Bat Star

Fascinating facts about the Bat Star

• The bat star is named for the webbing that joins its five short arms, giving the animal a wing-like silhouette reminiscent of a bat in flight. This distinctive webbing also contributes to its alternative names such as sea bat, webbed star and broad-disk star. The wide central disc and the thin, webbed arms together create a shape that is easily recognised by divers and researchers alike.
• While most individuals have five arms, some bat stars develop up to nine, attached to the same wide central disc.
• Bat stars are found from the shallow intertidal zone down to depths of 300 metres, occupying a broad swath of the Pacific coastline. Their distribution stretches from Sitka in Alaska all the way to Baja California, with the highest concentrations observed along California's Central Coast where kelp forests provide a steady food supply.
• Each ray ends in a tiny eye-like sensor that can detect light, allowing the bat star to spot drifting algae or moving prey. These visual sensors are positioned at the tip of every arm and respond to changes in illumination, guiding the star toward food sources on the ocean floor. Because the star is omnivorous, feeding on both plants and animals, the ability to locate prey quickly is essential for its survival.
• Polychaete worms of the species Ophiodromus pugettensis often take up residence in the grooves along the bat star's arms, especially on the side near the mouth. The worms feed on the leftover food particles that the star discards after digestion, creating a tidy feeding zone for both partners. Up to twenty of these worms can be found on a single star at any time, illustrating a close symbiotic relationship that benefits the star by keeping its surface clear.

Sources

Every fact above was checked against these pages, and kept only where one of them states it.

• Wikipedia

At a glance

About the Bat Star

In the vibrant tapestry of the ocean floor, the bat star unfurls its distinctive arms, a slow and deliberate dancer weaving through the undulating seaweed. As it moves, its brightly hued body glows like a beacon, a testament to the remarkable adaptability of this remarkable creature, which has evolved to thrive in the harsh, sun-scorched world of the intertidal zone. With each gentle flex of its arms, the bat star embodies the serene and mysterious beauty of the underwater realm, a true marvel of the marine world.

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