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Any living creature of the Kingdom Animalia constituting multi-celled organisms as well as single-celled organisms lacking chlorophyll and having the ability for spontaneous movement, such as protozoans.

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Animals > Spiders


Animals; Spiders

The loss of appendages by breaking them at a predetermined locus of weakness when pulled by an outside form; frequent in spiders and arachnids.


Animals; Spiders

The act of reflex self-mutilation by dropping appendages; unknown in the arachnids.


Animals; Spiders

Aeronautical dispersal by means of air currents acting on strands of silk.

book lung

Animals; Spiders

An air-filled cavity, containing stacks of blood-filled leaves, opening on the underside of the abdomen.

book lungs

Animals; Spiders

The respiratory pouches of the arachnids, filled with closely packed sheets or folds to provide maximum surface for aeration; believed to be modified, insunk gills.

branchial operculum

Animals; Spiders

A sclerotized, hairless plate overlying the book lung.


Animals; Spiders

A comb-like series of hairs on metatarsus IV of cribellate spiders