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Spider enjoying a meal


Spider enjoying a meal
Photo Information
Copyright: Michael Porterfield (mporterf) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 60 W: 74 N: 84] (673)
Genre: Animals
Medium: Color
Date Taken: 2005-08
Categories: Spiders
Camera: Nikon Coolpix 5700
Photo Version: Original Version
Theme(s): Insects / Spiders [view contributor(s)]
Date Submitted: 2006-11-30 12:00
Viewed: 4368
Points: 0
[Note Guidelines] Photographer's Note
The arachnids, are a class (Arachnida) of joint-legged invertebrate animals in the subphylum Chelicerata. Arachnids are named after the mythological figure Arachne. They are chiefly terrestrial arthropods, comprising some 65,000 to 73,000 named species including spiders, scorpions, harvestmen, ticks, and mites.

Arachnids may be easily distinguished from insects by the fact that arachnids have eight legs whereas insects have six. The chelicerae serve to macerate food particles. The first post-oral pair of appendages —pedipalps (leg-like mouthparts) — of some species have been adapted for sensory, prey capture or reproductive functions. In Solifugae, the palpi are quite leg-like and make Solifugae appear to have ten legs. The larvae of mites have only six legs; the fourth pair appears when they moult into nymphs. Arachnids are further distinguished by the fact they have no antennae and no wings. They have a two-segmented body, made up of a cephalothorax and an abdomen, the cephalothorax being derived from the fusion of the cephalon (head) and the thorax.

Arachnids are mostly carnivorous, feeding on the pre-digested bodies of insects and other small animals. Many are venomous - they secrete poison from specialized glands to kill prey or enemies. Others are parasites, some of which are carriers of disease. Arachnids usually lay eggs, which hatch into immature adults.


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