Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Euchaetidae ( Family )
            Paraeuchaeta ( Genus )
Paraeuchaeta prudens  Tanaka & Omori, 1968   (F)
Syn.: Pareuchaeta prudens Tanaka & Omori, 1968 (p.247, Descr.F, figs.F)
Bradford & al., 1983 (p.23); Park, 1994 (p.322); 1995 (p.41, Rem.F, figs.F)
Species Paraeuchaeta prudens - Plate 1 of morphological figuresissued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 1995, 29. [p.138, Fig.28].
Female: a, forehead (left side); b, urosome (left); c, d, e, f, genital somite (left, dorsal, right, ventral, respectively); g, Mx1 (first inner lobe separated), posterior; h, P1 (anterior); i, P2 (anterior).

Nota: Similar in habitus to P. eltaninae female but in lateral view rostrum more slender; urosome and genital somite more elongate.
Dorsal margin of genital somite in lateral view not conspicuously bulging and with a weak indentation at middle; posterior edge of genital field exte,ding for a shorter distance beyond posterior end of genital flange; sloping posterior margin of genital prominence as long as posterior ventral wall of somite. Dorsally, genital swelling centered a little anterior to middle of somite, followed by a marked constriction.
Cephalosomal appendages similar to those of P. eltaninae but in Mx1, 1st endopodal segment with 6 setae and outer lobe with 7 setae, the proximalmost of which smaller than the others, often being reduced to a very small seta.In P1 exopod, 2nd outer spine reaching base of 3rd and a little longer than 4th; 3rd outer spine about 1.5 times length of 5th.

Species Paraeuchaeta prudens - Plate 2 of morphological figuresissued from : O. Tanaka & M. Omori in Publs Seto Mar. Biol. Lab., 1968, XVI (4). [p.248, Fig.16]. As Pareuchaeta prudens.
Female: last thoracic segment and urosome (dorsal); B, genital complex (ventral); C, Mx1; D, P1; E, distal part of exopod of P2.

Nota: The urosome segments and furca are in the proportional lengths as 43:22:22:2:11 = 100.
Prosome and urosome are in the proportional lengths as 72 to 28.
Mx1 with 6 long setae on the outer lobe; endopod with 3+3+3 setae; 1st inner lobe with 13 setae; 2nd and 3rd inner lobes with each 1 seta; 2nd basal segment with 5 setae.

Species Paraeuchaeta prudens - Plate 3 of morphological figuresParaeuchaeta prudens 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.28-h).
3 - Outer lobe of Mx1 with 7 long setae in addition to 1 or 2 minute setae proximally (Fig.28-g).
4 - Genital somite without a conical process on left side close to anterior base of genital prominence (Fig.28-c).
5 - Dorsally and ventrally, genital somite symmetrical (Fig.28-d).
6 - Laterally, genital flange with normal posterior lobe (Fig.28-c).
7 - Laterally, genital somite with more or less smooth dorsal margin (Fig.28-c).
8 - Laterally, genital prominence with nearly straight or only slightly bulging posterior margin (Fig.28-c).
9 - Outer lobe of Mx1 with 7 long setae plus 1 or 2 very minute setae (Fig.25-d).
10 - Laterally, genital prominence with posterior margin equal to or longer than posterior ventral wall of somite (Fig.28-c).
11 - Laterally, posterior margin of genital prominence and posterior ventral wall of somite forming an angle of more than 140° (Fig.28-c).
12 - Laterally, genital genital prominence with posterior margin about as long as posterior ventral wall of somite (Fig.28-c).
13 - In P1 exopod, 2nd outer spine far short of reaching base of 3rd outer spine (Fig.28-h).

NZ: 6

Distribution map of Paraeuchaeta prudens by geographical zones
S Atlant., Japan (Aogashima Is.), Tasman Sea, off San Diego, E Pacif. (tropical)

Locality type: 32.457°N, 139.767°E.
N: 2
(3) F: 7,9-7,3; (63) F: 7,78; {F: 7,30-7,90}
Rem.: Park (1995,p.41) found this species off central Japan, in the Tasman Sea, off San Diego, the eastern tropical Pacific off Central America, and the South Atlantic.
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 July 17, 2024]

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