Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Aetideidae ( Family )
            Gaetanus ( Genus )
Gaetanus brevirostris  (Brodsky, 1950)   (F,M)
Syn.: Gaidius brevirostris Brodsky, 1950 (1967) (p.160, figs.F,M); Park, 1978 (p.127); Bradford & Jillett, 1980 (p.58)
Park, 1975 a (p.13); Markhaseva & Razzhivin, 1992 (1993) (p.611); Markhaseva, 1996 (p.187, figs.F,M)
Species Gaetanus brevirostris - Plate 1 of morphological figuresissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.190, Fig.148].
Female (specimen from NW Pacif.: kuril Trench). Ce: forehead (lateral); R: rostrum (anterior); P.md: mandibular palp.
Nota: A1 as long as cephalothorax, or longer by 1-2 segments.

Male (from Brodsky, 1950).

Species Gaetanus brevirostris - Plate 2 of morphological figuresIssued from : K.A. Brodskii in Calanoida of the Far Eastern Seas and Polar Basin of the USSR. Opred. Fauna SSSR, 1950, 35 (Israel Program for Scientific Translations, Jerusalem, 1967) [p.161, Fig.73]. As Gaidius brevirostris.
Female (from NW Pacif.): R, rostrum; corner of the last thoracic segment and urosome (lateral right side); Mp2, Mxp; S4B1, distal inner margin of basipodal segment 1 of P4.
Nota: Spines on posterior corners of last thoracic segment short, situated in the middle of posterior border (lateral view).

Male: S5, P5.

Species Gaetanus brevirostris - Plate 3 of morphological figures
Gaetanus brevirostris female:
1 - Cephalon without frontal spine.
2 - Posterior corners of last thoracic segment with small spines.
3 - Exopodal segment 1 of A2 without setae; segment 2 with 2 setae. 2nd internal lobe of Mx1 with 4 setae. Exopod of P1 3-segmented with 2 external spines.
4 - Mxp protopodite without lateral plate.
5 - Md palp base with 2 setae.
6 - Exopod of P1 clearly 3-segmented.

Species Gaetanus brevirostris - Plate 4 of morphological figuresGaetanus brevirostris male:
1 - Cephalon without frontal spine.
2 - Cephalon without crest in anterior part.
3 - Exopodal segment 3 of left P5 stylet-like. Body size < 5 mm.
4 - Posterior corners of last thoracic segment with spines.
5 - Spines significantly shorter than the border of genital segment.
6 - Exopodal segment 3 of P5 with stylet-like narrow.
7 - Body size ± 4 mm.

Compl. Ref.:
Galbraith, 2009 (pers. comm.)
NZ: 2

Distribution map of Gaetanus brevirostris by geographical zones
Kuril-Kamchatka, Aleutian Trench, Vancouver Is.

Type locality: Pacific (NW part).
N: 5
(22) F: 4,1-4; M: 4; (37) F: 4,2-4; M: 4; {F: 4,00-4,20; M: 4,00}
Rem.: bathy & abyssopelagic.
Last update : 05/01/2015
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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 May 25, 2024]

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