Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Scolecitrichidae ( Family )
            Scottocalanus ( Genus )
Scottocalanus rotundatus  Tanaka, 1961   (F,M)
Syn.: Scottcalanus rotundatus Tanaka, 1961 a (p.147, figs.F,M)
Ref.:
Tanaka, 1969 (p.275); Park, 1983 (p.198, 199); Bradford & al., 1983 (p.116)
Species Scottocalanus rotundatus - Plate 1 of morphological figuresissued from : O. Tanaka in Publ. Seto Mar. Biol. Lab., 1961, IX (1). [p.148, Fig. 109]. As Scottcalanus rotundatus.
Female (from Izu Region): a, habitus (dorsal); b, forehead (lateral); c, last thoracic segment and urosome (lateral, left side); d, rostrum; e, genital field; f, Mx1; g, P2; h, P3; i, P5.
- Head incompletely separates from the thopracic segments, as are the 4th from the 5th.
- Head without median crest.
- The rostral spine is about as long as the depth excavation.
- Abdomen about 5 times in the length of the cephalothorax.
- Urosome with 4 segments; segments and caudal ramus in the proportional lengths 46 : 20 : 14 : 5 : 51 = 100.
- Caudal rami about as long as wide.
- A1 23-segmented, extends to the end of the caudal rami.
- Exopod of A2 1.3 times as long as the endopod.

Male: j, last thoracic segment and urosome (lateral; k, distal segments of left P5.
- Lateral corner of the last thoracic segment narrowly rounded at the azpical portion.
- Urosomal segments and caudal ramus in the proportional lengths 19 : 25 : 21 : 19 : 8 : 8 = 100.
- A1 20 segments, segments 8-13 fused, 24 and 25 well separated.
- Exopod of A2 1.5 times long as the endopod.
- Md with a robust 2nd basal segment and a narrow biting part. Maxillae and Mxp as those of the female.
- P1 to P4 as those of the female.
- The 1st segment of the exopod of the right P5 has a small process on the distal inner margin. The distal segment of the exopod of the left P5 has a pad of stiff hairs and 2 strong curved spines (fig. k).


Species Scottocalanus rotundatus - Plate 2 of morphological figuresissued from : O. Tanaka in Publ. Seto Mar. Biol. Lab., 1961, IX (1). [p.149]. As Scottcalanus rotundatus.
Female: Segments of A1 in the proportional lengths.


Species Scottocalanus rotundatus - Plate 3 of morphological figuresissued from : O. Tanaka in Publ. Seto Mar. Biol. Lab., 1961, IX (1). [p.149]. As Scottcalanus rotundatus.
Male: Segments of A1 in the proportional lengths.

Compl. Ref.:
Furuhashi, 1966 a (p.295, vertical distribution in Kuroshio region, Table 10); Shih & Young, 1995 (p.74); Kuriyama & Nishida, 2006 (p.300: Tab.II, fig.7, vertical distribution); Sano & al., 2013 (p.11, Table 2, fig.5, feeding habits)
NZ: 3

Distribution map of Scottocalanus rotundatus by geographical zones
Loc:
Japan (Izu, Sagami Bay, SW Bösö), Philippines, China Seas (South China Sea)
N: 6
Lg.:
(105) M: 4,43; 108) F: 4,07; M: 4,38; (1000) F: 4,1 ± 0,1; {F: 4,0-4,07; M: 4,38}
Rem.: mesopelagic. 82-301 m at Station N-1 (SW Bösö, E middle Japan from Furuhashi (1966 a).
After Tanaka (1961 a, p.150) the male of S. rotundatus differs from S. investigatoris in its small size and in having a small process on the 1st segment of the right P5.

After Sano & al. (2013, p.14, Table 2) atomic C:N (mean ± SD) = 5.0 ±0.5, n = 3, in Sagami Bay (21-27 April 2009).
Last update : 18/07/2019
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Razouls C., de Bovée F., Kouwenberg J. et Desreumaux N., 2005-2019. - Diversity and Geographic Distribution of Marine Planktonic Copepods. Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed July 23, 2019]

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