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- Q896590 subject Q6463274.
- Q896590 abstract "A brachiolaria is the second stage of larval development in many starfishes it follows the bipinnaria. Brachiolaria have bilateral symmetry, unlike the adult starfish, which have a pentaradial symmetry. Starfish of the order Paxillosida (Astropecten and Asterina) have no brachiolaria stage, with the bipinnaria developing directly into an adult.The brachiolaria develops from the bipinnaria larva when the latter grows three short arms at the underside of its anterior end. These arms each bear sticky cells at the tip, and they surround an adhesive sucker. The larva soon sinks to the bottom, attaching itself to the substrate, firstly with the tips of the arms, and then with the sucker. Once attached, it begins to metamorphose into the adult form.The adult starfish develops only from the hind-part of the larva, away from the sucker. It is from this part that the arms of the adult grow, with the larval arms eventually degenerating and disappearing. The digestive system of the larva also degenerates, and is almost entirely rebuilt. A new mouth forming on the left side of the body, which eventually becomes the lower, or oral, surface of the adult. Similarly, a new anus forms on the right side, which becomes the upper, or aboral, surface.The coelom, or body cavity is divided into three chambers in the larva, two of which form the water vascular system, while the other remains as the adult body cavity. Once the tube feet develop from the water vascular system, the larva frees itself from the bottom. At around the same time, the skeleton begins to develop, initially in a ring around the anus; at this point the larva has developed into an adult, although it will continue to grow for some years before reaching sexual maturity.".
- Q896590 thumbnail Asterias_sp_older_brachiolaria_larva_from_below.png?width=300.
- Q896590 wikiPageWikiLink Q129270.
- Q896590 wikiPageWikiLink Q2406711.
- Q896590 wikiPageWikiLink Q247830.
- Q896590 wikiPageWikiLink Q25349.
- Q896590 wikiPageWikiLink Q2868401.
- Q896590 wikiPageWikiLink Q33753.
- Q896590 wikiPageWikiLink Q459987.
- Q896590 wikiPageWikiLink Q598159.
- Q896590 wikiPageWikiLink Q6463274.
- Q896590 wikiPageWikiLink Q665985.
- Q896590 wikiPageWikiLink Q682200.
- Q896590 wikiPageWikiLink Q684714.
- Q896590 comment "A brachiolaria is the second stage of larval development in many starfishes it follows the bipinnaria. Brachiolaria have bilateral symmetry, unlike the adult starfish, which have a pentaradial symmetry. Starfish of the order Paxillosida (Astropecten and Asterina) have no brachiolaria stage, with the bipinnaria developing directly into an adult.The brachiolaria develops from the bipinnaria larva when the latter grows three short arms at the underside of its anterior end.".
- Q896590 label "Brachiolaria".
- Q896590 depiction Asterias_sp_older_brachiolaria_larva_from_below.png.