Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Clausocalanoidea ( Superfamille )
        Scolecitrichidae ( Famille )
            Pseudoamallothrix ( Genre )
Pseudoamallothrix obtusifrons  (Sars, 1905)   (F)
Syn.: Amallophora obtusifrons Sars, 1905 b (p.22, Rem.F); Pearson, 1906 (p.17, Rem.); Bradford, 1973 (p.143); Bradford & al., 1983 (p.78, Rem.); Lapernat, 2000 (tabl.3, 4);
Amallothrix obtusifrons : Sars, 1925 (p.179, figs.F, [no M]); Sewell, 1929 (p.221, Rem.); Rose, 1933 a (p.153, figs.F, [no M]); Wilson, 1942 a (p.171); Lysholm & al., 1945 (p.28); Sewell, 1948 (p.349, 502, 546, 550, 567); C.B. Wilson, 1942 a (p.171, fig.F); 1950 (p.162, figs.F); Grice, 1963 a (p.495); Grice & Hulsemann, 1967 (p.16); Björnberg, 1973 (p.384); Deevey & Brooks, 1977 (p.256, tab.2, Station "S"); Lozano Soldevilla & al., 1988 (p.58); Bradford-Grieve & al., 1999 (p.881, 931, figs.F); Razouls & al., 2000 (p.343, Appendix); Vives & Shmeleva, 2007 (p.736, figs.F,M, Rem.);
? Scolecithricella curticauda A. Scott, 1909 (p.94, figs.F);
Scolecithrix obtusifrons : van Breemen, 1908 a (p.75); no Farran, 1908 b (p.54, Rem.);
? Scolecithricella tydemani A. Scott, 1909 (p.93, figs.F); Wilson, 1932 (p.79);
no Scaphocalanus obtusifrons : With, 1915 (p.194); Lysholm & Nordgaard, 1921 (p.21);
Scolecithricella obtusifrons : Park, 1980 (p.66, figs.F, Rem.); Park & Ferrari, 2009 (p.143, Table 4, Appendix 1, biogeography); no A. Scott, 1909 (p.92, figs.F); ? Guangshan & Honglin, 1984 (p.118, tab.);
no Scolecithrix emarginata Farran, 1905 (p.36, figs.F);
? Amallothrix optusiformis : Dowidar & El-Maghraby, 1970 (p.267);
Scolecithricella (Amallothrix) obtusifrons : Björnberg, 1973 (p.332)
Vyshkvartzeva, 2000 (p.228, Rem.)
Espèce Pseudoamallothrix obtusifrons - Planche 1 de figures morphologiquesissued from : T. Park in Antarct. Res. Ser. Washington, 1980, 31 (2). [p.65, Fig.21]. As Scolecithricella obtusifrons.
Female: a, forehead (lateral); b, last thoracic segments and urosome (lateral left side); c, genital segment (lateral left side); d, rostrum (anterior); e, A2; f, Md; g, Mx1; h, distal part of Mx2; i, Mxp; j, P1 (anterior); k, P2 (posterior); l, P3 without two distal exopodal segments (oosterior); m, P5 (posterior).

Nota: Articulation suture separing 4th and 5th metasomal segments almost complete. Ventral margin of genital segment posterior to genital opening not strongly curved (as in P. emarginata); spermathecal vesicle (fig.21c) not fully inflated and without a separate distal sac

Espèce Pseudoamallothrix obtusifrons - Planche 2 de figures morphologiquesIssued from : G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl.L, figs.1-14]. As Scolecithrix obtusifrons.
Female (NE Atlantic): 1, habitus (dorsal); 2, idem (lateral left side); 3, rostrum; 4, rostral filament (enlarged); 5, A2; 6, Md; 7, Mx1; 8, Mx2; 9, Mxp; 10, P1; 11, P2; 12, P3; 13, endopodal segments of P4; 14, P5.

Nota Female:
- Head and 1st pedigerous segment fused, 4th and 5 th thoracic segments fused.
- Rostrum relatively strong and short, with attached 2 stong filaments ribbon-like, ending by 2 little pointed.
- Posterolateral corners of the last thoracic segment short and obtusely rounded.
- Urosome length about 1/4 of prosome.
- Genital segment about as long as the two following segments together; slightly swollen ventrally and anteriorly in the segment.
- Caudal rami slightly longer than wide , slightly obliquely truncate at apex.
- A1 shorter than the body, extens about to the anal segment.
- A2 endopod longer and more thick than exopod.
- Md strong, gnathobase with number teeth closeup.
- Mx1 with the inner lobe 1 (arthrite) orotruded and narrow.
- Mx2 of the same structure than in Amallothrix gracilis with the same sensory filaments.
- Mxp slender, distal part about as long as the 2nd basal segment.
- Swimming legs barely unlike those Amallothrix gracilis.
- P5 distinctly bisegmented with the distal segment more than 2 times as long as the proximal and slightly narrowed in the middle.; extremity conical with 3 spines: 1 inner very strong , 1 little at apex, and generally a little tooth outside, and 1 more little external. Surface of the segments without rows of hairs.

NZ: 10 + 1 douteuse

Carte de distribution de Pseudoamallothrix obtusifrons par zones géographiques
Antarct. (SE Atlant., S Pacif.), sub-Antarct. (Indian, SE Pacif.), off NW Cape Verde Is., Canary Is., Ibero-moroccan Bay, ? E Medit. (Alexandria), Azores, Bay of Biscay, off Bermuda: Station "S" (32°10'N, 64°30'W), Sargasso Sea, Woods Hole, W Indian, Philippines, Pacif. (W equatorial), Galapagos, Peru, N Chile
N: 16
(1) F: 5,6; (523) F: 6,35-5,25; {F: 5,25-6,35}
Rem.: Bathypélagique.
Certaines localisations sont discutables du fait de la confusion possible avec Pseudoamallothrix emarginata.
Voir aussi les remarques en anglais
Dernière mise à jour : 21/03/2017

 Toute utilisation de ce site pour une publication sera mentionnée avec la référence suivante :

Razouls C., Desreumaux N., Kouwenberg J. et de Bovée F., 2005-2024. - Biodiversité des Copépodes planctoniques marins (morphologie, répartition géographique et données biologiques). Sorbonne Université, CNRS. Disponible sur [Accédé le 23 avril 2024]

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