Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Aetideidae ( Family )
            Pseudeuchaeta ( Genus )
Pseudeuchaeta vulgaris  Markhaseva, Mohrbeck & Renz, 2017   (F)
Ref.:
Markhaseva & al., 2017 (p.291, Descr. F, figs.F, Rem.)
Species Pseudeuchaeta vulgaris - Plate 1 of morphological figuresIssued from : E.L. Markhaseva, I. Mohrbeck & J. Renz in Mar. Biodv., 2017, 47. [p.290, Fig.1].
Female (from 11°49.8'N, 117°00.4W): a-b, habitus (dorsal and lateral, respectively); c, cephalosome (dorsal anterior); d-e, rostrum (lateral view); f, rostrum (ventral view); g, caudal rami ( (dorsal).
Scale bars: 1.0 mm (a-e); 0.5 mm (f-g).

Nota:
- Rostrum as rounded plate.
- Cephalosome and 1st pedigerous somite incpmpletely fused, 4th and 5th pedigerous somires incompletely fused.
- Posterior corners pointed directed dorsally, slightly diverging or not.
Urosome 4-segmented.
- Genital double-somite symmetrical.
- Caudal rami slightly longer than wide; 1lateral seta (II), 1 ventral seta (VII), and 4 terminal setae (III-VI).


Species Pseudeuchaeta vulgaris - Plate 2 of morphological figuresIssued from : E.L. Markhaseva, I. Mohrbeck & J. Renz in Mar. Biodv., 2017, 47. [p.291, Fig.2].
Female: a, urosome (dorsal); b-c, same (left and right lateral); d, f, h, posterior prosome and genital double-somite (lateral); e, g, i, posterior prosome and genital double-somite (dorsal); j, k, genital field in lateroventral and ventral view;
Scale bars: 1.0 mm (a-i; 0.5 mm (j-k).

Nota: Spermathecae directed dorsoanteriorly and at varying angles


Species Pseudeuchaeta vulgaris - Plate 3 of morphological figuresIssued from : E.L. Markhaseva, I. Mohrbeck & J. Renz in Mar. Biodv., 2017, 47. [p.292, Fig.3].
Female: a, A1 ancestral segments I-XI, arroxs mark small sensilla; b, A1, ancetral segments I-XVIII; c, A1, ancestral segments XIX- XXVIII; d, A1, ancestrak segments XXVII-XXVIII.
Scale bars: 1.0 mm (a-c); 0.1 mm (d).

Nota: A1 24-segmented, . longer than prosome, reaching (usually) posterior part of genital double-somite.
In some specimens small sensilla are visible on antennule proximal segments I-XI (marked by arrows).


Species Pseudeuchaeta vulgaris - Plate 4 of morphological figuresIssued from : E.L. Markhaseva, I. Mohrbeck & J. Renz in Mar. Biodv., 2017, 47. [p.293, Fig.4].
Female: a, A2; b, A2 exopod; c, Md palp; d, Md gnathobase; e, Md cutting edge; f, Mx1 (setae of proximal basal endite not figured); g-i, Mx1 praecoxal arthrite; h, Mx1proximal basal endite.
Scale bars: 0-.5 mm (a-d, f-i); 0.1 mm (e).

- A2: coxa with 1 seta, basis with 1 seta, exopod incompletely 9 segmented (2nd and 3rd proximal segments partly separate) with 1-1, 1, 1, 1, 1, 1, 1, 0, and 3 setae; 1st endopodal segment without setae, 2nd with 8+6 setae.
- Md: gnathobase cutting edge with 6 teeth, seta and needle-like spinules; basis with 1 seta; exopod 5-segmented with 1, 1, 1, 1, and 2 setae; endopod segment 1 with 1 seta, segment 2 with 5 setae (4 long and 1 additional very short and reduced un some specimens).
- Mx1: praecoxal arthrite with 9 terminal and 3 posterior setae with tiny spinules at bases of inner terminal setaz; coxal endite with 4 setae; proximal basal endite with 2 setae, distal basal endite with 4 setae (in one specimen of additional material, left limb with deviating setation of 5-6 setae); endopod with 15-16 setae; exopod with 11 setae; coxal epipodite with 7 long and 1 short setae (in one specimen of additional material, left limb with deviating setation of 9 setae), its common maxillule setation formula: 9+3, 4, 2, 4, 15-16, 11, 8.


Species Pseudeuchaeta vulgaris - Plate 5 of morphological figuresIssued from : E.L. Markhaseva, I. Mohrbeck & J. Renz in Mar. Biodv., 2017, 47. [p.294, Fig.5].
Female: a, Mx2 (praecoxal, coxal and basal endites); b, Mx2 (endite-like lobe of proximal endopodal segment and endopod; c, Mx2 (endite-like lobe of proximal endopodal segment and proximal segment of endopod; d, Mx2 (3 distal endopod segments); e, Mxp (syncoxa and proximal part of basis); f, Mxp (sensory appendage of coxa); g, Mxp (basis and endopod 'Enp'); h, Mxp (basis distal part, endopod segments 1 and 2, only 2 thick setae of endopod segment 2 figured).
Scale bars : 0.5 mm.

Nota;
- Mx2: all endites and proximal endopodal segment enditic-like lobe with 3 setae; endopod with 6 setae.
- Mxp: praecoxal endites of syncoxa with 1, 2 and 3 setae (from proximal to distal), coxal endite with 3 setae and elongated sensory attenuation; basis with 3 medial setae; endopod 6-segmented with 2, 4, 4, 3, 3+1, and 4 setae (2 setae on each of endopod 2 to 6 segments are significantly smaller and thinner); long detae of endopod segments 2-6 supplied by crescent-like structures typvcal of the genus.


Species Pseudeuchaeta vulgaris - Plate 6 of morphological figuresIssued from : E.L. Markhaseva, I. Mohrbeck & J. Renz in Mar. Biodv., 2017, 47. [p.295, Fig.6].
Female: a, P1; b, P2; c, P3; d, P4.
Scale bars: 0.5 mm.

NZ: 1

Distribution map of Pseudeuchaeta vulgaris by geographical zones
Loc:
N Pacif. (off NW Clipperton Islands

Type locality: 13°49.9' N, 116°34.5' W
N: 1
Lg.:
(1213) F: 7,00-7,60; {F = 7,00-7,60}
Rem.: Abyssal (about 4000-4400 m) samples close to the seabed.
For Markhaseva & al. (2017, p.293) the differential diagnosis of this species from its congeners is: 1- Posterior corners are pointed, directed dorsally and more or less diverging; 2- A1 reaches the middle length of posterior border of genital double-somite; 3- Md endopodal segment 2 with 5 (rarely 4) setae: 4- Mx1 coxal endite with 4 setae; proximal basal endite with 2 setae; distal basal endite with 4 setae; 5- Sensory appendage on coxal endite of Mxp syncoxa shorter than the two distal setae; 6- P1 exopodal segment 1 without lateral spine.
The species name ''vulgaris'' refers to the morphology of the species, which is typical for the genus Pseudeuchaeta.
Last update : 17/01/2018
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2021. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed February 28, 2021]

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