Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Phaennidae ( Family )
            Onchocalanus ( Genus )
Onchocalanus cristatus  (Wolfenden, 1904)   (F,M)
Syn.: Xanthocalanus cristatus Wolfenden, 1904 (p.119, Descr.F, figs.F); 1906 (p.32, Rem.F); Pearson, 1906 (p.20);
? Xanthocalanus similis Esterly, 1906 a (p.68, figs.F);
? Onchocalanus rostratus Sars, 1912 a (p.654)
Ref.:
Farran, 1908 b (p.49); A. Scott, 1909 (p.82, figs.F); Wolfenden, 1911 (p.277); With, 1915 (p.228, figs.F,M); Lysholm & Nordgaard, 1921 (p.18); Sars, 1925 (p.147, figs.F); Rose, 1929 (p.26); 1933 a (p.137, figs.F); Jespersen, 1934 (p.84); 1940 (p.34); C.B. Wilson, 1942 a (p.199, fig.F); Lysholm & al., 1945 (p.25); Sewell, 1948 (p.348, 501, 508, 546, 549); Vervoort, 1950 a (p.9, figs.F, Rem.); Tanaka, 1960 a (p.117, figs.M); Fagetti, 1962 (p.23); Vervoort, 1965 (p.31, Rem.); Harding, 1966 (p.24, figs.M); Owre & Foyo, 1967 (p.57, figs.F,M); Vives, 1972 (p.213, 214, figs.F); Björnberg & al., 1981 (p.637, figs.F); Bradford & al., 1983 (p.61, 67, figs.F,M, Rem.); Park, 1983 a (p.335, figs.F,M, Rem.); Roe, 1984 (p.357); Tanaka & Omori, 1992 (p.263, figs.F,M); Razouls, 1994 (p.103, figs.F,M); Chihara & Murano, 1997 (p.854, Pl.140,141: F,M); Vives & Shmeleva, 2007 (p.689, figs.F,M, Rem.)
Species Onchocalanus cristatus - Plate 1 of morphological figuresissued from : J.M. Bradford, L. Haakonssen & J.B. Jillett in Mem. N.Z. Oceanogr. Inst., 1983, 90. [p.68, Fig.37].
Female: A, habitus (dorsal); B, forehead (lateral view); C, Mx2; D, P5.
Nota: Vervoort (1950) describes the terminal joint of female P5 as having a spine on both the inner and outer margins, while the south-west Pacific specimen has the inner spine only.

Male: E, habitus (lateral left side); F, Mx2; G, P5; H, terminal part of left P5 exopod.


Species Onchocalanus cristatus - Plate 2 of morphological figuresissued from : T. Park in Antarct. Res. Ser. Washington, 1983, 39 (5). [p.340, Fig.13].
Female: a, forehead (lateral); b, last thoracic segments and urosome (lateral left side); c, idem (dorsal); d, forehead (dorsal); e, genital segment (lateral left side); f, Mxp; g, distal part of Mxp; h, P1 (posterior); i, P5 (posterior).


Species Onchocalanus cristatus - Plate 3 of morphological figuresissued from : T. Park in Antarct. Res. Ser. Washington, 1983, 39 (5). [p.341, Fig.14].
Male: a, habitus (lateral left side); b, forehead (lateral); c, idem (dorsal); d, last thoracic segments with P5 and urosome (lateral left side); e, last thoracic segments and urosome (dorsal); f, posterior part of metasome (lateral right side); g, rostrum (anterior); h, A2.


Species Onchocalanus cristatus - Plate 4 of morphological figuresissued from : T. Park in Antarct. Res. Ser. Washington, 1983, 39 (5). [p.342, Fig.15].
Male: a, Md; b, Mx1; c, Mx2; d, Mxp; e, P1 (anterior); f, P2 (posterior); g, P5 (posterior); h, distal part of right P5; i, distal segment of left P5 (posterior).


Species Onchocalanus cristatus - Plate 5 of morphological figuresissued from : O. Tanaka & M. Omori in Publ. Sero Mar. Biol. Lab., 1992, 35 (4/5). [p.264, Fig.5].
Female (from Izu region, Japan): a, forehead (dorsal); b, idem (lateral); c, distal part metasome and urosome (dorsal); d, idem (lateral left side); e, A2; f, Md; g, Mx1; h, Mx2; i, P1; j, P5.


Species Onchocalanus cristatus - Plate 6 of morphological figuresissued from : O. Tanaka & M. Omori in Publ. Sero Mar. Biol. Lab., 1992, 35 (4/5). [p.265, Fig.6].
Male (from Izu region, Japan): a, rostrum (lateral); b, posterior part metasome and urosome (dorsal); c, A2; d, Mx1; e, Mxp; f, P5; g, h, distal part of left and right P5.


Species Onchocalanus cristatus - Plate 7 of morphological figuresissued from : O. Tanaka in Publ. Sero Mar. Biol. Lab., 1960, VIII (1). [p.118, Fig.96].
Male (from Sagami Bay, Japan): a, habitus (dorsal); b, forehead (lateral); c, last thoracic segment with P5 and urosome (lateral left side); d, Mx2; e, P2; f, terminal spine of exopod of P2; g, right P5.

Nota: In dorsal view the anterior margin of the head produced, forming a low crest.
Lateral distal corner of the last thoracic segment triangularly produced and terminates into a sharp point.
Abdomen 5-segmented, contained 3.1 times in the length of cephalothorax.
The abdomen and caudal rami are in the proportional length 19 : 31 : 25 : 14: 5 : 5 = 100; the 2nd to 5th segments are furnished with small teeth on the distal margin. Caudal rami 1.6 times as wide as long.
A1 extends to the distal end of the 3rd abdominal segment.
The mouth parts as those of O. trigoniceps figured by Sars; Mx2 slightly reduced and soft-skined.
The terminal spine of exopodite of P2 has about 60 serrations.
Left P5 5-segmented and long, the distal segment terminates into a fine spine; right P5 3-jointed, the distal joint composed of 3 segments incompletely fused, and furnished on the distal margin with an outer marginal spine and short hairs.


Species Onchocalanus cristatus - Plate 8 of morphological figuresissued from: W. Vervoort in Zool. Verh. Leiden, 1950, 10. [p.10, Fig.1].
Female from Celebes Sea): a, cephalon (lateral right side), A1 removed; b, posterior part of cephalothorax and urosome (lateral right side).


Species Onchocalanus cristatus - Plate 9 of morphological figuresissued from: W. Vervoort in Zool. Verh. Leiden, 1950, 10. [p.11, Fig.2].
Female (from Celebes Sea): a, forehead (dorsal); b, rostrum (ventral view); c, posterior part of cephalothorax and urosome (dorsal); d, right Mx2; e, right P5 (posterior aspect).

Nota: The abdominal segments and furca in the proportional lengths 41:27:17:4:11 = 100. Head and 1st thoracic segment separate, 4th and 5th separate (only visible on the dorsal surface). Head carinated. Urosome with very short, pickly hairs, in addition there are some ptches of longer hairs, closely packed together (especially on the rostral wall of the genital segment.


Species Onchocalanus cristatus - Plate 10 of morphological figuresIssued from : G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl.XLI, figs.1-5].
Female: 1, habitus (dorsal); 2, idem (lateral left side); 3, forehead (lateral); 4, rostrum (frontal view); 5, P5.


Species Onchocalanus cristatus - Plate 11 of morphological figuresissued from : A. Scott in Siboga-Expedition, 1909, XIX a. [Plate XXXIV, Figs.1-8].
Female (from Halmahera Sea & Manipa Strait): 1, habitus (dorsal); 2, forehead (lateral); 3, last thoracic and genital segments (left side); 4, rostrum; 5, Mx2 (distal portion); 6, P2; 7, P4; 8, P5.


Species Onchocalanus cristatus - Plate 12 of morphological figuresissued from : C.B. Wilson in Scientific Results of Cruise VII of the Carnegie during 1928-1929. Biology-I. Carnegie Inst. Wash. Publ. 536, 1942. [p.229, Fig.90].
Female (from SE Pacific): 90, P5.


Species Onchocalanus cristatus - Plate 13 of morphological figuresissued from : R.N. Wolfenden in J. mar. biol. Ass. U.K, 1904, VII (N.S.). [Pl.IX, Figs.18, 19].
Female (from off W Ireland): 18, P5; 19, forehead with prominet crest (dorsal).
Nota: A1 extending to the end of the caudal rami. Mx2 with very strong curved hook on the 5th lobe; endopod with 7 short thick brush processes and a long thin curved vermiform process: Mxp with brush sensory process on the 1st basal segment.


Species Onchocalanus cristatus - Plate 14 of morphological figuresissued from : C.O. Esterly in Univ. Calif. Publs Zool., 1906, 3 (5). [Pl.9, Fig.1]. As Xanthocalanus similis. With doubt.
Female (from San Diego, California): 1, forehead (lateral).
Nota: A1 extend back as far as the posterior border of the cephalothorax.


Species Onchocalanus cristatus - Plate 15 of morphological figuresissued from : C.O. Esterly in Univ. Calif. Publs Zool., 1906, 3 (5). [Pl.10, Fig.24]. As Xanthocalanus similis. With doubt.
Female: 24, last thoracic segment (lateral).
Nota: Genital and anal segments equal in length, the 2nd segment the longest of the four.
Rem: The first proximal segments are probably incorrectly figured.


Species Onchocalanus cristatus - Plate 16 of morphological figuresissued from : C.O. Esterly in Univ. Calif. Publs Zool., 1906, 3 (5). [Pl.12, Fig.60, 61]. As Xanthocalanus similis. With doubt.
Female: 60, distal portion of Mx2 showing the sensory appendages; 61, P1.
Nota: mx2 has 7 penicillate sensory appendages and 1 long, vermiform process, and a very long, heavy, curved hook on the terminal lobe. Mxp has a short penicillate sensory process on the outer margin of the 1st basal near the base of the segment.


Species Onchocalanus cristatus - Plate 17 of morphological figuresissued from : C.O. Esterly in Univ. Calif. Publs Zool., 1906, 3 (5). [Pl.13, Figs.71, 77]. As Xanthocalanus similis. With doubt.
Female: 71, P3; 77, P5.


Species Onchocalanus cristatus - Plate 18 of morphological figuresissued from : C. With in The Danish Ingolf-Expedition, Copepoda I, 1915, III, 4. [Pl.VIII, Fig.17, a-b, f].
Female (from 61°30'N, 17°08'W): a, head (lateral; b, P2 (left endopodite); f, left P5.


Species Onchocalanus cristatus - Plate 19 of morphological figuresissued from : C. With in The Danish Ingolf-Expedition, Copepoda I, 1915, III, 4. [Pl. VII, Fig.6 a].
Female: a, left P5 (distal segment).


Species Onchocalanus cristatus - Plate 20 of morphological figuresissued from : C. With in The Danish Ingolf-Expedition, Copepoda I, 1915, III, 4. [Pl. VIII, Fig.17, c-e].
Male: c, head (lateral); d, right P5 (anterior view); e, left P5 (distal exopodal segment).


Species Onchocalanus cristatus - Plate 21 of morphological figuresissued from : C. With in The Danish Ingolf-Expedition, Copepoda I, 1915, III, 4. [Pl. VII, Fig.6, b-c].
Male: b, corner of last thoracic segment and urosome (right lateral view); c, left Mx2.


Species Onchocalanus cristatus - Plate 22 of morphological figuresissued from : C. With in The Danish Ingolf-Expedition, Copepoda I, 1915, III, 4. [Pl. VII, Fig.6, d].
Male: serrula 6-dentata and lobus labialis (anterior view).


Species Onchocalanus cristatus - Plate 23 of morphological figuresissued from : H.B. Owre & M. Foyo in Fauna Caribaea, 1, Crustacea, 1: Copepoda. Copepods of the Florida Current. [p.58, Figs.361, 362].
Female (from 14°55'N, 64°50'W): 361, habitus (lateral).
Nota: Forehead with a crest.

Male: 362, last thoracic segment with P5 and urosome (lateral).


Species Onchocalanus cristatus - Plate 24 of morphological figuresissued from : H.B. Owre & M. Foyo in Fauna Caribaea, 1, Crustacea, 1: Copepoda. Copepods of the Florida Current. [p.58, Figs.363-364].
Female: 363, rostrum; 364, P5.


Species Onchocalanus cristatus - Plate 25 of morphological figuresissued from : H.B. Owre & M. Foyo in Fauna Caribaea, 1, Crustacea, 1: Copepoda. Copepods of the Florida Current. [p.25, Fig.109].
Female: Mx2.


Species Onchocalanus cristatus - Plate 26 of morphological figuresissued from : H.B. Owre & M. Foyo in Fauna Caribaea, 1, Crustacea, 1: Copepoda. Copepods of the Florida Current. [p.25, Fig.111].
Female: 111, Mxp.


Species Onchocalanus cristatus - Plate 27 of morphological figuresissued from : H.B. Owre & M. Foyo in Fauna Caribaea, 1, Crustacea, 1: Copepoda. Copepods of the Florida Current. [p.24, Fig.100].
Male: 100, Mx2.


Species Onchocalanus cristatus - Plate 28 of morphological figuresIssued from : C. Razouls in Ann. Inst. océanogr., Paris, 1994, 70 (1). [p.103]. Caractéristiques morphologiques de Onchocalanus cristatus femelle et mâle adultes.
Terminologie et abbréviations: voir à Calanus propinquus.

Compl. Ref.:
Hardy & Gunther, 1935 (1936) (p.163, Rem.); C.B. Wilson, 1950 (p.273); Mazza, 1966 (p.70, as cristalus); Harding, 1966 (p.17, 71); Dunbar & Harding, 1968 (p.319, 321, 323: Rem.); Grice & Hulsemann, 1968 (tab.2); Roe, 1972 (p.277, tabl.1, tabl.2); Deevey & Brooks, 1977 (p.256, tab.2, Station "S"); Kovalev & Shmeleva, 1982 (p.83); Vives, 1982 (p.291); Lozano Soldevilla & al., 1988 (p.58); Razouls & al., 2000 (p.343, Appendix); Holmes, 2001 (p.56); Galbraith, 2009 (pers. comm.); Park & Ferrari, 2009 (p.143, Table 4, Appendix 1, biogeography); in CalCOFI regional list (MDO, Nov. 2013; M. Ohman, comm. pers.)
NZ: 17

Distribution map of Onchocalanus cristatus by geographical zones
Loc:
Antarct. (Atlant. SW), South Georgia, sub-Antarct. (Atlant. SW, Indian, Pacif. SE, SW), Brazil, G. of Guinea, off Morocco-Mauritania, Canary Is., off Madeira, Portugal, off W Cape Finisterre, Bay of Biscay, Azores, Caribbean Sea, Florida, off Bermuda: Station "S" (32°10'N, 64°30'W), Sargasso Sea, S Strait of Davis, ? Arct.: Fletcher's Ice Is. (in Dunbar & Harding, 1968), S Iceland, off W Ireland, W Medit. (Algiers Bay), Indonesia-Malaysia, Philippines, China Seas (South China Sea), Japan (Izu region), S Australia, Tasman Sea, New Zealand, British Columbia (rare), California, off NE Easter, off Juan Fernandez Is., S Chile
N: 36
Lg.:
(1) F: 7,3; (3) F: 6,35; (4) M: 6,2; (5) F: 6,6; (7) F: 8,15; 7,5; M: 6,5; (9) F: 6,65; M: 5,6; (15) F: 7,75-7,16; M: 6,5; (17) F: 6,5; (64) F: 6,9; (199) F: 7,36-5,32; (867) F: 6,3; M: 5,8; {F: 5,32-8,15; M: 5,60-6,50}
Rem.: Meso-bathypelagic.
Sampling depth (Antarct., sub-Antarct.) : 0-2000 m. Sargasso Sea: 1000-2000 m (Deevey & Brooks, 1977, station "S");
The sizes of females show great differences: from 5 to 8.5 mm.
This species is closely related to O. trigoniceps.
For Markhaseva & Kosobokova (1998, p.51) the form cited by Harding (1966) and Dunbar & Harding (1968) would be a different species: Onchocalanus cristogerens.
W. Zhang confirms the presence of this species in the Chinese Seas (comm. pers. 2006).
Last update : 28/01/2017
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