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Daughter taxa (time control age-window is: 0-800Ma)![]() | Granddaughter taxa | ||||
| Velatachitina claviform chamber enveloped within a membranous sleeve. | |||||
Catalog entries: Velatachitininae
Original description: Diagnosis: Conochitinidae characterized by an outer layer clearly separated from the inner wall of the vesicle. The outer layer covers the entire chamber and sometimes the neck and forms a sleeve that can extend beyond the basal margin.
Distinguishing features:
Parent taxon (Conochitinidae): flexure inconspicuous
This taxon: sleeve
Geological Range:
Last occurrence (top): at top of Middle Ordovician Epoch (100% up, 458.2Ma, in Darriwilian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Early Ordovician Epoch (471.26-486.85Ma, base in Tremadocian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
NB The ranges given for genera and higher taxa are the total ranges of species included in that taxon in this database - so the true total range of the taxon will usually be longer
Achab, A., Asselin, E. & Soufiane, A. (1993). New morphological characters observed in the Order Operculatifera and their implications for the suprageneric Chitinozoan classification. Palynology. 17: 1-9. gs Poumot, C. L. (1968). Amphorachitina, Ollachitina, Velatachitina, trois nouveaux genres de Chitinozoaires de l ‘Erg oriental (Algérie-Tunisie). Bulletin du Centre de Recherche de Pau. 2(1): 45-55. gsReferences:

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Velatachitininae compiled by the Sonia Camino, viewed: 14-6-2026
Short stable page link: https://mikrotax.org/Chitinotax/index.php?id=160021 Go to Archive.is to create a permanent copy of this page - citation notes |