Phylogenetic analyses of the Thomasomyini (Muroidea: Sigmodontinae) based on morphological data.
Item
-
Title
-
Phylogenetic analyses of the Thomasomyini (Muroidea: Sigmodontinae) based on morphological data.
-
Identifier
-
AAI3103154
-
identifier
-
3103154
-
Creator
-
Pacheco, Victor R.
-
Contributor
-
Adviser: Robert S. Voss
-
Date
-
2003
-
Language
-
English
-
Publisher
-
City University of New York.
-
Subject
-
Biology, Zoology | Biology, Anatomy
-
Abstract
-
In part I, the phylogenetic relationships of Thomasomyini were examined based on diverse sets of morphological data (122 characters) for 59 species. Thirty two genera from all the sigmodontine tribes were analyzed as ingroup taxa. Thirteen non-sigmodontine genera were included as outgroups. The monophyly of the thomasomyine group was supported, but with low decay and bootstrap values. The monophyly of Sigmodontinae (sensu Reig, 1980) is moderately supported. The tribal level groups oryzomyines, scapteromyines, and ichthyomyines were also found to be monophyletic; but not the akodontines and phyllotines. Ichthyomyini was placed at the base of the Sigmodontinae. The Oryzomyini and Thomasomyini appear to be sister taxa, sustaining the "pentalophodont" concept of Hershkovitz (1962). The Thomasomyini includes: Abrawayaomys, Aepeomys, Chilomys, Delomys, Juliomys, Phaenomys, Rhagomys, Rhipidomys, Thomasomys (including Erioryzomys, and Inomys), Wiedomys, and Wilfredomys. Delomys and Phaenomys are placed at the base of the tribe. The tribe Wiedomyini Reig, 1980 is synonymized to Thomasomyini. The pairs Wilfredomys + Wiedomys, and Abrawayaomys + Rhagomys are found closely related. A monophyletic "Andean" thomasomyine group that includes Aepeomys, Chilomys, Rhipidomys, and Thomasomys is supported. However, the genera Thomasomys and Rhipidomys do not appear to be monophyletic. Aepeomys is nested in a clade of Thomasomys species.;In part II, the monophyly of the Andean thomasomyine group of the Thomasomyini is tested with denser taxon sampling and several suits of morphological characters. The Andean thomasomyine group appears to be monophyletic, and includes Aepeomys, Chilomys, Rhipidomys, and Thomasomys s.l. The monophyly of Chilomys and Rhipidomys is supported. However, Thomasomys as currently understood is clearly polyphyletic; whereas most species of Thomasomys together with Aepeomys lugens and A. reigi cluster with T. cinereus (the type species of Thomasomys ), a group of seven species show closer affinities with Rhipidomys. Several generic-level monophyletic groups are recognized and diagnosed to maintain a phylogenetic taxonomy. In addition to Thomasomys s.s. (36 species), these generic-level groups include the aureus group (11 species), the macrotis group (1 species), the oreas group (4 species), the notatus group (1 species), and the baeops group (2 species). Aepeomys, Inomys, and Erioryzomys are synonymized with Thomasomys.
-
Type
-
dissertation
-
Source
-
PQT Legacy CUNY.xlsx
-
degree
-
Ph.D.
