Species Card of Copepod
Calanoida ( Order )
    Arietelloidea ( Superfamily )
        Nullosetigeridae ( Family )
            Nullosetigera ( Genus )
Nullosetigera mutica  (Sars, 1907)   (F,M)
Syn.: Phyllopus muticus Sars, 1907 a (p.26, Rem.F); 1925 (p.345, figs.F); Sewell, 1947 (p.237, Descr.M, figs.M); 1948 (p.331, 505, 522, 528, 533); C.B. Wilson, 1950, p.289, fig.F); Grice, 1963 a (p.496); Owre & Foyo, 1967 (p.91, figs.F); Grice & Hulsemann, 1967 (p.19, 38, figs.F); Stephen & Rao, 1980 (p.239, tab.1, 2, fig.2); Madhupratap & Haridas, 1986 (p.105, tab.1)
Soh & al., 1999 (p.1590, Redescr.F, figs.F, fig.12: chart, phylogenetic relationships); Boxshall & Halsey, 2004 (p.150); Vives & Shmeleva, 2007 (p.391, figs.F,M, Rem.)
Species Nullosetigera mutica - Plate 1 of morphological figuresissued from : G.D. Grice & K. Huisemann in Proc. U.S. natn. Mus., 1967, 122 (3583). [p.64, Figs.266-269; p.65, Fig.270]. As Phyllopus muticus.
Female (from 22°06'S, 64°55'E): 266, habitus (lateral left side); 267, Mx1; 268, Mx2; 269, P5; 270, habitus (dorsal).

Species Nullosetigera mutica - Plate 2 of morphological figuresIssued from : G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl.CXXIV, figs.10-16]. As Phyllopus muticus.
Female: 10, habitus (dirsal); 11, labrum; 12, labiul; 13, Md (masticatory edge); 14, Mx2; 15, P5; 16, anal segment and caudal rami.

Species Nullosetigera mutica - Plate 3 of morphological figuresissued from : R.B.S. Sewell in The John Murray Expedition, 1933-34, Scientific Reports, VIII (1), 1947. [p.238, Fig.64]. As Phyllopus muticus.
Male (from N Arabian Sea): A, habitus (lateral right side); B, left A1; C, proximal segments of right A1; D, A2; E, Md; F, Mx1; G, Mx2; H, P1; I, P3; J, P5.

Nota: The proportional lengths of the cephalothorax and abdomen as 63 to 37. The proportional lengths of the various segments of the body (cephalon to caudal rami) as 290:113:68:68:100:65:64:61:55:55:61 = 1000. The body is plentifully provided with the openings of numerous cutaneous glands, the first comparatively large multicellular glands that open by large apertures, the esond, small glands composed of only one or two cells, that open by small pores. A1 not reaching as faf as the posterior thoracic margin. Right 24-segmented (segmets 24-25 fused), grasping with the 1 st and 2 nd segments fused, 21-23 fused, and 24-25 fused respectively. In A2 a gland opens on the inner side of the 2nd basal segment near the origin of the marginal setae; and a smaller apertureis situated about the middle of the length of the 1st endopodal segment opposite the origin of the two marginal setae arising from that segment. In Md the biting blade agrees exactly with that of the female as figured by Sars. The maxillae and Mxp agree with those of the female. In P1 a gland opens on the 3rd segment of the exopod near the origin of the 1st marginal spine, and a similar gland opens on the 3rd segment of the endopod; P2 to P4 are plentfully supplied with glands.

Species Nullosetigera mutica - 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, E]. As Phyllopus muticus.
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.

Species Nullosetigera mutica - Plate 5 of morphological figuresissued from : H.Y. Soh, S. Ohtsuka, H. Imabayashi & H.-L. Suh, 1999, 33. [p.1591, Fig.6];
Female (from S Japan): A-B, habitus (dorsal and lateral, respectively); C,genital double-somite (ventral; cp = copulatory pore; sr = seminal receptacle; g = gonopore; o = oviduct); D, left Mx1; E, syncoxa of left Mxp; F, 6th endopodal segment of left Mxp (setation elements on 6th endopodal segment indicated by letters a to d); G, P5.

Species Nullosetigera mutica - Plate 6 of morphological figuresissued from : C.B. Wilson in Bull. U.S. natn Mus., 100, 14 (4). [Pl.15, Fig.189]. As Phyllopus muticus.
Female (from 22°50'S, 97°30'W): 189, P5.

Species Nullosetigera mutica - Plate 7 of morphological figuresissued from : H.B. Owre & M. Foyo in Fauna Caribaea, 1, Crustacea, 1: Copepoda. Copepods of the Florida Current. 1967. [p.92, Fig.651]. As Phyllopus muticus.
Female: 651, P5

NZ: 6

Distribution map of Nullosetigera mutica by geographical zones
Species Nullosetigera mutica - Distribution map 2
Chart of 1996
Species Nullosetigera mutica - Distribution map 3issued from : R. Stephen & T.S.S. Rao in J. Plankton Res., 1980, 2 (2). [p.245, Fig.2].
Distribution of Phyllopus (= Nullosetigera) in the Indian Ocean (open circles indicate the stations selected for the study).
Species Nullosetigera mutica - Distribution map 4issued 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).
off W Canary Is., Caribbean, off S Cape Cod, Indian (Arabian Sea, E Mauricia Is., Bay of Bengal), off E Easter I. (in C.B. Wilson, 1950), S Japan (off Tanega Is., off Honshyu)
N: 10
(1) F: 4,8; (11) M: 5,03; (67) M: 7,21; (769) F: 4,63-4,55; {F: 4,55-4,80; M: 5,03-7,21}
Rem.: The female and the male are described from very distant geographical localities and not reported in a concomitant way.
Grice & Hulsemann (1967, p.38) find a very large female (7,21 mm) at one station (22°06'S, 64°55'E.
Last update : 29/12/2015
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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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