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Calanoida ( Order ) |
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Clausocalanoidea ( Superfamily ) |
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Aetideidae ( Family ) |
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Aetideus ( Genus ) |
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Aetideus truncatus Bradford, 1971 (F,M) | |
| | | | | | | Ref.: | | | Bradford, 1971 (p.26, figs.F,M); Markhaseva, 1996 (p.24, figs.F,M, Rem.) |  issued from : J.M. Bradford in N.Z. Jl Mar. Freshw. Res., 1971, 5 (1). [p.26, Fig.10]. From NE pacific: 22°59'N, 107°13' W. Female: a, b, rostrum (from two different specimens); c, genital segment and posterior thoracic point (lateral left side); d, habitus (dorsal); e, idem (lateral left side). Nota: Rostrum : Width: Depth ratio = 1.46-1.84 (see fig.5c to A. australis). Head vaulted above mandible and Mx1 (in lateral view). Seminal receptacle with a thick neck joining dorsal and ventral sacs. Mouth parts and swimming legs are identical with those of A. armatus. Male: f, P5; g, 3rd exopod segment of P3; h, habitus (dorsal). Nota: Rostrum absent. Fusion line between thoracic segment 4 and 5 visible dorsally. The terminal exopod spines on P3 with 21 teeth (these teeth appear to be more widely spaced than in A. armatus.
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 issued from : J.M. Bradford in N.Z. Jl Mar. Freshw. Res., 1971, 5 (1). [p.18, Fig.4, b]. [modified C.R] Rostrum width : depth plotted against rostrum depth (c) for Aetideus truncatus. Compare with A. autralis, A. pseudarmatus, A. divergens and A. armatus.
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 issued from : E.L. Markhaseva in Trudy Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.25, Fig.12]. Female (from 12°N, 133°W).
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 Aetideus truncatus female: 1 - Posterior corners of last thoracic segment prolonged into points. 2 - Posterior corners not prolonged into wing-like lobes. Points not reaching the middle of urosomal segment 2. Anterior part of vephalon without crest. 3 - Basipodite of right P1 without external tooth-like distally projection distally. Coxopodite of P4 usually with spinules near the base of internal seta. 4 - Points of posterior corners not reaching posterior border of genital segment. 5 - Rostrum small, rami short, widely spaced. A1 shorter than body.
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 Aetideus truncatus male: 1 - Last thoracic segment with points. 2 - Posterior corners of last thoracic segment not exceeding posterior border of urosomal segment 1 (in dorsal view). 3 - 2nd segment of P5 2.3-3.1 times as long as wide. 4 - Exopodal segment 3 of P3 with terminal spine longer than the segment itself.
| | | | | Compl. Ref.: | | | Suarez-Morales & Gasca, 1998 a (p.107); in CalCOFI regional list (MDO, Nov. 2013; M. Ohman, pers. comm.) | | | | NZ: | 1 | | |
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Distribution map of Aetideus truncatus by geographical zones
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| | |  issued from : J.M. Bradford in N.Z. Jl Mar. Freshw. Res., 1971, 5 (1). [p.35, Fig.14].
North Pacific Ocean showing distribution of four Aetideus species. |
| | | | Loc: | | | NE Pacif. (tropical), CalCOFI region, Baja California | | | | N: | 2 | | | | Lg.: | | | (204) F: 1,8-1,6; M: 1,45; {F: 1,60-1,80; M: 1,45} | | | | Rem.: | epi to mesopelagic.
According to Bradford (1971, p.27) the females are distinguished from all others species, the males are very difficult to distinguish from A. armatus. | | | Last update : 27/12/2014 | |
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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., 2005-2024. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed November 21, 2024] © copyright 2005-2024 Sorbonne University, CNRS
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