Species Card of Copepod
Calanoida ( Order )
    Arietelloidea ( Superfamily )
        Arietellidae ( Family )
            Arietellus ( Genus )
Arietellus giesbrechti  Sars, 1905   (F,M)
Syn.: no Arietellus giesbrechti : Tanaka, 1964 c (p.231, figs.F)
Sars, 1905 c (p.21, Descr.F); 1925 (p.331, figs.F,M); Farran, 1908 b (p.82, Rem.); Lysholm & al., 1945 (p.40); Sewell, 1947 (p.233, figs.F,M, Rem.); C.B. Wilson, 1950 (p.167, fig.F); Grice, 1962 (p.226, fig.M); Vervoort, 1965 (p.151, Rem.); Owre & Foyo, 1967 (p.90, figs.F,M); Guangshan & Honglin, 1997 (p.399, Rem.); Chihara & Murano, 1997 (p.720, Pl.: 55: F,M); Bradford-Grieve & al., 1999 (p.881, 937, figs.F,M); Vives & Shmeleva, 2007 (p.148, figs.F,M)
Species Arietellus giesbrechti - Plate 1 of morphological figuresIssued from : G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl.CXIX, figs.1-6].
Female: 1, habitus (dorsal); 2, forehead (lateral); 3, P5.

Male: 4, habitus (dorsal); 5, left A1; 6, P5.

Species Arietellus giesbrechti - Plate 2 of morphological figuresissued from : R.B.S. Sewell in The John Murray Expedition, 1933-34, Scientific Reports, VIII (1), 1947. [p.235, Fig.63].
Female (fromS Arabian Sea): A, posterior thoracic segments (lateral right side); B, A1; C, A2; D, Md; E, Mx1; G, Mx2; H, Mxp; I, Mxp (one of the spines, enlarged); J, P1; K, P3; L, P5.
Nota: The proportional lengths of the various segments of the body (cephalon to caudal rami) as 382:140:94:89:65:72:37:33:37:51 = 1000. The body is plentifully supplied with cutaneous glands, which are particularly numerous in the postero-lateral region of the fused 4 th-5th thoracic segments. A1 19-segmented (segments 1 and 2 fused, 8, 9 and 10 partly fused, 12-13 almost completely fused, 21-25 fused, and the surface of the combined segment is covered with very fine punctuations). In Mx1 the endopod is represented by a small, rounded swelling.

Male (from Central area of Arabian Sea): F, Mx2; M, P5.
Nota: The proportional lengths of the various segments of the body (cephalon to caudal rami) as 381:143:88:85:64:51:31:31:28:37:61 = 1000. Head and 1st pediger segment separate, 4th and 5th fused. Left A1 19-segmented (segments 1-2, 19-20, 21-25 fused, the distal half of segments 19-20 and the whole of 21-25 finely punctate) modified to form a grasping organ. The strong setae from the distal portion of both the Mx2 and the Mxp bear a row of flattened platelets each terminating in a short spine (as figured by Esterly, 1905, fig.42c, in A. setosus). P5 appear to resemble those of A. plumifer Sars more nearly than the figure given by Sars for A. giesbrechti.

Species Arietellus giesbrechti - Plate 3 of morphological figuresissued from : G.D. Grice in Fish. Bull. Fish and Wildl. Ser., 1962, 61. [p.227, Pl.27, Fig.5].
Male (from 00°00', 149°38'W): 5, P5.
Nota: The left posterior thoracic margin is slightly longer than the right.

Species Arietellus giesbrechti - Plate 4 of morphological figuresissued from : L. Guangshan & Q. Honglin in Acta Oceanologica Sinica, 16 (3). [p.399, Table 1].
Female : morphological characters in Arietellus giesbrechti.

Nota: Compare with A mohri and A. unisetosus.

Compl. Ref.:
Sewell, 1948 (p.329, 505, 522, 528, 531); De Decker & Mombeck, 1964 (p.11); De Decker, 1968 (p.45); Grice & Hulsemann, 1968 (tab.2); Roe, 1972 (p.277, tabl.1, tabl.2); Deevey & Brooks, 1977 (p.156, tab.2, Station "S"); Stephen & Rao, 1980 (p.242); Vives, 1982 (p.294); Madhupratap & Haridas, 1986 (p.105, tab.1); Lozano Soldevilla & al., 1988 (p.60); Suarez-Morales & Gasca, 1998 a (p108); Lapernat, 2000 (tabl.3, 4); Fernandes, 2008 (p.465, Tabl.2); Galbraith, 2009 (pers. comm.)
NZ: 9

Distribution map of Arietellus giesbrechti by geographical zones
Species Arietellus giesbrechti - Distribution map 2issued from : R. Stephen & T.S.S. Rao in J. Plankton Res., 1980, 2 (2). [p.242, Fig.1].
Distribution of Arietellus and Paraugaptilus in the Indian Ocean (open circles indicate the stations selected for the study).
South Africa (E & W), Namibia, Dakar, off NW Cape Verde Is., Canary Is., off N Azores, Portugal, Baie Ibero-morocco Bay, G. of Guinea, Brazil S, off Amazon, Caribbean, G. of Mexico, Sargasso Sea, off Bermuda: Station ‘’ S’’ (32°10’N, 64°30’W), Arabian Sea, Indian, Bay of Bengal, Philippines, Japan (Izu), Vancouver Is., Pacif. (equatorial), E Pacif., off Peru, NE Easter Is., off Juan Fernandez Is.
N: 23
(1) F: 4,7; (11) F: 5,53-5,16; M: 4,67; (16) F: 5,7-4,73; M: 5,35-5,28; (101) M: 4,75; (199) F: 4,86; {F: 4,70-5,70; M: 4,67-5,35}
Rem.: mesopelagic. Overall Depth Range in Sargasso Sea: 500-1000 m (Deevey & Brooks, 1977, Station "S");
For Heinrich (1996, p.1779), the species cited by Sewell (1947) would be synonym to Arietellus plumifer.
R. Stephen: Data sheets of NIO, Kochi, India (on line).

Morphological characteristics of females:
- Corners of the last thoracic segment pointed, not divergent, symmetrical, left one longer.
Forehead rounded, without point.
- Caudal setae short.
Last update : 07/01/2017
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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 September 24, 2021]

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