Some Notes on Nomenclature (Nematoda)

Baker, A. D.; Sanwal, K. C.

doi:10.1017/s0022149x0000479x

Cited by 3 publications

(1 citation statement)

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“…We do not adopt a particular classification a priori, but for the purppse of clarity, higher taxonomic categories used in this paper are based on the system proposed by Maggenti (1981). Consistent with Maggenti (1981) we also use Diplogasterina versus the synonym Diplogastrinae (discussed by Baker and Sanwal 1969). Resolution of these relationships requires the collection of additional data; ideally these data should be independent of the morphological characters we propose to evaluate.…”

Section: Introductionmentioning

confidence: 92%

The buccal capsule of Aduncospiculum halicti (Nemata: Diplogasterina): an ultrastructural and molecular phylogenetic study

Jg¹,

Giblin-Davis²,

Cd³

et al. 1997

Can. J. Zool.

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The buccal capsule of Aduncospiculum halicti (Diplogasterina) is compared with that of Zeldia punctatu (Cephalobina) and Caenorhabditis elegans (Rhabditina). Characters are mapped on an independent DNA-based phylogenetic tree (inferred from RNA polymerase I1 and rDNA sequences) to test evolutionary hypotheses. Irrespective of dimorphism, the buccal capsule wall of A. halicti consists of an anterior to posterior series of six cuticular structures classically termed rhabdions. These are defined according to their internal differentiations, discontinuities in profiles, and underlying tissues. Homologies of rhabdions 1 and 2 in A. halicti are proposed on the basis of position and association with adjacent tissues, consistent with those of Cephalobina and Rhabditina. Rhabdion 3 is associated with radial epithelial cells as is the mesorhabdion in C. elegans; this contrasts with Z. punctata, where a rhabdion in a similar position is associated with radial muscle cells. Dorsal and subventral teeth in A. halicti comprise rhabdions 4 and 5; this may be homologous with a corresponding region in Z. punctuta but contrasts with C. elegans, where the corresponding region consists of a single metarhabdion. These characters, when mapped on the sequence-based tree, suggest that A. halicti and Diplogasterina share with C. elegans and other Rhabditina derived characters, including a mesorhabdion associated with epithelial cells, but retain some apparently primitive features shared with Cephalobina. RCsumC: La capsule buccale d'Aduncospiculum halicti (Diplogasterina) est comparke a celle de Zeldia punctata (Cephalobina) et a celle de Caenorhabditis elegans (Rhabditina). Les caractkres sont cartographiks sur un arbre phylogknktique bask sur I'ADN (d'aprks I'ARN polymkrase I1 et les skquences d'ADNr) en vue d'kprouver des hypothkses kvolutives. Sans tenir compte du dimorphisme, la paroi de la capsule buccale d'A. halicti est constituke d'une skrie de six structures cuticulaires appelkes rhabdions orientkes de l'avant a l'arrikre. Ces strutures se distinguent par des diffkrenciations internes, des profils discontinus et par les tissus qui leur sont sous-jacents. Des homologies des rhabdions 1 et 2 chez A. halicti sont proposees en fonction de leur position et de leur association aux tissus adjacents, caractkristiques semblables 2 celles qui prkvalent chez les Cephalobina et les Rhabditina. Le rhabdion 3 est associee a des cellules kpithkliales radiales, comme dans le mksorhabdion de C. elegans; chez Z. punctata, un rhabdion en position semblable est associk a des cellules musculaires radiales. Les dents dorsales et sub-ventrales d'A. halicti sont formkes des rhabdions 4 et 5; il s'agit peut-ttre la d'une configuration homologue d'une region correspondante chez Z. punctata, mais cette configuration diffkre de celle qui prkvaut chez C. elegans chez lequel la rkgion similaire comporte un seul mktarhabdion. Ces caractkres, lorsqu'intkgrks dans l'arbre phylogknktique bask sur I'ADN, semblent indiquer qu'A. halicti et les Diplogasterina on...

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Section: Introductionmentioning

confidence: 92%