C. L. Koch, 1841
Phrynus marginemaculatus is a species of amblypygid which is found in tropical and subtropical climates in North America and the Caribbean. They are nocturnal animals, and during the day they hide in small humid places where they are hard to spot.
The body of Phrynus marginemaculatus can measure up to 18 millimetres (0.71 in) long, but its front legs can reach 100 millimetres (3.9 in) long. It has eight pairs of legs with six used for walking and the first employed as sensory organs for detecting prey and moving at night. Its cephalothorax is wider than it is long and is outfitted with eight eyes. One pair of eyes is located in front and 3 more pairs on the sides. They have no fangs, but instead have arm-likepedipalps and a pair of smaller chelicerae for chewing.
They use their 3 pairs of ambulatory legs to move sideways as a crab would and use 1 pair for sensory purposes only. Also, to feed on their prey, they capture them using the huge, arm-like pedipalps then chew the prey using small, claw-like chelicerae. They are known to be one of the few species of arachnids that show social behavior. They take care of their young by walking in groups with them and comforting them with their legs.
To reproduce, the male P. marginemaculatus courts the female with his long front pair of legs. He puts a sperm packet into the female by guiding her over him using his front legs. She then places it inside her sex duct. After a few weeks to a few months she exudes a brood sac containing from 12 to 20 eggs. These develop over a three-month period, and after hatching the female will then carry the first instars on her back for about ten days until they molt. Afterwards the female can watch over her young for another nine months as they grow. About two years is needed for young to reach adulthood and then another two to three years can be expected from the adult.
- Diomedes Quintero, Jr. (1981). "The amblypygid genus Phrynus in the Americas (Amblypygi, Phrynidae)" (PDF). Journal of Arachnology 9: 117–166.