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The snake family Lamprophiidae Fitzinger (Serpentes: Elapoidea) is a putatively Late Eocene radiation of nocturnal snakes endemic to the African continent. It incorporates many of the most characteristic and prolific of Africa's non-venomous snake species, including the widespread type genus Lamprophis Fitzinger, 1843 (house snakes). We used approximately 2500 bases of mitochondrial and nuclear DNA sequence data from 28 (41%) of the approximately 68 recognised lamprophiid species in nine of the eleven genera to investigate phylogenetic structure in the family and to inform taxonomy at the generic level. Cytochrome b, ND4 and tRNA gene sequences (mitochondrial) and c-mos sequences (nuclear) were analysed using Maximum Likelihood, Bayesian Inference and Maximum Parsimony methods. The genus Mehelya Csiki, 1903 was paraphyletic with respect to Gonionotophis Boulenger, 1893. To address this, the concept of Gonionotophis is expanded to include all current Mehelya species. The genus Lamprophis emerged polyphyletic: the enigmatic Lamprophis swazicus was sister to Hormonotus modestus from West Africa, and not closely related to its nominal congeners. It is moved to a new monotypic genus (Inyoka gen. nov.). The remaining Lamprophis species occur in three early-diverging lineages. (1) Lamprophis virgatus and the widely distributed Lamprophis fuliginosus species complex (which also includes Lamprophis lineatus and Lamprophis olivaceus) formed a clade for which the generic name Boaedon Duméril, Bibron & Duméril, 1854 is resurrected. (2) The water snakes (Lycodonomorphus) were nested within Lamprophis (sensu lato), sister to Lamprophis inornatus. We transfer this species to the genus Lycodonomorphus Fitzinger, 1843. (3) We restrict Lamprophis (sensu strictissimo) to a small clade of four species endemic to southern Africa: the type species of Lamprophis Fitzinger, 1843 (Lamprophis aurora) plus Lamprophis fiskii, Lamprophis fuscus and Lamprophis guttatus.  相似文献
2.
Although many wide-ranging taxa occur in Madagascar, phylogeographic studies for most of these species are still lacking. This is especially the case for snakes, where of more than 100 endemic species, the population structure of only two species has so far been examined. Here, we examine genetic population structure of one of the most common snakes of Madagascar, Mimophis mahfalensis (Grandidier, 1867). This taxon is the only representative of Psammophiinae in Madagascar, where the majority of species in this subfamily is distributed throughout mainland Africa. Applying an integrative approach, where both morphological data and genetic results from coalescent species delimitation analyses are considered, we determine that Mimophis mahfalensis is composed of two distinct taxa: M. mahfalensis in the central montane and southern parts of Madagascar, and a second new species restricted to the north and north-west, which we describe here. We also examine the colour pattern polymorphism exhibited in Mimophis, which has been previously hypothesized as sexually dimorphic and/or geographically correlated. However, we find all three colour morphs in both sexes, and both species of Mimophis. Our work highlights the importance of phylogeographic studies that examine wide-ranging taxa to detect cryptic species diversity, even amongst species that are common, or have been previously considered to be well known.

www.zoobank.org/lsid:zoobank.org:pub:9791DC0B-49E5-4571-884C-4AA85EAF2472  相似文献

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2020年7月,在四川省凉山彝族自治州雷波县采集到1号蛇类标本,基于形态比较和线粒体细胞色素b(Cyt b)基因序列重建的分子系统关系,确定该标本为屋蛇科(Lamprophiidae)紫沙蛇属(Psammodynastes)的紫沙蛇(P. pulverulentus),系四川省蛇类分布新记录种。基于Cyt b基因序列计算的遗传距离显示,来自四川、广西、广东、云南、海南、福建、纳米比亚的紫沙蛇个体之间遗传距离为3.6%~9.9%,差异较大,其种下关系亟待进一步研究和厘定。  相似文献
4.
In this first cytogenetic survey on the lamprophiid snake subfamily Pseudoxyrhophiinae, we studied the karyology of ten snake species belonging to seven genera from Madagascar (Compsophis, Leioheterodon, Liophidium, Lycodryas, Madagascarophis, Phisalixella and Thamnosophis) using standard and banding methods. Our results show a wide range of different karyotypes ranging from 2n = 34 to 2n = 46 elements (FN from 40 to 48), with nucleolus organizer regions (NORs) on one (plesiomorphic) or two (derived/apomorphic) microchromosome pairs, and W chromosome at early or advanced states of diversification from the Z chromosome. The observed W chromosome variations further support the most accepted hypothesis that W differentiation from the Z chromosome occurred by progressive steps. We also propose an evolutionary scenario for the observed high karyotype diversity in this group of snakes, suggesting that it is derived from a putative primitive pseudoxyrhophiine karyotype with 2n = 46, similar to that of Leioheterodon geayi, via a series of centric fusions and inversions among macrochromosomes and translocations of micro‐ either to micro‐ or to macrochromosomes. This primitive Pseudoxyrhophiinae karyotype might have derived from a putative Lamprophiidae ancestor with 2n = 48, by means of a translocation of a micro‐ to a macrochromosome. In turn, the karyotype of this lamprophiid common ancestor may have derived from the assumed primitive snake karyotype (2n = 36 chromosomes, with 16 biarmed macro‐ and 20 microchromosomes) by a series of centric fissions and one inversion. © 2014 The Linnean Society of London, Biological Journal of the Linnean Society, 2014, 112 , 450–460.  相似文献
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