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Morphological description of the first post-embryonic stages (Zoea) of the snapping shrimp Alpheus cf. packardii, Kingsley 1880

Grant number: 21/13318-5
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): December 01, 2021
Effective date (End): November 30, 2022
Field of knowledge:Biological Sciences - Zoology - Morphology of Recent Groups
Principal researcher:Rogério Caetano da Costa
Grantee:Nádia de Moraes Sanches
Home Institution: Faculdade de Ciências (FC). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil
Associated research grant:18/13685-5 - Integrative analysis of the Brazilian fauna of decapod crustaceans: taxonomy, phylogenetic systematics, spermiotaxonomy, morphology of post-embryonic development, ecology and conservation, AP.BTA.TEM


Shrimps of the genus Alpheus are considered the most representative in the number of species of the Alpheidae family. Although shrimp larvae of the Alpheidae family correspond to one of the most significant portions of coastal meroplanktonic communities, the larval description in this family is poorly known. Considering the importance of studies on the morphology of the first larval stages for the taxonomy and phylogeny of decapod crustaceans, the main objective of this study was to describe the morphology of the first larval stages (Zoea) of Alpheus cf. packardii. An ovigerous female was collected in the Ubatuba bay, São Paulo, living in microhabitats (Schizoporella sp.), placed in a plastic bag with saltwater, and taken to the laboratory where it was kept under controlled conditions of temperature and salinity until the larvae hatch. Larvae were fixed in glycerin alcohol. The appendices will be dissected in a ZeissStemi 2000C trinocular stereo microscope, and measurements and illustrations under a Leica DM750 microscope equipped with a clear camera. The total length (CT) and carapace length (CC) will be measured. All illustrations and measurements will be based on 10 different copies. Considering the importance of identifying larval forms in the natural environment, the morphological descriptions resulting from this study, added to those already published and new larval descriptions of Alpheus species present on the Brazilian coast will be fundamental for a future formulation of a larval identification key at the level of species, thus allowing the identification of larvae in meroplankton, being the first step to enable studies on larval ecology with an emphasis on migratory and dispersal processes of species, in addition to the identification of spawning sites and development of species, aspects considered fundamental in the life history of these organisms.(AU)

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