Seeing the true colours: three new species of Obama (Platyhelminthes : Continenticola) from remnants of Atlantic forest in southern Brazil based on an integrative approach
Giuly G. Iturralde A C , Heloísa Allgayer B C , Victor H. Valiati B C and Ana M. Leal-Zanchet
A C D
+ Author Affiliations
- Author Affiliations
A Instituto de Pesquisas de Planárias, Universidade do Vale do Rio dos Sinos – UNISINOS, Avenida Unisinos, 950, 93022-000 São Leopoldo, RS, Brazil.
B Laboratório de Genética e Biologia Molecular, Universidade do Vale do Rio dos Sinos – UNISINOS, Avenida Unisinos, 950, 93022-000 São Leopoldo, RS, Brazil.
C Programa de Pós-Graduação em Biologia, Universidade do Vale do Rio dos Sinos – UNISINOS, Avenida Unisinos, 950, 93022-000 São Leopoldo, RS, Brazil.
D Corresponding author. Email: lealzanchet@gmail.com
Invertebrate Systematics 35(3) 312-331 https://doi.org/10.1071/IS20043
Submitted: 27 May 2020 Accepted: 11 November 2020 Published: 24 March 2021
Abstract
The genus Obama Carbayo, Álvarez-Presas, Olivares, Marques, Froehlich & Riutort, 2013 currently comprises 41 species, most of them from Brazilian rainforests. This study describes three new species, viz. Obama autumna sp. nov., Obama leticiae sp. nov. and Obama aureolineata sp. nov., from remnants of Mixed Ombrophilous Forest in southern Brazil, based on an integrative approach and analyses their relationships within the genus. Obama autumna and O. aureolineata show distinctive colour patterns, contrasting yellow and black, which is unusual in species of the genus. The three species can be easily distinguished from their congeners by their external features and a combination of anatomical characteristics, such as the pharyngeal shape, shape and arrangement of the prostatic vesicle and anatomy of the penis papilla. The morphological hypotheses are corroborated by three species delimitation methods (ABGD, PTP and GMYC) and by phylogenetic analysis of the cytochrome c oxidase subunit I gene using maximum likelihood estimation and Bayesian inference. Furthermore, our phylogenetic analyses point out that Obama may be subdivided into three main clades, containing a variable number of well supported groups, the relationships of which remain unresolved. Obama autumna belongs to a distinct clade in relation to O. aureolineata and O. leticiae. Obama aureolineata belongs to one of the well supported groups, having a close relationship with O. apeva. Obama autumna may be more closely related to O. anthropophila and O. decidualis and O. leticiae to O. braunsi. However, the low nodal support does not allow the phylogenetic relationships of these species to be clearly established. We discuss morphological knowledge gaps in Obama, as well as issues regarding analyses based on molecular markers, which should be addressed to clarify relationships within the genus.
urn:lsid:zoobank.org:pub:9EE7316D-F0BE-49EC-BBFD-5687952D6592
Keywords: Tricladida; taxonomy; Araucaria forest; Neotropical Ecozone.
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