Subphylum Myriapoda
SUBPHYLUM MYRIAPODA The term “myriapod,” meaning “many footed,” describes members of four classes in subphylum Myriapoda that have evolved a […]
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Class Arachnida (Harvestmen, Ticks and Mites)
Order Opiliones: Harvestmen Harvestmen, often known as “daddy longlegs,” are common throughout the world and comprise about 5000 species. They
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Class Arachnida (Scorpions)
Order Scorpiones: Scorpions Scorpions are perhaps the most ancient of terrestrial arthropods and comprise about 1400 species worldwide. Although scorpions
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Class Arachnida (Spiders)
Arachnids (Gr. arachne¯, spider) exhibit enormous anatomical variation. In addition to spiders, the group includes scorpions, pseudoscorpions, whip scorpions, ticks,
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Class Pycnogonida: Sea Spiders
Class Pycnogonida: Sea Spiders About 1000 species of sea spiders occupy marine habitats ranging from shallow, coastal waters to deep-ocean
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Class Hirudinida
Class Hirudinida is divided into three orders, Hirudinea, the “true” leeches, and two others that merit mention here because their
Phylum Sipuncula
Phylum Sipuncula (sigh-pun + kyu-la) (L. sipunculus, little siphon) consists of about 250 species of benthic marine worms, at depths
Phylum Echiura
Phylum Echiura (ek-ee-yur a) (Gr. echis, viper, serpent, oura tail, ida, pl. suffix) consists of about 140 species of marine worms
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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