Chitinotax - ct_main - Velatachitininae Chitinotax - ct_main - Velatachitininae

Velatachitininae

NB This site is under active development


Classification: ct_main -> Conochitinidae -> Velatachitininae
Sister taxa: Conochitininae, Velatachitininae, Eremochitininae, Tanuchitininae, Pogonochitininae, Belonechitininae, Spinachitininae
Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Velatachitina
claviform chamber enveloped within a membranous sleeve.
Velatachitina copulata
Velatachitina nebulosa
Velatachitina veligera
Velatachitina sp.

Taxonomy

Citation: Velatachitininae Achab, Asselin & Soufiane, 1993
Taxonomic rank: subfamily
Basionym: Velatachitininae Achab, Asselin & Soufiane, 1993
Type species: Genus Velatachitina Poumot, 1968

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

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

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

References:

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. gs


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Velatachitininae compiled by the Sonia Camino, viewed: 14-6-2026

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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



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