Thyasira undefined-1
- Dataset
- Mollusks (Gastropoda, Bivalvia) from Miocene cold-seep deposits in northern Italy: revisions and additions
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Mollusca
- class
- Bivalvia
- order
- Lucinida
- family
- Thyasiridae
- genus
- Thyasira
- species
- Thyasira undefined
description
Description Small, well-inflated, smooth, rounded-pentagonal shell, about as long as high, umbones elevated, blunt, slightly prosogyrate; posterior sulcus close to posterodorsal margin, deep, bordered distinct, roundtopped ridge; submarginal sulcus narrow; anterodorsal margin slightly concave
description
Fig. 9 A – B
discussion
Remarks The two species of Thyasira reported here are all small, poorly preserved, and represented by a single specimen each, making a robust identification difficult. They are placed in Thyasira due to their overall shape and size, and the presence of a shallow posterior sinus. Furthermore, Thyasira sp. 1 appears to have a submarginal sulcus. The two specimens differ in inflation and outline: Thyasira sp. 1 from Castiglione dei Pepoli is more globular than Thyasira sp. 2 from Casola; the latter is taller (it has a longer anterior margin) than Thyasira sp. 1.
distribution
Stratigraphic and geographic range Lower to Middle Miocene (Aquitanian to Langhian), northern Italy.
materials_examined
Material examined ITALY – Emilia-Romagna • 1 spec.; Castiglione dei Pepoli; MGGC 22311 (H = 12 mm).
Name
- Homonyms
- Thyasira undefined-2
- Thyasira undefined-1