Pentamerida is an order of biconvex, impunctate shelled, articulate brachiopods that are found in marine sedimentary rocks that range from the Middle Cambrian through the Devonian.[1]
Pentamerids are characterized by a short hinge line where the two valves articulate, inner areas above the hinge line that slope inwardly from the beak of each valve, and a well-developed spondylium on the pedicle valve. The spondylium is a raised platform for muscle attachment found in the middle of the interior pedicle valve, generally toward the hinge and beak. The pedicle valve is the one that the pedicle, or hold-fast stalk, attaches to.[1] The brachidia, which hold the lophophore, the ciliated feeding arms, are looped, as in the Orthida.
The Short hinge line helps distinguish the pentamerids from the ancestral orthids from which they are obviously derived.[1] The hinge line is not as short as found in the Rhynchonellida or Athyridida.
In the older classification of Moore, Lalicker and Fischer, 1952, the Pentamerida was regarded as simply an order in the Class Articulata and divided into two suborders, the Syntrophiacea and the Pentameracea, presented with superfamily endings of the time. The treatise on Invertebrate Paleontology, Part H Brachiopida (revised)[2] now places the Order Pentamerida in the Class Rhynchonellata and divides it into the suborders Syntrophiidina and Pentameridina. The Syntrophiidina are the more primitive of the two.
Referencesedit
^ abcMoore, Lalcker and Fischer, 1952, Invertebrate Fossils, McGraw-Hill
pentamerida, order, biconvex, impunctate, shelled, articulate, brachiopods, that, found, marine, sedimentary, rocks, that, range, from, middle, cambrian, through, devonian, temporal, range, cambrian, upper, devonian, preꞒ, pentamerus, internal, mold, silurian,. Pentamerida is an order of biconvex impunctate shelled articulate brachiopods that are found in marine sedimentary rocks that range from the Middle Cambrian through the Devonian 1 PentameridaTemporal range Mid Cambrian Upper Devonian PreꞒ Ꞓ O S D C P T J K Pg N Pentamerus internal mold Silurian Scientific classification Domain Eukaryota Kingdom Animalia Phylum Brachiopoda Class Rhynchonellata Order PentameridaSchuchert and Cooper 1931 Suborders Pentameridina Syntrophiidina Pentamerids are characterized by a short hinge line where the two valves articulate inner areas above the hinge line that slope inwardly from the beak of each valve and a well developed spondylium on the pedicle valve The spondylium is a raised platform for muscle attachment found in the middle of the interior pedicle valve generally toward the hinge and beak The pedicle valve is the one that the pedicle or hold fast stalk attaches to 1 The brachidia which hold the lophophore the ciliated feeding arms are looped as in the Orthida The Short hinge line helps distinguish the pentamerids from the ancestral orthids from which they are obviously derived 1 The hinge line is not as short as found in the Rhynchonellida or Athyridida In the older classification of Moore Lalicker and Fischer 1952 the Pentamerida was regarded as simply an order in the Class Articulata and divided into two suborders the Syntrophiacea and the Pentameracea presented with superfamily endings of the time The treatise on Invertebrate Paleontology Part H Brachiopida revised 2 now places the Order Pentamerida in the Class Rhynchonellata and divides it into the suborders Syntrophiidina and Pentameridina The Syntrophiidina are the more primitive of the two References edit a b c Moore Lalcker and Fischer 1952 Invertebrate Fossils McGraw Hill Classification des Brachiopoda The Paleobioloy Database Pentamerida entry nbsp This brachiopod related article is a stub You can help Wikipedia by expanding it vte nbsp This prehistoric protostome article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Pentamerida amp oldid 1186485484, wikipedia, wiki, book, books, library,
