Species Card of Copepod
Calanoida ( Order )
    Diaptomoidea ( Superfamily )
        Pontellidae ( Family )
            Labidocera ( Genus )
Labidocera diandra  Fleminger, 1967   (F,M)
Fleminger, 1967 (p.16, figs.F,M); 1975 (p.401 & suiv.)
Species Labidocera diandra - Plate 1 of morphological figuresissued from : A. Fleminger in Proc. U.S. natn Mus., 1967, 120 (3567). [p.18, Fig.6].
Female (from 24°14'N, 111°18'W): a, right Md (cutting edge); b, P5 (posterior); c, cephalosome (right lateral); d, habitus (dorsal); e, last thoracic segments and urosome (left side); f, same (right side); g, same with spermatophore (right side); h, same (dorsal).

Species Labidocera diandra - Plate 2 of morphological figuresissued from : A. Fleminger in Proc. U.S. natn Mus., 1967, 120 (3567). [p.20, Fig.7].
Male (morph A): a, right A1; b, dentition of fusion segment 19-21; c, last thoracic segments and urosome with P5 (right side); d, P5 (posterior); e, terminal segment of left P5 (lateral view); g, P3 (posterior); h, chela of P5 (anterior view).

Species Labidocera diandra - Plate 3 of morphological figuresissued from : A. Fleminger in Proc. U.S. natn Mus., 1967, 120 (3567). [p.21, Fig.8].
male (morph 2): a, right A1 (dorsal view); b, posterior portion of body (right side); c, cephalosome (right side); d, P5 (posterior); e, chela of P5 (lateral view); f, left P5 (lateral view); g, terminal segment of left P5 (ventral surface); h, chela of P5 (medial view); i, P3 (posterior; j, last thoracic segments and urosome with P5 (dorsal) k, forehead (dorsal).
Nota: Morph A differs from morph B in details of the right A1 and chela of right P5.

Species Labidocera diandra - Plate 4 of morphological figuresissued from : A. Fleminger in Proc. U.S. natn Mus., 1967, 120 (3567). [p.21, Fig.8, l].
Copépdite stage V: l, forehead (dorsal).
Nota: head-hooks were seen in all immature copepodites from stages II to V (Secondary loss of head-hooks in the mature stage).
Remarks (p.30) The presence or absence of head-hooks in pontellids, and sepecially in Labodocera, has been widely regarded as a feature of considerable taxonomic significance. Obviously, if head-hooks can vary in occurrence intraspecifically, their usefulness to phylogeny hinges upon a thorough survey of all species in the genus.

Compl. Ref.:
van der Spoel & Heyman, 1983 (p.106); Brinton & al., 1986 (p.228, fig.11; spatial distribution, Table 1); Jimenez-Perez & Lara-Lara, 1988; Hernandez-Trujillo, 1989 (tab.1); Cervantes-Duarte & Hernandez-Trujillo, 1989 (tab.3); Suarez-Morales & Gasca, 1998 a (p.110); Lavaniegos & Gonzalez-Navarro, 1999 (p.239, Appx.1); Lavaniegos & al., 2012 (p. 11, Appendix); Palomares-Garcia & al., 2013 (p.1009, Table I, abundance vs environmental factors); in CalCOFI regional list (MDO, Nov. 2013; M. Ohman, comm. pers.); Hernandez-Trujillo & al., 2013 (p.303, weight vs length); Mendoza Portillo, 2013 (p.37: Fig.7, seasonal dominance); Beltran Castro, 2014 (p.42: Rem., Table 1) ; Palomares-Garcia & al., 2018 (p.178, Table 1: occurrence)
NZ: 1

Distribution map of Labidocera diandra by geographical zones
Species Labidocera diandra - Distribution map 2Issued from : E. Brinton, A. Fleminger & D. Siegel-Causey in CalCOFI Rep., 1986, 27. [p.262, Fig.23].
Roughly estimated abundance of Calanus pacificus californicus in the 0-140 m layer sampled by CalCOFI during April and August 1957 in the Gulf of California.
California, W Baja California, Gulf of California, Bahia de La Paz, Bahia de los Angeles
N: 14
(467) F: 3,49-2,57; M: 3,25-2,51; {F: 2,57-3,49; M: 2,51-3,25}
''Labidocera jollae'' Group. (in Brinton & al., 1986).
Last update : 13/11/2020
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2023. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed November 28, 2023]

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