| correlation of parasite speciation and specificity with host evolutionary relationships. | protopolystoma (monogenea, polystomatidae) is strictly specific to the anuran amphibian genus xenopus. the host group is characterised by a polyploid series in which chromosome numbers reflect diploid, tetraploid, octoploid and dodecaploid constitutions; the series is considered to have evolved through interspecies hybridisation and genome duplication. this study correlates information on host evolutionary relationships with patterns of parasite speciation and host specificity. protopolystoma is ... | 1998 | 9801916 |
| description of a new octoploid frog species (anura: pipidae: xenopus) from the democratic republic of the congo, with a discussion of the biogeography of african clawed frogs in the albertine rift. | we describe a new octoploid species of african clawed frog (xenopus) from the lendu plateau in the northern albertine rift of eastern democratic republic of the congo. this species is the sister taxon of xenopus vestitus (another octoploid), but is distinguished by a unique morphology, vocalization and molecular divergence in mitochondrial and autosomal dna. using a comprehensive genetic sample, we provide new information on the species ranges and intra-specific diversity of african clawed frogs ... | 2011 | 21546992 |
| host-defense peptides from skin secretions of the octoploid frogs xenopus vestitus and xenopus wittei (pipidae): insights into evolutionary relationships. | the primary structures of host-defense peptides have proved useful in elucidating the evolution history of frogs. peptidomic analysis was used to compare the diversity of host-defense peptides in norepinephrine-stimulated skin secretions from the octoploid frogs, xenopus vestitus (kivu clawed frog) and xenopus wittei (de witte's clawed frog) in the family pipidae. structural characterization demonstrated that the x. vestitus peptides belong to the magainin (3 peptides), peptide glycine-leucine-a ... | 2014 | 25086320 |
| the karyotype of the tetraploid species xenopus vestitus laurent (anura: pipidae). | xenopus vestitus possesses 72 chromosomes, wherease in the majority of known xenopus species there are 2n = 36. during meiosis, 36 bivalents are usually observed at metaphase i and 36 chromosomes at metaphase ii. arranged according to size and centromere position, the chromosomes form the same basic morphologic groups typical of the genus xenopus. however, the groups are composed of quartets of four similar chromosomes instead of diploid pairs of homologs. the exception to this arrangement invol ... | 1977 | 611004 |