Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Aetideidae ( Family )
            Aetideus ( Genus )
Aetideus australis  (Vervoort, 1957)   (F,M)
Syn.: Euaetideus australis Vervoort, 1957 (p.46, Descr.F, figs.F, Rem.); Ahlstrom & Thrailkill, 1963 (p.57, Table 5, abundance); Park, 1978 (p.105, figs.F,M); Ward, 1989 (tab.2); Atkinson & al., 1990 (p.1213, tab.1); Atkinson & Sinclair, 2000 (p.46, 50, 51, 53, 55, zonal distribution); Ward & al., 2014 (p.305, Table 6, abundance in the ''Discovery'' Investigations in the 1930s)
Ref.:
Bradford, 1971 (p.19, figs.F); Bradford & Jillett, 1980 (p.14, figs.F,M, fig. 73, distribution chart); Razouls, 1994 (p.64, figs.F,M); Mazzocchi & al., 1995 (p.133, figs.F,M, Rem.); Bradford-Grieve & al., 1999 (p.879, 920, figs.F,M); Park & Ferrari, 2009 (p.143, Table 3, Appendix 1, biogeography from Southern Ocean)
Species Aetideus australis - Plate 1 of morphological figuresissued from : M.G. Mazzocchi,G. Zagami, A. Ianora, L.Guglielmo, N. Crescenti & J. Hure in Atlas of Marine Zooplankton Straits of Magellan. Copepods; L. Guglielmo & A. Ianora (Eds)., 1995. [p.134, Fig.3.22.1].
Female: A, habitus (dorsal); B, urosome (dorsal); C, idem (lateral right side).
Nota: Proportional lengths of urosomites and furca 32:14:10:16:28 = 100. Very conspicuous seminal receptacles (both in dorsal and lateral views), with distal end expanded into large bursa. basipod 1 of P4 with row of strong, wide spinules at base of internal seta.

Male: D, habitus (dorsal); E, urosome (dorsal); F, P5.
Nota: Proportional lengths of urosomites and furca 18:22:18:22:2:18 = 100. Anal somite extremely reduced, hidden between 4th urosomal somite and furca.


Species Aetideus australis - Plate 2 of morphological figuresissued from : T. Park in Antarctic Res. Ser. Washington, 1978, 27. [p.106, Fig.2]. As Euaetideus australis
Female: A, habitus (dorsal view); B, idem (right lateral view); C, posterior part of metasome and urosome (dorsal view); D, idem (right lateral view); E, rostrum (anterior view); F, Mx1; G, P1 (anterior view); H, P4 (posterior view); I, medial part of coxa of P4 (posterior view).


Species Aetideus australis - Plate 3 of morphological figuresissued from : T. Park in Antarctic Res. Ser. Washington, 1978, 27. [p.107, Fig.3]. As Euaetideus australis
Male: A, habitus (dorsal view); B, idem (left lateral view); C, posterior part of metasome with fifth leg and urosome (ventral view); D, A2; E, mandibular palp; F, P5 (posterior view).


Species Aetideus australis - Plate 4 of morphological figuresissued from : J.M. Bradford in N.Z. Jl Mar. Freshw. Res., 1971, 5 (1). [p.20, Fig.5].
Female (from SW Pacific): a, habitus (lateral left side); b, urosome and posterior thoracic points (dorsal); c, rostrum; d, A2; e, Mx1; f, 1st basipod of P4; g, P1; h, genital segment and posterior thoracic points (latero-ventral right side).

Nota: Posterior last thoracic segment with points; points do not reach posterior border of urosomal segment 2, just over half way.
Endopodite of P1 with row of small spinules on internal border.
Coxopodite of P4 with row of 4 small spines at dase of internal seta.
A1 reaches the tip of caudal rami.
Rostrum: width : depth ratio about 1.06-1.48.
Endopod of P1 with row of small spinules on internal border. Basipod 1 of P4 with row of 4 small spines at base of internal seta.
Seminal receptacle with a short neck, at most 3 times as long as wide, joining the dorsal and ventral sacs.


Species Aetideus australis - Plate 5 of morphological figuresissued from : J.M. Bradford in N.Z. Jl Mar. Freshw. Res., 1971, 5 (1). [p.22, Fig.7].
Male (from SW Pacific): a, habitus (dorsal); b, forehead (ventral); c, A1; d, A2; e, Md (mandibular palp); f, Mx1; g, Mxp; h, P1; i, P2; j, P3; k, P4; l, P5; m, terminal segment of P5.

Nota: Posterior thoracic segment with points, just to pass the posterior border of urosomal segment 1.
Caudal rami 2.8-3.12 times as long as wide.
Rostrum absent.
A1 21-segmented.
1st and 2nd lobes of Mx1 reduced, 3rd inner, basipod, endopod, exopod and 1st outer lobe with 2, 3, 8, 10, 5 setae respectively.
P1-P4 like those of female except that the terminal spine on the exopod has a greater number of teeth (22 on P2).
P5 width : length ratios of segments 2, 3 and 4 are 1 : 2.9-3.5; 1 : 7.1-8.0 and 1 : 5.7-7.5 respectively.


Species Aetideus australis - Plate 6 of morphological figuresIssued from: M.G. Mazzocchi, G. Zagami, A. Ianora, L. Guglielmo & J. Hure in Atlas of Marine Zooplankton Straits of Magellan. Copepods. L. Guglielmo & A. Ianora (Eds.), 1995. [p.135, Fig.3.22.2].
Female (SEM preparation): A, habitus (dorsal); B, idem (lateral left side); C, rostrum; D, urosome (dorsal); E, genital somite (ventral); F, row of strong spinules at base of internal setae of basipod 1 of P4.
Bars: A, B, D 0.100 mm; C 0.050 mm; F 0.010 mm.


Species Aetideus australis - Plate 7 of morphological figuresIssued from: M.G. Mazzocchi, G. Zagami, A. Ianora, L. Guglielmo & J. Hure in Atlas of Marine Zooplankton Straits of Magellan. Copepods. L. Guglielmo & A. Ianora (Eds.), 1995. [p.98, Fig.3.13.3].
Male (SEM preparation): A, habitus (dorsal); B, postero-lateral right corner of last thoracic somite; C, P5; D, last segment of P5 left exopod; E, integumental organ on midpoint of postero-dorsal margin of cephalon (black arrow in A); F, cephalic integumental organ situated in mid-head region (white arrow in A).
Bars: A 0.500 mm; B 0.050 mm; C 0.100 mm; D-F 0.010 mm.


Species Aetideus australis - Plate 8 of morphological figuresissued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Report Ser. B, Vol. III., 1957 [Fig.17]. As Euaetideus australis.
Female (from 47°43'S, 76°48'E): a-b, habitus (lateral and dorsal, respectively); c, posterior part cephalothorax and urosome (dorsal); d, forehead (lateral).


Species Aetideus australis - Plate 9 of morphological figuresissued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Report Ser. B, Vol. III., 1957 [Fig.18]. As Euaetideus australisi.
Female: a, posterior part cephalothorax and urosome (lateral); b, right A2; c, right A1; d, genital somite (ventral); e, Md (cutting edge); f, right Mx1; g, left Mxp.


Species Aetideus australis - Plate 10 of morphological figuresissued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Report Ser. B, Vol. III., 1957 [Fig.19]. As Euaetideus australis.
Female:a, right P1 (anterior); b-d, P2 to P4 (left legs); e, Md (mandibular palp); f, left Mx2.


Species Aetideus australis - Plate 11 of morphological figuresissued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Report Ser. B, Vol. III., 1957 [Fig.20 a]. As Euaetideus australis.
Female: a, distal portion of rostral plate.


Species Aetideus australis - Plate 12 of morphological figuresissued from : J.M. Bradford in N.Z. Jl Mar. Freshw. Res., 1971, 5 (1). [p.21, Fig.6, a].
Scanning electron microscope photograph of anterior integument with very small chitinous thickenings in A. autralis. (x 3000).


Species Aetideus australis - Plate 13 of morphological figuresissued 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 australis.
Compare with A. armatus, A. truncatus, A. divergens and A. pseudarmatus.

Compl. Ref.:
Ahlstrom & Thrailkill, 1963 (p.57, Table 5, abundance); Errhif & al., 1997 (p.422); Razouls & al., 2000 (p.343, tab.3, Appendix); Michels & al., 2012 (p.369, Table 1, occurrence frequency);
NZ: 6

Distribution map of Aetideus australis by geographical zones
Species Aetideus australis - Distribution map 3issued from : J.M. Bradford in N.Z. Jl Mar. Freshw. Res., 1971, 5 (1). [p.34, Fig.13].

Southwest Pacific Ocean showing distribution of four Aetideus species.
Species Aetideus australis - Distribution map 4issued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Reports - Ser. B, Vol. III, 1957 [Fig.16]. As Euaetideus australis
Chart showing the geographical distribution (white circle) in the seas surrounding the Antarctic continent.
Nota: In this chart the area frequented by whaling vessels has been hatched. The Antarctic circle (66°.5 S) has been drawn as a broken line. The numbers I to VI refer to the sectors into which the Antarctic seas are divided according to Mackintosh (1942) (after Vervoort, 1951).
Species Aetideus australis - Distribution map 5Issued from : A. Atkinson & J.D. Sinclair in Polar Biol., 2000, 23. [p.50, Fig.3]
Euaerideus australis (= Aetideus australis) from Scotia Sea.
Median and interquartile ranges of copepods (nos /m2) in the five water zones; from north to south these are SAF Subantractic Front area, PFZ Polar frontal Zone, PF Polar Front area, AZ Antarctic Zone, WSC Weddell-Scotia Confluence area/ East Wind Drift.
Numbers on the plots are upper interquartiles where these could not be scaled.
Loc:
Antarct. (SW Atlant., Weddel Sea, South Georgia, Indian, SW & SE Pacif.), sub-Antarct. (Indian, SW & SE Pacif.), S Indian (subtropical convergence), SW Africa, Straits of Magellan (Pacific and Central area), New Zealand, off Baja California (in Ahlstrom & Thrailkill (1963);
N: 12 + 1?
Lg.:
(20) F: 2,04-1,78; M: 1,74-1,6; (25) F: 2-1,95; (36) F: 1,96-1,76; M: 1,57-1,55; {F: 1,76-2,04; M: 1,55-1,74}

The mean female size is 1.915 mm (n = 6; SD = 0.1169), and the mean male size is 1.615 mm (n = 4; SD = 0.0858). The size ratio (male : female) is approximately 0.86.
Rem.: Sampling depth (Antarct., sub-Antarct.) : 0-3000 m.
For Bradford & Jillett (1980, p.14) this species is mainly from subantarctic waters although it has been recorded from north of the Subtropical Convergence off southern Africa (Bradford, 1971), and from south of the Antarctic Convergence (Vrervoort, 1957), but also not rare off Baja California coast by Ahlstrom & Thrailkill (1963, Table 5).
Last update : 20/01/2016
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