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Calanoida ( Order ) |
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Clausocalanoidea ( Superfamily ) |
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Scolecitrichidae ( Family ) |
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Scottocalanus ( Genus ) |
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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) |  issued 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).
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 issued 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.
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 issued 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.293, 300: Tab.II, fig.7, vertical distribution); Sano & al., 2013 (p.11, Table 2, fig.5, feeding habits) | | | | NZ: | 3 | | |
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Distribution map of Scottocalanus rotundatus by geographical zones
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| | | | | | | 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; M: 4,3 ±0,1; {F: 4,0-4,07; M: 4,20-4,43} | | | | 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 : 18/01/2021 | |
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 Any use of this site for a publication will be mentioned with the following reference :
Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2025. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed October 31, 2025] © copyright 2005-2025 Sorbonne University, CNRS
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