Apophysis (spider)

This glossary describes the terms used in formal descriptions of spiders; where applicable these terms are used in describing other arachnids.

Abdomen or opisthosoma: One of the two main body parts (tagmata), located towards the posterior end; see also Abdomen: Other animals

Anal tubercle: A small protuberance (tubercule) above the spinnerets through which the anus opens

Apophysis (plural apophyses): An outgrowth or process changing the general shape of a body part, particularly the appendages; often used in describing the male pedipalp

Atrium (plural atria): An internal chamber at the entrance to the copulation duct in female haplogyne spiders

Bidentate: Having two teeth

Book lungs: Respiratory organs on the ventral side (underside) of the abdomen, in front of the epigastric furrow, opening through narrow slits; see also Book lungs

Bulbus → palpal bulb

Calamistrum (plural calamistra): Modified setae (bristles) on the metatarsus of the fourth leg of spiders with a cribellum, arranged in one or more rows or in an oval shape, used to comb silk produced by the cribellum; see also Calamistrum

Caput (plural capita): → cephalic region

Carapace: A hardened plate (sclerite) covering the upper (dorsal) portion of the cephalothorax; see also Carapace

Carpoblem: The principal tibial apophysis on the male pedipalp; also just called the tibial apophysis

Cephalic region: The front part of the cephalothorax, separated from the thoracic region by the cervical groove

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