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A new salamander from the late Paleocene-early Eocene of Ukraine.
- Source :
-
Acta Palaeontologica Polonica . 2012, Vol. 57 Issue 1, p135-148. 14p. - Publication Year :
- 2012
-
Abstract
- A new neotenic salamander, Seminobatrachus boltyschkensis gen. et sp. nov., is described based on 14 skeletons of late Paleocene-early Eocene age preserved on drill core slabs from the Cherkassy Region, central Ukraine. The new taxon is diagnosed by the following unique combination of characters: dorsal process of premaxilla posteriorly elongate and overlaps frontal; maxilla greatly reduced in size; parietal-squamosal contact absent; vomerine tooth row long and parallel to maxillary arcade; pterygoid has long anterior process; quadrate ossified; marginal and palatal teeth pedicellate; trunk vertebrae amphicoelous, each having a subcentral keel, anterior basapophysis, and spinal nerve foramina; ribs bicipital; carpals and tarsals unossified; and phalangeal formulae of 2-2-3-2 and 2-2-3-4-2 for manus and pes, respectively. Phylogenetic analysis nests S. boltyschkensis within Urodela (i.e., crown-clade salamanders), but its exact phylogenetic position is equivocal, resolving in one of three ways: (1) in an unresolved trichotomy with Salamandra and (Ambystomatidae + (Dicamptodon + Rhyacotriton)) (results obtained in NONA v. 2.0, with the WINCLADA v. 1.00.08 interface; the parsimony ratchet (island hopper) algorithm), (2) as a sister taxon of (Salamandra + (Ambystomatidae + (Dicamptodon + Rhyacotriton))) clade (results obtained in TNT v. 1.1; the implicit enumeration search algorithm) or (3) as a sister taxon of Ambystomatidae (results obtained in PAUP v. 4.0b 10; the branch-and-bound search algorithm). [ABSTRACT FROM AUTHOR]
- Subjects :
- *FOSSIL salamanders
*PHYLOGENY
*PALEOCENE Epoch
*EOCENE Epoch
Subjects
Details
- Language :
- English
- ISSN :
- 05677920
- Volume :
- 57
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Acta Palaeontologica Polonica
- Publication Type :
- Academic Journal
- Accession number :
- 89283769
- Full Text :
- https://doi.org/10.4202/app.2010.0101