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Master's Dissertation
DOI
10.11606/D.59.2011.tde-08062011-110010
Document
Author
Full name
Lucas de Araujo Cezar
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Ribeirão Preto, 2011
Supervisor
Committee
Lamas, Carlos José Einicker (President)
Amorim, Dalton de Souza
Nihei, Silvio Shigueo
Title in Portuguese
Revisão taxonômica e análise cladística de Oidardis Hermann (Diptera: Asilidae: Laphriinae: Atomosiini)
Keywords in Portuguese
Asilidae
Diptera
Sistematica
Taxonomia
Abstract in Portuguese
Oidardis e um genero neotropical de pequenas moscas predadoras, distribuido em areas florestais da Costa Rica a Argentina. Ele inclui, ate agora: O. aenescens, O. aveledoi, O. curopaoensis, O. gibba, O. gibbosa, O. nigra, O. triangularis. Este estudo teve como objetivos: redescrever todas as especies conhecidas de Oidardis; descrever novas especies; elaborar uma chave de identificacao para todas as especies do genero; testar a monofilia de Oidardis; testar a validade das sinonimias assumido pelos autores antigos e recuperar as relacoes filogeneticas entre especies conhecidas de Oidardis. Um total de seis especies foram redescritas e ilustradas seis especies novas descritas e ilustradas. O. nigra e proposto como um novo sinonimo de O. triangularis.A analise de parcimonia foi realizada com 14 taxons internos (seis especies validas; seis especies ainda nao descritas; Eumecosoma tarsalis e E. shropshirei), quatro taxons como grupos externos (Ommatius orenoquensis Bigot, Perasis sp., Dissmeryngodes sp. e Strombocodia sp.). Considerou 79 caracteres morfologicos, incluindo de genitalia masculina. O material examinado foi obtido a partir de importantes museus e colecoes do mundo. A analise retornou uma hipotese mais parcimoniosa (L = 299, CI = 0,38, Ri = 0,42). A monofilia de Oidardis foi recuperada, com base na suave curvatura da margem lateral do olho, entre outras apomorfias. Os resultados preliminares mostram Eumecosoma como parafiletico em relacao a Oidardis, mas uma melhor amostragem do grupo e necessaria, antes de quaisquer mudancas nomenclaturais sejam realizadas. As sinoni mias previamente propostas no genero aparentemente estao corretas, com base na reconstrucao filogenetica. Dentro de Oidardis, alguns grupos bem apoiados foram recuperados com destaque para: O. sp. n. 6 como grupo- irmao de O. sp.n.2, devido a sua morfologia distinta de gibosidade facial e cerdas do mystax. Sua estreita relacao com O. aenescens, com base nas cerdas escutelares marginais muito curtas, alem de outros caracteres.As duas especies venezuelanas O. aveledoi e O. curopaoensis recuperadas como especies-irmas. O. sp. n. 1 e sp O.. n. 4 formou um grupo devido ao seu padrao de coloracao do torax semelhante. Cor, em geral, foi um atributo muito importante para a hipotese como um todo. Uma analise desconsiderando esses caracteres retornou uma hipotese pouco informativa para o genero, mantendo-se basicamente o grupo (O. sp. n. 6, O. sp. n. 2).
Title in English
Taxonomy and cladistic analysis of Oidardis Hermann, 1912 (Diptera: Asilidae: Laphriinae: Atomosiini)
Keywords in English
Asilidae
Diptera
Systematics
Taxonomy
Abstract in English
Oidardis is a neotropical genus of small robber flies, distributed in forest areas from Costa Rica to Argentina. It included, so far: O. gibbosa, O. aenescens, O. triangularis, O. gibba, O. nigra, O. aveledoi and O. curopaoensis. In this study, we attempted to: redescribe all known species of Oidardis, describe new species and elaborate an identification key for all the species of the genus; test the monophyly of Oidardis; test the validity of the synonymies assumed by former authors; and recover the phylogenetic relationship between known species of Oidardis. A total of six species were redescribed and illustrated and six new species described and illustrated. O. nigra is proposed as a new synonim for O. triangularis. A parsimony analysis was performed with 14 ingroup taxa (six valid species; six undescribed species; Eumecosoma tarsalis and E. shropshirei), four outgroup taxa (Ommatius orenoquensis Bigot, Perasis sp., Dissmeryngodes sp. and Strombocodia sp.) and 79 morphological characters, including male genitalia. Examined material was obtained from museums and collections worldwide. The analysis returned one most parsimonious hypothesis (L=299, Ci=0,38, Ri=0,42). Monophyly of Oidardis was recovered, based on lateral eye margin smoothly curved, in lateral view and other apomorphies. Preliminary results shows Eumecosoma as being paraphyletic in relation to Oidardis, but a better sampling of it is necessary before any nomenclatural changes are made. Synonimies proposed by former authors seem to be accurate. Within Oidardis, some well supported groups were recovered with remarks to: O. sp. n. 6 as sister-group of O. sp. n. 2, due to their distinct morphology of facial swelling and macrosetae of the mystax. Their close relation to O. aenescens, based on the very short marginal scutellar setae, plus other characters. The two Venezuelan species O. aveledoi and O. curopaoensis, recovered as sister-taxa. O. sp. n. 1 and O. sp. n. 4 formed a group due to their similar color pattern of the thorax. Color, in general, was a very important attribute to the whole hypothesis. An analysis disconsidering these characters returned an unresolved hypothesis for the genus, retaining basically the (O. sp. n. 6, O. sp. n. 2) group.
 
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Cezar2011.pdf (4.05 Mbytes)
Publishing Date
2012-01-17
 
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