwise); m, idem (lateral, tilted clockwise).

Species Paraeuchaeta megaloba - Plate 2 of morphological figuresParaeuchaeta megaloba Female:
1 - See key to species Groups and independent species of Paraeuchaeta (p.30): malayensis species Group.
2 - Outer spine of 2nd exopodal segment (or the 2nd of the first 2 exopodal segments forming a proximal, compound segment) of P1 normally developed (Fig.32-e).
3 - Outer lobe of Mx1 with 6 long setae in addition to 1 or 2 minute setae proximally (Fig.32-d).
4 - Genital somite without a conical process on left side close to anterior base of genital prominence (Fig.32-c).
5 - Dorsally and ventrally, genital somite symmetrical.
6 - Laterally, genital flange with normal posterior lobe (Fig.32-c).
7 - Laterally, genital somite with more or less smooth dorsal margin (Fig.32-c).
8 - Laterally, genital prominence with nearly straight or only slightly bulging posterior margin (Fig.32-c).
9 - Outer lobe of Mx1 with 6 long setae plus 1 or 2 very small setae (Fig.32-d).
10 - In 3rd exopodal segment of P2, 2nd marginal lobe separated from segment by very deep cleft and has long outer spine (Fig.32-f).

NZ: 7

Distribution map of Paraeuchaeta megaloba by geographical zones
NE Atlant. (off NW Cape Finisterre), Indonesia-Malaysia, S Japan, California, G. of California, S America, Pacif. (central S), Tasman Sea

Type locality: 13°47'S, 77°49'W.
N: 1
(3) F: 7,3-6,08; M: 5,83; {F: 6,08-7,30; M: 5,83}
Rem.: Park (1995, p.44) found this species widely in the Pacific: along the west coast of North and South America, including the Gulf of California, between 38°N and 35°S; in the central South Pacific at 39°S and 45°S; in the Tasman Sea; in the Banda Sea; off southern Japan; northeastern Atlantic between 17°W and 20°W and between 46°N and 49°N.
Last update : 27/01/2015
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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 25, 2024]

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