Pholadina (class Bivalvia, order Myoida) A suborder of thin-shelled, unequilateral bivalves, which differ from other members of the order in possessing one or more additional plates. The foot is circular and acts as a suction disc. A small internal ligament and chondrophore are present. There are no hinge teeth. Musculature is isomyarian. The gills are elongate, with a pair of demibranchs in most forms. Pholadina live in holes that they bore, commonly on a rock, coral, or wood substrate. They first appear in rocks of Jurassic age.
More From encyclopedia.com
Iron Ores , Rocks Rocks are composed of minerals, which are natural inorganic (nonliving) substances with specific chemical compositions and structures. A rock m… Rock , rock1 / räk/ • n. 1. the solid mineral material forming part of the surface of the earth and other similar planets, exposed on the surface or underly… Igneous Rocks , Igneous rocks are formed by the cooling and hardening of molten magma. The word igneous comes from the Latin word igneus, meaning fire, and there are… Country Rock , Country rock The term country rock refers to a body of rock that receives or hosts an intrusion of a viscous geologic material. Intrusions into count… Metamorphic Rocks , Metamorphic rock is rock that has changed from one type of rock into another. The word metamorphic (from Greek) means “of changing form.” Metamorphic… Aphanitic , Aphanitic Crystalline rocks with mineral grains that cannot be distinguished from one another without magnification have an aphanitic igneous texture…
About this article
Updated About encyclopedia.com content Print Article
You Might Also Like