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Calanoida ( Order ) |
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Clausocalanoidea ( Superfamily ) |
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Diaixidae ( Family ) |
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Diaixis ( Genus ) |
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Diaixis asymmetrica Grice & Hulsemann, 1970 (F,M) | |
| | | | | | | Ref.: | | | Grice & Hulsemann,1970 (p.193, figs.F); Andronov, 1979 (p.99, figs.F); Bradford & al., 1983 (p.122); Andronov, 2002 (p.17, figs.F,M, Descr.M); Markhaseva & al., 2010 (p.118, 121: Rem.). |  issued from : V.N. Andronov in Arthropodia Selecta, 2002, 11 (1). [p.15, Fig. 1-12]. Female (from Atlantic): 1-2, habitus (dorsal and lateral, respectively); 3, thoracic segments 4 and 5 and genital segment (dorsal); 4, urosome (ventral); 5-6, thoracic segment 5 (right and left views, respectively); 7-8, idem; 9, one of bruch-like setae on endopod of Mx2; 10, P4; 11, rostrum (from 80); 12, rostrum (from 38). Nota: 7-8, 11, origin, the rest of figures after Andronov (1979). SW Atlantic , Walwiw Ridge, from the samples 38 (30°40' E, 14°50'E) and 80 (42°10'S, 00°18'E).
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 issued from : V.N. Andronov in Arthropodia Selecta, 2002, 11 (1). [p.16, Fig. 13-27]. Male: 13-14, habitus (dorsal and lateral, respectively); 15, rostrum; 16, Thoracic segments 4 and 5 and genital segment (dorsal); 17-18, thoracic segment 5 (right and left, respectively); 19, A1; 20, Mx1; 21-25, P1 to P5.; 26-27, distal end of left P5 (different views). Origin: SW Atlantic, Walvis Ridge (sample 80)
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 Issued from : V.N. Andronov in Byull. Mosk. Obshch. Ispyt. Prir. , Otdel Biol., n. ser., 1979, 84 (4). [p.98, Figs.6-15]; As Diaixis asymmetrica ? Female (from W South Africa): 6, habitus (lateral); 7-8, last thoracic segments (right and left sides, respectively); 9, Md; 10, urosome (ventral); 11, P4 (incomplete); 12, genital segment (ventral); 13, A2; 14, one of brush-like setae of Mx2.; 15, rostrum.
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 Issued from : G.D. Grice & K. Hülsemann in Bull. Mus. Comp. Zool. Harvard., 1970, 139 (4). [p.214-215, Pl. IX, Figs.172-190]. Female (from 39°45.2'N, 70°33.8'W): 172-173, habitus (lateral and dorsal, respectively); 174, urosome (ventral); 175, 4th and 5th thoracic segments and urosome (left side); 176, 5th thoracic segment and genital segment (right side); 177, left A1; 178, A2; 179, Md palp; 180, Md (gnathobase); 181, Mx1; 182, Mx2 (only sensory setae shown); 183, Mx2 (other side, sensory setae omitted); 184, Mxp (setae on endopod omitted); 185, Mxp (endopod); 186, P5; 187, P2 (exopod broken off); 188, left P3 (endopod broken off); 189, right P3 endopod; 190, P4 (incomplete). Nota: - Head and 1st thoracic segment separate, 4th and 5th separate. - Abdomen 4-segmented, anal segment very small. - Rostrum divided, without filaments. - Posterolateral corners of cephalothorax asymmetrical, left side pointed, right side lobate. - Genital segment with 2 protrusions dorsally and 1 protrusion ventrally. - 2nd abdominal segment with cuticular elevations ventrally and laterally. - A1 24-segmented, segments 8 and 9 fused; segment 1 through 21 with 1 or more rows of small spines reaching to 4th thoracic segment. - A2 with endopod less than 1/2 of length of exopod. - Basal segment of Md palp with 2 setae; gnathobase elongate and bearing 4 rounded teeth and 2 slender setae-like structures. - Mx1 with exopod bearing 2 sensory and 4 normal setae. Setae on 1st inner lobe very fine and elongate. - Distal end of Mx2 with 3 bulbous and 6 worm-like sensory setae. - Basal segment of Mxp bearing 4 sensory setae. - P1 with 3 exopodal segments each bearing 1 spine; endopod 1-segmented. - Rami of P2-P4 elongate and bearing numerous small spines on anterior and postarior surfaces as well as on basal segments. 1st basal segment of P4 bearing proximally 1 large spine on right side and 2 smaller spines on left side.
| | | | | Compl. Ref.: | | | Bradford-Grieve, 2004 (p.285) | | | | NZ: | 3 | | |
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Distribution map of Diaixis asymmetrica by geographical zones
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| | | | Loc: | | | NW Atlant. (off S Woods Hole), SE Atlant., W South Africa.
Type locality: 39°45.2' N, 70°33.8' W. | | | | N: | 3 | | | | Lg.: | | | (200) F: 1,22; (881) F: 1,18-1,28; M: 1,22; {F: 1,18-1,28; M: 1,22} | | | | Rem.: | hyperbenthic. (1750-1822 m; 795-920 m).
Grice & Hülsemann (1970, p.193) point out the presence of 2 sensory setae on the exopod of Mx1 that is a distinctive characteristic of this species , and one which the authors have not observed in truly pelagic species.
See remarks in Diaiscolecithrix andeep Markhaseva & al. 2010. | | | Last update : 22/01/2016 | |
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 Any use of this site for a publication will be mentioned with the following reference :
Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2024. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed April 25, 2024] © copyright 2005-2024 Sorbonne University, CNRS
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