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- Title
Current Understanding of Ecdysozoa and its Internal Phylogenetic Relationships.
- Authors
Giribet, Gonzalo; Edgecombe, Gregory D.
- Abstract
Twenty years after its proposal, the monophyly of molting protostomes--Ecdysozoa--is a well-corroborated hypothesis, but the interrelationships of its major subclades are more ambiguous than is commonly appreciated. Morphological and molecular support for arthropods, onychophorans and tardigrades as a clade (Panarthropoda) continues to be challenged by a grouping of tardigrades with Nematoida in some molecular analyses, although onycho- phorans are consistently recovered as the sister group of arthropods. The status of Cycloneuralia and Scalidophora, each proposed by morphologists in the 1990s and widely employed in textbooks, is in flux: Cycloneuralia is typically non- monophyletic in molecular analyses, and Scalidophora is either contradicted or incompletely tested because of limited genomic and transcriptomic data for Loricifera, Kinorhyncha, and Priapulida. However, novel genomic data across Ecdysozoa should soon be available to tackle these difficult phylogenetic questions. The Cambrian fossil record indicates crown-group members of various ecdysozoan phyla as well as stem-group taxa that assist with reconstructing the most recent common ancestor of panarthropods and cycloneuralians.
- Subjects
ECDYSOZOA; PHYLOGENY; ARTHROPODA; TARDIGRADA; ONYCHOPHORA; FOSSIL arthropods
- Publication
Integrative & Comparative Biology, 2017, Vol 57, Issue 3, p455
- ISSN
1540-7063
- Publication type
Article
- DOI
10.1093/icb/icx072