Scaphocalanus sp. Tanaka - Species Card - Marine Planktonic Copepods

Species Card of Copepod

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

Scaphocalanus sp. Tanaka, 1961

Abbreviations or symbols

Ref.:

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List of the studied authors )

Species Scaphocalanus sp. - Plate 1 of morphological figures

issued from : O. Tanaka in Publ. Seto Mar. Biol. Lab., 1961, IX (1). [p.174, Fig.119, a-g]. As Scaphocalanus subbrevicornis.
Female (from Japan: Izu Region): a, habitus (dorsal); b, last thoracic segment and urosome (lateral, left side); c, exopod of P1; d, P2; d', 1st and 2nd segments of exopod of P2 (enlarged); e, P3 (part.); f, P5; g, P5 (other specimen).
Nota:
- Cephalothorax and abdomen in proportional lengths 76 : 24.
- Last thoracic segment with postero-lateral corner obtusely triangular.
- Rostral filament long and slender.
- Urosomal segments and caudal rami in proportional lengths 31 : 22 : 20 : 9 : 18 = 100.
- Genital segment about as long as wide;
- Endopod of A2 about as long as the exopod (50 : 47).
- P2 with the outeredge spine on the 1st segment of the exopod short, about 1/3 the length of the outer margin of the 2nd segment of the exopod, and slightly curved inwards.Terminal spine of P2 with 24 teeth. No small triangular spines on the posterior surface of the basal segments, but there are scattered small spines on the anterior surface of these segments.
- P5 2-segmented; distal segment slender; terminal spine longer than the segment itself; inner marginal spine is about 1.8 times as long as the segment, and rather finely toothed on the outer margin; the number of teeth about 32.
Rem: Other specimen had P5 fusnished with 2 small spines on the outer margin, 1 at the base of the terminal spine, and the other on the distal 1/4 of the outer margin.

Species Scaphocalanus sp. - Plate 2 of morphological figures

issued from : O. Tanaka in Publ. Seto Mar. Biol. Lab., 1961, IX (1). [p.174, Fiig.119, h-k]. As Scaphocalanus subbrevicornis.
Male (from Japan: Izu Region): h, P2; i, P3 (part.); j, P5; k, distal segment of left P5.
Nota:
- Cephalothorax and urosome in proportional lengths 68 : 32.
- Head and pediger segment 1 fused, 4th and 5th incompletely separated.
- Last thoracic segment with lateral distal corner rounded.
- Rostral filament attenuates gradually into a fine point.
- Urosome 5-segmented; urosomal segments and caudal rami in proportional lengths 10 : 29 : 25 : 23 : 2 : 11 = 100. The 3rd abdominal segment usually longer than the 4th.
- Left A1 20-segmented (segments 8-10 fused, 11-13 fused, 24-25 fused); right A1 19-segmented, extends to the end of the 3rd urosomal segment.
- Exopod of A2 about as long as the endopod.
- Md with exopod as long as the endopod.
- Mx1 with 5 setae on exopod, 7 long and 2 short setae on the outer lobe; endopod and inner lobes reduced.
- Mx2 reduced, with soft-skined filaments on the distal segments.
- Terminal spine of exopod of P2 with 34 teeth.
- P5 extends to the distal margin of the 3rd urosomal segment; right leg with a short endopod which extends slightly beyond the distal margin of the 2nd basal segment of the left leg; 1st segment of the exopod has a fairly long process on the distal margin ofthe segment; Tthe endopod of left leg 1-segmented, but there is a slight notch on the middle of the outer margin where the segment swollen outwardly; the distal segment of exopod of the left leg as figured (k).

issued from : O. Tanaka in Publ. Seto Mar. Biol. Lab., 1961, IX (1). [p.175]. As Scaphocalanus subbrevicornis.
Male: Proportional lengths of the segments of A1.

NZ:

Distribution map of Scaphocalanus sp. by geographical zones

Loc:

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Geographical glossary )

Japan (Izu Region)

Lg.:

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References of the authors concerning dimensions )

(108) F: 1,95; 2,03; M: 1,65-1,8; {F: 1,95-2,03; M: 1,65-1,80}

Last update : 22/03/2017


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