Species
Conochitina rugata Nõlvak, 2007
Taxon description
Nõlvak, 2007a
The vesicle is cylindrical, with straight to slightly convex flanks and tapers towards the aperture. Shoulders and flexure are absent or very weakly developed and the neck, if present, is about 1/3 of the total length of the vesicle. The maximum width is just above the rounded aboral margin. The ridges, sometimes anastomosing, are well developed longitudinally over the whole vesicle. However, the inner surface of the vesicle wall is glabrous. The convex base, provided with a pronounced copula, has also a weak ornamentation.
Type specimen data
holotype : Department of Geology, TalTech GIT 190-8 , Põltsamaa H-39 borehole , Pirgu Stage , core depth 125 m
Synonymy list
2007 Conochitina rugata sp. n. — Nõlvak , pp. 63-64 , fig. 1a-c
Selection of related publications
Hints, O., Ainsaar, L., Lepland, A., Liiv, M., Männik, P., Meidla, T., Nõlvak, J., Radzevičius, S. 2023. Paired carbon isotope chemostratigraphy across the Ordovician–Silurian boundary in central East Baltic: Regional and global signatures. Palaeogeography, Palaeoclimatology, Palaeoecology 624, 1-17. DOI:10.1016/j.palaeo.2023.111640
Nõlvak, J. 2010. Distribution of Ordovician chitinozoans. Estonian Geological Sections Bulletin 10, 17-18.
Kaljo, D., Hints, L., Männik, P., Nõlvak, J. 2008. The succession of Hirnantian events based on data from Baltica: brachiopods, chitinozoans, conodonts, and carbon isotopes. Estonian Journal of Earth Sciences 57, 4, 197-218. DOI:10.3176/earth.2008.4.01
Nõlvak, J. 2007. A new chitinozoan species from the Upper Ordovician of the East Baltic. Estonian Journal of Earth Sciences 56, 1, 63-64.
Occurrence in samples (CONOP)
Männamaa F-367 borehole : 1 sample(s)
Orjaku borehole : 4 sample(s)
Ristiküla 174 borehole : 2 sample(s)
Valga 10 borehole : 5 sample(s)
Tartu 453 borehole : 9 sample(s)
Viki borehole : 3 sample(s)
Viljandi 91 borehole : 1 sample(s)
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Classification
References based on distribution
- Nõlvak, 2010a Viki borehole Pirgu Stage
- Nõlvak, 2007a Põltsamaa H-39 borehole Pirgu Stage