Species Card of Copepod
Calanoida ( Order )
    Arietelloidea ( Superfamily )
        Augaptilidae ( Family )
            Euaugaptilus ( Genus )
Euaugaptilus placitus  (A. Scott, 1909)   (F,M)
Syn.: Augaptilus placitus A. Scott, 1909 (p.137, Descr.F, figs.F);
non Augaptilus antarcticus Wolfenden, 1911 (p.334, 337, figs.F,M);
Augaptilus fungiferus : Wolfenden, 1911 (p.336, figs.F);
Euaugaptilus fungiferus : Björnberg, 1973 (p.348, 385);
E. perodiosus Tanaka & Omori, 1974 (p.246, figs.F); Matsuura & al., 2010 (p.2098, Table 2, 3, fig.8);
? E. laticeps : Sewell, 1947 (p.209, figs.F, juv., Rem.); Tanaka & Omori, 1967 (p.252)
Sewell, 1947 (p.209, Rem.); Matthews, 1972 (p.33, 39, 60); Boxshall, 1985 (p.306, figs.F,M, Rem.); Huys & Boxshall, 1991 (p.351)
Species Euaugaptilus placitus - Plate 1 of morphological figuresissued from : O. Tanaka & M. Omori in Publs Seto Mar. Biol. Lab., 1974, XXI (3/4). [p.246, Fig.25]. As Euaugaptilus perodiosus.
Female: a, forehead (lateral); b, last thoracic segment and urosome (lateral left side); c, A2; d, Md; e, Mx1; f, Mx2.
Nota: The urosome segments and furca are in the proportional lengths as 43:10:22:25 = 100.. Prosome and urosome are in the proportional lengths as 80:20. Furca nearly twice as long as wide. A1 extends beyond the end of furca by 5 segments.

Species Euaugaptilus placitus - Plate 2 of morphological figuresissued from : O. Tanaka & M. Omori in Publs Seto Mar. Biol. Lab., 1974, XXI (3/4). [p.199, Fig.2,g].
Female: g, mandibular teeth.

Species Euaugaptilus placitus - Plate 3 of morphological figuresissued from : R.B.S. Sewell in The John Murray Expedition, 1933-34, Scientific Reports, VIII (1), 1947. [p.210, Fig.55]. As Euaugaptilus laticeps. With doubt.
Female (from N Arabian Sea): A, A2; B, Md; C, Mx1; D, one of the spines on the 1st inner lobe (enlarged); E, Mx2; F, Mxp; G, P1; H, P5.
Nota: The proportional lengths of the anterior and posterior region as 80 to 20. The proportional lengths of the various segments of the body (cephalon to caudal rami) as 435:128:70:64:95:80:27:44:57 = 1000. A1 25-segmented, overreaches the caudal rami by several segments. In A2 the endopod id 1 ½ times the length of the exopod (8-segmented); the 1st endopodal segment is fringed with a band of hairs along its inner margin and there are a clump of hairs on the inner aspect of the 2nd segment. Endopod of Md with 6 short setae (7 in A. Scott from placitus). In Mx1 the exopod bears 3 large and 3 small setae (as described by Wolfenden in antarcticus); the 1st inner lobe with 7 spines and the 2nd inner lobe with 1 spine, all densely fringed in the distal half of their length with numerous small \"buttons\", closely crowded together (giving the appearance of a mosaic pavement). In Mx2 the various lobes bear 3, 2, 2, 3, 2, 3 setae, in addition on the 1st lobe there is a small rudimentary seta. In Mxp the distal long setae are armed with rows of \"buttons\". In P1 the basal segment 2 is without a seta on the outer border.

Species Euaugaptilus placitus - Plate 4 of morphological figuresissued from : A. Scott in Siboga-Expedition, 1909, XIX a. [Plate XLII, Figs.10-19]. As Augaptilus placitus.
Female (from Halmahera Sea): 10, habitus (dorsal); 11, forehead (lateral); 12, last thoracic and genital segments (left side); 13, rostrum; 14, A1; 15, A2; 16, Md; 17, part of one of the 6 setae of the exopodite of Mx1; 18, Mxp; 19, P5.

Species Euaugaptilus placitus - Plate 5 of morphological figuresissued from : R.N. Wolfenden in Die Marinen Copepoden der Deutschen Südpolar-Expedition 1901-1903, 1911. [p.336, Fig.71]. As Augaptilus fungiferus (?).
Female: a, posterior part cephalothorax and urosome (dorsal); b, Md (mandibular blade).

Species Euaugaptilus placitus - Plate 6 of morphological figuresissued from : R.N. Wolfenden in Die Marinen Copepoden der Deutschen Südpolar-Expedition 1901-1903, 1911. [Pl.XXXVI, Fig.8]. As Augaptilus fungiferus .
Female: 8, P1.

Compl. Ref.:
Razouls & al., 2000 (p.343, tab. 5, Appendix)
NZ: 5 + 1 doubtful

Distribution map of Euaugaptilus placitus by geographical zones
Antarct.(Indian), N Atlant., Arabian Sea, Indonesia-Malaysia, Celebes and Sulu Seas, Japan (Izu), Chile
N: 8
(5) F: 10; (10) F: 9,65-8,55; M: 9,5; (11) F: 8,33; (68) F: 9,93; (70) F: 9,9-9; {F: 8,33-10,00; M: 9,50}
Rem.: Sampling depth (Antarct.): 1000-2000 m.
For Boxshall (1985) this species is no synonym of E. laticeps as consider Sewell et Matthews. Park (1993) does not mention the case of this form in his discussion concerning E. antarcticus which he considers as a valid species, but which Boxshall (1985) judges to be a junior synonym of E. placitus.
The synonymy between E. placitus and E. perodiosus is not accepted by Walter & Boxshall (2011) in World Copepoda database.
Last update : 13/03/2011
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 Any use of this site for a publication will be mentioned with the following reference :

Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2022. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed December 09, 2022]

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