Scolecithricella spinata - Species Card - Marine Planktonic Copepods

Species Card of Copepod

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

Scolecithricella spinata Tanaka, 1962 (F)

Abbreviations or symbols

Syn.:

Amallothrix spinata : Kuriyama & Nishida, 2006 (p.293, 299: Tab.II; p.309: Tab.III, fig.7, 10, vertical distribution).

Ref.:

(

List of the studied authors )

Tanaka, 1962 (p.81, Descr.F, figs.F); Bradford, 1973 (p.143); Bradford & al., 1983 (p.78, Rem.); Vyshkvartzeva, 1999 (2000) (p.235); Vives & Shmeleva, 2007 (p.787, figs.F, Rem.)

Species Scolecithricella spinata - Plate 1 of morphological figures

issued from : O. Tanaka in Publ. Seto Mar. Biol. Lab., 1962, X (1). [p.82, Fig.147].
Female (from Suruga Bay): a, habitus (dorsal); b, forehead (left lateral side); c, last thoracic segment and urosome (left lateral side); d, rostrum (dorsal view); e, Mx2; f, Mxp; g, PP1; i, P3; j, P5.

Nota Female:
- Cephalothorax about 3.92 times the abdomen length.
- Abdomen 4-segmented; segments and caudal rami in the proportional lengths 48 : 16 : 15 : 5 : 16 = 100.
- Genital segment slightly swollen ventrally.
- Caudal rami 1.2 times as long as wide.
- A1 broken.
- A2 exopod 1.4 times as long as endopod.
- Mx1 with 9 setae on the outer lobe; 8 setae on exopod; 5 setae on endopodal segments 2-3 and 3 setae on the endopodal segment 1; 5 setae on the 2nd basal segment; 4 setae on the 3rd inner lobe; 2 setae on the 2nd inner lobe.
- Mx2 with 3 vermiform and 4 bud-like sensory filaments on the segments of endopod.
- Mxp with a row of spinules on the anterior margin of the 2nd basal extending to the middle of the segment; endopodal segment rather short.
- P1 with the outer edge spine on the exopodal segment slender; on the 1st segment of exopod, the spine which is as long as the outer margin of the 2nd segment.
- P2 with a long and curved spine on the 1st exopodal segment; the proximal half of the outer margin of the 1st basal segment (coxa) is swollen.
- P3 with coxa fusnished with rather long spinules on basal region of the inner marginal seta, and both the inner and outer margins of the segment provided with minute denticles; posterior surface of exopod and endopod covered with groups of minute spines; terminal spine of exopod coarsely toothed (26 teeth).
- P4 with seta on the coxa.
- P5 3-segmented but the separation between the segments feeble; distal segment with rayher a feeble inner marginal spine; apical and outer marginal spines small; inner marginal spine about as long as the distal segment; the outer marginal spine arises opposiye to the inner marginal one.

issued from : O. Tanaka in Publ. Seto Mar. Biol. Lab., 1962, X (1). [p.81].
Female: Proportional lengths of segments 1 to 15 of A1 (antennula broken).

Compl. Ref.:

(

List of the studied authors )

Grice & Hulsemann, 1967 (p.17); Vives, 1982 (p.292)

NZ:

Distribution map of Scolecithricella spinata by geographical zones

Distribution map of Scolecithricella spinata for the Zone Indian Ocean

Species Scolecithricella spinata - Distribution map 2

Chart of 1996

Loc:

(

Geographical glossary )

off Madeira, off SW Portugal (in Vives, 1970, 1982), W Indian, Japan (Suruga Bay, Sagami Bay)

Lg.:

(

References of the authors concerning dimensions )

(117) F: 1,77; (1000): F: 1,9 ± 0,1; {F: 1,77-2,0}

Rem.:

Meso-bathypelagic.
Probable in the Genus Amallothrix.
After Tanaka (1962, p.83) the species resembles Scolecithrix valida Farran (= Amallothrix valida), but can be distinguished from the latter by the presence of spinules at the base of the inner marginal spine of the coxa of P2 and also by the incompletely 3-segmented P5 which has a feeble inner marginal spine on the distal segment.

Last update : 18/01/2021


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