Species Card of Copepod
Harpacticoida ( Order )
    Cervinioidea ( Superfamily )
        Aegisthidae ( Family )
            Aegisthus ( Genus )
Aegisthus aculeatus  Giesbrecht, 1891   (F,M)
Syn.: ? Aegisthus spinulosus (? juv.) Farran, 1905 (p.46, Descr.F, figs.F)
Ref.:
Giesbrecht, 1892 (p.573, 577, 770, Descr.F, figs.F); A. Scott, 1909 (p.233, Rem.); Farran, 1926 (p.301); Rose, 1933 a (p.293, figs.F); Sewell, 1947 (p.292); Lysholm & al., 1945 (p.45); Sewell, 1947 (p.292); Lang, 1948 a (p.177, figs.F, Rem.F,M); Marques, 1958 a (p.140, figs.M, Rem.); Owre & Foyo, 1967 (p.103, Rem. M, figs.F,M); Wells, 1970 (n°133, p.4, figs.); Boxshall, 1979 (p.204, figs.F,M, Rem. M), Vives, 1982 (p.295); Bradford-Grieve & al., 1999 (p.887, 968, figs.F,M); Conroy-Dalton & Huys, 1999 (p.429, Rem.); Boxshall & Halsey, 2004 (p.229: fig.F); Vives & Shmeleva, 2010 (p.88, figs.F,M, Rem.)
Species Aegisthus aculeatus - Plate 1 of morphological figuresissued from : G.A. Boxshall in Bull. Br. Mus. nat. Hist. (Zool.), 1979, 35 (3). [p.205, Fig.1, H-O].
Female (from 18°N, 25°W): H, habitus (dorsal); I, A2; J, Mxp; K, P1; L, P5; M, P6.

Male: N, habitus (dorsal); O, P5.

Scales 0.1 mm unless otherwise indicated.


Species Aegisthus aculeatus - Plate 2 of morphological figuresissued from : H.B. Owre & M. Foyo in Copepods of the Florida Current. Fauna Caribaea, 1967, 1, Crustacea, Part 1: Copepoda. [p.104, Figs.750-751].
Male: 750, P5; 751, P6.

Nota: The male resembles the female in general characteristics (shape of body, rostrum, length of caudal setae). P5 is 2-segmented; the 1st segment is incompletely separated from basipod 2 and there is a long seta on the outer margin which probably actually is a structure of the basipod; a stout serrated spine emerges from the outer distal corner of the 1st segment, the 2nd segment bears 4 serrated spines (2 on the outer margin and 2 terminal, of inequal length) and 2 internal setae.


Species Aegisthus aculeatus - Plate 3 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. – Fauna Flora Golf. Neapel, 1892, 19 , Atlas von 54 Tafeln. [Taf.46, Fig.44].
Female: 44, habitus (lateral).


Species Aegisthus aculeatus - Plate 4 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. – Fauna Flora Golf. Neapel, 1892, 19 , Atlas von 54 Tafeln. [Taf.46, Figs.45, 50];
Female: 45, habitus (dorsal); 50, thoracic segment 5 with P5, and abdominal segments 1 and 2 (ventral).


Species Aegisthus aculeatus - Plate 5 of morphological figuresissued from : H.B. Owre & M. Foyo in Copepods of the Florida Current. Fauna Caribaea, 1967, 1, Crustacea, Part 1: Copepoda. [p.103, Fig.748].
Male: 748, forehead (dorsal)


Species Aegisthus aculeatus - Plate 6 of morphological figuresissued from : H.B. Owre & M. Foyo in Copepods of the Florida Current. Fauna Caribaea, 1967, 1, Crustacea, Part 1: Copepoda. [p.103, Fig.749].
Male: 749, A1.


Species Aegisthus aculeatus - Plate 7 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. – Fauna Flora Golf. Neapel, 1892, 19 , Atlas von 54 Tafeln. [Taf.49, Figs.1, 8].
Female: 1, A2; 8, A1 (dorsal view).


Species Aegisthus aculeatus - Plate 8 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. – Fauna Flora Golf. Neapel, 1892, 19 , Atlas von 54 Tafeln. [Taf.49, Figs.4, 5, 7].
Female: 4, Mxp; 5, distal part of caudal ramus (vrntral view); 7, Mx2.


Species Aegisthus aculeatus - Plate 9 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. – Fauna Flora Golf. Neapel, 1892, 19 , Atlas von 54 Tafeln. [Taf.49, Fig.11];
Female: 11, P1 (anterior view).


Species Aegisthus aculeatus - Plate 10 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. – Fauna Flora Golf. Neapel, 1892, 19 , Atlas von 54 Tafeln. [Taf.49, Fig.9];
Female: 9, Mx1 (posterior view).

Compl. Ref.:
Cleve, 1904 a (p.185); Sewell, 1948 (p.394); Grice, 1963 a (p.496); Furuhashi, 1966 a (p.295, vertical distribution in Oyashio/Kuroshio transitional area, Table 8, 9); .Björnberg, 1973 (p.371, 384); Deevey & Brooks, 1977 (p.256, tab.2, Station "S"); Vives, 1982 (p.295); Greze & al., 1985 (p.8); Shih & Young, 1995 (p.75); Böttger-Schnack, 1996 (p.1088); Baker & al., 2005 (tabl.); Morales-Ramirez & Suarez-Morales, 2008 (p.515); Hidalgo & al., 2010 (p.2089, Table 2); Medellin-Mora & Navas S., 2010 (p.265, Tab. 2); Zaafa & al., 2014 (p.67, Table I, occurrence); El Arraj & al., 2017 (p.272, table 2, spatial distribution);
NZ: 13

Distribution map of Aegisthus aculeatus by geographical zones
Loc:
South Africa (E), Angola, off Cape Verde Is. , off Mauritania, Canary Is., Moroccan coast, Brazil, Caribbean, Caribbean Sea, Caribbean Colombia, E Costa Rica, Sargasso Sea, off Bermuda (Station "S"), W Ireland, G. of Biscay, off W Tangier, Medit. (Alboran Sea), Arabian Sea, Arabian Gulf, Laccadive Is., Madagascar, Indonesia-Malaysia, China Seas (South China Sea), Japan, off SW Galapagos, Chile (N-S)
N: 30
Lg.:
(38) M: 1,28; (46) F: 1,85; (138) F: 1,85-1,64; M: 1,35-1,28; (618) M: 1,36-1,06; {F: 1,64-1,85; M: 1,06-1,36}
Rem.: meso-bathypelagic. Sargasso Sea: 500-2000 m (Deevey & Brooks, 1977, Station "S"). 660-900 m at Station S 2 in S Bösö (E middle Japan); 603-1236 at Station T-1 (E Tori Is., E middle Japan) from Furuhashi (1966 a).
According to Lang (1948 a) A. spinulosus would be a juvenile form of A. aculeatus.

Identification characters:
Female: Rostrum ending in short pointed. Anterior prosome with chitinuous net.
Male: Front rounded with rostrum. A1 7-segmented, the three distal segments short. Prosome without chitinuous net.
Last update : 25/10/2022
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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]

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