Rotifers: Reproduction
Rotifers are dioecious, and males are usually smaller than females. However, despite having separate sexes, males are entirely unknown in […]
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Classes of Molluscs: Polyplacophora, Scaphopoda
Chitons (Gr. coat of mail, tunic) repreent a somewhat more diverse molluscan group with about 1000 currently described species. They
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Classes of Molluscs: Caudofoveata, Solenogastres
For more than 50 years five classes of living molluscs were recognized: Amphineura, Gastropoda, Scaphopoda, Bivalvia (also called Pelecypoda), and
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An Introduction to Molluscs
Mollusca (mol-lus’ ka) (L. molluscus, soft) is one of the largest animal phyla after Arthropoda. There are over 90,000 living
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Phylum Brachiopoda and Phylum Phoronida
Brachiopoda (brak-i-op’ – o-da) (Gr. brachio¯n, arm, pous, podos, foot), or lamp shells, are an ancient group. Although about 325
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Molluscs: Form and Function
The enormous variety, great beauty, and easy availability of shells of molluscs have made shell collecting a popular pastime. However,
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Phylum Ectoprocta (Bryozoa)
Ectoprocta (ek-to-prok’ – ta) (Gr. ektos, outside, + proktos, anus) contains aquatic animals that often encrust hard surfaces. Most species
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Phylum Acanthocephala: Form and Function
Members of phylum Acanthocephala (a-kan’ -tho-sef ‘-a-la) (Gr.akantha, spine or thorn, + kephale¯, head) are commonly called “spiny-headed worms.” The
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Lophophorates: An Introduction
The final three phyla in this chapter are the most controversial taxa placed within Protostomia. Evidence that Ectoprocta, Brachiopoda, and
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Phylum Entoprocta
Entoprocta (en’ – to-prok ‘-ta) (Gr. entos, within, + proktos, anus) is a small phylum of about 150 species of