Macrobrachium villosimanus
Species of prawn
From Wikipedia, the free encyclopedia
Macrobrachium villosimanus, commonly known as the Dimua river prawn, is a species of freshwater prawn belonging to the family Palaemonidae, found in the fresh waters in South Asia.
| Macrobrachium villosimanus | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Clade: | Pancrustacea |
| Class: | Malacostraca |
| Order: | Decapoda |
| Suborder: | Pleocyemata |
| Infraorder: | Caridea |
| Family: | Palaemonidae |
| Genus: | Macrobrachium |
| Species: | M. villosimanus |
| Binomial name | |
| Macrobrachium villosimanus Tiwari, 1949 | |
Taxonomy
Macrobrachium villosimanus was first described in 1949 by Krishna Kant Tiwari as Palaemon villosimanus before being transferred to Macrobrachium.[1]
Description
Macrobrachium villosimanus has a rostrum with a raised crest at the base, which is quite long and has a bare section on the upper edge. Males can grow up to 104 mm, while females can reach a maximum length of 117 mm. It has between 12 and 14 teeth on the upper jaw and 7 to 10 on the lower jaw.[2] The tip of the telson, or tail, goes beyond the longer back spines. In adult males, the carpus of the second pereiopod is subequal to the chela,[2] with the fingers being just under half the length of the palm. The body is flesh-colored, sometimes with dark brown spots. Large yellowish and brownish blotches appear on the sides of the abdomen where the segments meet. The flagella, which are long, whip-like structures, are brownish-red in the outer two-thirds.[3]
The body length and body weight growth rate in males significantly decreases after sexual maturity, while it increases in females after reaching morphological sexual maturity.[4]
Habitat
Reproduction
Macrobrachium villosimanus has a continuous breeding season that occurs year-round, with peak activity in March and again from June to December. Female prawns reach sexual maturity at a minimum carapace length of 13.3 mm, where egg volume increases by 42.9% across four stages, and are capable of iteroparous spawning. The number of eggs produced is proportional to the size of the female prawn.[6] The eggs are yellowish and laid in large numbers.[3]