UnissResearch

Logo Universitàegli studi di Sassari
titoli, abstracts, parole chiave >>>
The Interrelationships of Proseriata (Platyhelminthes: Seriata) tested with molecules and morphology

Littlewood, Timothy J. and Curini Galletti, Marco and Herniou, Elisabeth A. (2000) The Interrelationships of Proseriata (Platyhelminthes: Seriata) tested with molecules and morphology. Molecular Phylogenetics and Evolution, Vol. 16 (3), p. 449-466. ISSN 1055-7903. Article.

Full text not available from this repository.

DOI: 10.1006/mpev.2000.0802

Abstract

Proseriate flatworms are common members of the interstitial benthic fauna worldwide, predominantly occupying marine environments. As minute animals, having relatively few characters useful for cladistic analysis, they have been difficult to present in a phylogenetic framework using morphology alone. Here we present a new morphological matrix consisting of 16 putatively homologous characters and two molecular data sets to investigate further this major group of free-living members of the Platyhelminthes. Complete 18S rDNA (representing 277 parsimony-informative characters) from 17 ingroup taxa and partial 28S rDNA spanning variable expansion regions D1 to D3 and D1 to D6 (representing 219 and 361 parsimony-informative characters, respectively) from 27 and 14 ingroup taxa, respectively, were determined and aligned as complementary data sets. Morphological and molecular data sets were analyzed separately and together to determine underlying phylogenetic patterns and to resolve conflict between published scenarios based on morphology alone. The monophyly of the Proseriata cannot be confirmed categorically with any of these data sets. However, the constituent taxa are confirmed as basal members of the Neoophora, and a sister group relationship with Tricladida is rejected. Similarly, the monophyly of one of the two subtaxa of the Proseriata, the Lithophora, could not be confirmed with molecules. Concerning intragroup relationships, we could reject one of the two phylogenetic trees formerly proposed, as well as the clade Otoplanidae + Coelogynoporidae. However, a clade Otoplanidae + Archimonocelididae + Monocelididae (to which the Monotoplanidae belong) was supported, and the position of the genus Calviria shifted from the Archimonocelididae to the Coelogynoporidae.

Item Type:Article
ID Code:4138
Status:Published
Refereed:Yes
Uncontrolled Keywords:Proseriata, phylogeny, 18S rDNA, 28S rDNA, Platyhelminthes, flatworms
Subjects:Area 05 - Scienze biologiche > BIO/05 Zoologia
Divisions:001 Università di Sassari > 01 Dipartimenti > Zoologia e genetica evoluzionistica
Publisher:Academic Press / Elsevier
ISSN:1055-7903
Deposited On:12 Jul 2010 12:05

I documenti depositati in UnissResearch sono protetti dalle leggi che regolano il diritto d'autore

Repository Staff Only: item control page