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The present work aims to provide the first description of the reproductive system of this genus using histological, histochemical, and morphological perspectives to elucidate the gonochoric or hermaphrodite sexual system in this genus. Males have a slender and very translucent reproductive system that is challenging to observe. The entire cephalothorax was histologically sectioned to ensure that all regions of the reproductive system could be identified. This non-gambarelloides group shows a gonochoric condition. The caridean pattern of the reproductive system was observed where the male has a pair of testes and a pair of very thin vasa deferentia, ending at the opening of the gonopore. Spermatophore structure is absent, without any layers surrounding the spermatozoa that are aggregated in a sperm mass. In females, the reproductive system consists of a pair of ovaries that extend to the end of the pleon. The extension of the ovary has a particular pattern compared to other caridean shrimps. Here, we hypothesize that males invest energy on somatic morphological structures to protect the host and female, using the larger pistol-like cheliped, while females invest energy in reproduction since all the members of this group are typical \u201cpair-bond\u201d examples. The observed pattern of the reproductive male morphology could also be evidence of a possible synapomorphy for this genus within the infraorder.<\/jats:p>","DOI":"10.1093\/cz\/zoae053","type":"journal-article","created":{"date-parts":[[2024,9,16]],"date-time":"2024-09-16T17:18:01Z","timestamp":1726507081000},"page":"338-352","source":"Crossref","is-referenced-by-count":5,"title":["Functional reproductive morphology of the snapping shrimp genus <i>Synalpheus<\/i> Spence Bate, 1888 (Decapoda, Alpheidae)"],"prefix":"10.1093","volume":"71","author":[{"given":"Isabela R R","family":"Moraes","sequence":"first","affiliation":[{"name":"Laborat\u00f3rio de Biologia de Invertebrados Aqu\u00e1ticos, Bioscience Institute, Biodiversity and Biostatistics Department, S\u00e3o Paulo State University (UNESP) , Campus Botucatu, Professor Antonio Celso Wagner Zanin, 250, 18618-689 S\u00e3o Paulo ,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mariana","family":"Antunes","sequence":"additional","affiliation":[{"name":"Laborat\u00f3rio de Ecologia de Peixes Marinhos LEPMAR, Departamento de Ci\u00eancias Agr\u00e1rias e Biol\u00f3gicas, Universidade Federal do Esp\u00edrito Santo , CEUNES, BR-101, km 60, Litor\u00e2neo, 29932-540 S\u00e3o Mateus, Esp\u00edrito Santo ,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laura S","family":"L\u00f3pez-Greco","sequence":"additional","affiliation":[{"name":"Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Biodiversidad y Biolog\u00eda Experimental, Laboratorio de Biolog\u00eda de la Reproducci\u00f3n, Crecimiento y Nutrici\u00f3n de Crust\u00e1ceos Dec\u00e1podos, Ciudad Universitaria , Buenos Aires ,","place":["Argentina"]},{"name":"CONICET\u2014Universidad de Buenos Aires, Instituto de Biodiversidad y Biolog\u00eda Experimental y Aplicada (IBBEA) , Buenos Aires ,","place":["Argentina"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fernando Jos\u00e9","family":"Zara","sequence":"additional","affiliation":[{"name":"Invertebrate Morphology Laboratory, Department of Biology and Aquaculture Center (CAUNESP), S\u00e3o Paulo State University (UNESP) , 14884-900 Jaboticabal, SP ,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Antonio Le\u00e3o","family":"Castilho","sequence":"additional","affiliation":[{"name":"Laborat\u00f3rio de Biologia de Invertebrados Aqu\u00e1ticos, Bioscience Institute, Biodiversity and Biostatistics Department, S\u00e3o Paulo State University (UNESP) , Campus Botucatu, Professor Antonio Celso Wagner Zanin, 250, 18618-689 S\u00e3o Paulo ,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2024,9,16]]},"reference":[{"issue":"1","key":"2025070500471854900_CIT0001","doi-asserted-by":"crossref","first-page":"132","DOI":"10.1086\/713005","article-title":"Mating system of the snapping shrimp Synalpheus brevicarpus (Caridea, Alpheidae) inhabiting sponges Dysidea sp. 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