Aetideus mexicanus - Species Card - Marine Planktonic Copepods

Aetideus mexicanus Park, 1974 (F,M)

Taxonomy

Order Calanoida

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Superfamily Clausocalanoidea

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Family Aetideidae

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Genus Aetideus

details list species for this Genus

Abbreviations or symbols

Synonymy

Aetideus armatus : Park, 1970 (p.475)

References

List of the studied authors

Park, 1974 (p.215, figs.F,M); Markhaseva, 1996 (p.21, figs.F,M)

Figures

Plate 1 Issued 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 figures

Plate 2 Issued 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.

Plate 3 Aetideus 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.

Plate 4 Aetideus 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 figures

Plate 5 Issued 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 figures

Plate 6 Issued 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.

Complementary References

List of the studied authors

Suarez-Morales & Gasca, 1998 a (p107)

Distribution

NZ: 3

Distribution map of Aetideus mexicanus by geographical zones

Distribution map of Aetideus mexicanus for the Zone China Seas, Vietnam

Localisations

Geographical glossary

Gulf of Mexico, S China Sea

Quotations

N: 2

Dimensions (mm)

References of the authors concerning dimensions

(206) F: 1,84-1,66; M: 1,68-1,58; {F: 1,66-1,84; M: 1,58-1,68}

Remarks

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

Contributor Remarks

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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.