Species Card of Copepod
Calanoida ( Order )
    Arietelloidea ( Superfamily )
        Augaptilidae ( Family )
            Euaugaptilus ( Genus )
Euaugaptilus squamatus  (Giesbrecht, 1889)   (F,M)
Syn.: Augaptilus squamatus Giesbrecht,1889; 1892 (p.400, 413, 770, figs.F); Giesbrecht & Schmeil, 1898 (p.121, Rem. F); Wolfenden, 1911 (p.341); Lysholm & Nordgaard, 1921 (p.26);
Augaptilus brevicaudatus Sars, 1905 c (p.12); Farran, 1908 b (p.73, Rem.);
Augaptilus californicus Esterly, 1913 (p.186, figs.F); Brodsky, 1950 (1967) (p.371, figs.F, Rem.M); Suarez-Morales & Gasca, 1998 a (p108); Hernandez-Trujillo & Esqueda-Escarcega, 2002 (in Appendix);
E. californicus : Sewell, 1948 (p.558, 563); Owre & Foyo, 1964 a (p.343); 1967 b (p.86); E. laticeps (part.): Owre & Foyo, 1967 (p.86)
Ref.:
Sars, 1925 (p.261, figs.F); Rose, 1933 a (p.222, figs.F); Jespersen, 1940 (p.58); Lysholm & al., 1945 (part., p.38, 48); Sewell, 1947 (p.197, 199, 200); C.B. Wilson, 1950 (p.207); Vervoort, 1965 (p.136, Rem.); Matthews, 1972 (p.21, Descr.M, figs.M, Rem.: p. 41); Tanaka & Omori,1974 (p.253, figs.F); Bradford-Grieve & al., 1999 (p.882, 939, figs.F,M); Vives & Shmeleva, 2007 (p.211, figs.F,M, Rem.)
Species Euaugaptilus squamatus - Plate 1 of morphological figuresissued from : O. Tanaka & M. Omori in Publs Seto Mar. Biol. Lab., 1974, XXI (3/4). [p.254, Fig.28].
Female: a, forehead (lateral); b, last thoracic segment and urosome (lateral left side); c, idem (dorsal); d, exopod of A2; e, Mx1; f, Mx2.
Nota: The urosome segments and furca are in the proportional lengths as 46:12:22:20 = 100. Prosome and urosome are in the proportional lengths as 80:20. A1 extends beyond the furca by 6 segments. The species can be characterized by the short 3rd urosomal somite.


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


Species Euaugaptilus squamatus - Plate 3 of morphological figuresIssued from : G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl.LXXVIII, figs.1-13].
Female: 1, habitus (dorsal); 2, idem (lateral left side); 3, rostrum; 4, A1; 5, A2; 6, Md; 7, Mx1; 8, Mx2; 9, Mxp; 10, P1; 11, P2; 12, P5; 13, urosome (dorsal).


Species Euaugaptilus squamatus - Plate 4 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. – Fauna Flora Golf. Neapel, 1892. Atlas von 54 Tafeln. [Taf.28, Figs.1, 12, 18]. As Augaptilus squamatus.
Female: 1, A1 (distal portion); 12, A2 (anterior view); 18, Md (mandibular blade).


Species Euaugaptilus squamatus - Plate 5 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. – Fauna Flora Golf. Neapel, 1892. Atlas von 54 Tafeln. [Taf.28, Fig.34]. As Augaptilus squamatus.
Female: Mxp.:


Species Euaugaptilus squamatus - Plate 6 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. – Fauna Flora Golf. Neapel, 1892, 19 , Atlas von 54 Tafeln. [Taf.28, Fig.22]. As Augaptilus squamatus.
Female: Mx1 (anterior view).
Li = inner lobe; B2 = Basis; Ri = endopod; Re = exopod.


Species Euaugaptilus squamatus - Plate 7 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. – Fauna Flora Golf. Neapel, 1892, 19 , Atlas von 54 Tafeln. [Taf.28, Fig.25]. As Augaptilus squamatus.
Female: Mx1 (posterior view).
Le = outer lobe.


Species Euaugaptilus squamatus - Plate 8 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.1041, Fig. 7.263]. Female: Mx1. Li = inner lobe; Le = outer lobe.

Nota: Exopod of Mx1 with 7 setae.


Species Euaugaptilus squamatus - Plate 9 of morphological figuresissued from : J.B.L. Matthews in Bull. Br. Mus. (Nat. Hist.) Zool., 1972, 24 (1). [p.20, Fig.9, D-H].
Male (from 28°07'N, 14°07'W): D, habitus (dorsal); E, part of right A1 showing geniculate joint; F, Md (biting edge of mandibular gnathobase); G, exopodite of P1; H, P5 (anterior view).
D: scale II; E-H: scale III.

Nota: The last 4 segments of A1 extend past the end of urosome. The geniculate joint on the right-hand is not pronounced and the only associated modification is a spiny projection towards the distal ebnd of the segment before.
A2 lacks setae on the basipodite, but otherwise is the same like in female.
The mandibular palp is identical to that of the female and the gnathobase agrees with the figure given by Giesbrecht (1892), except that the middle and distal teeth are sharper; Sars (1925) figured an extra, fine tooyh in the proximal group.Mx1 with 11 spines on the 1st endite, while Giesbrecht (1892) figured 10 and 1 small seta and Sars (1925) showed only 9.
Mxp has one more small seta on the terminal segment than Sars (1925) has depicted.
P1-P4 are the same as Sars (1925) for female.
In the dissected specimen the right P5 lacks a spine on the 1st exopodite segment (almost certainly due to loss). The spiny projection on the end of this ramus is about twice as long as the terminal spine and the projection on the inner margin of the 2nd segment is small, with a feeble tip and with some associated setules just distal to it. The lef-hand limb is quite usual for the genus.

For Matthews, the specimens agree so closely with the female of E. squamatus

Species Euaugaptilus squamatus - Plate 10 of morphological figuresIssued from : C.O. Esterly in Univ. Calif. Publs Zool., 1913, 11 (10). [Pl. 10, Figs. 4, 22]. As Augaptilus californicus.
Female (from S California): 4, abdomen (lateral); 22, forhead (lateral).

Nota: Last thoracic segment rounded laterally.
Cephalothorax four and one-half times as long as abdomen.
Genital segment protrudes on the ventral surface and the aperture surrounded by hairs; the segment is as long as the other two together and more than 3 times as long as the 2nd segment.
A1 24-segmented, 7.3 mm long
The inner ramus of A2 is less than twice the length the outer.
Cephalothorax length: 5 mm.
Body very transparent, the 20th segment of A1 with a brown band around.


Species Euaugaptilus squamatus - Plate 11 of morphological figuresIssued from : C.O. Esterly in Univ. Calif. Publs Zool., 1913, 11 (10). [Pl. 11, Figs. 31, 40]. As Augaptilus californicus.
Female: 31, Md (mandibular blade); 40, A2.

Nota: The blade of Md is elongated.


Species Euaugaptilus squamatus - Plate 12 of morphological figuresIssued from : C.O. Esterly in Univ. Calif. Publs Zool., 1913, 11 (10). [Pl. 12, Figs. 43, 48]. As Augaptilus californicus.
Female (from S California): 43, exopod of P1; 48, P5.
Exopod length of P1: 571 µm. P5 length: 1.114 mm.


Species Euaugaptilus squamatus - Plate 13 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. – Fauna Flora Golf. Neapel, 1892. Atlas von 54 Tafeln. [Taf.39, Fig.38]. As Augaptilus squamatus.
Female: 38, urosome (ventral).

Compl. Ref.:
Sewell,1948 (p.505, 547, 550, 559, 560); ? C.B. Wilson, 1950 (p.207); Grice & Hulsemann, 1965 (p.224); Roe, 1972 (p.277, tabl.1, tabl.2); 1972 c (p.1035: Rem.); ? Harding, 1974 (p.141, Table 3, gut contents); Vives & al., 1975 (p.50, tab.II, XII); Deevey & Brooks, 1977 (p.156, tab.2, Station "S"); Vives, 1982 (p.294); Lozano Soldevilla & al., 1988 (p.60); Heinrich, 1990 (p.18); Holmes, 2001 (p.12); in CalCOFI regional list (MDO, Nov. 2013; M. Ohman, comm. pers.)
NZ: 11

Distribution map of Euaugaptilus squamatus by geographical zones
Loc:
off Tristan da Cunha Is., off N Trindade Is., G. of Guinea, off NE St. Paul Is., off Mauritania, Canary Is., Azores, off Portugal, Ibero-moroccan Bay, off W Ireland, S Iceland, Caribbean Sea, Florida, off Bermuda (Station "S"), ? off E Cape Cod, Sargasso Sea, Philippines, Japan (Izu region), California, Pacif. (tropical), Marshall Is., E Tuamotu Is., SW Galapagos, off Peru, Pacif. (SE tropical), E Easter Is.
N: 15
Lg.:
(1) F: 6,3; (22) F: 5,8; M: 4,5; (16) F: 5,8-5,4; (46) F: 6,8; (68) F: 7,2; 7,41; (144) F: 5,8; (199) F: 6,72-6,23: M: 6,4-5,93; {F: 5,40-7,41; M: 4,50-6,40}
Rem.: meso-bathypelagic. Usually obtained below about 500 m (Matthews, 1972). Satgasso Sea: 500-2000 m (Deevey & Brooks, 1977, Station "S"); In vertical tow (Harding, 1974, Rem.: species identification with doubt)
This species was designated by Sars as the type of the genus. For matthews (1972, p.41) since Sars originally confused this species with E. magnus the samples from Michael Sars Expedition (1910) have been re-examined.
Could have been confused with Euaugaptilus magnus.
For Vervoort (1965, p.137), this species, in external appearance, is near to E. oblongus (Sars), fom which it differs in the squarish shape of the body, the very short 2nd urosomal segment, the slightly longer rostral points and structural differences of Mx1.
For Matthews (1972, p.42) the description of E. squamatus by sars (1925) differs from Giesbrecht's description: the spine on the 2nd exopodite segment of P1 is absent in Sars; Sars figured 7, instead of 8 setae on the endopodite of P5; Sars figured an extra tooth on the mandibular gnathobase. These differences seem to be part of the natural variation, but the condition described by Giesbrecht was the more common in the specimens examined by Matthews.

In ''squamatus" Group after Matthews (1972, p.64) {See remarks in Euaugaptilus genus}.
Last update : 03/02/2016
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