Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Euchaetidae ( Family )
            Paraeuchaeta ( Genus )
Paraeuchaeta simplex  Tanaka, 1958   (F,M)
Syn.: Pareuchaeta simplex Tanaka, 1958 (p.336, figs.F,M); Tanaka & Omori, 1968 (p.253, figs.F); Park & Choi, 1997 (Appendix); Mauchline, 1998 (tab.42);
Euchaeta flava : Mori, 1932 a (p.168, figs.F,M); 1937 (1964) (p.47, figs.F,M); Chiba, 1953 a (p.616, figs.F); Kos, 1972(Vol. I, figs. F, M)
Bradford & al., 1983 (p.23); Park, 1994 (p.320); 1995 (p.86, Rem.F, figs.F)
Species Paraeuchaeta simplex - Plate 1 of morphological figuresissued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 1995, 29. [p.193, Fig.83].
Female: a, forehead (left side); b, urosome (left); c, d, e, genital somite (left, right, ventral, respectively); f, distal end of urosome (ventral); g, P1 (anterior); h, P2 (anterior).

Species Paraeuchaeta simplex - Plate 2 of morphological figuresissued from : O. Tanaka in Publs Seto Mar. Biol. Lab., 1958, VI (3). [p.337, Fig.66]. As Pareuchaeta simplex.
a, habitus (dorsal); b, forehead (lateral left side); c, last thoracic seglment and urosome ((lateral left side); d, genital field (ventral); e, exopod of P2. Nota: The first three urososome segments have the proportional lengths measured in 0.01 mm: 41:22:20.A1 exceeds the posterior margin of the last thoracic segment by distal 2 segments.

Male: f, forehead (lateral left side); g, last thoracic segment and genital segment (lateralk left side); h, 1st and 2nd segment of exopod of left P5.
Nota: The proportional lengths of the first four urosome segments in 0.01 mm: 17,9:17,9:12,5.

Species Paraeuchaeta simplex - Plate 3 of morphological figuresissued from : T. Mori in The pelagic Copepoda from the neighbouring waters of Japan, 1937 (2nd edit., 1964). [Pl.21, Figs.9-14]. As Euchaeta flava.
Female: 9, P2; 10, genital area; 11, Mx2.

Male: 12, distal segment of left P5; 13, P5; 14, habitus (lateral).

Species Paraeuchaeta simplex - Plate 4 of morphological figuresissued from : T. Mori in The pelagic Copepoda from the neighbouring waters of Japan, 1937 (2nd edit., 1964). [Pl.22, Figs.1-2]. As Euchaeta flava.
Female: 1-2, habitus (lateral and dorsal, respectively).

Species Paraeuchaeta simplex - Plate 5 of morphological figures
Paraeuchaeta simplex Female:
1 - See key to species Groups and independent species of Paraeuchaeta (p.30).
2 - Right genital flange small, not well defined (Fig.83-e).
3 - Laterally, lateral plate of genital operculum produced into large, rounded tubercular outgrowth (Fig.83-d).

Compl. Ref.:
Furuhashi, 1966 a (p.295, vertical distribution in Kuroshio region, Table 10) ; Park & Ferrari, 2009 (p.143, Table 8, biogeography)
NZ: 2

Distribution map of Paraeuchaeta simplex by geographical zones
Korea, Japan (Izu), Formosa Strait
N: 7
(3) F: 3,36; (63) F: 3,81-3; M: 3-2,94; (99) F: 3,45-3,15; M: 2,88-2,77; (151) F: 3,73; M: 3,45; {F: 3,00-3,81; M: 2,77-3,45}

The mean female size is 3.417 mm (n = 6; SD = 0.3168), and the mean male size is 3.008 mm (n = 5; SD = 0.2613). The size ratio (male : female) is 0.864 (n = 2; SD = 0.0113), probably ± 87 %.
Rem.: mesopelagic. 82-256 m at Station N-1 (SW Bösö, E middle Japan) from Furuhashi (1966 a).According to Tanaka, 1958 (p.338) the species is close to P. russeli.
Last update : 24/05/2019
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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 June 24, 2024]

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