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Pediculosis pubis (also known as "crabs" and "pubic lice") is an infestation by the pubic louse, Pthirus pubis, a wingless insect which feeds on blood and lays its eggs (nits) on mainly pubic hair. Less commonly, hair near the anus, armpit, beard, eyebrows, moustache, and eyelashes may be involved.
Crab louse infestations are usually spread through sexual contact and are most common in adults. [15] [3] [4] The crab louse can travel up to 25 cm (10 in) on the body. Crab louse infestation is found worldwide and occurs in all races and ethnic groups and in all socio-economic levels. Occasionally they may be also transmitted by close personal ...
Cryptochiridae is a family of crabs known commonly as gall crabs or coral gall crabs. They live inside dwellings in corals and cause the formation of galls in the coral structure. [1] [2] The family is currently placed in its own superfamily, Cryptochiroidea. Gall crabs are sexually dimorphic, with males being much smaller than females ...
These crabs are well known for their extreme sexual dimorphism, where the male crabs have a major claw significantly larger than their minor claw, whilst females claws are both the same size. [3] The name fiddler crab comes from the appearance of their small and large claw together, looking similar to a fiddle.
Crabs often show marked sexual dimorphism. Males often have larger claws, [12] a tendency that is particularly pronounced in the fiddler crabs of the genus Uca . In fiddler crabs, males have one greatly enlarged claw used for communication, particularly for attracting a mate. [13]
Horseshoe crabs are arthropods of the family Limulidae and are the ... This phenomenon is known as sexual size dimorphism and results in the females having a ...
U. cordatus is one of many animals that have sexual dimorphism. Most noticeably, female crabs are larger than their male counter parts. [1] Males have a flatter oval shaped back with a distinct light blue in the middle with a beige white encompassing its back. On the other hand, females have much larger bulbous backs.
The Red Devil Vampire crabs are sexually dimorphic and males have a narrow and slimmer plate while females have a broad plate on their belly and they might also be carrying around some fertilized eggs. Another difference between male and female crabs is in their claws: males have larger and brighter claws while females have smaller claws.