Order Opiliones: Harvestmen Harvestmen, often known as “daddy longlegs,” are common throughout the world and comprise about 5000 species. They […]
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Order Scorpiones: Scorpions Scorpions are perhaps the most ancient of terrestrial arthropods and comprise about 1400 species worldwide. Although scorpions
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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 About 1000 species of sea spiders occupy marine habitats ranging from shallow, coastal waters to deep-ocean
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Class Hirudinida is divided into three orders, Hirudinea, the “true” leeches, and two others that merit mention here because their
Class Oligochaeta More than 3000 species of oligochaetes are found in a great variety of sizes and habitats. They include
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Bivalvia are also known as Pelecypoda (pel-e-sip o-da), or “hatchet-footed” animals, as their name implies (Gr. pelekys, hatchet, pous, podos,
Cephalopoda (Gr. kephal¯e, head, + pous, podos, foot) include squids, octopuses, nautiluses, devilfish, and cuttlefish. All are marine, and all
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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