Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Tharybidae ( Family )
            Undinella ( Genus )
Undinella simplex  (Wolfenden, 1906)   (F,M)
Syn.: Xanthocalanus simplex Wolfenden, 1906 (p.30, Descr.F, figs.F);
Undinella brevipes Farran, 1908 b (p.50, Descr.F, figs.F); Vervoort, 1957 (p.95, Rem.); Tanaka, 1960 a (p.131, figs. juv.M); Furuhashi, 1966 a (p.295, vertical distribution in Kuroshio region, Table 10); Minoda, 1971 (p.33, figs.F); Bradford & al., 1983 (p.127, figs.F,M, Rem.); Greze & al., 1985 (p.7); Boxshall & Halsey, 2004 (p.211, fig.F); Park & Ferrari, 2009 (p.143, Table 5, Appendix 1, biogeography);
Ref. compl.: Lysholm & Nordgaard, 1921 (p.19); Lysholm & al., 1945 (p.29); Grice & Hulsemann, 1967 (p.17); Fleminger, 1967 a (tabl.1); Park, 1970 (p.476); Deevey & Brooks, 1977 (p.256, tab.2, Station "S"); Roe, 1984 (p.358); Errhif & al., 1997 (p.423); Razouls & al., 2000 (p.343, Appendix); Holmes, 2001 (p.55)
Farran, 1926 (p.268); Rose, 1933 a (p.142, figs.F); Grice & Hulsemann, 1965 (p. 242, figs.M); Vives & al., 1975 (p.43, tab.II); Deevey & Brooks, 1977 (p.256, tab.2, Station "S"); Vives, 1982 (p.292); Greze & al., 1985 (p.7); Andronov, 2002 (p.75, figs.F,M); Vives & Shmeleva, 2007 (p.865, figs.F,M, Rem.)
Species Undinella simplex - Plate 1 of morphological figuresissued from : J.M. Bradford, L. Haakonssen & J.B. Jillett in Mem. N.Z. Oceanogr. Inst., 1983, 90. [p.125, Fig.76]. As Undinella brevipes.
Female: A, last thoracic segment and urosome (dorsal); B, idem (lateral right side); C, rostrum; D, A2; E, Md; F, terminal part of mandibular blade; G, Mx1; H, Mx2; I, P1; J, P2; K, P3; L, P4; M, P5.

Nota: The south-west Pacific specimens have small chitinous thickenings on the posterior metasome, urosome, and basipod segment 1 of P4 (as noted by Vervoort, 1957). There is a tendancy for the proximal segments of P2-4 to be fused. The specimens have at least 5 brush-like setae on the endopod of Mx2.

Species Undinella simplex - Plate 2 of morphological figuresissued from : G.D. Grice & K. Hulsemann in J. Zool., 1965, 146. [p.243, Fig.16, e-g].
Male (from Azores): e, habitus (dorsal); f, idem (lateral left side); g, P5.

Nota: Head and 1st thoracic segment fused, 4th and 5th fused.
Posterior lateral corners of cephalothorax with notch-like protuberances.
Anal segment very small. Rostrum with 2 filaments.
P5 with right exopod 2-segmented, endopod absent; left exopod 3, endopod 1-segmented, distal end of 2nd and 3rd segments of left exopod with tuft of hairs.

Species Undinella simplex - Plate 3 of morphological figuresissued from : V.N. Andronov in Arthropoda Selecta, 2002, 11 (1). [p.76, Figs.451-473].
Female (from E Atlantic): 451-452, habitus (dorsal and lateral, respectively); 453, rostrum; 454, genital segment (ventral); 455, Md (cutting edge); 456, P1; 457-458, exopod of P2 and P3, respectively; 459, P4; 460-463, P5 (of different specimens; 464, distal segment of left P5.

Male: 467, habitus (dorsal); 468, thoracic segment 4+5 and genital segment (dorsal); 469, thoracic segment 4+5 (right view); 470, rostrum; 471, P5.

Species Undinella simplex - Plate 4 of morphological figuresissued from : G.P. Farran in Fish. Ire. Sci. Invest., 1906, II [1908]. [Pl. V, Figs.1-4]. As Undinella brevipes.
Female (from 55°0'N, 10°48'W): 1, habitus (lateral); 2, rostrum; 3, P3; 4, P5.

Species Undinella simplex - Plate 5 of morphological figuresIssued from : O. Tanaka in Spec. Publs. Seto mar. biol. Lab., 10, 1960 VIII (1) [p.132, Fig. 103].
Immature Male (from Sagami Bay, Japan): a, habitus (dorsal); b, forehead (lateral); c, last thoracic segment and abdomen (lateral); d, rostrum (anterior aspect); e, Mx1; f, P5.

Species Undinella simplex - Plate 6 of morphological figuresIssued from : C. Razouls in Ann. Inst. océanogr., Paris, 1994, 70 (1). [p.132]. As Undinella brevipes.
Caractéristiques morphologiques de Undinella simplex femelle et mâle adultes.
Terminologie et abbréviations: voir à Calanus propinquus.
La station ''Kerfix'' est située à l'entrée de la Baie du Morbihan aux Ïles Kerguelen.

Compl. Ref.:
in CalCOFI regional list (MDO, Nov. 2013; M. Ohman, comm. pers.)
NZ: 13

Distribution map of Undinella simplex by geographical zones
Antarct. (Peninsula, Weddell Sea, Indian), sub-Antarct. (Indian, SW Pacif.), South Africa (Walvis Ridge), Angola-Namibia, off Congo, off Cape Verde Is., off Mauritania, off Canary Is., Ibero-moroccan Bay, off W Cabo Finisterre, Bay of Biscay, off Amazon, G. of Mexico, off Bermuda: Station ‘’ S’’ (32°10’N, 64°30’W), off S Iceland, SW Ireland, W Medit. (Alboran Sea), W Indian, S Indian (subtropical Convergence), Japan (Sagami Bay), Bering Sea, California, New Zealand (N), Tasman Sea
N: 24
(9) F: 1,55; 1,45; (24) F: 1,6; (25) F: 1,98-1,89; (38) F: 1,53-1,5; (208) F: 1,9; (226) M: 1,24; (239) F: 1,45; (881) F: 1,4-1,98; M: 1,35-1,48; {F: 1,40-1,98; M: 1,35-1,48}
Rem.: meso-bathypelagic. Sargasso Sea: 500-1500 m (Deevey & Brooks, 1977, Station "S").298-526 m at Station N-1 (SW Bösö, E middle Japan) froim Furuhashi (1966 a).
According to Vervoort (1957 p.95) the species Undinella brevipes is sometimes referred to as Undinella simplex (Wolfenden, 1906). It was originally described, however, as Xanthocalanus simplex Wolfenden, 1906 (p.30), while a species of the genus Xanthocalanus with the same trivial name was described in 1898 by Aurivillius (p.33, fig.7). The name used by Wolfenden consequently must be suppressed and the species should stand as Undinella brevipes Farran, 1908. This species is for the first time recorded from Antarctic (55°11’S, 55°51’E) and sub-Antarctic (47°43’S, 76°48’E) waters. The species can be distinguished from U. oblonga Sars (1900), by the smaller length, the pitted structure of the carapace and the shape of P5. In the ‘Banzare’ specimens P5 of females are symmetrical ; the terminal segment 3 of P5 carries 3 chitinous teeth at the apex. In Farran’s specimen the P5 appear to have been asymmetrical (Pl.5, fig.4).
For Grice & Hulsemann (1965, p.244) the male is distinguishable from U. oblonga Sars (1900) and U. frontalis (Tanaka, 1937) by the protrusions on the 5th thoracic segment and details of P5.

: R. Stephen, 2007 : Data sheets of NIO, Kochi, India (on line as Undinella brevipes).
Last update : 28/01/2017
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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 January 23, 2021]

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