External ontogenetic changes of larval structures in elachistocleis bicolor (anura : microhylidae : gastrophryninae)

Although the external larval morphology of many species of Microhylidae has been characterized, ontogenetic studies in the family are scarce and partial. In the present study, we describe the development of the oral funnel, external gills, external nares, operculum, spiracle, and adhesive organs of...

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Autores principales: Abreliano, Fernanda Natalia, Zaracho, Víctor Hugo, Sandoval, María Teresa
Formato: Artículo
Lenguaje:Inglés
Publicado: De Gruyter 2021
Materias:
Anurans
Development
Spiracle
Oral funnel
External gills
Nares
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/28534
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
id I48-R184-123456789-28534
record_format dspace
spelling I48-R184-123456789-285342025-03-06T11:00:44Z External ontogenetic changes of larval structures in elachistocleis bicolor (anura : microhylidae : gastrophryninae) Abreliano, Fernanda Natalia Zaracho, Víctor Hugo Sandoval, María Teresa Anurans Development Spiracle Oral funnel External gills Nares Although the external larval morphology of many species of Microhylidae has been characterized, ontogenetic studies in the family are scarce and partial. In the present study, we describe the development of the oral funnel, external gills, external nares, operculum, spiracle, and adhesive organs of Elachistocleis bicolor with the aim to contribute to future ontogenetic, evolutionary, and phylogenetic studies. The development of E. bicolor is similar to that of other species with free-swimming tadpoles as Microhyla ornata, Dermatonotus muelleri and Uperodon globulosus. The ontogeny of the oral apparatus shows only the early stages of the pattern most common in anurans. After the invagination of the stomodeum, the anterior and posterior labia are defined, but the keratinized structures are not formed. The conical adhesive glands are similar to those of Physalaemus and Dendropsophus tadpoles, but in E. bicolor, these develop in contact with the posterior labium. The external nares remain closed during most of the larval phase. During ontogeny, the external gills are simultaneously covered by a transverse operculum fold, which later advances towards the posteromedial ventral region, forming the spiracle, while in Type IV larvae the operculum folds close from right to left, covering the right gill first. The distinct larval characters of Microhylidae appear between the last embryonic stages and the first larval stages. Therefore, the consideration of these stages can be of great value in future studies of anuran development in phylogenetic and evolutionary contexts. Ontogenetic studies in microhylid tadpoles are fundamental to identify heterochronic processes, to interpret the variability of larval structures, and to establish or reinforce hypotheses about the origin of larval structures. 2021-09-01T17:54:08Z 2021-09-01T17:54:08Z 2015-07 Artículo Abreliano, Fernanda Natalia, Zaracho, Víctor Hugo y Sandoval, María Teresa, 2015. External ontogenetic changes of larval structures in elachistocleis bicolor (anura : microhylidae : gastrophryninae). Biologia. Berlin: De Gruyter, vol. 70, no. 7, p. 958-967. ISSN 0006-3088. 1336-9563 http://repositorio.unne.edu.ar/handle/123456789/28534 eng openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf application/pdf De Gruyter Biologia, 2015, vol. 70, no. 7, p. 958-967.
institution Universidad Nacional del Nordeste
institution_str I-48
repository_str R-184
collection RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE)
language Inglés
topic Anurans
Development
Spiracle
Oral funnel
External gills
Nares
spellingShingle Anurans
Development
Spiracle
Oral funnel
External gills
Nares
Abreliano, Fernanda Natalia
Zaracho, Víctor Hugo
Sandoval, María Teresa
External ontogenetic changes of larval structures in elachistocleis bicolor (anura : microhylidae : gastrophryninae)
topic_facet Anurans
Development
Spiracle
Oral funnel
External gills
Nares
description Although the external larval morphology of many species of Microhylidae has been characterized, ontogenetic studies in the family are scarce and partial. In the present study, we describe the development of the oral funnel, external gills, external nares, operculum, spiracle, and adhesive organs of Elachistocleis bicolor with the aim to contribute to future ontogenetic, evolutionary, and phylogenetic studies. The development of E. bicolor is similar to that of other species with free-swimming tadpoles as Microhyla ornata, Dermatonotus muelleri and Uperodon globulosus. The ontogeny of the oral apparatus shows only the early stages of the pattern most common in anurans. After the invagination of the stomodeum, the anterior and posterior labia are defined, but the keratinized structures are not formed. The conical adhesive glands are similar to those of Physalaemus and Dendropsophus tadpoles, but in E. bicolor, these develop in contact with the posterior labium. The external nares remain closed during most of the larval phase. During ontogeny, the external gills are simultaneously covered by a transverse operculum fold, which later advances towards the posteromedial ventral region, forming the spiracle, while in Type IV larvae the operculum folds close from right to left, covering the right gill first. The distinct larval characters of Microhylidae appear between the last embryonic stages and the first larval stages. Therefore, the consideration of these stages can be of great value in future studies of anuran development in phylogenetic and evolutionary contexts. Ontogenetic studies in microhylid tadpoles are fundamental to identify heterochronic processes, to interpret the variability of larval structures, and to establish or reinforce hypotheses about the origin of larval structures.
format Artículo
author Abreliano, Fernanda Natalia
Zaracho, Víctor Hugo
Sandoval, María Teresa
author_facet Abreliano, Fernanda Natalia
Zaracho, Víctor Hugo
Sandoval, María Teresa
author_sort Abreliano, Fernanda Natalia
title External ontogenetic changes of larval structures in elachistocleis bicolor (anura : microhylidae : gastrophryninae)
title_short External ontogenetic changes of larval structures in elachistocleis bicolor (anura : microhylidae : gastrophryninae)
title_full External ontogenetic changes of larval structures in elachistocleis bicolor (anura : microhylidae : gastrophryninae)
title_fullStr External ontogenetic changes of larval structures in elachistocleis bicolor (anura : microhylidae : gastrophryninae)
title_full_unstemmed External ontogenetic changes of larval structures in elachistocleis bicolor (anura : microhylidae : gastrophryninae)
title_sort external ontogenetic changes of larval structures in elachistocleis bicolor (anura : microhylidae : gastrophryninae)
publisher De Gruyter
publishDate 2021
url http://repositorio.unne.edu.ar/handle/123456789/28534
work_keys_str_mv AT abrelianofernandanatalia externalontogeneticchangesoflarvalstructuresinelachistocleisbicoloranuramicrohylidaegastrophryninae
AT zarachovictorhugo externalontogeneticchangesoflarvalstructuresinelachistocleisbicoloranuramicrohylidaegastrophryninae
AT sandovalmariateresa externalontogeneticchangesoflarvalstructuresinelachistocleisbicoloranuramicrohylidaegastrophryninae
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