Palaeoheterodonta
Palaeoheterodonta (phylum Mollusca, class Bivalvia) A subclass of equivalve bivalves which have prismatic-nacreous, aragonitic shells, and a small number of teeth that diverge from the umbo. The external ligament is opisthodetic or amphidetic, and parivincular. The hinge plate is present in some forms, and the musculature is variable. The subclass first appeared in the Middle Cambrian, and contains one extinct and two extant orders.
More From encyclopedia.com
Rhynchonellids , Rhynchonellida (rhynchonellids; class Articulata) Order of brachiopods (Brachiopoda), with rostrate shells, a functional pedicle, and a delthyrium pa… Middle Class , middle class. The middle class has been an influential and often enigmatic presence in British history since the early 19th cent. It first gained sus… Articulata , Articulata
1. (phylum Brachiopoda) A class of brachiopods in which the calcareous valves are impunctate, punctate, or pseudo-punctate. The fibrous or… Cryptodonta , Cryptodonta (phylum Mollusca, class Bivalvia) A subclass of bivalves most of which have thin, equivalve shells composed of aragonite. They have an am… Soft Corals , Alcyonacea (soft corals; class Anthozoa, subclass Octocorallia) An order of corals that appeared first in the Lower Jurassic and which contains the m… Petty Bourgeoisie , Bourgeoisie, Petty
The term petty bourgeoisie originally referred to the class of people involved in small-scale commercial enterprises who owned the…
You Might Also Like
NEARBY TERMS
Palaeoheterodonta