HAND-1>The carpus contain nine small carpal bones.
2>These are radiale,intermedium and ulnare in proximal rows.
3>The centrale, trapezium,trapezoid,magnum,unciform in distal row.
4>The terminal phalanx bears a horny claw.
5>There are five elongated metacarpals,and phalanges are respectively.
1>Belong to family Otididae.
2>Having largest flying bird in the world.
3>It is commonly called as hukna,tuqdar,or gorawan.
4>Bird having 1 meter tail.
5>Its plumage is dull brown above and white below.
6>It is no longer an endangered bird in Rajasthan.
1>It is commonly called as sea-pentagon.
2>The central disc is large and the five arms are short and tapering.
3>The aboral surface bears immovable tubercles,a madreporite and anus.
4>The oral surface is concave,having a central mouth.
5>The upper marginal plates are smaller than the ventral ones .
SPIUNCULUS-1>It is commonly known as PEA-NUT.
2>About 25 cm cm in length
3>The circulatory system is absent.
4>The coelom is large and undivided.
5>The fertilization is external.
6>The larva is trochophore larva.
7>The spiunculus is generally sedentary and feeds upon detritus.