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A new view on the morphology and phylogeny of eugregarines suggested by the evidence from the gregarine (Leuckart, 1860) Labbé, 1899 (Apicomplexa: Eugregarinida).
PeerJ
May 2017
Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russian Federation.
Background: Gregarines are a group of early branching Apicomplexa parasitizing invertebrate animals. Despite their wide distribution and relevance to the understanding the phylogenesis of apicomplexans, gregarines remain understudied: light microscopy data are insufficient for classification, and electron microscopy and molecular data are fragmentary and overlap only partially.
Methods: Scanning and transmission electron microscopy, PCR, DNA cloning and sequencing (Sanger and NGS), molecular phylogenetic analyses using ribosomal RNA genes (18S (SSU), 5.
Clado- and semogenetic approaches, when used in concert, make it possible to resolve questions concerning phylogenetic relationships between a group representatives as well as phylogenesis of those representatives' traits. Parental care patterns and other forms of reproductive behavior, along with a reproductive strategy as a whole, can be subjects for semogenetic analysis to no lesser extent than morphological structures sensu stricto. One of the highly specialized forms of parental care in fishes, including suborder of labyrinth fishes and their sisterly groups, appears to be parental food provisioning.
View Article and Find Full Text PDFDifferent genomic evolutionary rates in the various reptile lineages.
Gene
August 2002
Istituto di Biologia e Genetica, Facoltà di Scienze, Università di Ancona, Via Brecce Bianche, Ancona, Italy.
Although Reptiles occupy a strategic position among terrestrial vertebrates, studies of the composition and evolution of their genome are scarce. The cytogenetic analysis of nearly 1400 species evidenced different karyotypical evolutionary rates and different G-banding structures in turtles and crocodiles on the one hand and squamates on the other. A similar dichotomy was also identified through the study of the quantitative and compositional characteristics of the genome.
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