Species Card of Copepod
Calanoida ( Order )
    Arietelloidea ( Superfamily )
        Augaptilidae ( Family )
            Pseudhaloptilus ( Genus )
Pseudhaloptilus eurygnathus  (Sars, 1920)   (F)
Syn.: Pachyptilus eurygnathus Sars, 1920 c (p.18, Rem.F); 1925 (p.321, figs.F); Rose, 1933 a (p.236, figs.F); Jespersen, 1934 (p.115); 1940 (p.63); Vervoort, 1957 (p.140, Rem.); Tanaka, 1964 b (p.90, figs.F); Tanaka & Omori, 1971 (p.267); Roe, 1984 (p.359); Bradford-Grieve,1999 b (p.67, figs.F, Rem., figs.173, 190); Vives & Shmeleva, 2007 (p.261, figs.F, Rem.);
Ref. compl.: Sewell, 1948 (p.330, 505, 522, 528, 531, 533, 538); C.B. Wilson, 1950 (p.274); De Decker & Mombeck, 1964 (p.13); Harding, 1966 (p.17, 79, 84); Grice & Hulsemann, 1967 (p.19); 1968 (tab.2); Dunbar & Harding, 1968 (p.319); Roe, 1972 (p.277, tabl.1, tabl.2); Björnberg, 1973 (p.348, 388); Deevey & Brooks, 1977 (p.156, tab.2: as erygnathus, Station "S"); Vives, 1982 (p.294); Lozano Soldevilla & al., 1988 (p.60); Hopkins & Torres, 1988 (tab.1); Heinrich, 1990 (p.19); Padmavati & al., 1998 (p.347); Suarez-Morales & Gasca, 1998 a (p108); Voronina & Kolosova, 1999 (p.71); Razouls & al., 2000 (p.343, Appendix); Hsiao & al., 2004 (p.325, tab.1); Hwang & al., 2007 (p.25); Gaard & al., 2008 (p.59, Table 1, N Mid-Atlantic Ridge);
Pseudhaptilus eurygnathus : Galbraith, 2009 (pers. comm.);
no Pachyptilus eurygnathus : Sewell, 1947 (p.239); Park & Ferrari, 2009 (p.143, Table 4, Appendix 1, biogeography)
Boxshall & Hasley, 2004 (p.68, Rem.).
Species Pseudhaloptilus eurygnathus - Plate 1 of morphological figuresissued from : O. Tanaka in Publs Seto Mar. Biol. Lab., 1964, XII (1). [p.91, Fig.219]. As Pachyptilus eurygnathus.
Female: a, habitus (dorsal); b, forehead (left lateral side); c, last thoracic segment and urosome (left lateral side); d, masticatory edge of Md; e, P1; f, P5.
Nota: The urosome segments and furca are in the proportional lengths as 55:9:6:12:18 = 100. The furcal rami as long as wide. A1 exceeds the end of the furca by distal 5 segments.

Species Pseudhaloptilus eurygnathus - Plate 2 of morphological figuresissued from : J.M. Bradford-Grieve in The Marine Fauna of New Zealand: Pelagic Calanoid Copepoda. National Institute of Water and Atmospheric Research (NIWA). NIWA Biodiversity Memoir, 111, 1999. [p.67, Fig.38]. As Pchyptilus eurygnathus.
Female: A, habitus (dorsal); B, left Md; C, Mx1; D, P1; E, P5.

Species Pseudhaloptilus eurygnathus - Plate 3 of morphological figuresIssued from : G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl.CXIV, figs.1-13]. As Pachyptilus eurygnathus.
Female: 1, habitus (dorsal); 2, idem (lateral left side); 3,rostrum; 4, A2; 5, Md; 6, Md (masticatory edge); 7Mx1; 8, Mx2; 9, Mxp; 10, P1; 11, P3; 12, P5; 13, posterior part of urosome (dorsal).

Species Pseudhaloptilus eurygnathus - Plate 4 of morphological figuresissued from : R.B.S. Sewell in The John Murray Expedition, 1933-34, Scientific Reports, VIII (1), 1947. [p.166, Fig.44, I]. As Pachyptilus eurygnathus.
Process on the posterior aspect of the 2nd basal segment of P1.
Remarks: The shape of the hook-like or spine-like process shows some variation in different genera, but it is undoubtedly homologous throughout the whole series. The function of this organ is unknown.

Compl. Ref.:
Salah S. & al., 2012 (p.155, Tableau 1); El Arraj & al., 2017 (p.272, table 2, spatial distribution);
NZ: 15

Distribution map of Pseudhaloptilus eurygnathus by geographical zones
Antarct. ( Weddell Sea, Indian), sub-Antarct. (SE Pacif.), South Africa (E), off Mauritania, Cap Ghir (Morocco), Canary Is., Azores, off Madeira, off Lisboa, off W Cabo Finisterre, G. of Mexico, Sargasso Sea, off Bermuda (Sration "S"), W Greenland (Davis Strait, Bay of Baffin), S Iceland, Arct., Fletcher's Ice Is.), Arabian Sea, W Indian, China Seas (South China Sea), Taiwan (S, E), Japan (Izu), SW Bering Is., British Columbia, Pacif. (tropical), off SW Galapagos, off Peru, Pacif. (SE tropical), off Juan Fernandez Is., Chile, New Zealand (SW North Island)
N: 29
(1) F: 4,8; (49) F: 5,9-5,3; (49’) F: 4,7; (69) F: 5; (90) F: 5,05-4,74; (199) F: 4,8; (909) F: 4,9; {F: 4,70-5,90}
Rem.: meso-bathypelagic. Sargasso Sea: 500-1500 m (Deevey & Brooks, 1977, Station "S");
Boxshall & Halsey, 2004 (p.68), building on a non-published work of Soh (1998), consider that Pachyptilus is a junior synonym of Pseudhaloptilus.
Last update : 28/10/2022
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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 May 18, 2024]

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