Tharybis compacta - Species Card - Marine Planktonic Copepods

Species Card of Copepod

Calanoida ( Order )	details
Clausocalanoidea ( Superfamily )	details
Tharybidae ( Family )	details
Tharybis ( Genus )	details	List species for this Genus

Tharybis compacta (Grice & Hulsemann, 1970) (F,M)

Abbreviations or symbols

Syn.:

Undinella compacta Grice & Hulsemann, 1970 (p.195, figs.F,M); Bradford-Grieve, 2004 (p.285)

Ref.:

(

List of the studied authors )

Schulz, 1981 (p.169, 171, Rem.); Bradford & al., 1983 (p.126, Rem.: p.127); Schulz & Beckmann, 1995 (p.210); Andronov, 2002 (p.37, figs.F,M); Ferrari & Markhaseva, 2005 (p.46: tab.1)

Species Tharybis compacta - Plate 1 of morphological figures

issued from : V.N. Andronov in Arthropoda Selecta, 2002, 11 (1). [p. 36, Figs.139-146]. After Grice & Hulsemann, 1970.
Female: 139-140, habitus (dorsal and lateral, respectively); 141, P5.

Male: 142-143, habitus (lateral and dorsal, respectively); 144, P5; 145, exopod of left P5; 146, distal part of right P5.

Species Tharybis compacta - Plate 2 of morphological figures

Issued from : G.D. Grice & K. Hülsemann in Bull. Mus. Comp. Zool., Harvard, 1970, 139 (4). [p.220-221, Pl. XII, Figs. 228-241]. As Undinella compacta.
Female (from 39°45.2'N, 70°33.8'W): 228-229, habitus (dorsal and lateral, respectively); 230, right A1; 231, A2; 232, Md palp; 233, Md (masticatory edge); 234, Mx1; 235, Mx2; 236, Mxp; 237, P1; 238, P2; 239, P3; 240, P4; 241, P5.

Nota: - Head and 1st thoracic segment separated dorsally by fine line, 4th and 5th fused.
- Abdomen 4-segmented, anal segment very small.
- Rostrum or filaments absent.
- Posterolateral corners of 5th thoracic segment rounded with shallow indentation.
- A1 not quite reaching end of cephalothorax, 24-segmented, segments 8 and 9 fused, incompletely separated from segment 10.
- Exopod of A2 2 times the length of endopod.
- Basal segment of Md palp with 2 coarse and 1 long slender setae; endopod longer than exopod; gnathobase with 7 monocuspidate teeth and 1 thick seta.
- Mx1 with 12 spines on 1st inner lobe; 3 setae on 2nd inner lobe; 4 setae on 3rd inner lobe; 3 setae on 2nd basal segment; 2 and 5 setae on endopod; 3 setae on exopod.
- Mx2 with lobes and endopod located in distal half of appendage.
- Mxp with 2nd basal segment about as long as 1st, thickened in proximal half.
- Endopod of P1 1-segmented, of P2 2-segmented, of P3 and P4 and exopods of P1 to P4 3-segmented.
- Posterior sides of P2 to P4 with few spinules.
- P5 3-segmented; distal segment slender with 1 coarse terminal spine and 1 terminal spine-like point; distal segment, measured to the insertion of the spine, 1.5 times the length of preceding segment.

Species Tharybis compacta - Plate 3 of morphological figures

Issued from : G.D. Grice & K. Hülsemann in Bull. Mus. Comp. Zool., Harvard, 1970, 139 (4). [p.222-223, Pl. XIII, Figs. 242-257]. As Undinella compacta.
Male:242,-243, habitus (dorsal and lateral, respectively); 244, left A1; 245, A2; 246, Md palp; 247, Md (masticatory edge); 248, Mx1; 249, Mx2; 250, Mxp; 251, P1; 252, P2; 253, P3; 254, P4; 255, P5; 256, exopod of left P5; 257, distal portion of right P5.

Nota: - Head and 1st thoracic segment separated dorsally by fine line, 4th and 5th fused.
- Abdomen 5-segmented, anal segment very short.
- Rostrum or filaments absent.
- Posterolateral margin of 5th thoracic segment angular with rounded tip.
- A1 reaching posterior end of 2nd abdominal segment; segments 8-10 and 20-21 fused in right A1, segments 8-10 only fused in left A1. Sensory appendages on segments 2, 3, 5, 7 and 9.
Other appendages and swimming legs as in female.
- P5 large, exceeding end of caudal rami. In right P5, 2nd and 3rd exopodal segments fused to one slender segment bearing a hump posteriorly in the distal half, terminal segment flattened; endopod lacking. In left P5 basipod large; endopod 1-segmented, about twice as long as 3-segmented exopod; terminal segment of exopod slender, with lamella reinforced by ''veins'' especially at the tip.

NZ:

Distribution map of Tharybis compacta by geographical zones

Loc:

(

Geographical glossary )

NW Atlant. (S off Woods Hole).
Type locality: 39°45.2' N, 70°33.8' W.

Lg.:

(

References of the authors concerning dimensions )

(200) F: 1,28-1,16; M: 1,22-1; {F: 1,16-1,28; M: 1,00-1,22}

Rem.:

hyperbenthic. (1750-1822 m).
The change of the genus does not seem to be absolutely assured.Undinella compacta approaches the genus Tharybis in the relatively large 1st inner lobe (= arthrite) of Mx1, the swollen 2nd basipodal segment of Mxp, and the elongate terminal segment of P5. However, this present species is placed in the genus Undinella because the Head and 1st thoracic segment and4th and 5th thoracic segments partially separatd, the exopod of Mx1 with 3 setae, and the lobes of Mx2 crowded within the distal half of the appendage. The absence of a rostrum and rostral filaments is unique in the family Tharybidae.

Last update : 31/03/2016


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