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Bryozoa: Living and fossil species of the catenicellid subfamilies Ditaxiporinae Stach and Vasinyellinae nov.
Gordon, D.P.; Braga, G. (1994). Bryozoa: Living and fossil species of the catenicellid subfamilies Ditaxiporinae Stach and Vasinyellinae nov., in: Crosnier, A. Résultats des Campagnes MUSORSTOM 12. Mémoires du Muséum national d'Histoire naturelle. Série A, Zoologie, 161: pp. 55-85
In: Crosnier, A. (Ed.) (1994). Résultats des Campagnes MUSORSTOM 12. Mémoires du Muséum national d'Histoire naturelle. Série A, Zoologie, 161. Editions du Muséum: Paris. ISBN 2-85653-212-8. 569 pp.
In: Mémoires du Muséum national d'Histoire naturelle. Série A, Zoologie. Editions du Muséum: Paris. ISSN 0078-9747
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| Trefwoorden |
Fossils
Bryozoa [WoRMS]
Marien/Kust |
| Abstract |
The discovery of living species of the predominantly Tertiary catenicellid subfamily Ditaxiporinae on the Norfolk Ridge has necessitated a revision of the subfamily, which is characterised by biseriate multizooidal segments. The type species of the genera of Ditaxiporinae and of the related family Ditaxiporinidae were examined by scanning electron microscopy, leading to the recognition of six genera (two new) and 18 species (four new) and the incorporation of the Ditaxiporinidae into the Ditaxiporinae. The earliest occurring species is Caberoides rockallensis sp. nov. in the late Paleocene of the North Atlantic. There are only two living species - Bryosartor sutilis gen. et sp. nov. and Plagiopora recens Gordon, both on the northern Norfolk Ridge. A new monotypic genus, Ahcheethamia, is introduced for Caberoides corniculatus Cheetham from the British Eocene. With the exception of two species from North America, the subfamily is clustered in two centres of diversity - northwestern Europe and Australasia, the latter including Caberoides miranda sp. nov. and Plagiopora alma sp. nov., both newly recorded from the Eocene of New Zealand. Thus a Tethyan distribution of the subfamily was achieved relatively early in the Paleogene. Just as in other catenicellids, there seem to have been parallel trends in the Ditaxiporinae in the diversification of the frontal shield from a spinocyst to a perforated gymnocyst on the one hand and with cryptocystal elements (derived from expanded shallow pore-chambers) on the other. A unique development is indicated by the genus Vasignyella. Hitherto included in the family Savignyellidae, Vasignyella appears to have been derived from Ditaxiporina or a common ancestor by reduction to unizooidal segments and the loss of ovicells. A new subfamily of Catenicellidae, Vasignyellinae, is established for this genus. |
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