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Master's Dissertation
DOI
https://doi.org/10.11606/D.41.2012.tde-01052013-091427
Document
Author
Full name
Gabriel Biffi
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2012
Supervisor
Committee
Casari, Sonia Aparecida (President)
Costa, Cleide
Vanin, Sergio Antonio
Title in Portuguese
Análise cladística de Chauliognathini LeConte, 1861 (Coleoptera, Cantharidae)
Keywords in Portuguese
Chauliognathinae
Filogenia
Sistemática
Abstract in Portuguese
A tribo Chauliognathini, na atual definicão, é composta por ca. 650 espécies em 14 gêneros: Chauliognathus, Daiphron, Microdaiphron, Malthesis, Psilorhynchus, Belotus, Maronius, Paramaronius, Maroniodes, Lobetus, Pseudolobetus, Macromalthinus, Malthoichthyurus e Malthinocantharis - estes dois últimos considerados incertae sedis. Caracteriza-se, principalmente, pela forte assimetria do abdômen e genitália dos machos, presença de sutura epistomal e ausência de esporões tibiais. Tradicionalmente, a classificação da subfamília Chauliognathinae e suas duas tribos era baseada principalmente no comprimento dos élitros: os gêneros de élitros longos eram agrupados em Chauliognathini, enquanto os de élitros curtos eram posicionados em Ichthyurini. Na atual classificação os gêneros foram redistribuídos e as tribos definidas com base na morfologia dos segmentos genitais e genitálias dos machos. Para testar a monofilia de Chauliognathini e verificar as relações entre seus gêneros foi feita uma análise cladística da tribo com 138 caracteres morfológicos envolvendo 45 espécies representantes de todos os gêneros de Chauliognathini e alguns de Ichthyurini, Silinae e Cantharinae. Foram encontradas 48 árvores igualmente mais parcimoniosas, com 341 passos de transformação. Demonstrou-se que Chauliognathini não é monofilética. Dois clados principais foram encontrados, agrupando os gêneros de acordo com a classificação tradicional de Chauliognathinae. O clado que representa a tribo Ichthyurini surge dentre os gêneros de Chauliognathini de élitros curtos. Os gêneros Chauliognathus, Daiphron, Malthesis, Belotus e Lobetus também são parafiléticos. Malthopterus pertence ao grupo formado pelos gêneros de élitros longos, enquanto Malthinocantharis deve ser excluído de Chauliognathini e posicionado em Silinae
Title in English
Cladistic analysis of Chauliognathini Le Conte, 1861 (Coleoptera, Cantharidae)
Keywords in English
Chauliognathinae
Phylogeny
Systematics
Abstract in English
The tribe Chauliognathini, in its current definition, is composed of approximately 650 species in 14 genera: Chauliognathus, Daiphron, Microdaiphron, Malthesis, Psilorhynchus, Belotus, Maronius, Paramaronius, Maroniodes, Lobetus, Pseudolobetus, Macromalthinus, Malthoichthyurus e Malthinocantharis - the two latter as incertae sedis. They are characterized by the strong asimmetry of the abdomen and male genitalia, presence of an epistomal suture and absence of tibial spurs. Traditionally, the classification of the subfamily Chauliognathinae and its two tribes were based mainly on elytral length: long-elytra genera were grouped in Chauliognathini, while short-elytra genera were classified in Ichthyurini. On present classification, the genera were redistributed and the tribes were defined based on the morphology of male genital segments and genitalia. To test the monophyly of Chauliognathini and to verify the relationships among its genera, it was conducted a cladistic analysis of the tribe with 138 morphological characters involving 45 species representative of all the genera of Chauliognathini, and some of Ichthyurini, Silinae and Cantharinae. The 48 equally most parsimonious trees (length=341) showed that Chauliognathini is not monophyletic. Two main clades were found, grouping the genera according to the traditional classification of Chauliognathinae. The clade that represents the tribe Ichthyurini is retrieved in a clade composed by the short-elytra genera of Chauliognathini. The genera Chauliognathus, Daiphron, Malthesis, Belotus and Lobetus are also paraphyletic. Malthopterus belongs to the group composed by long-elytra genera, while Malthinocantharis must be excluded from Chauliognathini and positioned in Silinae
 
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Publishing Date
2013-05-14
 
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