Species Card of Copepod
Calanoida ( Order )
    Arietelloidea ( Superfamily )
        Augaptilidae ( Family )
            Euaugaptilus ( Genus )
Euaugaptilus oblongus  (Sars, 1905)   (F,M)
Syn.: Augaptilus oblongus Sars, 1905 c (p.11, Descr.F);
Augaptilus rostratus Esterly, 1906 a (p.73, figs.F); Brodsky, 1950 (1967) (p.375); Owre & Foyo, 1964 (p.366); 1967 (p.88);
Euaugaptilus rostratus : Sewell, 1948 (p.558, 563); Brodsky, 1950 (1967) (p.375, figs.F); Owre & Foyo, 1967 (p.88, figs.F); Arashkevich, 1969 (p.707, figs.F); in CalCOFI regional list (MDO, Nov. 2013; M. Ohman, comm. pers.)
Augaptilus subfiligerus Wolfenden, 1911 (p.343, Descr.F); Galbraith, 2009 (pers. comm.);
Euaugaptilus subfiligerus : Sewell, 1948 (p.523);
no E. oblongus : Tanaka & Omori, 1967 (p.257, fig.F)
Sars, 1925 (p.266, figs.F,M); Sewell, 1932 (p.322); Rose, 1933 a (p.223, figs.F,M); Jespersen, 1940 (p.59, Rem.); Lysholm & al., 1945 (p.38); Sewell, 1947 (p.218, figs.F); Tanaka, 1964 b (p.55, figs.F); Vervoort, 1965 (p.139, Rem.); Grice & Hulsemann, 1967 (p.19, 34, Rem.); Owre & Foyo, 1967 (p.88, figs.F,M); Matthews, 1972 (p.38, Rem.); Tanaka & Omori, 1974 (p.243, figs.F); Park, 1993 (p.44, figs.F, Rem.); Bradford-Grieve & al., 1999 (p.882, 939, figs.F,M); Bradford-Grieve,1999 b (p.56, figs.F,M, Rem., figs.172, 190); Boxshall & Halsey, 2004 (p.67: figs.F,M); Vives & Shmeleva, 2007 (p.207, figs.F,M, Rem.)
Species Euaugaptilus oblongus - Plate 1 of morphological figuresissued from : O. Tanaka in Publs Seto Mar. Biol. Lab., 1964, XII (1). [p.56, Fig.200];
Female: a, habitus (dorsal); b, forehead (left lateral side); c, last thoracic segment and urosome (left lateral side); d, biting blade of Md; e, Mx1; f, P5.
Nota: The urosome segments and furca are in the proportional lengths as 48:12:17:23 = 100.

Species Euaugaptilus oblongus - Plate 2 of morphological figuresissued from : J.M. Bradford-Grieve in The Marine Fauna of New Zealand: Pelagic Calanoid Copepoda. National Institute of Water and Atmospheric Research (NIWA). NIWA Biodiversity Memoir, 111, 1999. [p.57, Fig.28].
Female: A, habitus (dorsal); B, idem (lateral left side); C, Md (mandibular palp); D, Mx1; E, P1; F, P5.
Nota: The specimen has 11 spines on inner lobe 1 of Mx1.

Species Euaugaptilus oblongus - Plate 3 of morphological figuresissued from : O. Tanaka & M. Omori in Publs Seto Mar. Biol. Lab., 1974, XXI (3/4). [p.244, Fig.23].
Female: a, Md; b, distal part of Mx1; c, Mx2.
Mx1 bears 9 setae on the outer lobe, 2 on the exopod, 2 on the 2nd basal segment, 2 on the 3rd inner lobe, 1 on the 2nd inner lobe, 11 on the 1st inner lobe. The 2nd basal segment, exopod and endopod of Md, and the exopod of Mx1 have numerous fine ornementation.

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

Species Euaugaptilus oblongus - Plate 5 of morphological figuresIssued from : G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl.LXXXI, figs.1-16].
Female: 1, habitus (dorsal); 2, idem (lateral left side); 3, forehead (lateral); 4, rostrum; 5, A2; 6, Md; 7, Mx1; 8, Mx2; 9, Mxp; 10, P1; 11, P3; 12, P5.

Male: 13, left A1; 14, A2; 15, P5; 16, urosome (dorsal).

Species Euaugaptilus oblongus - Plate 6 of morphological figuresissued from : R.B.S. Sewell in The John Murray Expedition, 1933-34, Scientific Reports, VIII (1), 1947. [p.218, Fig.58].
Female (from Arabian Sea): A, A2; B, Md; C, Mx1; D, Mx2; E, P1; F, P5.
Nota: The proportional lengths of the anterior and posterior region as 75 to 25. The proportional lengths of the various segments of the body (cephalon to caudal rami) as 374:134:80:77:91:107:36:52:49 = 1000. Rostrum represented by a pair of short, stout spinous prominence. A1 25-segmented, overreaches the caudal rami by about the last 5 segments. Exopod of A2 with 7 segments (the two distal fused, though a trace of the line of separation can be seen). n Md the two rami of the palp are approximately equal length; the endopod bears 6 setae distally; the proximal segments of both endopod and exopod, as well as the 2nd basal segment, are ornamented with numerous small fine bosses. In Mx1 the biting lobe is well developed and bears 9 elongate spines, of which the anterior 7 are armed with small spinules, gradually changing to small \"buttons\" distally, and 2 other delicate, smaller setae; the 2nd inner lobe bears 1 stout seta and the inner 3rd posseses a pair of sub-equal setae; the 2nd basal segment with 1 seta; endopod absent; the exopod, like the proximal segments of the exopod and endopod of the A2, is ornamented with numerous small bosses and bears distally 2 setae; the outer lobe bears 9 setae, of which the three proximal are small and delicate, the 4th is of moderate thickness, the 5th is slender, the 6th is long and stout, and the distal three are like the 4th. In Mx2 the 1 st lobe bears 3 setae and a small pointed papilla; the others lobes bear respectively 1, 2, 3, 2, 3 setae, the distal setae are fringed with small and delicate \"buttons\". In Mxp the distal setae are provided with small delicate \"buttons\".

Species Euaugaptilus oblongus - Plate 7 of morphological figuresissued from : T. Park in Biology of the Antarctic Seas, XXII. Antarct. Res. Ser., Washington, 58. [p.45, Fig.31].
Female: a-b, habitus (dorsal and lateral, respectively); c, forehead (lateral and ventral, respectively); e-f, urosome (dorsal and lateral, respectively); g, A2; h, Md; i, Md (biting edge).

Species Euaugaptilus oblongus - Plate 8 of morphological figuresissued from : T. Park in Biology of the Antarctic Seas, XXII. Antarct. Res. Ser., Washington, 58. [p.46, Fig.32].
Female: a, Mx1; b, Mx2; c, Mxp; d-h, P1 to P5 (anterior views).

Species Euaugaptilus oblongus - Plate 9 of morphological figuresissued from : C.O. Esterly in Univ. Calif. Publs Zool., 1906, 3 (5). [Pl.9, Fig.19]. As Augaptilus rostratus.
Female (from San Diego, California): 19, forehead (lateral).:

Species Euaugaptilus oblongus - Plate 10 of morphological figuresissued from : C.O. Esterly in Univ. Calif. Publs Zool., 1906, 3 (5). [Pl.11, Fig.42]. As Augaptilus rostratus.
Female: 42, urosome (lateral).

Species Euaugaptilus oblongus - Plate 11 of morphological figuresissued from : C.O. Esterly in Univ. Calif. Publs Zool., 1906, 3 (5). [Pl.12, Figs.57, 63]. As Augaptilus rostratus.
Female: 57, Md (mandibular blade); 63, P1

Species Euaugaptilus oblongus - Plate 12 of morphological figuresissued from : C.O. Esterly in Univ. Calif. Publs Zool., 1906, 3 (5). [Pl.13, Fig.75]. As Augaptilus rostratus.
Female : 75, exopod of P5.

Species Euaugaptilus oblongus - Plate 13 of morphological figuresissued from : J.M. Bradford-Grieve, E.L. Markhaseva & C.E.F. Rocha & B. Abiahy in South Atlantic Zooplankton, Edit. D. Boltovskoy. 1999. Vol.2. Copepoda. [p.1039, Fig. 7.258].
Female: Mx1.

Nota: Exo of Mx1 with 5 setae; outer lobe 1 with 7 setae.

Compl. Ref.:
Sewell, 1948 (p.330, 505, 522, 531, 533, 547); C.B. Wilson, 1950 (p.206); Grice, 1963 a (p.496); De Decker & Mombeck, 1964 (p.12); Park, 1970 (p.478); Itoh, 1970 (tab.1); Roe, 1972 (p.277, tabl.1, tabl.2); Deevey & Brooks, 1977 (p.156, tab.2, Station "S"); Vives, 1982 (p.294); Lozano Soldevilla & al., 1988 (p.60); Heinrich, 1990 (p.18); Razouls & al., 2000 (p.343, Appendix); Fernandes, 2008 (p.465, Tabl.2); Galbraith, 2009 (pers. comm.); Park & Ferrari, 2009 (p.143, Table 5, Appendix 1, biogeography); Matsuura & al., 2010 (p.2098, Table 2, 3, fig.8); Medellin-Mora & Navas S., 2010 (p.265, Tab. 2)
NZ: 16

Distribution map of Euaugaptilus oblongus by geographical zones
Antarct. (Indian), sub-Antarct. (Indian), South Africa (E), off N Ste Hélène Is., G. of Guinea, off Mauritania, Canary Is., off Madeira, Azores, Bay of Biscay, Caribbean Colombia, Caribbean Sea, off Bermuda (Station "S"), Sargasso Sea, Islande S, Strait of Denmark, Arabian Sea, Indian, Laccadive Is., Bay of Bengal, Celebes and Sulu Seas, Japan (Izu), Kuril-Kamtchatka, Vancouver Is., California, Pacif. (tropical), SW Galapagos, Pacif. (SE tropical), NE Easter Is., off Peru, New Zealand (SW North Island, SE South Island)
N: 32
(1) F: 7,4; (10) F: 4,65; (11) F: 6,15; (16) F: 6,9-5,4; M: 5,7-5,4; (17) F: 6,8; (22) F: 6,8; (48) F: 7,25-6,16; (49’) F: 5,7; (68) F: 6,33-5,97; (69) F: 6,06; (199) F: 5,93-5,92; (909) F: 6,1-6,3; {F: 4,65-7,40; M: 5,40-5,70}
Rem.: Meso-bathypelagic. Known to occur at depths between 440 and 1400 m (Matthews, 1972).
Sampling depth (Antarct., sub-Antarct.) : 0-1200 m. Sargasso Sea: 1000-1500 m (Deevey & Brooks, 1977, Station "S");
In spite of the great differences in size, Grice & Hulsemann (1967) do not doubt the synonymy between this species and Augaptilus subfiligerus. Also a close examination of E. rostratus (loaned by Scripps Institution of Oceanography) on which Esterly (1906) probably based the description of that species indicates that E. rostratus (Esterly) is identical to E. oblongus (Sars, 1905)
For Matthews (1972) and Park (1993), the form reported by Tanaka & Omori (1967) as E. oblongus is no synonym of E. rectus as is maintained by Tanaka & Omori (1974, p.252).
For Park (1993, p.47) this species can be recognized by its rostrum, which consists of a pair of short spiniform processes without filaments, the absence of setae on the first 7 segments of the A2 exopod, and the gnathobase of the mandibular blade which has a large distal tooth separate from a group of proximal teeth composed of 2 long and 2 very small spiniform teeth.
Galbraith (2009, pers. comm.) relating to Augaptilus rostratus Esterly, 1906, and Brodsky, 1950 (= Euaugaptilus rostratus) is not absolutely affirmative concerning the synonymy with Euaugaptilus oblongus, because the length of outer spine of the exopodite 1 of P1 excceds the exopodite tip (contrary to E. oblongus, shorter). A variation of the lengths of the spines is possible, but the individuals in the North-eastern Pacific correspond to ("variation" ?) E. rostratus.
First occurrence in Indonesian waters by Matsuura & al. (2010).
For Itoh (1970 a, fig.2, from co-ordonates) the Itoh's index value from mandibular gnathobase = 2460.

In ''squamatus" Group after Matthews (1972, p.64) {See remarks in Euaugaptilus genus}.
Last update : 11/07/2022
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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 May 25, 2024]

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