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Phylogenetic position af Actinotrichida mites (Chelicerata) and comparative spermatology of Halacaridae (Actinotrichida)

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Author(s):
Almir Rogério Pepato
Total Authors: 1
Document type: Doctoral Thesis
Press: São Paulo.
Institution: Universidade de São Paulo (USP). Instituto de Biociências (IBIOC/SB)
Defense date:
Examining board members:
Carlos Eduardo Falavigna da Rocha; Pedro Gnaspini Netto; Gilberto José de Moraes; Ricardo Pinto da Rocha; Jose Roberto Machado Cunha da Silva
Advisor: Carlos Eduardo Falavigna da Rocha
Abstract

This study aimed to assess the phylogenetic position of the order Acariformes, describe the sperm cell morphology, accompanying secretions and spermiogenesis of halacarid mites. Eventually, it was also intended to describe a new species and occurrences along the São Paulo State coastline. The phylogenetic position of Acariformes mites is examined employing SSU, partial LSU sequences, and the morphology of 91 extant terminals. The hypotheses regarded as better encompassing the evidence gathered is that yielded by the combined analysis of morphology and partially aligned sequences using the secondary structure as a guide to the alignment. It has yielded to a topology including a clade composed by (Palpigradi (Solfugae Acariformes) and other by (Ricinulei Tetrapulmonata). The seeming stability of certain clades not recovered here, as Haplocnemata and Acari, are regarded as the byproduct of the way as molecular homology was established by the instrumentalist approach implemented in POY inprevious studies. Ultrastructural observations on spermiogenesis, sperm cell and reproductive system of sixteen species belonging to Halacaridae are presented. The espermatological information supports a basal position for genus Rhombognathus, which presents a diphuse pattern of chromatin condensation and crested mitochondria, instead of the derivate centripetal pattern and annular mitochondria observed in the remaining clades, data also support a close relationship between the genus Arhodeoporus and Copidognathinae and sister group relationship between the genera Halacarus and Thalassarachna. Finally, the genus Halacaroides is recorded from the Brazilian coastline for the first time. (AU)

FAPESP's process: 05/03458-1 - Phylogeny of Halacaridae (Acari: Prostigmata) inferred from fine morphology of spermatozoa and molecular data
Grantee:Almir Rogério Pepato
Support Opportunities: Scholarships in Brazil - Doctorate