Phylogeny and Diversification in Mollusc
The first molluscs probably arose during Precambrian times because fossils attributed to Mollusca have been found in geological strata as […]
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October 2024
An Introduction to Class Oligochaeta
Class Oligochaeta More than 3000 species of oligochaetes are found in a great variety of sizes and habitats. They include
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Clouds and Fog
Images of the Earth from space show that about half of our planet is blanketed in clouds. Clouds play a
Class Bivalvia
Bivalvia are also known as Pelecypoda (pel-e-sip o-da), or âhatchet-footedâ animals, as their name implies (Gr. pelekys, hatchet, pous, podos,
Class Cephalopods
Cephalopoda (Gr. kephal¯e, head, + pous, podos, foot) include squids, octopuses, nautiluses, devilfish, and cuttlefish. All are marine, and all
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Representative Polychaetes: Common Worms
Clam Worms: Nereis Clam worms, or sand worms as they are sometimes called, are errant polychaetes that live in mucous-lined
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An Introduction to Class Polychaeta
The largest class of annelids is the Polychaeta (Gr. polys, many, chaite¯, long hair) with more than 10,000 species, most
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Gastropoda: Internal Form and Functions
Respiration in most gastropods is performed by a ctenidium (two ctenidia is the primitive condition, found in some prosobranchs) located
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Major Groups of Gastropods
Traditional classification of class Gastropoda recognizes three sub classes: Prosobranchia, the largest subclass, almost all of which are marine; Opisthobranchia,
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An Introduction to Phylum Annelida
Phylum Annelida (an-neli-da) (L. annelus, little ring, ida, pl.suffi x) consists of the segmented worms. It is a diverse phylum,
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