A new species and genus of Lower Jurassic rhynchonellide (Brachiopoda) from Livari (Rumija Mountain, Montenegro): taxonomic implications of the shell microstructure

Објеката

Тип

Рад у часопису

Верзија рада

објављена верзија

Језик

енглески

Креатор

Barbara V. Radulović, Michael R. Sandy, Peter Schaaf

Извор

Historical Biology

Датум издавања

2024

Сажетак

A new rhynchonellide brachiopod genus and species, Skadarirhynchia semicostata gen. et sp. nov., is described from the late Pliensbachian of Livari, Rumija Mountain, southeastern Montenegro. It occurs in shallow-water brachiopod-crinoid packstone beds (bioclastic limestones) of the periplatform facies of the Dinaric Carbonate Platform. Stratigraphy is constrained by means of 87Sr/86Sr dating indicating a late Pliensbachian age, and by the fact that the brachiopod beds lie immediately below the Toarcian marly limestones, which is consistent with the regional stratigraphical position. The new species has a circular to roundly pentagonal outline and semicostate shells with 10‒12 strong angular ribs. Internally, it shows reduced dental plates, narrow and thin hinge plates inclined dorsally with small crural bases, crescent-like and laterally convex, and hamiform crura. The shell microstructure of the new taxon is characterised by a homogeneous secondary layer (a single layer with no sublayers) built of rhombic fibres that are typically of coarse-fibrous type (eurinoid pattern) 35‒50 μm wide and 20‒30 μm thick. Other co-occurring rhynchonellide species such as Prionorhynchia fraasi and Cuneirhynchia dalmasi are also described. Shell microstructures for the genus Cuneirhynchia are presented.

doi

10.1080/08912963.2024.2403595

issn

1029-2381

Subject

brachiopods, liassic, skadarirhynchia, prionorhynchia, cuneirhynchia, Dinaric carbonate platform

Шира категорија рада

M20

Ужа категорија рада

М22

Права

Отворени приступ

Лиценца

All rights reserved

Формат

.pdf

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Барбара Радуловић

Radovi istraživača

Медија

Radulovic et al. Skadarirhynchia 2024.pdf

Barbara V. Radulović, Michael R. Sandy, Peter Schaaf. "A new species and genus of Lower Jurassic rhynchonellide (Brachiopoda) from Livari (Rumija Mountain, Montenegro): taxonomic implications of the shell microstructure" in Historical Biology (2024). https://doi.org/10.1080/08912963.2024.2403595

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