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Luidia maculata is a large starfish, up to 25 cm (10 in) in diameter. There are usually seven or eight (sometimes nine) long, slender, pointed arms and a relatively small central disc. The aboral (upper) surface is flat, with some granulations, the surface covered with flat-topped, table-like structures known as paxillae.
Patiria miniata, the bat star, sea bat, webbed star, or broad-disk star, is a species of sea star (also called a starfish) in the family Asterinidae. It typically has five arms, with the center disk of the animal being much wider than the stubby arms are in length. [2] Although the bat star usually has five arms, it sometimes has as many as ...
The starfish body plan consists of five to six arms radiating from a central disk. Regenerative ability differs greatly among starfish species, but can generally be classified within three categories: unidirectional regeneration, disk-dependent bidirectional regeneration, and disk-independent bidirectional regeneration.
L. ciliaris is an orangeish-brown colour and has seven long arms radiating from a small disk. It is a large but fragile sea star, growing to 40 cm (16 in) across, and easily losing its arms (which afterwards regenerate). The arms have parallel sides and taper only near the tip. They have a conspicuous fringe of white spines along the margins.
The body outline is similar to that of starfish, in that ophiuroids have five arms joined to a central body disk. However, in ophiuroids, the central body disk is sharply marked off from the arms. [5] The disk contains all of the viscera. That is, the internal organs of digestion and reproduction never enter the arms, as they do in the Asteroidea.
It grows to a diameter of about 30 to 40 centimetres (12 to 16 in). The aboral or upper surface has a patchwork of closely packed spiny plates. The square ones near the edge of the arms are cream coloured and the irregular ones in a band running down the middle of the arms are grey. The margins of the arms are fringed with short white spines.
The gonads are underneath the sides of each arm. [2] Its colour is usually grey or light brown, but can be tinged with pink. The central row of plates on the upper side of the arms is usually dark grey or black. The underside of the starfish is a paler colour. [3]
Echinaster luzonicus, the Luzon sea star, [2] is a species of starfish in the family Echinasteridae, [1] found in shallow parts of the western Indo-Pacific region. It sometimes lives symbiotically with a copepod or a comb jelly, and is prone to shed its arms, which then regenerate into new individuals.