Species Card of Copepod
Calanoida ( Order )
    Arietelloidea ( Superfamily )
        Arietellidae ( Family )
            Crassarietellus ( Genus )
Crassarietellus sp.  Ohtsuka, Boxshall & Roe, 1994   (M)
Syn.: Scottula abyssalis (M) : Sars, 1925 (p.339, fig.M); Rose, 1933 a (p.243, fig.M);
Sarsarietellus abyssalis (M) : Campaner, 1984 (p.107)
Ohtsuka & al., 1994 (p.116, Descr.M, figs.M)
Species Crassarietellus sp. - Plate 1 of morphological figuresissued from : S. Ohtsuka, G.A. Boxshall & H.S.J. Roe in Bull. nat. Hist. Lond. (Zool.), 1994, 60 (2). [p.117, Fig.7].
Male (from Zool. Mus. Oslo, labeled as Scottula abyssalis): A, left A1; B, idem (segments XIX to XXVIII); C, idem (segments XXIV-XXVIII); D, A2; E, Md (mandibular palp); F, Md (mandibular gnathobase cutting edge).
Scale bars in mm.

Nota: Integument of urosome and appendages pitted as in C. huysi
Left A1 geniculate between ancestral segments XX and XXI, fringed with setules along posterior margins of segments I-X, transverse row of setules on each segments IV to VIII; Segment XXV incompletely fused with XXVI. Sutures between segment I to IV weakly visible. Right A1 as in female of C. huysi.
A2: basis with serrate inner seta; endopod 2-segmented, 1st segment with short, inner seta at 3/4 length and numerous spinules subterminally, 2nd segment with 3 inner setae of unequal lengths an d 5 setae terminally, covered almost entirely with spinules; exopod indistinctly 10-segmented, 8th segment fringed with minute spinules along both sides; setal formula of exopod 0, 0, 0, 1, 1, 1, 1, 1, 0, 3.
Md: mandibular gnathobase with 3 stout teeth, dorsalmost of which bifid at tip; tuft of long setules present near base of palp. Mendibular palp with basis elongate, furnished with numerous minute spinules and row of long setules along inner margin; endopod rudimentary, 1-segmented, bearing 2 unequal setae; seta on 1st exopod segment not reduced0 5th segment with 2 developed setae.

Species Crassarietellus sp. - Plate 2 of morphological figuresissued from : S. Ohtsuka, G.A. Boxshall & H.S.J. Roe in Bull. nat. Hist. Lond. (Zool.), 1994, 60 (2). [p.118, Fig.8].
Male: A, praecoxal arthrite and coxal endite of Mx1; B, endopod of Mx1; C, 1st and 2nd praecoxal endites of Mx2; D, basal spine of Mx2; E, 4th to 6th endopod segments of Mxp (inner seta on 4th and 5th segments indicated by arrowhead); F, P1 (anterior); G, P2 (anterior); H, outer distal process on 2nd exopod segment of P3; I, outer process on 2nd endopod segment of P3; J, P5 (anterior, ancestral 2nd and 3rd segments of right exopod missing).
Scale bars in mm.

Nota: Mx1 praecoxal arthrite with 5 serrate spines and 1 process, with numerous spinules of variable sizes on both sides and patch of setules; coxal endite with long, serrate seta; coxal epipodite bearing 6 setae.
Mx2: 1st and 2nd syncoxal endites (fig.8C) having 2 setae and vestigial element, and 2 spinulose setae, respectively; basal spine (fig.8D) with 3 rows of spinules at midlength.
Mxp : 4th and 5th endopod elements each with non-reduced innermost seta, 6th segment with setae a and b well developed.
P5: Coxae incompletely fused with intercoxal sclerite; basis separate from coxa, bearing outer plumose seta at midlength. Right leg lacking endopod; exopod missing distal segment (s), at least, 2-segmented, 1st segment with spinulose spine and pointed process at distal angle. left leg with indistinctly 2-segmented endopod, 1st segment large, 2nd hemispherical with minute prominence terminally; exopod 3-segmented, 1st segment with spinulose spine and pointed process on distal corner, 2nd segment expanded, carrying outer spinulose spine at midlength, 3rd segment small, tapering distally, with 1 minute basal element, 2 short medial setae along outer margin and terminal spine as long as 2nd 2nd segment.

Species Crassarietellus sp. - Plate 3 of morphological figuresIssued from : G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl.CXXII, figs.1-15]. As Scottula abyssalis.
Male (off Lisboa): 15, P5.

NZ: 1

Distribution map of Crassarietellus sp. by geographical zones
NE Atlant. (off Cape St. Vincent)

Type locality: 38°02'N, 10°44'W)
N: 1
(263) M: 2,88; (307) M: 2,8; {M: 2,80-2,88}
Rem.: Perhaps Crassarietellus huysi male, because the locality near from of C. huysi females. The ratio of the sizes (M/F): 0.735 seems inferior to the values usually observed, but possible as male of C. huysi.
Last update : 02/01/2015
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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 19, 2024]

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