Biodiversity & Evolution

Posts tagged “arachnid

The truth about daddy longlegs

The arachnid order Opiliones has several common names in English including daddy longlegs, grand daddy longlegs and harvestmen.  I have many wonderful things to share with you regarding the natural history of Opiliones so I’m going to post it in a series of about five posts. Here is the first fun fact to whet your appetite.  Keep an eye out for the others very soon!

Longlegs fact #1: Daddy longlegs are NOT spiders.

They are also not insects.  So what are they?  Well, I’m glad you asked.  Daddy longlegs are arachnids belonging to the order Opiliones.  The subclass Arachnida includes spiders, scorpions, mites/ticks, daddy longlegs, and several smaller groups, all of which belong to different orders.  So daddy longlegs are distantly related to spiders, but are actually more closely related to scorpions!

These incredible arachnids are easily overlooked, as they are most active at night and many species are very secretive in their behavior.  Here’s a few examples of species from Costa Rica:

Prionostemma sp. feasting upon what remains of an insect

Cynorta marginalis eating an earthworm as a second individual sneaks up.

Poecilaemula signata (male) with enlarged chelicerae

The orange harvestman, an undescribed species

For more arachnid photos see my Arachnid gallery.