Strophomena

Strophomena

▪ fossil genus
      genus of extinct brachiopods (lamp shells) found as fossils in Middle and Upper Ordovician marine rocks (those ranging in age from 438 million to 478 million years old). The shell consists of two parts, or valves, dissimilar in shape—one strongly convex, the other concave. A distinctive laminated pattern occurs at the margins of the shell, along with fine, arcuate (bowlike) growth lines. Strophomena is representative of an important group of fossil brachiopods, the strophomenids.

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Look at other dictionaries:

  • Strophomĕna — Strophomĕna, so v.w. Productus …   Pierer's Universal-Lexikon

  • strophomena — stroph·o·me·na …   English syllables

  • strophomena — ˌsträfəˈmēnə noun Usage: capitalized Etymology: New Latin, irregular from Greek strophōma hinge (akin to Greek strephein to turn) + mēnē moon; from its hinge and concavo convex shell more at strophe, moon : a genus (the type of the family… …   Useful english dictionary

  • strophomenidae — ˈmenəˌdē noun plural Usage: capitalized Etymology: New Latin, from Strophomena, type genus + idae : a family of Ordovician to Permian brachiopods that are usually isolated in a distinct superfamily or suborder of Telotremata but are sometimes… …   Useful english dictionary

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  • Llandeilo Group — In geology, the Llandeilo Group is the middle subdivision of the British Ordovician rocks. It was first described and named by Sir R. I. Murchison from the neighborhood of Llandeilo in Carmarthenshire. In the type area it consists of a series of… …   Wikipedia

  • List of brachiopod genera — Taxobox name = Brachiopoda fossil range = Cambrian Recent image width = 250px image caption = Rhynchotella inconstans lived some 155 150 million years ago (mya) regnum = Animalia phylum = Brachiopoda phylum authority = Duméril, 1806 subdivision… …   Wikipedia

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