A bipinnaria is the first stage in the larval development of most starfish, and is usually followed by a brachiolaria stage. Movement and feeding is accomplished by the bands of cilia. Starfish that brood their young generally lack a bipinnaria stage, with the eggs developing directly into miniature adults
Bipinnaria larva
The bipinnaria is free-living, swimming as part of the zooplankton. When it initially forms, the entire body is covered by cilia, but as it grows, these become confined to a narrow band forming a number of loops over the body surface. A pair of short, stubby arms soon develop on the body, with the ciliated bands extending into them.
In addition to propelling the larva through the water, the cilia also catch suspended food particles, and deliver them to the mouth (more correctly called a stomodeum).
Eventually, three additional arms develop at the front end of the larva; at this point it becomes a brachiolaria. In some species, including the common starfish Asterias, the bipinnaria develops directly into an adult.
It is very similar in appearance to the tornaria larvae of some Hemichordata, reflecting the descent of the Ambulacraria from a common ancestor.
A bipinnaria is the first stage in the larval development of most starfish, and is usually followed by a brachiolaria stage. Movement and feeding is accomplished...
second stage of larval development in many starfishes. It follows the bipinnaria. Brachiolaria have bilateral symmetry, unlike the adult starfish, which...
developing arm-like outgrowths. At this stage the larva is known as a bipinnaria. The cilia are used for locomotion and feeding, their rhythmic beat wafting...
Hemichordata such as the acorn worms. It is very similar in appearance to the bipinnaria larvae of starfishes, with convoluted bands of cilia running around the...
long band of cilia wrapped around its body, and somewhat resembles the bipinnaria larva of starfish. As the larva grows it transforms into the doliolaria...
referred to as a tornaria larva. These are very similar in appearance to the bipinnaria larvae of starfishes, with convoluted bands of cilia running around the...
larva while a brittle star has an 'ophiopluteus' larva. A starfish has a 'bipinnaria' larva, which develops into a multi-armed 'brachiolaria' larva. A sea...
reproduction of Labidiaster annulatus, but the larvae pass through at least one bipinnaria and one brachiolaria stage as has been demonstrated by DNA analysis. The...
larva bears resemblance to stages of all extant echinoderms, such as the bipinnaria and the brachiolaria of the starfish, the auricularia of the sea cucumbers...
collection of these cells is capable of re-aggregation into a viable bipinnaria larva. First the external epithelium is formed, then the internal structures...
gastrulation and become larvae. Once these begin to feed they are called bipinnaria, this stage then grows into the brachiolaria after growing five arms,...
several developmental phases. It becomes a gastrula in 2 to 3 days, a bipinnaria in 5 days, and finally a brachiolaria. Towards the end of the last stage...
gametes into the sea where fertilisation takes place. The eggs hatch into bipinnaria larva which drift with the plankton. In about 25 days they have grown...
increase the chance of fertilization taking place. The eggs hatch into bipinnaria larvae which form part of the zooplankton and develop over a period of...
detritus. L. clathrata spawns annually. The larvae pass through a planktonic bipinnaria stage, which lasts about a month before settling on the seabed, undergoing...
planktonic larvae are formed. At this stage, these larvae are known as bipinnaria. The planktotrophic larval stage for S. australis will last about 6 months...
males liberate gametes into the sea where fertilisation takes place. The bipinnaria larvae that hatch from the eggs are planktonic. They are bilaterally symmetrical...
juvenile migrates to the outside and detaches from the swimming larval bipinnaria stage. The larva continues to live separately for several months. Domanski...
employed for A. planci and developed through the typical larval stages of bipinnaria and brachiolaria. Numbers of late-stage larvae were 10-29% of the original...
some Echinaster produce larvae which first go through a smaller, feeding bipinnaria stage, and then through the second brachiolaria larval stage. Their eggs...
Sound in August. The larval development is also slow with the first, bipinnaria, stage lasting 2 months. The larvae remain near the seabed during this...
numbers of small eggs are produced and fertilisation is external. The bipinnaria larvae that develop from these form part of the zooplankton and disperse...
cells, and not by invagination. His critical study came from the larvae (bipinnaria) of a starfish, Astropecten pentacanthus (later reclassified as Astropecten...
Global Information