last update: globalnames score not available match type not available. author_text: (Tschudi, ) display_name: Alsophis elegans. Expert(s). Expert: Notes: Reference for: Other Source(s). Source: Snake Species of the World, vol. undetermined, manuscript (version ). Acquired: Cryptocercus matilei Grandcolas, in GBIF Secretariat (). GBIF Backbone Taxonomy. Checklist dataset accessed via.
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Snake phylogeny based on osteology, soft anatomy and ecology.
Hemipenial body much longer than the lbes more than twice the lengthwith the aulcate side of the hemipenial body covered with two parallel rows of enlarged body calyces on most or all its surface.
DissertationUniversity of Kansas, Lawrence. TNT, a free program for phylogenetic analysis. Within Alsophiini, the hierarchy of relationships we find are strongly supported by morphological evidence presented by Zaher The caenophidian tree was rooted using a boine, Boa constrictor, as an outgroup.
No molecular study, including ours, has sampled more than one or two species of xenodermatids.
Media | Zoological Collections | The Field Museum
The monophyly of the Elapoidea is currently supported exclusively by molecular data and further inquiry on its composition is needed. We present a molecular phylogenetic analysis of caenophidian advanced snakes using sequences from two mitochondrial genes 12S and 16S rRNA and one nuclear c-mos gene total base pairsand with terminal taxa sampled from throughout all major caenophidian lineages but focussing on Neotropical xenodontines.
This clade is supported by a single putative morphological synapomorphy: Elehans results show that Alsophis is polyphyletic, with the species of western Peru A. Source indicates the source of a classification NOT a taxon name.
Alsophis – Wikispecies
Molecular phylogeny of elapid snakes and a consideration of their biogeographic history. Viperids are nested within the successive outgroups of pareatines and xenodermatines, whereas elapids are nested higher in the tree among some primarily-African ‘colubrid’ clades. Nonetheless, we recognize that some names will require changes in definition with improved knowledge of phylogeny, particularly among “colubroid” snakes sensu Romer, Cadle IV ; Robert W.
Animalia a,sophis [ more like this term ] [ including rank ] [ from this source ] Chordata phylum [ more like this term ] [ including rank ] [ from this source ] Reptilia class [ more like this term ] [ including rank ] [ from this source ] Squamata order [ more like this term ] [ including rank ] [ from this source ] Alsopuis suborder [ more like this term ] [ including rank ] [ from this source ] Alspphis family [ more like this term ] [ including rank ] [ from this source ] Xenodontinae subfamily [ more like this term ] [ including rank ] [ from this source ] Alsophis genus [ more like alspphis term ] [ including rank ] [ from this source ] Alsophis elegans species [ more like this term ] [ including rank ] [ from this source ] Data from source Elegsns Backbone Taxonomy [ Classifications ] [ Top ] last update: Dipsadini in Peru and Ecuador, with comments on the systematics of Dipsadini.
Further alxophis analysis of the results from POY was obtained by analyzing the optimal implied alignment in TNT, which identified 53 optimal topologies of steps, one of which is identical to our Figure 1. Spinulate flounce-like structures are also present on the hemipenial lobes of some atractaspidid genera Zaher,and might represent a synapomorphy uniting this family with the Lamprophiinae.
We prefer a combination of the two data sources.
Alsophis elegans – Serpiente corredora elegante -Elegant racer –
Although we do not fully adopt the philosophy and procedures elaborated by Frost et al. In Zaher’s taxonomy, Xenodermatinae, Homalopsinae, Boodontinae, and Pseudoxyrhophiinae were explicitly recognized using enclosing quotation marks alskphis possibly non-monophyletic working hypotheses requiring validation. Hemipenis generally deeply bilobed, bicalyculate, semicapitate, with a forked sulcus spermaticus dividing on the proximal half of the body, with branches extending centrolineally until the base of the capitula, here it takes a centrifugal position on the lobe, ending in the distal region; intrasulcar region mostly nude, without spines; enlarged lateral spines of moderate size and numerous; capitula formed by diminutive papillate calyces and are most restricted to the sulcate side; asulcate and medial surfaces of the lobes almost completely nude, except for the presence of a medial papillate and inflated crest or ridge that runs from the lobular crotch to the distal edge of each capitulum; vestigial body calyces along all the internal region of the lobes.
Help us improve the site by taking our survey. Remarques comparatives avec Malpolon moilensis et Psammophis spp. Relationships and distributions of the snakes allied to the genus Pseudoboa. Phylogenetic relationships alsoohis colubroid snakes based on mitochondrial DNA sequences. The phylogenetic relationship of Colubrinae, Elapidae and Viperidae and the evolution of front-fanged venom systems in snakes.
Hemipenes extremely reduced, threadlike Bogert, ; sulcus spermaticus undivided and in centrolineal orientation; differentiated maxillary and mandibular dentition Bogert, ; Bourgeois, ; loss of hypapophyses on posterior trunk vertebrae. Gnathostomata above family [ more like this term ] [ including rank ] [ from this source ]. American Museum Novitates, American Museum Novitates Eegans snout of thamnophiine snakes.
Ecuador, Peru, Chile Type locality: The optimization of these characters on the tree depends on a better understanding of the position of Heterodon and Farancia that are here included in Dipsadidae incertae sedis. Relationships among African and Eurasian species are largely unresolved. Multiple colonization of Madagascar and Socotra by colubrid snakes: Hemipenis unilobed and unicapitate; sulcus spermaticus divides relatively distally, within the calyculate region; large nude region present on asulcate side of the hemipenial body.
Data from source Union 4 [ Classifications ] [ Top ] last update: Thus, further revisions on that issue may be warranted. We believe this reflects the lack of a broad comparative morphological perspective for snakes, rather than weak support for any particular clade some of the clades that have weak morphological support are strongly supported by molecular data.
Liophis amarali shows no close affinities to the genus Liophis or even to the tribe Xenodontini see the new tribe Caaeteboiini for more details. Higher-level relationships of snakes inferred from four nuclear and mitochondrial genes.