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We assessed 46\u2010 individuals of golden lancehead and 12 of Alcatrazes lancehead kept in captivity between 2014 and 2020. Follicular development was similar between species, but follicles in Alcatrazes lancehead were smaller than in the golden lanceheads. Female golden lanceheads produced 24 live young, seven stillborn and 73 undeveloped eggs. Parturition of live young occurred between midsummer (February) and early autumn and gestation averaged 8\u2009months. Female Alcatrazes lanceheads produced four live young in midsummer, and one undeveloped egg in early autumn. Males and females of both species have seasonal and biennial reproductive cycles. Sperm storage in both sexes is essential to coordinate male and female cycles. The data obtained with golden lancehead and Alcatrazes lancehead in captivity, demonstrate a degree of conservatism, following data from other <jats:italic>Bothrops<\/jats:italic>.<\/jats:p>","DOI":"10.1111\/ahe.13038","type":"journal-article","created":{"date-parts":[[2024,4,2]],"date-time":"2024-04-02T15:49:57Z","timestamp":1712072997000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Reproductive cycles of two island pitvipers species (Serpentes, Viperidae) determined by ultrasonography and radiography"],"prefix":"10.1111","volume":"53","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7605-8300","authenticated-orcid":false,"given":"Viviane Campos","family":"Garcia","sequence":"first","affiliation":[{"name":"Programa de P\u00f3s\u2010gradua\u00e7\u00e3o em Anatomia dos Animais Dom\u00e9sticos e Silvestres, Departamento de Cirurgia, Faculdade de Medicina Veterin\u00e1ria e Zootecnia Universidade de S\u00e3o Paulo  S\u00e3o Paulo S\u00e3o Paulo Brazil"},{"name":"Laborat\u00f3rio de Ecologia e Evolu\u00e7\u00e3o Instituto Butantan  S\u00e3o Paulo S\u00e3o Paulo Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3928-1183","authenticated-orcid":false,"given":"Selma Maria","family":"Almeida\u2010Santos","sequence":"additional","affiliation":[{"name":"Programa de P\u00f3s\u2010gradua\u00e7\u00e3o em Anatomia dos Animais Dom\u00e9sticos e Silvestres, Departamento de Cirurgia, Faculdade de Medicina Veterin\u00e1ria e Zootecnia Universidade de S\u00e3o Paulo  S\u00e3o Paulo S\u00e3o Paulo Brazil"},{"name":"Laborat\u00f3rio de Ecologia e Evolu\u00e7\u00e3o Instituto Butantan  S\u00e3o Paulo S\u00e3o Paulo Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2024,4,2]]},"reference":[{"key":"e_1_2_8_2_1","first-page":"256","article-title":"Female reproductive cycles of the snakes Arizona elegans and Crotalus viridis","volume":"35","author":"Aldridge R. 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