Species Card of Copepod
Calanoida ( Order )
    Ryocalanoidea ( Superfamily )
        Ryocalanidae ( Family )
            Yrocalanus ( Genus )
Yrocalanus kurilensis  Renz, Markhaseva & Laakmann, 2018   (F,M)
Ref.:
Renz & al., 2018 (p.19, Descr.F, M, figs.F, M, molecular phylogeny)
Species Yrocalanus kurilensis - Plate 1 of morphological figuresIssued from : J. Renz, E.L. Markhaseva & S. Laakmann in Zool. J. Linnean Soc., 2018, XX. [p.20, Fig.11]
Female (from 43.2333°N, 153.9666°E): A-B, habitus (dorsal and lateral, respectively); C, rostrum (ventral view); D-E, urosome (ventral and lateral, respectively); F, A1 (blacked out setae represent a different kind of short setae present on several segments).
Scale bars: A-B, F: 0.5 mm; C-R: 0.1 mm.

Nota:
- Prosome 4.6 times as long as urosole.
- Rostrum 2-pointed.
- Cephalosome and pediger 1 partly fused, pedigers 4-5 separate.
In lateral view, posterolateral corners of prosome extended posteriorly into points, reaching distal margin of the genital double-somite.
- Urosome 4-segmented.
- Genital double somite symmetrical, with short spinules distolaterally on right side and ventromedial genital opening; in lateral view seminal receptacles elongated, turned upward.
- Dorsal posterior margins of genital double somite to 3rd urosomal somite each with row of spinules.
- Caudal rami symmetrical, with row of spinules on inner margin and with 2 lateral setae (II and III), 3 terminal setae (IV-VI) and 1 dorsal seta (VII).
- A1 24-segmented, extending to distal border of pediger 2.


Species Yrocalanus kurilensis - Plate 2 of morphological figuresIssued from : J. Renz, E.L. Markhaseva & S. Laakmann in Zool. J. Linnean Soc., 2018, XX. [p.21, Fig.12]
Female: A, A2; B-C, Md (with gnathobase figured separately in different positions); D, Mx1; E, Mx2.
Scale bars: A-E: 0.1 mm.

Nota:
- A2: coxa with 1, basis with 2 setae; endopod segment 1 - Md: gnathobase curribg edge with 8 unequal teeth plus ventral seta; basis with 3 setae; exopodal segments incompletely fused, with 6 setae; 1st endopodal segment with 2 setae, 2nd with 10 setae.
- Mx1: praecoxal arthrite with 9 terminal spines, 4 posterior and 1 anterior satae; posterior and anterior surface of praecoxal arthrite with small spinules; coxal endite with 6 setae, coxal epipodite with 8 setae; proximal basal endite with 4 setae, distal basal endite with 5 setae; endopod with 14 setae; exopod with 11 setae.
- Mx2: proximal praecoxal endite bearing 3 setae plus attenuation in holotype, 4 setae plus attenuation in paratype, distal praecoxal endite with 3 setae; coxal endites with 3 setae each; coxa with 1 outer seta; proximal basal endite with 3 setae; remaining endopod with 8 setae. All endites except for praecoxal endite with surface spinules.


Species Yrocalanus kurilensis - Plate 3 of morphological figuresIssued from : J. Renz, E.L. Markhaseva & S. Laakmann in Zool. J. Linnean Soc., 2018, XX. [p.22, Fig.13]
Female: A, Mxp; B, P1 (with endopod figured separately); C, P2; D, P3 (with endopod figured separately); E, P4 (with endopod figured separately).
Scales bars: A-E: 0.1 mm.

Nota: Mxp: syncoxa with 1 seta on proximal praecoxal endite, 2 setae on middle endite, and 3 setae on distal praecoxal endite; coxal endite with 3 setae; syncoxa with row of spinules. Basis with 3 distal setae; endopod with 2, 4, 4, 3, 3 + 1, and 4 setae and rowo of spinules at setae basis on segment 3 and 4.


Species Yrocalanus kurilensis - Plate 4 of morphological figuresIssued from : J. Renz, E.L. Markhaseva & S. Laakmann in Zool. J. Linnean Soc., 2018, XX. [p.24, Table 5]
Female & Male: Seta and spine formula from:the Kurile-Kamchatka Trench.


Species Yrocalanus kurilensis - Plate 5 of morphological figuresIssued from : J. Renz, E.L. Markhaseva & S. Laakmann in Zool. J. Linnean Soc., 2018, XX. [p.23, Fig.14]
Male (from 46.2333°N, 155.5333°E): A, prosome (dorsal); B, habitus (lateral); C, rostrum (ventral view); D, urosome (dorsal); E, left A1; F, right A1 (segments I-XIX); G, right A1 (segments XX-XXVIII); H, P5.
Scale bars: A-B: 0.2 mm; C-H: 0.1 mm.

Nota:
- Rostrum 2-pointed.
- Cephalosome and pediger 1 almost completely fused, pedigers 4 and 5 separate.
- In lateral view, posterolateral corners of prosome extended posteriorly into points, slightly extending urosomite 1.
- Caudal tami symmetrical, with 2 lateral setae (II and III), 3 terminal setae (IV-VI) and 1 dorsal seta (VII).
- Lefy A1 unmodified, 24-segmented, extending to urosome. Right A1 strongly modified for grasping, 24-segme,nted; segments XX-XXVI strongly enlarged; segment XX with 1 distal strong hook-like attenuation; segment XXI with a straight, strong, spine-like attenuation and a serrated strong spine; segments XXIII-XXIV with a large plate; segment XXI with lateral lamella; hinges occurring between segments XVIII and XIX, XIX and XX, XX and XXI, and XXII and XXIII.
- A2 as in female, except endopod segment 2 with 16 setae/
Md similar to that of female, except basis with 2 setae.
- Mx1 as in female, but exopod with 10 setae.
- Mx2 similar to that of female, but proximal praecoxal endite bearing 3 setae.
- Mxp as in female.
- P5 uniramous on both sides. Right leg 2-segmented, with small terminal spine, shorter than left leg. Left leg with exopod 3-segmented; segment 2 with row of spinules distally, segment 3 with medial row of spinules.

NZ: 1

Distribution map of Yrocalanus kurilensis by geographical zones
Loc:
NW Pacif. (Kurrile-Kamchatka)

Type locality: 43.5666° N, 153.9666° E.
N: 1
Lg.:
(1223) F: 1,75; M: 1,53-1,58
Rem.: Hyperbenthic (above the sea bed at depth: 5376 m)
Last update : 30/03/2019
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2022. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed August 09, 2022]

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