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Issue: Vol. 4995 No. 3: 1 Jul. 2021
Type: Article
Published: 2021-07-01
DOI: 10.11646/zootaxa.4995.3.13
Page range: 594-600
Abstract views: 556
PDF downloaded: 35

Morphological variations of Phrosina semilunata Risso, 1822 juveniles (Crustacea: Amphipoda: Hyperiidea), new evidence from the Gulf of Mexico

Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Av. Ciudad Universitaria 3000, C.P. 04510, Coyoacán, Mexico City, Mexico.
Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Circuito exterior S/N, Ciudad Universitaria, C.P. 04510, Coyoacán, Mexico City, Mexico.
Facultad de Ciencias, Universidad Nacional Autónoma de México, Av. Ciudad Universitaria 3000, Circuito exterior S/N, C.P. 04510, Coyoacán, Mexico City, Mexico.
Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Av. Ciudad Universitaria 3000, C.P. 04510, Coyoacán, Mexico City, Mexico.
Crustacea Amphipoda Hyperiidea Phrosinidae Phrosina semilunata juvenile characters

Abstract

Lack of knowledge of morphological variations during growth of amphipod crustaceans can result in misidentification of species. In this study, we advance the knowledge of morphological variations of juveniles of the monotypic genus Phrosina Risso, 1822 collected in the oceanic province of the southern Gulf of Mexico. The juveniles differed from the adults mainly in the morphology of pereopods 3 & 4 in that the carpal process is parallel to the propodus, also the rami of the pleopoda consist of only four segments, uropoda 3 are more lanceolate, and the uropoda bear a large prominent spine terminally. These morphological variations have not been described for the species previously. Therefore, the current observations enrich the description of P. semilunata in the early stages of growth and support the need for further taxonomical studiest that could help identify species at different stages of development.

 

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