Morphological phylogenetic analysis confirms the monophyly of Rhysophora Cresson (Diptera: Ephydridae) and provides a framework for a revision of the genus
Daniel N. R. Costa A D , Wayne N. Mathis B and Luciane Marinoni CA Departamento de Zoologia, Universidade Federal do Paraná, Jardim das Américas, 81531-980 – Curitiba, Paraná, Brazil.
B Department of Entomology, PO Box 37012, MRC 169; Smithsonian Institution, Washington, DC 20013-7012, USA.
C Fellowship of Departamento de Zoologia, Universidade Federal do Paraná, Jardim das Américas, 81531-980 – Curitiba, Paraná, Brazil.
D Corresponding author. Email: negosekidan@ufpr.br
Invertebrate Systematics 29(1) 71-103 https://doi.org/10.1071/IS14028
Submitted: 9 June 2014 Accepted: 16 September 2014 Published: 20 March 2015
Abstract
With discovery of four new Neotropical species, the New World shore-fly genus Rhysophora Cresson, 1924 is revised, including a phylogenetic reassessment of some generic relationships within Discomyzini and of species within Rhysophora. The reconstructed phylogenetic relationships are based on 43 adult morphological characters and resulted in the following discoveries, mostly based on the well-supported cladogram: (1) the monophyly of Rhysophora is corroborated; (2) its sister group is Helaeomyia Cresson, not Guttipsilopa Wirth, as previously proposed; (3) three species groups within Rhysophora are recognized; and (4) greater species diversity is in South America, where there is also greater diversity in host plants. We hypothesise that the two Nearctic species, R. robusta and R. laffooni, resulted from two independent dispersal and speciation events when their water lettuce and pickerel weed hosts also dispersed there from the Neotropics. All of these flies are associated with aquatic plants of the families Pontederiaceae (Pontederia, Eichhornia) and Araceae (Pistia stratiotes), with the exception of R. griseola. All species are redescribed and an identification key, distribution maps and illustrations of male terminalia are provided to assist identification of these species.
Additional keywords: cladistic analysis, Eichhornia, Pistia stratiotes, Pontederia, shore flies, taxonomy.
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