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Difference between the pedipalps of male (right) and female (left) horseshoe crabs. Pedipalps are highlighted in grey. The opisthosoma or abdomen of a horseshoe crab is composed of several fused segments. [25]: 556 Similar to a trilobite, the abdomen is made up of three lobes: a medial lobe in the middle, and a pleural lobe on either side. [27]
The crabs communicate with one another through chemical, visual, and acoustic cues. [8] The male then carries the female for thirty days in a precopulatory position under his body until the female molts. [7] [9] When the female's shell is still soft the male will invert her to position themselves with their abdomens in contact together. [7]
The Atlantic horseshoe crab (Limulus polyphemus), also known as the American horseshoe crab, is a species of horseshoe crab, a kind of marine and brackish chelicerate arthropod. [1] It is found in the Gulf of Mexico and along the Atlantic coast of North America. [1] The main area of annual migration is Delaware Bay along the South Jersey ...
The fiddler crab or calling crab may be any of more than one hundred species of semiterrestrial marine crabs in the family Ocypodidae, [2] well known for their sexually dimorphic claws; the males' major claw is much larger than the minor claw, while the females' claws are both the same size. [3] A smaller number of ghost crab and mangrove crab ...
In general, the healthiest fish and shellfish are: High in omega-3 fatty acids. High in protein. Low in mercury. Sustainable. The healthiest seafood choices are very high in omega-3s, says Patton ...
C. sapidus is a decapod crab of the swimming crab family Portunidae. The genus Callinectes is distinguished from other portunid crabs by the lack of an internal cartilaginous spine on the carpus (the middle segment of the claw), as well as by the T-shape of the male abdomen. [6] Blue crabs may grow to a carapace width of 23 cm (9 in).
Tachypleus tridentatus, commonly known as the Chinese horseshoe crab, Japanese horseshoe crab, or tri-spine horseshoe crab, is a species of horseshoe crab found in Southeast and East Asia, with records from China, Indonesia, Japan, South Korea, Malaysia, the Philippines, Taiwan, and Vietnam. [ 1][ 3] It is found in coastal marine and brackish ...
The underside of a male (top) and a female (bottom) individual of Pachygrapsus marmoratus, showing the difference in shape of the abdomen. 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 (Ocypodidae).