Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Scolecitrichidae ( Family )
            Scolecithricella ( Genus )
Scolecithricella nicobarica  (Sewell, 1929)   (F,M)
Syn.: Scolecithrix nicobarica Sewell, 1929 (p.209, figs.F,M); Tanaka, 1962 (p.36, figs.F,M); Chen & Zhang, 1965 (p.60, figs.F,M); Silas, 1972 (p.647); Bradford, 1973 (p.141); Carter, 1977 (1978) (p.36); Zheng & al., 1982 (p.41, figs.F); Bradford & al., 1983 (p.113); Furuhashi, 1966 a (p.295, vertical distribution in Kuroshio region, Table 10) ; Guangshan & Honglin, 1984 (p.118, tab.); Yoo, 1991 (tab.1); Gopalakrishnan & Balachandran, 1992 (p.167, figs.1, 5, Table 1, 2); Kim & al., 1993 (p.270); Shih & Young, 1995 (p.73); Go & al., 1997 (tab.1); Noda & al., 1998 (p.55, Table 3, occurrence); Lo & al., 2001 (1139, tab.I); Kazmi, 2004 (p.229); Wang & Zuo, 2004 (p.1, Table 2, dominance, origin); Zuo & al., 2006 (p.163: tab.1, 3, fig.9G, spatial abundance, fig.8: stations group); Hwang & al., 2006 (p.943, tabl. I); Dur & al., 2007 (p.197, Table IV); Fernandes, 2008 (p.465, Tabl.2); C.-Y. Lee & al., 2009 (p.151, Tab.2); Sun & al., 2010 (p.1006, Table 2)
Farran, 1936 a (p.97, figs.F); Sewell, 1948 (p.323); Grice & Hulsemann, 1967 (p.17); Fleminger, 1967 a (tabl.1); Vyshkvartzeva, 1999 (2000) (p.234); Soih & al., 2013 (p.102, figs.F,M)
Species Scolecithricella nicobarica - Plate 1 of morphological figuresissued from: Q.-c Chen & S.-z. Zhang in Studia Marina Sinica, 1965, 7. [Pl.18, 8-13]. As Scolecithrix nicobarica.
Female (from E China Sea): 8, habitus (dorsal); 9, idem (lateral right side); 10, right P1 (anterior); 11, left P3 (posterior).

Male: 12, habitus (dorsal); 13, P5 (posterior).

Species Scolecithricella nicobarica - Plate 2 of morphological figuresissued from : R.B.S. Sewell in Mem. Indian Mus., 1929, X. [p.210, Fig.78]. As Scolecithrix nicobarica. Female (from Nankauri Harbour): a, habitus (dorsal); b, A1; c, P1; d, P2; e, P3; f, P4.

Male: g, P5.

Species Scolecithricella nicobarica - Plate 3 of morphological figuresissued from : Z. Zheng, S. Li, S.J. Li & B. Chen in Marine planktonic copepods in Chinese waters. Shanghai Sc. Techn. Press, 1982 [p.42, Fig.24]. As Scolecithrix nicobarica.
Female: a-b, habitus (dorsal and lateral, respectively); c, P1; d, P3.
Scale bars in mm.

Species Scolecithricella nicobarica - Plate 4 of morphological figuresIssued from : H.Y. Soh, S.Y. Moon & J.H. Wi in Invertebrate Fauna of Korea (eds) Incheon: NIBR, 2013, 21 (28). [p.103, Fig.59].
Female (from Korean waters): A-B, habitus (dorsal and lateral, respectively); C, rostrum; D, A1; E, A2; F, Md; G, Mx1.
Scale bars: A, B = 300 µm; C-E = 10 µm; F, G = 20 µm.

Species Scolecithricella nicobarica - Plate 5 of morphological figuresIssued from : H.Y. Soh, S.Y. Moon & J.H. Wi in Invertebrate Fauna of Korea (eds) Incheon: NIBR, 2013, 21 (28). [p.104, Fig.60].
Female: A, Mx2; B, Mxp; C, P1; D, P2; E, P3; F, P4.
Scale bars: A, B = 20 µm; C-F = 10 µm.

Species Scolecithricella nicobarica - Plate 6 of morphological figuresIssued from : H.Y. Soh, S.Y. Moon & J.H. Wi in Invertebrate Fauna of Korea (eds) Incheon: NIBR, 2013, 21 (28). [p.105, Fig.61].
Male: A-B, habitus (dorsal and lateral, respectively); C, D, A1; E, P5.
Scale bars: A, B = 300 µm; C, D = 20 µm; E = 10 µm.

Species Scolecithricella nicobarica - Plate 7 of morphological figuresissued from : O. Tanaka in Publ. Seto Mar. Biol. Lab., 1962, X (1). [p.36, Fig.127]. As Scolecithrix nicobarica.
Female (Sagami Bay): a, habitus (dorsal); b, head (lateral left side); c, last thoracic segment and urosome (lateral left side); d, P1; e, P2; f, endopod of P3; g, basal segments of P4.

Male: h, last thoracic segment and urosome (lateral left side); i, P5.

Nota Female:
- Cephalothorax about 4.13 times the abdomen length.
- Head and 1st pediger segment fused, 4th and 5th pedigers fused, line of fusion not observed.
- Posterolateral corners of the last thoracic segment slightly indented on margin.
- Rostrum with 2 strong spines terminating into fine point.
- Abdomen 4-segmented; segments and caudal rami in the proportional lengths 43 : 18 : 18 : 9 : 12 = 100.
- Genital segment not swollen ventrally.
- Anal segment short.
- Caudal rami as long as wide.
- A2 20-segmented, extends to the posterior margin of the 2nd abdominal segment. Segments 1-2, 8-9-10, 24-25 are fused., segments 12 and 13 partially fused.
- A2 exopod slightly longer than endopod (7 : 5).
- Mx1 with 7 long and 2 short setae on outer lobe; 7 setae on exopod; 6 setae on endopod; 3 setae on the 2nd basal; 3 setae on the 3rd inner lobe; 2 setae on the 2nd inner lobe; 9 setae on the 1st inner lobe (= arthrite).
- Mx2 with 3 long vermiform and 5 bud-like sensory filaments on endopod.
- Mxp with the 1st basal segment slightly shorter than the 2nd.
- P1 exopod 3-segmented and endopod 1-segmented; exopodal segment 1 without marginal spine; coxa with a row of spinules.
- P2 with exopod 3-segmented and endopod 2-segmented; the 2nd and 3rd exopodal segments and the 2nd endopodal segment are furnished with rows of spinules on the posterior surface; coxa xery finely denticulated on proximal half of the outer margin; basis with a small spine on inner margin about the middle.
- P3 and P4 with exopod and endopod each 3-segmented.
- P4 with coxa finely serrated on outer distal margin; there is a small protuberance near the outer distal margin; the segment has a transverse row of spinules at the base of the small inner marginal seta on posterior surface; basis with a rounded process near the inner distal margin where the endopod articulates.
- P5 absent.

Nota Male (from Suruga Bay):
- Cephalothorax about 2.95 the abdomen length.
- Urosome 5-segmented; abdominal segments and caudal rami in the proportional lengths 17 : 33 : 17 : 21 ; 5 : 7 = 100.
- Caudal rami as long as wide.
- A1 18-segmented on the left side, reaches back to the distal end of the 2nd abdominal segment; segments 8-13, 20-21 and 24-25 fused, segment 12 and 13 fused on the posterior margin.
- A2 exopod slightly longer than endopod.
- Md robust.
- Mx1 ith 7+2 setae on outer lobe.
- Mx2 with long vermiform filaments on endopod.
- Mxp robust.
- P1 to P4 as those of the female.
- P5 reaches back to the caudal rami; left leg with endopod very small; exopod 3-segmented, the distal segment carries a thin lamellous plate on the apex. Endopod of right leg triangular in shape, carries a slender spine at apex; distal segment of exopod slender.

Compl. Ref.:
Brinton & al., 1986 (p.228, Table 1); Chen Y.-Q., 1986 (p.205, Table 1: abundance %, Table 2: vertical distribution); Madhupratap & Haridas, 1986 (p.105, tab.1); Suarez-Morales & Gasca, 1998 a (p.111); Kuriyama & Nishida, 2006 (p.300: Tab.II; p.309: Tab.III, fig.7, 10, vertical distribution); in CalCOFI regional list (MDO, Nov. 2013; M. Ohman, comm. pers.).
NZ: 6

Distribution map of Scolecithricella nicobarica by geographical zones
Species Scolecithricella nicobarica - Distribution map 2issued from : T.C. Gopalakrishnan & T. Balachandran in Oceanogr. Indian Ocean, 1992. [p.171, fig.5, A]. As Scolecithrix nicobarica.
Distribution of Scolecithricella nicobarica in the Indian Ocean.
Nota: Main occurences between 25° N - 20° S.
South Africa (E), Natal, Indian (W & N), Pakistan, Bay of Bengal, Nicobar Is.: Nankauri Harbour, China Seas (Yellow Sea, East China Sea, South China Sea), Taiwan, Okinawa, S Korea, Japan, Sagami Bay, Kuchinoerabu Is., Pacif. (W equatorial), Australia (Great Barrier), California, Gulf of California
N: 32
(29) F: 1,08; M: 1,08; (34) F: 1,37-1,35; (117) F: 1,446; M: 1,5; (290) F: 1,45-1,5; M: 1,4-1,5; (1000) F: 1,5 ± 0.0; M: 1,5 ± 0.0; (1023) F: 1,45; (1174) F: 1,21-1,23; M: 1,15-1,17; {F: 1,08-1,50; M: 1,08-1,50}
Rem.: epi-mesopelagic. 298-526 m at Station N-1 (SW Bösö, E middle Japan) from Furuhashi (1966 a).
After Tanaka (1962, p.38) the specimen from the Izu region (Japan) differs from Sewell in the structure of the A2.
Last update : 18/01/2021
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