Ozopore

An ozopore is the opening of a defensive gland present in some arthropods, notably in millipedes of the order Polydesmida[1] and in harvestmen, the eight-legged arachnids also known as "daddy long-legs".

The name is derived from Ancient Greek ozo "smell" and Latin porus "pore, small opening".

In the Eupnoi, the Sclerosomatidae secrete short-chain acyclic ketones and alcohols, and the Phalangiidae, naphthoquinones.

[2] In millipedes, ozopores are repeated serially on body segments, and usually situated laterally.

Exceptions are members of the order Glomerida, which have ozopores located dorsally.