Humidity of the Atmosphere
Blistering summer heat waves can be deadly, with the elderly and the ill at greatest risk. However, in such weather, […]
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Roundworms in Nematoda
Approximately 25,000 species of Nematoda (nem-a-to´da) (Gr., nematos, thread) have been named, but many authorities now prefer Nemata for the
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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
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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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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 “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
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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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