Neoscolecithrix sp. - Species Card - Marine Planktonic Copepods

Species Card of Copepod

Calanoida ( Order )	details
Clausocalanoidea ( Superfamily )	details
Scolecitrichidae ( Family )	details
Neoscolecithrix ( Genus )	details	List species for this Genus

Neoscolecithrix sp. Bradford, 1973 (F, Juv.5 F)

Abbreviations or symbols

Ref.:

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List of the studied authors )

Bradford, 1973 (p.147, figs. juv.V F); Bradford & al., 1983 (p.124, figs. Juv.5); Hulsemann, 1985 (p.60, 61, Rem.); Bradford-Grieve, 2001 a (p.782, figs.F, Rem.)

Species Neoscolecithrix sp. - Plate 1 of morphological figures

issued from : K. Hulsemann in Polar Biol., 1985, 5. [p.61, Table 2].
Selected characters in females. B = basipod; Ri = endopod; Re = exopod; + data from immature specimen.

Species Neoscolecithrix sp. - Plate 2 of morphological figures

issued from : J.M. Bradford-Grieve in N. Z. J. mar. Freshw. Res., 2001, 35. [p.783, Fig.1]. As Neoscolecithrix Cf. magna.
Female (from 41°04.67'S, 176°23.48'): A-B, habitus (dorsal and lateral, respectively); C, rostrum (lateral); D, rostrum (posterior); E, urosome (ventral); F, urosome (right side; G, caudal ramus (ventral); H, idem (dorsal); I, P5 (anterior view); J, right terminal segment of P5 (posterior view).

Nota: Head and pedigerous somite 1 fused, 4 and 5 separated. Genital double somite and following 2 somites apparently covered in large, rounded scales (presence of these in many cases inferred from small attachment location as many scales had apparently dropped off). Urosomite 3 (abdominal segment 2) and urosomite 4 (abdominal segment 3) posterior borders fringed with rounded scales. Anal somite small, appears to be fused with caudal rami dorsally

Species Neoscolecithrix sp. - Plate 3 of morphological figures

issued from : J.M. Bradford-Grieve in N. Z. J. mar. Freshw. Res., 2001, 35. [p.784, Fig.2]. As Neoscolecithrix Cf. magna.
Female: A, A1; B, A2; C, Md (gnathobase); D, Md (masticatory edge); E, Md (mandibular palp); F, Mx1; G, left Mx2; H, terminal part of right Mx2.

Nota: A1 24-segmented, extending to posterior border of pedigerous somite 3. A2 endopod just greater than half length of exopod; coxa and basis separate; endopod 2-segmented; exopod 4-segmented. Mx1 praecoxal arthrite with 4 posterior surface setae as well as 10 marginal spines and setae; coxal endite and basal endites 1 and 2 with 3, 4, 5 setae respectively; basis and endopod segments fused; endopod with 3 + 7 setae; exopod with 10 setae; basal exite without seta; coxal epipodite with 9 setae. Mx2 praecoxa with an outer distal protrusion; 5 endites; endopod with 5 very long, wide, worm-like sensory setae on both sides and 3 shorter, brush-like sensory setae on right and 2 brush-like and 1 very short (brush-like ?) sensory seta on left.

Species Neoscolecithrix sp. - Plate 4 of morphological figures

issued from : J.M. Bradford-Grieve in N. Z. J. mar. Freshw. Res., 2001, 35. [p.785, Fig.3]. As Neoscolecithrix Cf. magna.
Female: A, right Mxp (coxa flattened); B, left praecoxa and coxa of Mxp; C, detail of setation of coxal endite 2; D, P1 (anterior view); E, P2 (posterior); F, right basis of P2 (posterior); G, P3 (posterior); H, P4 (posterior).

NZ:

Distribution map of Neoscolecithrix sp. by geographical zones

Loc:

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Geographical glossary )

New Zealand, SE North Island

Lg.:

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References of the authors concerning dimensions )

(592) juv.5 F: 3,20; (872) F: 4,2; {F: 4,20}

Rem.:

hyperbenthic (600 m, 300-450 m).
? Perhaps Oothrix (= Neoscolecithrix) magna Grice, 1972.
For Bradford-Grieve (2001 a, p.786) a notable feature of the SW Pacific specimen is the large scales onthe urosome. Grice (1972) notes that in N. magna the ‘’urosome segment and furcae pitted’’ ; these pits may be the location of attchment of scales that have been damaged but we do not know the nature of any decoration.
The present specimen appears to differ from the description of N. magna in the following points : Md with 4 setae, one of them very small (N. magna is illustrated as having 3 setae) ; Mx1 endopod with total of 10 setae (N. magna is illustrated as having 8) ; basis of P1 with 2-3, of P2 with 2-4, of P3 with 1 posterodistal spine (N. magna with 4, 5, 2 spines respectively) ; P5 has numerous long outer posterior hairs along whole proximal border of right leg terminal segment (N. magna has hairs also asymmetrically placed but fewer in number and not inserted parallel to the outer border, nor along whole border). Inner edge of terminal segment without hairs on right side, with very few hairs on left side (N. magna with more numerous short hairs on inner borders on both sides). Examination of the female specimen of N. magna deposited at the Smithsonian Institution confirmed that N. magna also has an additional small seta on the basis of the mandibular palp and that there are 10 setae on the endopod of M1.
The present specimen is considered to be the adult female of the Neoscolecithrix copepodite V described by Bradford (1973).

Last update : 24/01/2015


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