World Patterns of Air Temperature
Surface type (urban or rural), elevation, latitude, daily and annual insolation cycles, and location (maritime or continental) all can influence...
BioBlogs
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...
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...
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 “hatchet-footed” 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...
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...
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...
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...
Major Groups of Gastropods
Traditional classification of class Gastropoda recognizes three sub classes: Prosobranchia, the largest subclass, almost all of which are marine; Opisthobranchia,...
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,...
Dividing the Body among Animals
Although a fluid-filled coelom provided an efficient hydrostatic skeleton for burrowing, precise control of body movements was probably difficult for...
