palpigrade

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Chart titled Diversity of arachnids comparing a Silurian fossil scorpion and 11 living groups, including spiders, scorpions, mites, daddy longlegs, sunspiders, whip scorpions, and false scorpions. Illustrations show their varied forms and typical size ranges from 0.1 millimeters to 210 millimeters; fossil anatomy labels identify pincers, pedipalps, legs, and body sections.

palpigrade

arachnid order

Also known as: Palpigradi, micro-whip scorpion

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arachnid
Annotated classification
Order Palpigradi (micro whip scorpions) 70 mainly tropical species. Size 0.8–2.6 mm; carapace subdivided into 3 parts; eyes absent; 3-jointed leglike pedipalps; long, thin, and multisegmented “tail” (telson); no book lungs or tracheae. Order Ricinulei (ricinuleids) 30 primarily tropical species. Size 8–10
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Order Palpigradi (micro whip scorpions) 70 mainly tropical species. Size 0.8–2.6 mm; carapace subdivided into 3 parts; eyes absent; 3-jointed leglike pedipalps; long, thin, and multisegmented “tail” (telson); no book lungs or tracheae. Order Ricinulei (ricinuleids) 30 primarily tropical species. Size 8–10
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arachnid
Body and appendages
…and micro whip scorpions (order Palpigradi) have long whiplike structures of unknown function.
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…and micro whip scorpions (order Palpigradi) have long whiplike structures of unknown function.
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