What is the function of Petasma?
It is hypothesized that the male uses the petasma, supported by the endopods of the second pleopods, to hook onto the female thelycum, adjusting position so that one erect genital papilla directly injects sperm mass into the aperture of one of the paired spermathecae.
What is Appendix Masculina?
A lappet inserted between the appendix interna and the mesial margin of the second pleopod of most male shrimps. Lappet, sometimes scalelike, at the mesial base of the endopod of the second pleopod (ventral to the appendix interna if latter present) in some males. …
What is Petasma in shrimp?
A complex genital structure attached to the mesial margins of the protopodites of the first pair of pleopods in male penaeidean shrimps. [ Abdominal appendage modified as gonapophysis in males of some eucarids, syncarids, and stomatopods. [
What is Nonpenaeid prawns?
Non-penaeid prawns constitute one of the important fishery resources contributing to 5.8% of total marine fish production. The non-penaeid prawn resource is multi-species, mainly supported by tiny species of the genus Acetes, in addition to Nematopalaemon tenuipes and Exhippolysmata ensirostris.
What’s the difference between a shrimp and a prawn?
Prawns have branching gills, claws on three pairs of their legs and second pincers that are larger than their front ones. Shrimp, on the other hand, have lamellar (or plate-like) gills, and claws on two pairs of their legs.
How many Cephalothoracic appendages are present in prawn?
The prawn carries, in all, nineteen pairs of appendages of which the first five are cephalic, the following eight are thoracic, and the remaining six are abdominal. Each of the first two segments bears a pair of prehensile antennae or feelers.
How can you distinguish a Caridean shrimp from a penaeid shrimp?
Penaeoids are another group of shrimps, distinguished from carideans by their very different reproductive biology (fertilized eggs spawned into the water for development rather than incubated by the female, as in the carideans), as well as by morphological and other biological differences.
What is the black vein in shrimp?
The black vein that runs along the shrimp’s back is its intestinal tract. In The California Seafood Cookbook, the authors (Cronin, Harlow & Johnson) state: “Many cookbooks insist that shrimp should be deveined.
Is there such thing as a pistol shrimp?
Pistol shrimp, also known as snapping shrimp, are a crustacean in the family Alpheidae. Their two front claws are different sizes, with one being notably larger than the other.
What are cephalic appendages?
The cephalic region contains six basic paired appendages: (1) compound eyes; (2) first antennae, which are biramous in the malacostracans; (3) second antennae; (4) mandibles; (5) first maxillae; and (6) second maxillae. The number of appendages on the thorax and abdomen vary greatly among large taxonomic groups.
Where are Caridean shrimp found?
Biology. Carideans are found in every kind of aquatic habitat, with the majority of species being marine. Around a quarter of the described species are found in fresh water, however, including almost all the members of the species-rich family Atyidae and the Palaemonidae subfamily Palaemoninae.
