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Revised hypotheses for phylogenetic homology of the stomatostylet in tylenchid nematodes

Revised hypotheses for phylogenetic homology of the stomatostylet in tylenchid nematodes AbstractMolecular phylogenetic systematics suggest that Tylenchida share an immediate ancestor with Cephalobina. This relationship has implications, contradicting classical views, for evolution of the stomatostylet and homology with the cephalobid stoma. Emerging evidence from comparative TEM and 3D modelling is the basis for hypothesising that the tylenchid stylet, specifically the cone and shaft, is homologous with cuticle associated with arcade syncytia of the cephalobid gymnostom; furthermore, the stylet knobs and associated m1 protractors, are prostegostom. The guiding apparatus through which the stylet moves is lined by epidermal syncytia and is homologous with the cephalobid cheilostom. Junctional complexes associated with the epidermal syncytia of the cheilostom and adjacent gymnostom arcade cells occur in both cephalobids and tylenchids, but in the latter the membrane complexes are folded and modified as the guide ring. Testing of the hypothesis requires clearer phylogenetic resolution as well as additional ultrastructural and developmental observations of representatives of tylenchids and outgroups. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nematology Brill

Revised hypotheses for phylogenetic homology of the stomatostylet in tylenchid nematodes

Nematology , Volume 6 (5): 10 – Jan 1, 2004

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Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
1388-5545
eISSN
1568-5411
DOI
10.1163/1568541042843559
Publisher site
See Article on Publisher Site

Abstract

AbstractMolecular phylogenetic systematics suggest that Tylenchida share an immediate ancestor with Cephalobina. This relationship has implications, contradicting classical views, for evolution of the stomatostylet and homology with the cephalobid stoma. Emerging evidence from comparative TEM and 3D modelling is the basis for hypothesising that the tylenchid stylet, specifically the cone and shaft, is homologous with cuticle associated with arcade syncytia of the cephalobid gymnostom; furthermore, the stylet knobs and associated m1 protractors, are prostegostom. The guiding apparatus through which the stylet moves is lined by epidermal syncytia and is homologous with the cephalobid cheilostom. Junctional complexes associated with the epidermal syncytia of the cheilostom and adjacent gymnostom arcade cells occur in both cephalobids and tylenchids, but in the latter the membrane complexes are folded and modified as the guide ring. Testing of the hypothesis requires clearer phylogenetic resolution as well as additional ultrastructural and developmental observations of representatives of tylenchids and outgroups.

Journal

NematologyBrill

Published: Jan 1, 2004

Keywords: GYMNOSTOM; EVOLUTION; TYLENCHIDA; FINE STRUCTURE; CHEILOSTOM; CEPHALOBINA; STOMA; DEVELOPMENT; STEGOSTOM

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