Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Scolecitrichidae ( Family )
            Mixtocalanus ( Genus )
Mixtocalanus alter  (Farran, 1929)   (F,M)
Syn.: Amallophora altera (F) Farran, 1929 (p.209, 252, Descr.F, figs.F); Sewell, 1948 (p.574); non Vervoort, 1957 (p.94, figs.F); no Bradford, 1973 (p.144, figs.3a,b);
Racovitzanus antarcticus (M) : Vervoort, 1957 (p.97, figs.M); Bradford & al., 1983 (p.91, Rem.); Park, 1983 (p.172);
? Scolecithricella auropecten : Vervoort, 1951 (p.101, figs.F);
? Scolecithricella (Amallothrix) altera : Vervoort, 1965 (p.69, figs.F, Rem.);
Amallothrix altera : Roe, 1975 (p.330, figs.F, Rem.); Vives, 1982 (p.292); Lozano Soldevilla & al., 1988 (p.58);
Scolecithricella altera : Park, 1980 (p.70, figs.F, Rem.); Roe, 1984 (p.357); Shih & Young, 1995 (p.73); Schnack-Schiel & al., 2008 (p.1046: Tab.2); Park & Ferrari, 2009 (p.143, Table 4, Appendix 1, biogeography)
Ref.:
Vyshkvartzeva, 1989 (p.7, 22, 23, Rem.); Vives & Shmeleva, 2007 (p.815, figs.F,M, Rem.)
Species Mixtocalanus alter - Plate 1 of morphological figuresissued from : G.P. Farran in British Antarctic (\"Terra Nova\") Expedition, 1910. Natural History Reports. Zoology. Vol. VIII. Crustacea, 1929. [p.253, Fig.19]. As Amallophora altera.
Female: a, habitus (dorsal view); b, idem (right lateral view); c, distal part of prosome and urosome (dorsal view); d, idem (right lateral view); e, Mxp.; f, first foot; g, second foot; h, fifth feet.


Species Mixtocalanus alter - Plate 2 of morphological figuresissued from : H.S.J. Roe in Bull. British Mus. (Natural History) Zool., London, 1975, 28 (7). [p.331, Fig.18]. As Amallothrix altera.
Female: a, habitus (dorsal); b, rostrum (right lateral side); c, idem (ventral); d, last thoracic segment and urosome (right lateral side); e, A2; f, mandibular palp; g, Mx1; h, Mx2; i, Mxp; j, P1; k, P2; l, P3; m, P4; n, P5.
Bar scale 0.1 mm unless indicated.


Species Mixtocalanus alter - Plate 3 of morphological figuresissued from : T. Park in Antarct. Res. Ser. Washington, 1980, 31 (2). [p.68, Fig.22]. As Scolecithricella altera.
Female: a, habitus (dorsal); b, idem (lateral right side); c, last thoracic segments and urosome (lateral left side); d, forehead (lateral); e, rostrum (anterior); f, A2; g, Md; h, Mx1; i, distal part of Mx2; j, Mxp; k, P1 (anterior); l, P2 (posterior); m, P3 (posterior); n, P4 (posterior); o, P5 (posterior).
Nota: Cephalosome and 1st metasomal segment fused, 4th and 5th partially separated by an articulation suture.Urosome about 1/4 length of prosome. A1 reaching close to distal end of prosome.


Species Mixtocalanus alter - Plate 4 of morphological figuresIssued from : W. Vervoort in Atlantide Report, 1965, 8. [p.70, Fig.14]. As Scolecithricella (Amallothrix) altera..
Female (from off Angola-Sierra Leone): a, habitus (lateral right side); b, idem (dorsal)


Species Mixtocalanus alter - Plate 5 of morphological figuresIssued from : W. Vervoort in Atlantide Report, 1965, 8. [p.71, Fig.15]. As Scolecithricella (Amallothrix) altera.
Female: a, c, posterior part cephalothorax and urosome (dorsal and lateral right side, respectively); b, forehead (ventral); d, P1; e, P5.


Species Mixtocalanus alter - Plate 6 of morphological figuresIssued from : W. Vervoort in Atlantide Report, 1965, 8. [p.73, Fig.16]. As Scolecithricella (Amallothrix) altera.
Female: a, Mx2; b, P2 (posterior); c, P3 (posterior); d, P4 (posterior).
Nota: Mx2 with endopodite 2-segmented, carries 7 sensory appendages of two types (fairly short, thick brush-shaped appendages and slender, filiform appendages with a narrowed, curved apical portion); 1st endopodal segment with 1 brush-shaped and 2 filiform sensory appendages, 2nd endopodal segment (apical) with 1 brush-shaped and 3 filiform sensory appendages.


Species Mixtocalanus alter - Plate 7 of morphological figuresissued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Reports - Ser. B, Vol. III, 1957 [Fig.81]. As Racovitzanus antarcticus.
Male (from 61°44'S, 77°59'E): a, habitus (lateral); b, posterior part cephalothorax and urosome (lateral); c, forehead (lateral).


Species Mixtocalanus alter - Plate 8 of morphological figuresissued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Reports - Ser. B, Vol. III, 1957 [Fig.82]. As Racovitzanus antarcticus.
Male: a, frontal part of head (lateral); ; b, posterior part cephalothorax and urosome (dorsal); c, left P4 (posterior); d, P5 (rt = left leg; rt = right leg); e, forehead (dorsal); f, right Mx2.


Species Mixtocalanus alter - Plate 9 of morphological figuresissued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Reports - Ser. B, Vol. III, 1957 [Fig.83]. As Racovitzanus antarcticus.
Male: a, right A2; b, right A1; c, left Md (manducatory plate); d, left Md (mandibular palp); e, left Mx1.


Species Mixtocalanus alter - Plate 10 of morphological figuresissued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Reports - Ser. B, Vol. III, 1957 [Fig.84]. As Racovitzanus antarcticus.
Male: a, left P1 (posterior); b, right P2 (posterior); c, right P3 (posterior); d, right Mxp.

Compl. Ref.:
Razouls & al., 2000 (p.343, Appendix); Kuriyama & Nishida, 2006 (p.299: Tab.II, fig. 10, vertical distribution)
NZ: 5 + 1 doubtful

Distribution map of Mixtocalanus alter by geographical zones
Species Mixtocalanus alter - Distribution map 3
Chart of 1996
Loc:
Antarct. (Ross Sea, W Peninsula, ? Croker Strait, W Weddell Sea, Indian), sub-Antarct. (Indian), ? G. of Guinea, Cape Verde Is., off Morocco-Mauritania, Canary Is., off W Cape Finisterre, China Seas (South China Sea in Shih & Young, 1995; W. Zhang & al., 2010), Japan (Sagami Bay)
N: 9
Lg.:
(8) F: 2,2-1,98; ? (16) F: 3,00; (25) M: 2,3; (35) F: 2,76-2,67; (523) F: 2,8-2,56; (1000) F: 2,0; {F: 1,98-2,76; M: 2,30}
Rem.: Mesopelagic.
Sampling depth (Antarct., sub-Antarct.) : 100-1000 m.
For Vervoort (1965, p.72) Farran's drawing of Mxp (Farran, 1929, fig.19e) is not correct. the female found from the Gulf of Guinea (not indicated in his list from the station 139) has mutilated legs, but a comparison of the various appendages with those of the Antarctic specimens (Vervoort, 1957) leaves no doubt about its identity. This species is very closely related, if not identical with Xanthocalanus incertus Sars, 1920 (cf. Sars, 1925, p.139, Pl.38, figs.19-23; Rose, 1933, p.132, fig.122).
The report of this species in the Chinese Sea needs confirmation. W. Zhang confirms the presence of this species in the Chinese Seas (pers. comm., 2006)
Last update : 18/07/2019
    to add your remark
  

 Any use of this site for a publication will be mentioned with the following reference :

Razouls C., de Bovée F., Kouwenberg J. et Desreumaux N., 2005-2019. - Diversity and Geographic Distribution of Marine Planktonic Copepods. Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed July 20, 2019]

© copyright 2005-2019 Sorbonne University, CNRS

Webmaster
CNRS   Observatoire Océanologique de Banyuls sur Mer - Laboratoire Arago
Sorbonne Université

 

Version française
English version

 

Search

On the WEB of CNRS

 


Marine Planktonic Copepods

Marine Planktonic Copepods

 

Imprimer Contact Accueil Plan du site Accès restreint Retour Une du Labo Imprimer Contact Plan du site Crédits Téléchargez les Plug-Ins