Species Card of Copepod
Calanoida ( Order )
    Arietelloidea ( Superfamily )
        Nullosetigeridae ( Family )
            Nullosetigera ( Genus )
Nullosetigera impar  (Farran, 1908)   (F,M)
Syn.: Phyllopus bidentatus : Wolfenden, 1904 (p.124, fig.M); T. Scott, 1894 b (part., p.74, fig.28: F); Farran, 1905 (part., p.45, fig.20: F, no M);
Phyllopus impar Farran, 1908 b (p.84, figs.F,M); A. Scott, 1909 (p.149, figs.F,M, Rem.); Wolfenden, 1911 (p.328, fig.F); Sars, 1925 (p.340, figs.F,M); Farran, 1926 (p.291); Lysholm & Nordgaard, 1921 (p.27); Rose, 1933 a (p.245, figs.F,M); Jespersen, 1934 (p.117); 1940 (p.65); Lysholm & al., 1945 (p.40); Sewell, 1947 (p.236); 1948 (p.331, 505, 522, 533, 548); C.B. Wilson, 1950 (p.288); Marques, 1953 (p.119); Grice, 1963 a (p.496); Tanaka, 1964 c (p.238, figs.F,M, Rem.); Vervoort, 1965 (p.155, Rem.); Grice & Hulsemann, 1965 (p.225); Owre & Foyo, 1967 (p.91, figs.F,M); Grice & Hulsemann, 1967 (p.19); Park, 1970 (p.478); Roe, 1972 (p.277, tabl.1, tabl.2); 1972 c (p.1036); Björnberg, 1973 (p.349, 388); Deevey & Brooks, 1977 (p.156, tab.2, Station "S"); Vives & al., 1975 (p.52, tab.II, XII); Stephen & Rao, 1980 (p.244); Vives, 1982 (p.294); Roe, 1984 (p.359); Lozano Soldevilla & al., 1988 (p.60); Heinrich, 1990 (p.19); Shih & Young, 1995 (p.67); Chihara & Murano, 1997 (p.862, Pl.143,144: F,M); Bradford-Grieve & al., 1999 (p.884, 950, figs.F,M)
Soh & al., 1999 (p.1583, fig.12: chart, phylogenetic relationships); Boxshall & Halsey, 2004 (p.150); Vives & Shmeleva, 2007 (p.389, figs.F,M, Rem.)
Species Nullosetigera impar - Plate 1 of morphological figuresissued from : O. Tanaka in Publs Seto Mar. Biol. Lab., 1964, XII (3). [p.238, Fig.224]. As Phyllopus impar.
Female (from Izu region, Japan): a, habitus (dorsal); b, last thoracic segment and urosome (right lateral side); c, last thoracic segment and genital somite (left lateral side); d, P5.
Nota: Cephalothorax 2.00 mm; abdomen 0.88 mm.
Last thoracic segment asymmetrical; right side more produced posteriorly and pointed at the apex.
Abdominal segments and caudal rami in the proportional lengths 35 : 17 : 14 : 18 : 16 = 100.
Caudal rami 1.6 times as long as wide.
Genital segment inflated on each side of the lateral margin and slightly asymmetrical; right side more remarkable.
A1 extends about to the end of the last thoracic segment.

Male: e, right P5; f, left P5.
Nota: Cephalothorax 2.01 mm; abdomen 0.90 mm.
The last thoracic segment symmetrical, not pointed at the lateral distal margin.
A1 extends about to the distal margin of the cephalothorax.
P5 resembles that of helgae but the distal segment of the left leg differs in shape; in helgae the tooth of the distal segment is distinctly separated from the distal segment but in impar there is no distinct demarcation between the tooth and the segment.; the outer marginal claw is straight (as figured by Sars); the lamellous plate on the inner margin of the 2nd segment is narrow and has a small denticle on the distal margin. In the right leg the process on the inner proximal margin of the 3rd segment is slender and long.

Species Nullosetigera impar - Plate 2 of morphological figuresIssued from : G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl.CXXIII, figs.1-17]. As Phyllopus impar.
Female: 1, Female (lateral right side); 2, idem (dorsal); 3, forehead, with labrum (lateral); 4, idem (ventral view); 5, A2; 6, Md; 7, Mx1; 8, Mx2; 9, Mxp; 10, P1; 11, P3; 12, endopod of P4; 13, P5; 14, anal segment and caudal rami (dorsal).

Male: 15, habitus (dorsal); 16, left P5; 17, right P5.

Species Nullosetigera impar - Plate 3 of morphological figuresissued from : A. Scott in Siboga-Expedition, 1909, XIX a. [Plate XLV, Figs.10-18]. As Phyllopus impar.
Female (from Celebes Sea, Molucca Passage, Halmahera Sea): 10, habitus (dorsal); 11, forehead (lateral); 12, last thoracic and genital segments (left side); 13, idem (right side); 14, A1; 15, P5.

Male: 16, urosome (dorsal); 17, left A1; 18, P5.

Species Nullosetigera impar - Plate 4 of morphological figuresissued from : R.N. Wolfenden in Die Marinen Copepoden der Deutschen Südpolar-Expedition 1901-1903, 1911. [p.328, Fig.66]. As Phyllopus impar.
Female: posterior part cephalothorax and urosome (lateral, right side).

Species Nullosetigera impar - Plate 5 of morphological figuresissued from : R.N. Wolfenden in Die Marinen Copepoden der Deutschen Südpolar-Expedition 1901-1903, 1911. [Pl.XXXVI, Fig.2]. As Phyllopus impar.
Female: 2, habitus (dorsal).

Species Nullosetigera impar - Plate 6 of morphological figuresissued from : H.Y. Soh, S. Ohtsuka, H. Imabayashi & H.-L. Suh, 1999, 33. [p.1594, Fig.8, A].
Female: A, genital double-somite (ventral).
Scale bar 0.100 mm.

Species Nullosetigera impar - Plate 7 of morphological figures issued from : G.P. Farran in Fish. Ire. Sci. Invest., 1906, II [1908]. [Pl. IX, Figs.1-4]. As Phyllopus impar.
Female (from W Ireland): 1, habitus (dorsal); 2, last thoracic segment and urosome (lateral).

Male: 3, left P5; 4, right P5.

Species Nullosetigera impar - Plate 8 of morphological figuresissued from : H.B. Owre & M. Foyo in Fauna Caribaea, 1, Crustacea, 1: Copepoda. Copepods of the Florida Current. 1967. [p.17, Fig.48]. As Phyllopus impar.
Female: 48, P5.

Compl. Ref.:
Lapernat, 2000 (tabl.3, 4); Holmes, 2001 (p.15, Rem.); Galbraith, 2009 (pers. comm.); Medellin-Mora & Navas S., 2010 (p.265, Tab. 2)
NZ: 12

Distribution map of Nullosetigera impar by geographical zones
Species Nullosetigera impar - Distribution map 2issued from : H.Y. Soh, S. Ohtsuka, H. Imabayashi & H.-L. Suh in J. Nat. Hist., 1999, 33. [p.1599, Fig.12].
Geographical distribution of Nullosetigera mutica (white triangle), Nullosetigera impar (black triangle), Nullosetigera bidentata (black circle) and Nullosetigera helgae (white square).
Angola, G. of Guinea (off Ghana), off E St. Paul Is., off NW Cape Verde Is., off Mauritania, Canary Is., off Morocco-Mauritania, off Madeira, Azores, Portugal, off W Cape Finisterre, Ibero-moroccan Bay, Bay of Biscay, Caribbean Sea, Caribbean Colombia, Florida, off Bermuda (Station "S"), Sargasso Sea, Iceland (S & W), Strait of Denmark, W Ireland, G. of Oman, Indian, Indonesia-Malaysia, Philippines, Viet-Nam (Cauda Bay), China Seas (South China Sea), Japan, off British Columbia (rare), off Peru, Pacif. (SE tropical), N Chile
N: 34
(1) F: 2,7; (5) F: 3; M: 2,7; (10) F: 2,2; (16) F: 2,85-2,65; M: 2,8-2,62; (24) F: 3-2,65; M: 2,95; (38) F: 2,88-2,64; (75) F: 2,93; (120) F: 2,88; M: 2,91; (199) F: 2,81-2,6; M: 2,58-2,28; {F: 2,20-3,00; M: 2,28-2,95}
Rem.: bathypelagic. Sargasso Sea: 500-2000 m (Deevey & Brooks, 1977, Station "S");
Last update : 24/01/2015
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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 21, 2024]

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