Are pleopods Biramous?

Males have only two pairs of pleopods, located anteriorly on the abdomen. They function in sperm transfer. The first pleopod is the gonopod. Females have paired biramous pleopods on abdominal segments 2-5.

What is prawn Petasma?

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 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 Exopod in shrimp?

(Taxon-specific: Order Decapoda) One of two appendages of each abdominal somite (pleomere); typically consists of base (protopod) and two branches (endopod, exopod). Serves in swimming or variously modified as copulatory structures (e.g., gonopod, petasma) in male, egg-brooding structures in female.

How are pleopods and Pereopods difference?

External features of Penaeus The pleopods beat rhythmically to give forward swimming, during which the pereopods are folded up underneath the body (Dall et al., 1990).

What is Appendix Masculina?

A lappet inserted between the appendix interna and the mesial margin of the second pleopod of most male shrimps.

How many Cephalothoracic appendages are present in prawn?

There are five pairs of cephalic appendages: the antennules, the antennae, the mandibles, the maxillulae and the maxillae.

How many pleopods do shrimp have?

Shrimp have 5 pairs of pereopods. The first 3 pairs are used for feeding: the small chelae at the end of the pereopods are well adapted for probing the substratum and catching and holding small animals found there.

What is the main difference between Pereopods and pleopods?

The pereopods or legs are usually slender, but in some a single leg or pair of legs may be stout and some pereopods (the chelipeds) end in pincers or chelae. The pleopods or abdominal appendages used for swimming, are well developed and, except in a few species, are present on all five anterior abdominal segments.

What are Biramous appendages?

A biramous appendage is one that has two branches. Crustacean biramous appendages have a basal or first portion referred to as the protopod. (Proto means first or early, like prototype, and pod means foot, so protopodite means the first part of the foot).

What is a Biramous limb?

Biramous and uniramous The appendages of arthropods may be either biramous or uniramous. A uniramous limb comprises a single series of segments attached end-to-end. A biramous limb, however, branches into two, and each branch consists of a series of segments attached end-to-end.

What is a Pleopod in biology?

Pleopod definition (zool.) Any of the biramous appendages attached to the abdomen of higher crustaceans; swimmeret. noun. (zoology) One of the abdominal legs of a crustacean. In decapods such as lobsters, pleopods are legs mainly used for swimming but sometimes used for brooding eggs or catching food.

How many pleopods does shrimp have?

What are cephalic appendages?

There are five pairs of cephalic appendages: the antennules, the. antennae, the mandibles, the maxillulae and the maxillae. The. antennule (first antenna) is situated in front of the mouth just behind the base of the eye-stalk.

What are chelate legs?

The chelate legs are organs for offence and defence and help in holding the food before being taken. Gonopores are situated at the bases of the third walking legs in female; but in male, they lie at the bases of the fifth walking legs.

Do crabs have pleopods?

The function of males hermit crabs pleopods has always been obscure. However, at least in Dardanus, they are actively involved in water circulation within the shell for shell-cleaning and probably for ventilation.

What are the structural and functional differences between the pleopods of male and female crayfish?

Abstract. Crayfish have five pairs of abdominal limbs called pleopods. In males, the first and second pairs of pleopods are used for transferring spermatophores to the female during copulation. The remaining pleopods in males have no obvious function. Female crayfish use their pleopods to carry eggs.

What is Uniramous and Biramous?

A uniramous limb comprises a single series of segments attached end-to-end. A biramous limb, however, branches into two, and each branch consists of a series of segments attached end-to-end.

What is Biramous in biology?

adjective Biology. consisting of or divided into two branches: a biramous appendage.