Species Card of Copepod
Calanoida ( Order )
    Calanoidea ( Superfamily )
        Paracalanidae ( Family )
            Delibus ( Genus )
Delibus nudus  (Sewell, 1929)   (F,M)
Syn.: Paracalanus nudus Sewell, 1929 (p.76, Descr.F, figs.F); 1948 (p.323, 429); Tanaka, 1960 (p.26, figs.F); Vervoort, 1962 a (p.395, 396); De Decker & Mombeck, 1964 (p.13); Fleminger, 1967 a (tabl.1); Corral Estrada, 1970 (p.95, figs.F,M); Corral Estrada & Munoz, 1974 (p.9); Greze & Bileva, 1979 (p.4); Vives, 1982 (p.290); Guangshan & Honglin, 1984 (p.118, tab.); Lozano Soldevilla & al., 1988 (p.57); Shih & Young, 1995 (p.71); Noda & al., 1998 (p.55, Table 3, occurrence); Hwang & al., 2006 (p.943, tabl. I); Dur & al., 2007 (p.197, Table IV); Kesarkar & Anil, 2010 (p.405, Table 2);
Acrocalanus indicus Tanaka, 1960 (p.28, Descr.M, figs.M); Chen & Zhang, 1974 (p.107, figs.M); Shih & Young, 1995 (p.71); Lo & al.*, 2004 (p.218, fig.6); Lo & al., 2004 (p.468, tab.2); Dur & al., 2007 (p.197, Table IV);
Delius nudus : Andronov, 1972 b (p.597, figs.F,M); Hiromi,1981 (p.160, figs.F, Rem.); 1987 (p.154); Chihara & Murano, 1997 (p.847, Pl.133: F,M); Bradford-Grieve & al., 1999 (p.877, 910, figs.F,M); Dur & al., 2007 (p.197, Table IV); W. Zhang & al., 2010 (pers. comm.);
Ref. compl.: Kovalev & Shmeleva, 1982 (p.82); Madhupratap & Haridas, 1986 (p.105, tab.1); Ueda & al., 2000 (tab.1); Uysal & al., 2002 (p.17, tab.1); Rezai & al., 2004 (p.489, tab.2); Prusova & Smith, 2005 (p.75). Khelifi-Touhami & al., 2007 (p.327, Table 1); Selifonova & al., 2008 (p.305, Tabl. 2); Ohtsuka & al., 2008 (p.115, Table 5); Fazeli & al., 2010 (p.153, Table 1); Selifonova, 2011 a (p.77, Table 1, alien species in Black Sea); Hsiao & al., 2011 (p.317, Table 2, indicator of seasonal change); Tseng L.-C. & al., 2011 (p.47, Table 2, occurrences vs mesh sizes); Johan & al., 2012 (2013) (p.1, Table 1)
Andronovius nudus : Özdikmen, 2008 (p.266).
Ref.:
Vives & Shmeleva, 2007 (p.963, figs.F,M, Rem.)
Species Delibus nudus - Plate 1 of morphological figuresissued from : J. Corral Estrada in Tesis Doct., Univ. Madrid, A-129, Sec. Biologicas, 1970. [Lam.20]. As Paracalanus nudus.
Female (from Canarias Is.): 1, habitus (lateral right side); 2, idem (dorsal); 3, posterior part cephalothorax with P5 and urosome (lateral left side); 4, P1; 5, P2; 6, P3; 7, P4; 8, P5; 9, P5 (another specimen).


Species Delibus nudus - Plate 2 of morphological figuresissued from : J. Corral Estrada in Tesis Doct., Univ. Madrid, A-129, Sec. Biologicas, 1970. [Lam.21]. As Paracalanus nudus.
Male: 1, habitus (lateral left side); 2, idem (dorsal); 3, posterior part cephalothorax with P5 and1st urosomal segment (lateral right side); 4, A1; 5, P1; 6, P2; 7, P3; 8, P4; 9, P5.


Species Delibus nudus - Plate 3 of morphological figuresissued from : R.B.S. Sewell in Mem. Indian Mus., 1929, X. [p.77, Fig.39]. As Paracalanus nudus.
Female (from N Indian): a, habitus (dorsal); b, idem (lateral right side); c, last thoracic margin and urosome (lateral right side); d, genital segment (ventral); e, P1; f, P2; g, P3; h, P4; i, P5.


Species Delibus nudus - Plate 4 of morphological figuresissued from : Q.-c. Chen & S.-z. Zhang in Studia Marina Sinica, 1974, 9. [Pl.3, Figs.23-32]. As Paracalanus nudus.
Female (from South China Sea): 23, habitus (dorsal); 24, idem (lateral right side); 25, P2; 26, P3; 27, P4; 28, P5; 29, 30, P5 (other specimens).

Male: 31, habitus (dorsal); 32, P5.


Species Delibus nudus - Plate 5 of morphological figuresissued from : Q.-c. Chen & S.-z. Zhang in Studia Marina Sinica, 1974, 9. [Pl.4, Fig.41-46]. As Acrocalanus indicus.
Male (from South China Sea): 41, habitus (dorsal); 42, idem (lateral right side); 43, P1; 44, P2; 45, P3; 46, P5.


Species Delibus nudus - Plate 6 of morphological figuresissued from : V.N. Andronov inZool. Zh., 1972, 51 (4). [p.598, Figs.1-22]. As Delius nudus..
Female (from Atlantic): 1, habitus (dorsal); 2, rostrum (frontal view); 3, habitus (lateral left side); 4, P1; 5, P2; 6, P3; 7, P4; 8, P5; 9 idem (lateral); 10, genital segment (ventral); 11, idem (lateral left side); 12, A2; 13, Md (mandibular palp); 14, Md (masticatory edge); 15, Mx1; 16, Mx2; 17, Mxp.
Nota: Only left P5 with 2 segments. The outer edge of the 2nd and 3rd segments of P2-P4 exopodites smooth.

Male: 18, habitus (dorsal); 19, idem (lateral left side); 20, P5; 21, rostrum (frontal view); 22, A1.
Nota: Only left P5, with 5 segments.


Species Delibus nudus - Plate 7 of morphological figuresissued from : J. Hiromi in Bull. Plankton Soc. Japan, 1981, 28 (2). [p.161, Fig.6]. As Delius nudus.
Female (from Japan): a-b, habitus (dorsal and lateral, respectively); c-g, P1 to P5.
Scale bars 0.100 mm.


Species Delibus nudus - Plate 8 of morphological figuresissued from : K.S. Kesarkar & A.C. Anil in J. mar. Biol. Ass. UK, 2010, 90 (2); [p.405, Table 2]. As Paracalanus nudus. After Sewell, 1929.
Characteristics of females.


Species Delibus nudus - Plate 9 of morphological figuresissued from : K.S. Kesarkar & A.C. Anil in J. mar. Biol. Ass. UK, 2010, 90 (2); [p.407, Fig.5, K]. As P. nudus.
Female: K, P5.


Species Delibus nudus - Plate 10 of morphological figuresIssued from : O. Tanaka in Spec. Publs. Seto mar. biol. Lab., 10, 1960 [Pl. VIII, 1-8]. As Paracalanus nudus.
Female (from 18°54'S, 60°39'E): 1-2, habiyus (dorsal and lateral, respectively); 3, genital segment (ventral); 4, P1; 5, P2; 6, P3; 7, P4; 8, P5
P1 to P5 at the same scale.

Nota: Cephalothorax and abdomen in the proportional lengths 77 to 23.
Head and 1st thoracic segment fused, 4th and 5th thoracic segments fused.
Rostrum composed of 2 spines directing postero-ventrally.
Posterior thoracic margin narrowly rounded, furnished with a tuft of long hairs which direct backwardly.
Abdomen 4-segmented; segments and caudal rami in the proportional lengths 32 : 12 : 8 : 24 : 24 = 100.
Genital segment wider than long, with the proportion 19 to 16; the ventral surface produced below, receptacles small.; the lateral surface of the segment is furnished with 2 rows of spinules.
Caudal rami long, about 2.7 times as long as broad.
The swimming legs and P5 as described and figured by Sewell. There is no spinule on the outer margin of the exopodal 3rd segment of P2 to P4.


Species Delibus nudus - Plate 11 of morphological figuresIssued from : O. Tanaka in Spec. Publs. Seto mar. biol. Lab., 10, 1960 [p.27].
. As Paracalanus nudus.Female: Proportional lengths of segments of A1.

Nota: A1 25-segmented, extends to the level of the anal segment


Species Delibus nudus - Plate 12 of morphological figuresIssued from : O. Tanaka in Spec. Publs. Seto mar. biol. Lab., 10, 1960 [Pl. IX, 5-9]. As Acrocalanus indicus.
Male (from 18°54'S, 60°39'E): 5-6, habitus (dorsal and lateral, respectively); 7, P1; 8, P2; 9, left P5.
Figures 7-9 at the same scale.

Nota: Cephalothorax and abdomen in the proportional lengths 73 to 27.
Rostral spine small.
Abdomen 5-segmented; segments andcaudal rami in the proportional lengths 22 : 22 : 13 : 11 : 13 : 19 = 100.
Genital segment 1.6 times as wide as long.
Caudal rami about 2 times as long as broad.
Right P5 absent. left leg long, 5-segmented; segments in the proportional lengths 32 : 13 : 23 : 20 : 13 = 100.; 1st segment very voluminous, 4th segment with a small inner distal spine, 5th segment with 2 apical spines.


Species Delibus nudus - Plate 13 of morphological figuresIssued from : O. Tanaka in Spec. Publs. Seto mar. biol. Lab., 10, 1960 [p.28]. As Acrocalanus indicus.
Male: Proportional lengths of segments of A1.

Nota: A1 20-segmented, extends to the level of the genital segment. Segments 10-11-12, and 13 furnished with short hairs on the posterior margin.


Species Delibus nudus - Plate 14 of morphological figuresIssued from : V.N. Andronov in Russian Acad. Sci. P.P. Shirshov Inst. Oceanol. Atlantic Branch, Kaliningrad, 2014. [p.41, Fig.11, 11]. Delibus nudus after Andronov, 1972.
11, P5 female.


Species Delibus nudus - Plate 15 of morphological figuresIssued from : V.N. Andronov in Russian Acad. Sci. P.P. Shirshov Inst. Oceanol. Atlantic Branch, Kaliningrad, 2014. [p.73, Fig.19: 17 ]. Delibus nudus after Andronov, 1972 c.
Male P5.

Compl. Ref.:
Humphrey, 2008 (p.83: Appendix A); Cornils & al., 2010 (p.2076, Table 3, Fig.5); Uysal & Shmeleva, 2012 (p.909, Table I); Jang M.-C & al., 2012 (p.37, abundance and seasonal distribution); DiBacco & al., 2012 (p.483, Table S1, ballast water transport); Cornils & Blanco-Bercial, 2013 (p.861, Table 1, molecular analysis, figs.3, 4, 5); in CalCOFI regional list (MDO, Nov. 2013; M. Ohman, comm. pers.); Lidvanov & al., 2013 (p.290, Table 2, % composition); Hirai & al., 2020 (p.1, Fig. 5: cluster analysis (OTU), spatial distribution); Bode & al., 2018 (p.66, fig.5, vertical distribution %, Rem).
NZ: 10

Distribution map of Delibus nudus by geographical zones
Loc:
South Africa (E), Morocco-Mauritania, Canary Is., Caribbean Sea, Medit. (W Basin, Gulf of Annaba, Lebanon Basin), W Black Sea, Gulf of Oman, Arabian Sea, Indian, Straits of Malacca, Sarawak: Bintulu coast, SW Celebes, Pacif. (W equatorial), China Seas (East China Sea, South China Sea), Taiwan Strait, Taiwan (SW, Tapong Bay, Danshuei Estuary), Korea Strait, S Japan (Kuchinoerabu Is.), Japan, California

Data from Cornils & Blanco-Bercial (2013): 01°00'S; 09°00'W (W Guinea Basin).
N: 42
Lg.:
(29) F: 0,48-0,45; (66) F: 0,52; M: 0,43; (148) F: 0,539-0,526; (180) F: 0,53-0,48; M: 0,47-0,44; (338) M: 0,46-0,43; (429) F: 0,7-0,58 [Atlantic]; 0,56-0,52 [Indian]; M: 0,52-0,46 [Atlantic]; 0,46-0,42 [Indian]; (1047) F: 0,4 [Black Sea]; {0,40-0,70; M: 0,42-0,52}

The mean female size is 0.535 mm (n = 11; SD = 0.0661), and the mean male size is 0.454 (n = 9; SD = 0.0300). The size ratio (male : female) is 0.839 (n = 3; SD = 0.5740) or ± 84 %. The sex ratio (female : male) is temporary 1.75.
Rem.: epipelagic.
In Vives & Shmeleva (2007, p.963), the name of the genus Delius was changed in Delibus (nom praec.)
Last update : 04/12/2020
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