Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Aetideidae ( Family )
            Aetideus ( Genus )
Aetideus mexicanus  Park, 1974   (F,M)
Syn.: Aetideus armatus : Park, 1970 (p.475)
Ref.:
Park, 1974 (p.215, figs.F,M); Markhaseva, 1996 (p.21, figs.F,M)
Species Aetideus mexicanus - Plate 1 of morphological figuresIssued from : E.L. Markhaseva in USSR Acad. Sci., Zool. Inst., Explor. Fauna Seas. Marine Plankton, 1989, 41 (49). [p.20, Fig.8].
Female from Park (25°15'N, 81°11'W), 1974, except R and P3 from Markhaseva (13°N, 133°W).


Species Aetideus mexicanus - Plate 2 of morphological figuresIssued from : E.L. Markhaseva in USSR Acad. Sci., Zool. Inst., Explor. Fauna Seas. Marine Plankton, 1989, 41 (49). [p.20, Fig.8].
Male from Park, 1974, except P1 from Markhaseva.


Species Aetideus mexicanus - Plate 3 of morphological figuresAetideus mexicanus female:
1 - Posterior corners of last thoracic segment prolonged into points.
2 - Posterior corners not prolonged into wing-like lobes: points not reaching the middle of urosomal degment 2. Anterior part of cephalon without crest.
3 - Basipodite of right P1 with an external tooth-like projection distally. Coxopodite of P4 without spinules near the base of internal seta.
4 - Posterior corners of last thoracic segment not divergent, usually not exceeding posterior border of genital segment. Rostral excavation 1.07-1.16 times as wide as deep.


Species Aetideus mexicanus - Plate 4 of morphological figuresAetideus mexicanus male:
1 - Posterior corners of last thoracic segment with points.
2 - Points not eceeding posterior border of urosomal segment 2 (in dorsal view).
3 - 2nd segment of P5 3.34-4.2 times as long as wide.
4 - Endopodite of P2 not exceeding border between exopodal segments 2 and 3. External spine at exopodal segment 2 of P1 not exceeding the middle of exopodal segment 1.


Species Aetideus mexicanus - Plate 5 of morphological figuresIssued from : T. Park in Fish. Bull., 1974, 72 (1). [p.216, Fig.1].
Female (from 25°15'N, 89°11'W): A-B, habitus (dorsal and lateral, respectively); C, posterior part of body (lateral); D, forehead (lateral); E, posterior part of body (dorsal); F, last metasomal and first two urosomel segments (lateral; another specimen); G, rostrum (anterior); H, urosome (dorsal); I-L, P1 to P4 (anterior views).


Species Aetideus mexicanus - Plate 6 of morphological figuresIssued from : T. Park in Fish. Bull., 1974, 72 (1). [p.216, Fig.1].
Male: A-B, habitus (dorsal and lateral, respectively); C, forehead (lateral); D-E, posterior part of body (lateral and lateral, respectively); F, A1 (setae omitted); G, 19th segment of A1; H, A2; I, Md; J, Mx1; K, Mxp; L-N, P1 to P3 (anterior views); O, P5 (anterior).
L and W: length and width segment.

Compl. Ref.:
Suarez-Morales & Gasca, 1998 a (p107)
NZ: 3

Distribution map of Aetideus mexicanus by geographical zones
Loc:
Gulf of Mexico, S China Sea
N: 2
Lg.:
(206) F: 1,84-1,66; M: 1,68-1,58; {F: 1,66-1,84; M: 1,58-1,68}
Rem.: mesopelagic.
Species close to A. divergens; Male similar to that of A. armatus.
For Park (1974, p.217) the female is distinguished from A. armatus by long A1 which extend beyond the caudal rami by 2 segments and, particularly, P4 which lack spinules at the base of the coxal seta. The male is very close to that of A. armatus as described by Bradford but seems to differ from it in the proportions of the caudal rami and the 2nd to 4th segments of P5.. However, the importance of these characters in the distibction between the two species is yet to be determined.
Last update : 26/12/2017
    to add or edit your remark
  
By Mariluz Fernandez de Puelles 2017-11-17 10:58:23    ( Citation of this remark )
It was found at geographical position of long:-115.7725;lat:13.7653 a female of Aetideus mexicanus (1.8 mm) during the Malaspina expedition at 2000-3000 m depth.

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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 25, 2021]

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