Class Arachnida (Spiders)
Arachnids (Gr. arachne¯, spider) exhibit enormous anatomical variation. In addition to spiders, the group includes scorpions, pseudoscorpions, whip scorpions, ticks, […]
Class Arachnida (Spiders) Read More »
October 2024
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
Class Pycnogonida: Sea Spiders Read More »
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
Ascaris Lumbricoides
Because of its size and availability, Ascaris (Gr. askaris, intestinal worm) is usually selected as a type for study in
Ascaris Lumbricoides Read More »
The Hydrologic Cycle
The hydrologic cycle, or water cycle, moves water from land and ocean to the atmosphere. Water from the oceans and
The Hydrologic Cycle Read More »
Humidity of the Atmosphere
Blistering summer heat waves can be deadly, with the elderly and the ill at greatest risk. However, in such weather,
Humidity of the Atmosphere Read More »
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
Roundworms in Nematoda Read More »
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
World Patterns of Air Temperature Read More »
