Phylogenetic analyses and morphological characteristics support the description of a second species of Tridimeris (Annonaceae)

By

Ortiz, Andres
Escobar, Marcos
Perez, Miguel Angel

Type

Article

Date of Publication

2016

Original Publication

PhytoKeys

Volume

74

Pages

79-96

Subjects

Dimery , Miliuseae , Neotropical , tropical rainforest

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers [2010]-

Identifiers

DOI: https://doi.org/10.3897/phytokeys.74.10371

 

Abstract

Based on phylogenetic and morphological evidence, Tridimeris chiapensis Escobar-Castellanos & Ortiz-Rodr., sp. n. (Annonaceae), a new species from the karst forest of southern Mexico, is described and illustrated. The new species differs from Tridimeris hahniana, the only described species in the genus, in that the latter has flowers with sepals densely tomentose outside, one (rarely two) carpel(s) per flower and fruits densely covered with golden-brown hairs, while Tridimeris chiapensis has flowers with glabrous sepals outside, two to five carpels per flower and glabrous fruits. Furthermore, a shallow triangular white patch at the base of the inner petals is found in T. chiapensis, a morphological character shared with the sister genus Sapranthus but absent in T. hahniana. Geographically, both species occur allopatrically. With just one known locality and seven individuals of Tridimeris chiapensis recorded in one sampling hectare, and based on application of the criteria established by the IUCN, we conclude tentatively that the species is critically endangered.