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
Representative Polychaetes: Common Worms Read More »
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
An Introduction to Class Polychaeta Read More »
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
Gastropoda: Internal Form and Functions Read More »
Major Groups of Gastropods
Traditional classification of class Gastropoda recognizes three sub classes: Prosobranchia, the largest subclass, almost all of which are marine; Opisthobranchia,
Major Groups of Gastropods Read More »
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,
An Introduction to Phylum Annelida Read More »
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
Dividing the Body among Animals Read More »
Gastropoda: Feeding Habits
Feeding habits of gastropods are as varied as their shapes and habitats, but all include use of some adaptation of
Gastropoda: Feeding Habits Read More »
Gastropoda: Torsion and Coiling
Torsion Gastropod development varies with the particular group under discussion, but in general there is a trochophore larval stage followed
Gastropoda: Torsion and Coiling Read More »