Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Aetideidae ( Family )
            Undeuchaeta ( Genus )
Undeuchaeta intermedia  A. Scott, 1909   (F,M)
Syn.: Undeuchaeta bispinosa Esterly, 1911 (p.318, figs.F); 1912; 1916 (p.171, 180, nutrition); Sewell, 1929 (p.124, figs.F,M); 1947 (p.103); Brodsky, 1950 (1967) (p.184, figs.F); Wickstead, 1962 (p.550, food & feeding); Lee & al., 1971 (p.1150, 1151); Morioka, 1972 a (p.314); Hattori, 1991 (tab.1, Appendix); in CalCOFI regional list (MDO, Nov. 2013; M. Ohman, comm. pers.); Sano & al., 2013 (p.11, Table 7, food habits)
A. Scott, 1909 (p.63, Descr.F, figs.F); Vervoort, 1957 (p.73, Rem.); Grice, 1962 (p.199, figs.F); Bradford, 1970 a (p.354, figs.F); Markhaseva, 1996 (p.302, figs.F); Conway & al., 2003 (p.177, figs.F, Rem., F,M); Mulyadi, 2004 (p.51, figs.F, Rem.);
Species Undeuchaeta intermedia - Plate 1 of morphological figuresissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.305, Fig.245].
Female (from W Indian). Ce: forehead (lateral); P.md: mandibular palp; Gn: genital segment (ventral view).

Species Undeuchaeta intermedia - Plate 2 of morphological figuresissued from : J.M. Bradford in N.Z. Jl Mar. Freshw. Res., 1970, 4 (4). [p.354, Figs 18-19].
Female (off Kaikoura, New Zealand): 18, genital segment (lateral right side); 19, forehead (lateral).
Scale bars represent 0.1 mm.

Species Undeuchaeta intermedia - Plate 3 of morphological figuresissued from : R.B.S. Sewell in Mem. Indian Mus., 1929, X. [p.125, Fig.47]. As Undeuchaeta bispinosa.
Female (from laccadive Sea): a, posterior thoracic margin and the first two abdominal segments (dorsal); b, posterior thoracic margin and urosome (lateral left side); c, A2; d, Mx1; e, Mx2.

Species Undeuchaeta intermedia - Plate 4 of morphological figuresissued from : R.B.S. Sewell in Mem. Indian Mus., 1929, X. [p.127, Fig.48. As Undeuchaeta bispinosa.
Male: a, P1; b, P2; c, P5.

Nota after Conway & al. (2003, p.177): P5 biramous. Right exopodal segment 1 with sharp spine on the first third of the segment, with small projection on opposite side; internal segment covered with almost parallel wavy lines. Left endopodite reaching the distal end of the 1st exopodal segment, 2nd exopodal segment with spine-like projection on external distal border, 3rd exopodal segment proximal angle extending into a spine.

Species Undeuchaeta intermedia - Plate 5 of morphological figuresissued frm : A. Scott in Siboga-Expedition, 1909, XIX a. [Plate IXXIII, Figs.1-8].
Female (from Indonesia-Malaysia): 1, habitus (dorsal); 2, forehead (lateral); 3, last thoracic and genital segments (left side); 4, idem (right side); 5, rostrum; 6, A1; 7, P1; 8, P2.

Species Undeuchaeta intermedia - Plate 6 of morphological figuresissued from : C.O. Esterly in Univ. Calif. Publs Zool., 1911, 6 (14). [Pl.26, Fig.4]. As Undeuchaeta bispinosa.
Female (from San Diego Region): 4, habitus (lateral).
Nota: A1 as long as the cephalothorax.

Species Undeuchaeta intermedia - Plate 7 of morphological figuresissued from : C.O. Esterly in Univ. Calif. Publs Zool., 1911, 6 (14). [Pl.29, Fig.48, 56]. As Undeuchaeta bispinosa.
Female: 48, last thoracic segment and genital seggment, showing spermatophore (lateral); 56, genital segment (ventral).
Nota: The genital segment has the hook-like appendage at the right of the orifice, but in addition there is a spine on the right side of the segment about midway between the anterior and posterior borders; there is a 2nd and much shorter spine at the left orifice.; the segment carries a group of heavy spines on the left side at the posterior border, and usually the 2nd segment is similar in that regard.

Species Undeuchaeta intermedia - Plate 8 of morphological figuresissued from : G.D. Grice in Fish. Bull. Fish and Wildl. Ser., 1962, 61. [p.198, Pl.12, Figs.15-18].
Female (from equatorial Pacific): 15-16, posterior part of thorax and urosome (dorsal and ventral, respectively); 17, genital segment (lateral, left side); 18, same (right side).
Nota: A large ventral spine-like protrusion on the genital segment.

Species Undeuchaeta intermedia - Plate 9 of morphological figuresissued from : Mulyadi in Published by Res. Center Biol., Indonesia Inst. Sci. Bogor, 2004. [p.51, Fig.27].
Female (from Flores Sea): a, habitus (dorsal); b, urosome (dorsal); c, angle of posterior thoracic segment and genital complex (lateral right side); d, genital complex (ventral); e, P1.

Species Undeuchaeta intermedia - Plate 10 of morphological figuresUndeuchaeta intermedia female:
1 - Cephalon without crest.
2 - Posterior corners of last thoracic segment always triangular (lateral and dorsal view).
3 - Genital segment with spine on genital field (lateral view).

Species Undeuchaeta intermedia - Plate 11 of morphological figuresUndeuchaeta intermedia male:
1 - Cephalon without crest.
2 - Endopodite of left P5 exceeding distal border of exopodal segment 2. The second third of endopod external border with 2 teeth-like projections.

Compl. Ref.:
De Decker & Mombeck, 1964 (p.14); Grice & Hulsemann, 1967 (p.15); Fleminger, 1967 a (tabl.1); Morris, 1970 (p.2300); Björnberg, 1973 (p.325, 389); Gaudy & Boucker, 1983 (p.37, Table 1, 3, fig.1, 2, Rem.: metabolism); Dessier, 1983 (p.89, Tableau 1, Rem., %); Guangshan & Honglin, 1984 (p.118, tab.); Rudyakov, 1986 (tab.1); Hernandez-Trujillo, 1989 a (tab.1); Cervantes-Duarte & Hernandez-Trujillo, 1989 (tab.3); Heinrich, 1990 (p.17); Hernandez-Trujillo, 1991 (1993) (tab.I); Shih & Young, 1995 (p.67); Suarez-Morales & Gasca, 1998 a (p108); Haury & al., 2000 (p.69, Table 1); Hernandez-Trujillo & Suarez-Morales, 2002 (p.748, tab.1); Bradford-Grieve, 2003 (p.96, tab.1); Gallienne & al., 2004 (p.5, tab.3); Lavaniegos & Jiménez-Pérez, 2006 (p.158, tab.2, 4, Rem.); Galbraith, 2009 (pers. comm.); in CalCOFI regional list (MDO, Nov. 2013; M. Ohman, comm. pers.)
NZ: 9

Distribution map of Undeuchaeta intermedia by geographical zones
South Africa (E), Mascarene Basin, Rodrigues Is. - Seychelles, off Sri Lanka (E & SW), Indian, Indonesia-Malaysia, Flores Sea, Pacif. (central subtropical N), Pacif. (equatorial), Pacif. (W equatorial), New Zealand, SE North Island, China Seas (East China Sea, South China Sea), Japan (off Sanriku), Vancouver Is., California, San Diego, W Baja California, South America, Pacif. (SE tropical), Chile (N & S, sub-Antarct.).

Type locality: Malay Archipelago.
N: 36
(5) F: 4,5; (29) F: 4,25-3,56; M: 3,69-3,62; (37) F: 4,5-3,56; (101) F: 4,28-3,99; (143) F: 4,5; (313) F: 4,2; (1122) F: 4,01; {F: 3,56-4,50; M: 3,62-3,69}
Rem.: Considered as vertical migrator.
According to Vervoort (1957, p.73) the main difference between U. intermedia and U. bispinosa is the presence of a spine in U. bispinosa on the left side of the genital somite, absent after A. Scott (1909) in U. intermedia. Both species have a strong spine on the right side of the genital orifice and a strong spine on the right side of the genital somite. A careful examination of the ‘Siboga’ specimens identified by A. Scott shows that nearly all specimens have a more or less developed spine on the left side of the genital opening ; some specimens have no trace of such a spine (and apparently such a specimen was used by A. Scott for the description of the form). The comparison of the figures by A. Scott and Sewell shows minor differences in the localisation of the patches of spinules on the abdominal somites and relative length of the abdominal somites. The spine on the right side of the genital somite also shows some variability, but it is never completely absent. ; in some specimens this right spine is extremely strong (much stronger than has been figured by Sewell (1929, fig.47b) ; it reaches the middle of the 2nd abdominal somite. The spine on the right side of the genital orifice is always present ; on the left side of the orifice a ridge may be present, which sometimes has the appearance of a small spine, so that the genital opening is flanked by 2 spines of unequal size. It seems reasonable to suppose that A. Scott, Esterly and Sewell studied representatives of a single variable species. The male of U. intermedia has been described by Sewell (1929, p.124) as the male of U. bispinosa.
The synonymy with U. bispinosa established by Vervoort (1957) and followed by Markhaseva (1996) is not taken up by Park (1978, p.182) and with doubt by Bradford & Jillett (1980, p.80).

See in DVP Conway & al., 2003 (version 1).
Last update : 09/12/2020
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2021. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed February 28, 2021]

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