Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Aetideidae ( Family )
            Chiridiella ( Genus )
Chiridiella subaequalis  Grice & Hulsemann, 1965   (F)
Grice & Hulsemann, 1965 (p.223, 231, Descr.F, figs.F); Markhaseva, 1996 (p.108, figs.F, Rem.); Vives & Shmeleva, 2007 (p.558, Rem.F)
Species Chiridiella subaequalis - Plate 1 of morphological figuresissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.109, Fig.82].
Female. (specimen of Kuril Trench). P.md: mandibular palp.

Nota: Despite minor differences in setation of Mxp, and length of 1st outer spine on exopod of P1 this form is attribuated to C. subaequalis

Species Chiridiella subaequalis - Plate 2 of morphological figuresissued from : G.D. Grice & K. Hulsemann in J. Zool., 1965, 146. [p.234, Fig.10].
Female (29°57'N, 22°58'W): a, habitus (lateral right side); b, A2; c, Md; d, Mx1 (spines on 1st lobe omitted); e, Mx2; f, distal end of Mxp; g, proximal segment of Mxp; h, P1; i, P2; j, detail of tooth structure on terminal spine of P2; k, P3; l, P4.
Nota: Head and 1st thoracic segment separate, 4th and 5th fused.
A1 reaches end of prosome.
Endopod and exopod o fA2 subequal
Mx1: 2nd and 3rd inner lobes with 1 and 4 setae, respectively; endopod with 7 setae; exopod with 4 setae.
Mx2 with distal 3 lobes each bearing a heavily thickened seta, all of equal length.
Mxp with elongate setae on endopodal segments.
Exopods of P2-P4 3-segmented with 1st and 2nd segments incompletely separated.

Species Chiridiella subaequalis - Plate 3 of morphological figuresChiridiella subaequalis female:
1 - Mx2 with 5 endites.
2 - Mx2 not strongly modified in comparison with typical; setation first-fifth endites nearly of the same size, without pincers-like spines.
3 - Endopod of P1 without external lobe.
4 - Exopod of P1 with 2 external spines.
Mx1 second and third internal lobes with 1 and 4 setae respectively; endopod with 7 setae; exopod with 4 setae.

Species Chiridiella subaequalis - Plate 4 of morphological figuresissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.109, Fig.82].
Female: Mx1 and Mx2.

Species Chiridiella subaequalis - Plate 5 of morphological figuresChiridiella subaequalis female ;
1 - Mx2 lobes without spines arranged as pincers.
2 - 3rd, 4th and 5th lobes of Mx2 with enlarged hooklike spines .
3 - A1 approximately cephalothorax length.
4 - Endopods of P1-P4 1-segmented.
5 - Exopod of P1 with 2 edge spines.

Compl. Ref.:
Hopkins & Torres, 1988 (tab.1); Markhaseva & Razzhivin, 1993 ( p.611); Razouls & al., 2000 (p.343, Appendix); Park & Ferrari, 2009 (p.143, Table 4, Appendix 1, biogeography)
NZ: 3

Distribution map of Chiridiella subaequalis by geographical zones
Species Chiridiella subaequalis - Distribution map 3
Chart of 1996
off W Canary Is. , Antarct. (Weddell Sea, Indian sector), Kuril-Kamchatka (in Markhaseva & Razzhivin, 1993).

Type locality: 29°57'N, 22°53'W.
N: 3
(37) F: 3-2,81; (226) F: 2,81; {F: 2,81-3,00}
Rem.: bathy & abyssopelagic (3000-4000 m; 1500-2000 m).
Sampling depth (Antarct.) : 600-1000 m.
This species is related to C. brachydactyla Sars (1907), C. kuniae Deevey, 1974 and C. bispinosa Park (1970).
Last update : 26/07/2018
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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., 2005-2023. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed January 31, 2023]

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