haematodocha

English

Noun

haematodocha (plural haematodochae)

1. (zoology) An elastic sac of tissue within the palp of male arachnids, which fills with blood during insemination.
   • 1996, Michael J Roberts, Spiders of Britain and Northern Europe, Collins, published 1996, page 22:

     The elastic haematodochae are then distended hydraulically, pushing out and rotating the sclerites of the palpal organs, some of which lock it in position.