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The largest females of the tri-spine horseshoe crab can be as much as 79.5 cm (31.3 in) long, including their tail. [9] On average in Sabah , Malaysia, females are about 66.5 cm (26.2 in) long, including a tail that is about 34.5 cm (13.6 in), and their carapace (prosoma) is about 31 cm (12 in) wide.
The decapod (crustaceans, such as a crab, lobster, shrimp or prawn) is made up of 20 body segments grouped into two main body parts: the cephalothorax and the pleon . [1] [2] Each segment may possess one pair of appendages, although in various groups these may be reduced or missing. They are, from head to tail:
The claws are smooth, purplish gray, with a single row of nodules along the outer edge, and blunt claw tips. The legs are covered with numerous short spines and nodules. It is the largest native crab species of the Atlantic. It can reach up to 3 kg of weight and a carapace length of 18 cm. [3] Dorsal and ventral views of two different sized males
Charybdis natator, the ridged swimming crab, wrinkled swimming crab or rock crab, is a widespread Indo-Pacific species of swimming crab from the genus Charybdis. It gets its name from the ridges on the dorsal surface of the carapace. It is a crab species which is of minor importance in fisheries.
' ten-footed ') is a large order of crustaceans within the class Malacostraca, and includes crabs, lobsters, crayfish, shrimp, and prawns. Most decapods are scavengers . The order is estimated to contain nearly 15,000 extant species in around 2,700 genera, with around 3,300 fossil species. [ 1 ]
Female crab Xantho poressa at spawning time in the Black Sea, carrying eggs under her abdomen A Grapsus tenuicrustatus climbing up a rock in Hawaii. Each species has a particular number of zoeal stages, separated by moults, before they change into a megalopa stage, which resembles an adult crab, except for having the abdomen (tail) sticking out ...
For each molt, the juvenile will grow about 33% larger. [42] This process continues until the animal reaches its adult size. [42] When mature, female horseshoe crabs are typically 20–30% larger than males. [43] The smallest species is the mangrove horseshoe crab (C. rotundicauda) and the largest is the tri-spine horseshoe crab (T. tridentatus ...
A large crab with 15–20 cm of maximum length. Greyish green carapace is very broad and characterized by 3 red spots in posterior half. A strong spine can be seen on each side. Swimming legs are flattened and claws are long. [4]