| molecular phylogeny of soft ticks (ixodida: argasidae) inferred from mitochondrial genome and nuclear rrna sequences. | the genus-level classification of soft ticks (argasidae) is controversial. a previous phylogenetic analysis of morphological and developmental characters found that the genus ornithodoros was paraphyletic and raised a new genus, carios, for species previously in the genera antricola, argas, ornithodoros, and nothoaspis (klompen and oliver, 1993). genetic analyses of soft ticks to date have been limited to 16s rrna, which is not highly phylogenetically informative for this group. we sequenced the ... | 2014 | 24378079 |
| morphological and molecular description of immature stages of ornithodoros savignyi (acari: argasidae). | this study was designed to provide more details about larva, first nymph, and second nymph of ornithodoros savignyi using a combination of light microscopy (lm), scanning electron microscopy (sem), and partial sequence of mitochondrial 16s ribosomal ribonucleic acid (rrna). the main characteristics of larva are wrinkled integument with many grooves, gnathosoma without camerostome cheeks, hypostome with a pair of large teeth apically, and tarsus without humps. the comparisons between the first an ... | 2016 | 27117161 |
| arachnids of medical importance in brazil: main active compounds present in scorpion and spider venoms and tick saliva. | arachnida is the largest class among the arthropods, constituting over 60,000 described species (spiders, mites, ticks, scorpions, palpigrades, pseudoscorpions, solpugids and harvestmen). many accidents are caused by arachnids, especially spiders and scorpions, while some diseases can be transmitted by mites and ticks. these animals are widely dispersed in urban centers due to the large availability of shelter and food, increasing the incidence of accidents. several protein and non-protein compo ... | 2015 | 26273285 |
| structure and mechanism in salivary proteins from blood-feeding arthropods. | the saliva of blood-feeding arthropods contains rich mixtures of ligand binding proteins targeted at inhibiting hemostasis and inflammation in the host. since blood feeding has evolved many times, different taxonomic groups utilize completely different families of proteins to perform similar tasks. structural studies performed on a number of these proteins have revealed biologically novel and sophisticated mechanisms used to perform their functions. here, the results of these structural and mech ... | 2009 | 19925819 |
| are ticks venomous animals? | as an ecological adaptation venoms have evolved independently in several species of metazoa. as haematophagous arthropods ticks are mainly considered as ectoparasites due to directly feeding on the skin of animal hosts. ticks are of major importance since they serve as vectors for several diseases affecting humans and livestock animals. ticks are rarely considered as venomous animals despite that tick saliva contains several protein families present in venomous taxa and that many ixodida genera ... | 2014 | 25006341 |