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Systematics, phylogeny and biogeography
RESEARCH ARTICLE

Phylogenetics and phylogeography of a long-legged harvestman (Arachnida : Opiliones) in the Brazilian Atlantic Rain Forest reveals poor dispersal, low diversity and extensive mitochondrial introgression

Cibele Bragagnolo A B E , Ricardo Pinto-da-Rocha B , Manuel Antunes Jr B and Ronald M. Clouse C D
+ Author Affiliations
- Author Affiliations

A Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, Rua Prof. Arthur Riedel n° 275, 09972-270, Diadema, SP, Brazil.

B Departamento de Zoologia, Instituto de Biociências, Universidade de São Paulo, Caixa Postal: 11.461, 05422-970, São Paulo, SP, Brazil.

C American Museum of Natural History, Central Park West at 79th St, New York City, NY 10024, USA.

D Department of Bioinformatics and Genomics, University of North Carolina at Charlotte, 9201 University City Blvd, Bioinformatics, Room 224, Charlotte, NC 28223, USA.

E Corresponding author. Email: cbragagnolo@unifesp.br

Invertebrate Systematics 29(4) 386-404 https://doi.org/10.1071/IS15009
Submitted: 11 March 2015  Accepted: 27 May 2015   Published: 28 August 2015

Abstract

We used DNA sequence data to test the morphology-based taxonomy and examine the biogeography of the Brazilian Atlantic Rain Forest genus Promitobates. Most species are well differentiated morphologically, and a previous morphological phylogeny recovered the genus as monophyletic. However, some of these species have overlapping geographical distributions and considerable intraspecific variation, perhaps representing a species complex. Mitochondrial (12S rRNA and COI) and nuclear (ITS2 and 28S) genes were sequenced from 132 specimens collected from 27 localities. The results are consistent with significant mitochondrial introgression among the species P. ornatus, P. hatschbachi, P. lager, P. bellus and P. intermedius (the ‘P. ornatus species complex’), with one specimen identified as a hybrid between P. nigripes and this complex. A phylogeographic study of the complex was conducted using mitochondrial haplotypes. This revealed remarkably poor dispersal among populations, with only one case of a shared haplotype, and very low genetic diversity. The phylogeny showed a clear break between populations on either side of a narrow region of forest, suggesting an important historical event separated these lineages in the genus. The analyses also pointed to population breaks that date back several millions of years or extremely small effective population sizes, depending on the mutation rate.

Additional keywords: Brazilian Atlantic forest, gene tree incongruence, Gonyleptidae, hybridisation, mitochondrial introgression.


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