Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Aetideidae ( Family )
            Gaetanus ( Genus )
Gaetanus brachyurus  Sars, 1907   (F,M)
Ref.:
Sars, 1907 a (p.10, Rem.F); Sars, 1925 (p.62, figs.F); Jespersen, 1934 (p.63); 1940 (p.22); Vervoort, 1952 e (n°46, p.3, fig.F); Grice & Hulsemann, 1967 (p.15, 23: Rem.); 1968 (p.324, 327: Rem.); Park, 1975 a (p.14, figs.F,M); Markhaseva, 1996 (p.183, figs.F,M)
Species Gaetanus brachyurus - Plate 1 of morphological figuresissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.184, Fig.142].
Female (specimen from Kuril). Ce: forehead (lateral); Pmd: mandibular palp; GntbMd: gnathobase of Md (partial).


Species Gaetanus brachyurus - Plate 2 of morphological figuresissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.185, Fig.143].
Female (specimen from Kuril Trench).


Species Gaetanus brachyurus - Plate 3 of morphological figuresissued from : T. Park in Bull. Mar. Sci., 1975, 25 (1). [p.16, Fig.2].
Male: A, habitus (lateral); B, C, forehead (lateral, dorsal); D, posterior part of metasome (lateral); E, posterior part of metasome and genital segment (dorsal); F, A2; G, distal part of Mx1; H, P1 (anterior); I, P5 (posterior); J, last two exopodal segments of left P5 (medial). P1, P5: legs.


Species Gaetanus brachyurus - Plate 4 of morphological figuresissued from : T. Park in Bull. Mar. Sci., 1975, 25 (1). [p.15, Fig.1].
Female: A, B, habitus (dorsal, lateral, respectively); C, D, posterior part of metasome and urosome (dorsal, lateral); E, forehead (lateral); F, A2; G, coxa of Mxp; H, P1 (anterior); I, coxa of P4 (partial, posterior).


Species Gaetanus brachyurus - Plate 5 of morphological figuresIssued from: G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl.XVIII, figs.9-10].
Female: 9, habitus (dorsal); 10, idem (lateral left side).


Species Gaetanus brachyurus - Plate 6 of morphological figuresGaetanus brachyurus female:
1 - Anterior part of cephalon with frontal spine.
2 - Exopodal segments 1 and 2 of A2 with 2 setae each. 2nd internal lobe of Mx1 with 5 setae.
3 - Exopodal segment 1 of P1 clearly 3-segmented; exopod with 3 external spines. Lateral plate of Mxp protopodite well developed.
4 - Spines of last thoracic segment straight, situated in about the middle of the posterior border of last thoracic segment (lateral view).
5 - Frontal spine strongly curved in direction to rostrum (lateral view). Exopodal segments 1 and 2 of A2 with 2 setae each.


Species Gaetanus brachyurus - Plate 7 of morphological figuresGaetanus brachyurus male:
1 - Cephalon with frontal spine.
2 - Exopodal segment 3 of P5 bilobated. It is 1.5-2.2 shorter than exopodal segment 2.
3 - Spines on last thoracic segment long, exceeding the posterior border of genital segment. Exopodal segment 3 of P5 bilobated with incomplete subdivision into lobes.
4 - Endopod of left P5 as long as 1/3 of exopodal segment 1 length. Exopodal segment 3 of left P5 less than half of exopodal segment 2 length.

Compl. Ref.:
Sewell, 1948 (p.499); Grice & Hulsemann, 1968 (tab.2); Deevey & Brooks, 1977 (p.256, tab.2, Station "S"); Suarez-Morales & Gasca, 1998 a (p108)
NZ: 6

Distribution map of Gaetanus brachyurus by geographical zones
Species Gaetanus brachyurus - Distribution map 2
Chart of 1996
Loc:
Atlant (N temperate), G. of Mexico, Sargasso Sea, off Bermuda: Station "S" (32°10'N, 64°30'W), S Azores , Faroe Is., S Iceland, S Strait of Davis, W Indian, Kurile-Kamchatka, SE Pacif. (off Juan Fernandez Is.).

Type locality: North Atlantic (off N Canary Islands).
N: 8
Lg.:
(1) F: 6,4; (37) F: 7,15; (40) F: 5,75-5,58; M: 5,16; (67) F: 5; 6,42; 6,17; {F: 5,00-7,15; M: 5,16}
Rem.: epi-bathypelagic-?. 1000-1500 m in Sargasso Sea (Deevey & Brooks, 1977, station "S");
After Grice & Hulsemann (1967, p.23) a female differs from the others in having the exopod of P1 consisting of two segments; each segment has 1 external spine; the specimen is also smaller (5.00 mm).
Last update : 05/01/2015
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2021. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed October 18, 2021]

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