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Entomostraca is a historical subclass of crustaceans , no longer in technical use. It was originally considered one of the two major lineages of crustaceans the other being the class Malacostraca , combining all other classes— Branchiopoda , Cephalocarida , Ostracoda , Copepoda and Maxillopoda. The Ostracoda have the body enclosed in a bivalve shell-covering, and are normally unsegmented. The Branchiopoda have a very variable number of body-segments, with or without a shield, simple or bivalved, and some of the post-oral appendages normally branchial.

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Entomostraca is a historical subclass of crustaceans , no longer in technical use. It was originally considered one of the two major lineages of crustaceans the other being the class Malacostraca , combining all other classes— Branchiopoda , Cephalocarida , Ostracoda , Copepoda and Maxillopoda.

The Ostracoda have the body enclosed in a bivalve shell-covering, and are normally unsegmented. The Branchiopoda have a very variable number of body-segments, with or without a shield, simple or bivalved, and some of the post-oral appendages normally branchial. The Copepoda normally have a segmented body, not enclosed in a bi-valved shell-covering, fewer than twelve segments, the limbs not branchial. From Wikipedia, the free encyclopedia. Categories : Obsolete arthropod taxa Crustacean taxonomy Arthropod subclasses Crustacean stubs.

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Inventario y catálogo de ostrácodos recientes de los mares mexicanos

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Entomostraca

Ostracods , or ostracodes, are a class of the Crustacea class Ostracoda , sometimes known as seed shrimp. Some 70, species only 13, of which are extant have been identified, [1] grouped into several orders. Their bodies are flattened from side to side and protected by a bivalve -like, chitinous or calcareous valve or "shell". The hinge of the two valves is in the upper dorsal region of the body. Ostracods are grouped together based on gross morphology. While early work indicated the group may not be monophyletic ; [2] and early molecular phylogeny was ambiguous on this front, [3] recent combined analyses of molecular and morphological data found support for monophyly in analyses with broadest taxon sampling. Ecologically, marine ostracods can be part of the zooplankton or most commonly are part of the benthos , living on or inside the upper layer of the sea floor.

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