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Sébastien Lavoué Masaki Miya Akira Kawaguchi Tetsuo Yoshino Mutsumi Nishida 《Ichthyological Research》2008,55(4):328-334
Molecular characters may offer a useful alternative to confidently estimate the phylogenetic position of paedomorphic taxa
otherwise difficult to place based on morphology because of the reduction or absence of characters in their larvae-like adult
stage. Here, we sequenced the complete mitogenome of a remarkable undescribed marine paedomorphic clupeiform fish to gain
insight into its phylogenetic position. Of a length of 17,507 bp, this mitogenome exhibits a unique gene order within the
Teleostei because of the inversion of the contiguous tRNAGln and tRNAIle within the IQM region and the presence of a putative second control region inserted between these tRNAs. Mitogenomic data
from 27 clupeiform species and 22 non-clupeiform species were subjected to partitioned maximum likelihood and Bayesian analyses.
All resultant phylogenetic trees strongly supported the placement of this undescribed taxon within the order Clupeiformes,
suborder Clupeoidei, and the family Clupeidae, as the sister group of the tribe Spratelloidini (Jenkinsia + Spratelloides) of the subfamily Dussumieriinae. Together, they form a monophyletic group with Chirocentrus and, possibly, Etrumeus. Despite its overall resemblance to Sundasalanx, this undescribed taxa (Clupeidae gen. et sp. indet.) is not closely related to that genus and represents an independent
paedomorphic lineage within the Clupeoidei.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
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Vitelbina Núez Pedro Cid Libia Sanz Pilar De La Torre Yamileth Angulo Bruno Lomonte Jos María Gutirrez Juan J. Calvete 《Journal of Proteomics》2009,73(1):57-78
The venom proteomes of Bothrops atrox from Colombia, Brazil, Ecuador, and Perú were characterized using venomic and antivenomic strategies. Our results evidence the existence of two geographically differentiated venom phenotypes. The venom from Colombia comprises at least 26 different proteins belonging to 9 different groups of toxins. PI-metalloproteinases and K49-PLA2 molecules represent the most abundant toxins. On the other hand, the venoms from Brazilian, Ecuadorian, and Peruvian B. atrox contain predominantly PIII-metalloproteinases. These toxin profiles correlate with the venom phenotypes of adult and juvenile B. asper from Costa Rica, respectively, suggesting that paedomorphism represented a selective trend during the trans-Amazonian southward expansion of B. atrox through the Andean Corridor. The high degree of crossreactivity of a Costa Rican polyvalent (Bothrops asper, Lachesis stenophrys, Crotalus simus) antivenom against B. atrox venoms further evidenced the close evolutionary kinship between B. asper and B. atrox. This antivenom was more efficient immunodepleting proteins from the venoms of B. atrox from Brazil, Ecuador, and Perú than from Colombia. Such behaviour may be rationalized taking into account the lower content of poorly immunogenic toxins, such as PLA2 molecules and PI-SVMPs in the paedomorphic venoms. The immunological profile of the Costa Rican antivenom strongly suggests the possibility of using this antivenom for the management of snakebites by B. atrox in Colombia and the Amazon regions of Ecuador, Perú and Brazil. 相似文献
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Robin J. Smith Takahiro Kamiya David J. Horne Akira Tsukagoshi 《Zoologischer Anzeiger》2005,243(3):139-153
A data set of the number of setae on the maxillular branchial plate of podocopan ostracods was compiled from published drawings and our own dissections. A total of 168 species in six superfamilies were covered, with the Cytheroidea, Cypridoidea and Bairdioidea being best represented. The number of setae is shown to be independent of the size of the ostracod and the environment in which the species lives, but to have phylogenetic significance at superfamily level. Ontogenetic data suggest that the low number of branchial plate setae in many cytheroidean families is a paedomorphic phenomenon. 相似文献
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