Scolecocalanus spinifer - Species Card - Marine Planktonic Copepods

Species Card of Copepod

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

Scolecocalanus spinifer C.B. Wilson, 1950 (F,M)

Abbreviations or symbols

Syn.:

? Scottocalanus longispinus (M): Farran, 1936 (p.98, figs.M)

Ref.:

(

List of the studied authors )

C.B. Wilson, 1950 (p.336, figs.F,M); Bradford & al., 1983 (p.114); Vervoort, 1990 (p.184: Rem.); Vyshkvartzeva, 2001 (p.80: Rem.)

Issued from : W. Vervoort in Beaufortia, 1990, 41 (25). [p.184]. Characteristics between the females S. spinifer and S. stocki Vervoort, 1990.

Species Scolecocalanus spinifer - Plate 2 of morphological figures

issued from : C.B. Wilson in Bull. U.S. natn Musl., 100, 14 (4), 1950. [Pl.35, Figs.528-530].
Female (from off Hong Kong): 528, habitus (lateral left side); 529, idem (dorsal); 530, P5.

Nota: The female can be identified easily by the spine on the genital segment.

Diagnosis:
- Metasome elliptical, 2 and 1/2 times as long as wide;
- Head and pedigerous segment 1 fused, 4th and 5th pediger segments partially fused
- Forehead armed with a high galeate (helmet-shape) crest , which extends back on to the dorsal surface of the head.
- Posterior corners of last thoracic segment extending back beyond the center of the genital segment, and the posterior margin deeply reentrant on the dorsal surface.
Urosome 4-segmented.
- Genital segment asymmetrical , being produced outward and backward on the right side, the right posterior corner ending in an acute spine, which extends back over the 1st abdominal segment and nearly reaches its posterior margin, and is prominent in both dorsal and lateral views.
- Anal segment very short, and reentrant at the center of its posterior margin.
- Caudal rami wider than long, somewhat divergent; each ramus with 5 terminal setae.
- A1 reach beyond the tips of the caudal rami by 2 segments.
- Exopod of A2 1/2 longer than the endopod; the end segment longer than the 2 nd.
- Mx2 with 5 lateral lobes, with very long setae and 3 short terminal segments.
- Mxp 7-segmented and tapers regularly from base to tip, sparsely setose.
- P1 to P4 with 3-segmented exopods and endopods.
left P5 only present (as in Farran's two species); basal segment with a small finger process at the distal end on the anterior surface, and the long curved terminal spine without trace of spinules or hairs on either margin.

Species Scolecocalanus spinifer - Plate 3 of morphological figures

issued from : C.B. Wilson in Bull. U.S. natn Mus., 100, 14 (4), 1950. [Pl.35, Fig.531].
Male: 531, P5.

Nota: In the right leg of P5 the basipod 2 is swollen, endopod 1-segmented and nearly reaches the tip of the exopod, and the latter is 2-segmented, the first segment one-half longer than the second; the end segment is swollen distally into 3 lobules, flattened on the inner surface, and is tipped with a small spine; The left leg of P5 is about the same length as the right, the basipod 2 twice the length of the 1st segment, and the two combined almost reach the distal end of the 1st segment of the right exopod; the left exopod is 2-segmented, the 2nd segment longer than the first, swollen at its tip and armed with 2 or 3 spines; the left endopod is 1-segmented and almost as long as the exopod, the tip curved over and pressed into the shape of the bowl of a ladle.

- Frontal crest a little longer than in female and extends farther back on the dorsal surface.
- 5th thoracic segment more fully separated from the 4th, and its posterior corners are smoothly rounded, with a small curved spine nearer the ventral surface.
- Caudal rami being on a level with the ventral surface are depressed far below the dorsal surface.
- A1 reach the 2 nd abdominal segment, and no geniculate.
- A2, mouthparts and P1 to P4 like those of female.

NZ:

Distribution map of Scolecocalanus spinifer by geographical zones

Distribution map of Scolecocalanus spinifer for the Zone China Seas, Vietnam

Loc:

(

Geographical glossary )

China Seas (South China Sea, off Hong Kong), ? Great Barrier Reef
Locality type: 20°19'30'' N, 121°51'15'' E.

Lg.:

(

References of the authors concerning dimensions )

(137) F: 4,38; M: 4,25 ; {F: 4,38; M: 4,25}

Rem.:

For Vyshkvartzeva (2001) the male, figured by Farran (1936 a), belongs to this species.

Last update : 27/02/2017


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