title: First zoeal stage of the partner shrimp Periclimenes paivai Chace, with remarks on the genus Periclimenes O.G. Costa (Caridea, Palaemonidae.
abstract: The morphology of the first zoeal stage of Periclimenes paivai Chace is described and illustrated for the first time. Larvae were obtained from three females with embryos, caught in the type locality (Cananéia, São Paulo state, Brazil). The morphological characters are detailed and compared with all previous descriptions of larvae in the genus (P. amethysteus, P. brevicarpalis, P. diversipes, P. pandionis, P. sagittifer and P. soror). The zoeae I of Periclimenes species are very similar, but P. paivai can be separated from the other six species by means of five characteristics: 8 plumose setae on the inner margin of the antennal scale, one spine on the endopod of the maxillule, one cuspidate seta on the basal endite of the maxilulle, one plumose seta on the single coxal endite of the maxilla, and one plumose seta on the endopod of the maxilla. Remarks from a comparative analysis of available descriptions of the genus are furnished.
authors.affiliation: Laboratory of Biology and Ecology of Marine and Freshwater Shrimps (LABCAM), Faculty of Sciences (FC), São Paulo State University (UNESP) Brazil.; Email: pantaleao@ibb.unesp.br.
authors.forename: João A F
authors.initials: JA
authors.lastname: Pantaleão
authors.affiliation: Laboratory of Bioecology and Crustacean Systematics (LBSC), Faculty of Philosophy, Sciences and Letters at Ribeirão Preto (FFCLRP), University of São Paulo (USP), Brazil; Email: mterossi@usp.br.
authors.forename: Mariana
authors.initials: M
authors.lastname: Terossi
authors.affiliation: Laboratory of Biology and Ecology of Marine and Freshwater Shrimps (LABCAM), Faculty of Sciences (FC), São Paulo State University (UNESP) Brazil.; Email: rccosta@fc.unesp.br.
authors.forename: Rogério C
authors.initials: RC
authors.lastname: Costa
authors.affiliation: Laboratory of Bioecology and Crustacean Systematics (LBSC), Faculty of Philosophy, Sciences and Letters at Ribeirão Preto (FFCLRP), University of São Paulo (USP), Brazil; Email: flmantel@usp.br.
authors.forename: Fernando L
authors.initials: FL
authors.lastname: Mantelatto
mesh_terms: D063147:Animal Distribution; D000825:Animal Structures / Q000033:anatomy & histology; D000818:Animals; D001938:Brazil; D017753:Ecosystem; D005260:Female; D008297:Male; D033541:Palaemonidae / Q000033:anatomy & histology / Q000145:classification*