The monotypic brazilian genus Diacrodon is a synonym of Borreria (Spermacoceae, Rubiaceae) : morphological and molecular evidences

Diacrodon is a monotypic genus of the tribe Spermacoceae (Rubiaceae), endemic to northeastern Brazil. Diacrodon compressus is frequently misidentified with a two lobed calyx species of Borreria, B. verticillata. Traditionally, in Spermacoceae the fruit type was considered a diagnostic character amon...

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Autores principales: Miguel, Laila Mabel, Sobrado, Sandra Virginia, Janssens, Steven, Dessein, Steven, Cabral, Elsa Leonor
Formato: Artículo
Lenguaje:Español
Publicado: Academia Brasileira de Ciencias 2025
Materias:
Flower
Fruit
ITS-ETS dataset
Morphology
Pollen
Seed
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/56802
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
id I48-R184-123456789-56802
record_format dspace
spelling I48-R184-123456789-568022025-05-20T12:11:50Z The monotypic brazilian genus Diacrodon is a synonym of Borreria (Spermacoceae, Rubiaceae) : morphological and molecular evidences Miguel, Laila Mabel Sobrado, Sandra Virginia Janssens, Steven Dessein, Steven Cabral, Elsa Leonor Flower Fruit ITS-ETS dataset Morphology Pollen Seed Diacrodon is a monotypic genus of the tribe Spermacoceae (Rubiaceae), endemic to northeastern Brazil. Diacrodon compressus is frequently misidentified with a two lobed calyx species of Borreria, B. verticillata. Traditionally, in Spermacoceae the fruit type was considered a diagnostic character among the genera. In this sense, D. compressus presents a strongly compressed, one seeded and indehiscent fruit (vs. globose, two seeded and dehiscent fruit in B. verticillata). In this work, we address two objectives: evaluate the systematic position and determine the identity of Diacrodon in respect to other taxa. Molecular analyses using ITS and ETS indicate that D. compressus is strongly related to other species of Borreria. The morphological results revealed that D. compressus, despite of its type of fruit, is identical to Borreria in floral and palynological features. As conclusion, the new combination Borreria diacrodonta is made and a lectotype is designated. An updated description of the species and a key to the Borreria species with a two lobed calyx are provided. The distribution of B. diacrodonta is extended to Brazilian states Goiás and Minas Gerais, and Paraguay. By this taxonomical change it has become clear that the dehiscence of the fruits lack taxonomic value in the delimitation of Borreria. 2025-05-20T12:00:33Z 2025-05-20T12:00:33Z 2018-06-01 Artículo Miguel, Laila Mabel, et al., 2018. The monotypic brazilian genus Diacrodon is a synonym of Borreria (Spermacoceae, Rubiaceae) : morphological and molecular evidences. Anais da Academia Brasileira de Ciencias. Río de Janeiro: Academia Brasileira de Ciencias, vol. 90, no. 2, p. 1397-1415. E-ISSN 1678-2690. DOI http://dx.doi.org/10.1590/0001-3765201820170314 0001-3765 http://repositorio.unne.edu.ar/handle/123456789/56802 spa http://dx.doi.org/10.1590/0001-3765201820170314 openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf p. 1397-1415 application/pdf Academia Brasileira de Ciencias Anais da Academia Brasileira de Ciencias, 2018, vol. 90, no. 2, p. 1397-1415.
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 Español
topic Flower
Fruit
ITS-ETS dataset
Morphology
Pollen
Seed
spellingShingle Flower
Fruit
ITS-ETS dataset
Morphology
Pollen
Seed
Miguel, Laila Mabel
Sobrado, Sandra Virginia
Janssens, Steven
Dessein, Steven
Cabral, Elsa Leonor
The monotypic brazilian genus Diacrodon is a synonym of Borreria (Spermacoceae, Rubiaceae) : morphological and molecular evidences
topic_facet Flower
Fruit
ITS-ETS dataset
Morphology
Pollen
Seed
description Diacrodon is a monotypic genus of the tribe Spermacoceae (Rubiaceae), endemic to northeastern Brazil. Diacrodon compressus is frequently misidentified with a two lobed calyx species of Borreria, B. verticillata. Traditionally, in Spermacoceae the fruit type was considered a diagnostic character among the genera. In this sense, D. compressus presents a strongly compressed, one seeded and indehiscent fruit (vs. globose, two seeded and dehiscent fruit in B. verticillata). In this work, we address two objectives: evaluate the systematic position and determine the identity of Diacrodon in respect to other taxa. Molecular analyses using ITS and ETS indicate that D. compressus is strongly related to other species of Borreria. The morphological results revealed that D. compressus, despite of its type of fruit, is identical to Borreria in floral and palynological features. As conclusion, the new combination Borreria diacrodonta is made and a lectotype is designated. An updated description of the species and a key to the Borreria species with a two lobed calyx are provided. The distribution of B. diacrodonta is extended to Brazilian states Goiás and Minas Gerais, and Paraguay. By this taxonomical change it has become clear that the dehiscence of the fruits lack taxonomic value in the delimitation of Borreria.
format Artículo
author Miguel, Laila Mabel
Sobrado, Sandra Virginia
Janssens, Steven
Dessein, Steven
Cabral, Elsa Leonor
author_facet Miguel, Laila Mabel
Sobrado, Sandra Virginia
Janssens, Steven
Dessein, Steven
Cabral, Elsa Leonor
author_sort Miguel, Laila Mabel
title The monotypic brazilian genus Diacrodon is a synonym of Borreria (Spermacoceae, Rubiaceae) : morphological and molecular evidences
title_short The monotypic brazilian genus Diacrodon is a synonym of Borreria (Spermacoceae, Rubiaceae) : morphological and molecular evidences
title_full The monotypic brazilian genus Diacrodon is a synonym of Borreria (Spermacoceae, Rubiaceae) : morphological and molecular evidences
title_fullStr The monotypic brazilian genus Diacrodon is a synonym of Borreria (Spermacoceae, Rubiaceae) : morphological and molecular evidences
title_full_unstemmed The monotypic brazilian genus Diacrodon is a synonym of Borreria (Spermacoceae, Rubiaceae) : morphological and molecular evidences
title_sort monotypic brazilian genus diacrodon is a synonym of borreria (spermacoceae, rubiaceae) : morphological and molecular evidences
publisher Academia Brasileira de Ciencias
publishDate 2025
url http://repositorio.unne.edu.ar/handle/123456789/56802
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