Phylogenetic relationships among loliginid squids (Cephalopoda : Myopsida)based on analyses of multiple data sets

Authors
Citation
Fe. Anderson, Phylogenetic relationships among loliginid squids (Cephalopoda : Myopsida)based on analyses of multiple data sets, ZOOL J LINN, 130(4), 2000, pp. 603-633
Citations number
71
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences
Journal title
ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY
ISSN journal
0024-4082 → ACNP
Volume
130
Issue
4
Year of publication
2000
Pages
603 - 633
Database
ISI
SICI code
0024-4082(200012)130:4<603:PRALS(>2.0.ZU;2-N
Abstract
The phylogenetic relationships among the loliginid squids, a species-rich g roup of shallow-water muscular squids, have been investigated recently usin g several approaches, including allozyme electrophoresis and analyses of mo rphological and DNA sequence data, vet no consensus has been reached. This study examines the effects of combining multiple data sets (morphology, all ozymes and DNA sequence data from two mitochondrial genes) on estimates of loliginid phylogeny. Various data combinations were analysed under three ma ximum parsimony weighting schemes: equal weights for all characters, succes sive approximations and implicit weights parsimony. When feasible, support for branches within trees Tvas assessed with nonparametric bootstrapping an d decay analysis. Some ingroup relationships were consistent across all ana lyses, but relationships among outgroup taxa and basal ingroup taxa varied. Combining data increased bootstrap support for several nodes. Methods that downweight highly variable characters (i.e. successive approximations and implicit weights parsimony) produced very similar trees which included two major clades: a clade consisting of all species sampled from American water s (except Sepioteuthis), and a clade of several east Atlantic species (Loli go forbesi Steenstrup, Loligo vulgaris Lamarck and Loligo reynaudi d'Orbign y) plus several Indo-West Pacific species in the genera Uroteuthis , and Lo liolus. The Sepioteuthis species occupied a basal position within Loliginid ae, but Sepioteuthis itself was not always monophyletic. The position of a clade of a few Lolliguncula species and Loligo (Alloteuthis) also varied ac ross analyses. A new loliginid classification is proposed based on these fi ndings. (C) 2000 The Linnean Society of London.