Thorunna halourga, commonly known as the “Thorunna halourga”, is a species of sea slug, a nudibranch, a marine gastropod mollusk in the family Chromodorididae. This captivating species is renowned for its striking coloration and intricate patterns, making it a sought-after subject for underwater photographers and marine enthusiasts alike.
Description & Characteristics
Thorunna halourga is a small to medium-sized nudibranch, with adults reaching a maximum size of approximately 25 millimeters in length. Its body is typically elongated and slender, with a characteristically smooth and glossy surface. A defining feature of Thorunna halourga is its vibrant coloration. The dorsal surface, or back, is usually a striking combination of contrasting hues, often featuring a deep, rich purple or blue base punctuated by bright yellow or orange spots or lines. These contrasting colors are not only visually appealing but also serve as a form of camouflage, allowing the nudibranch to blend into its surroundings.
Habitat and Occurrence
Thorunna halourga is a predominantly tropical species that prefers shallow, inshore waters. It is commonly found in coral reefs, rocky outcrops, and seagrass beds, where it thrives amidst the vibrant tapestry of marine life. While specific depth ranges vary depending on geographic location and habitat type, Thorunna halourga is typically observed at depths ranging from a few meters down to approximately 30 meters. The species is particularly abundant in the Indo-Pacific region, encompassing diverse marine zones such as the Red Sea, the Indian Ocean, and the western Pacific Ocean.
Taxonomy
Thorunna halourga belongs to the Class: Gastropoda, Order: Nudibranchia, and Family: Chromodorididae. This classification places the species within a large and diverse group of marine mollusks, characterized by their lack of a shell and their often striking and varied coloration.
Feeding
Thorunna halourga is a food specialist, relying primarily on sponges for sustenance. Sponges are porous, filter-feeding organisms that are abundant in many marine environments. The nudibranch’s diet consists of specific sponge species, which it locates using its highly developed sense of smell. The ingestion of sponges not only provides nourishment but also serves a unique purpose: Thorunna halourga is able to extract and store defensive compounds from its sponge prey, which it then utilizes as a form of chemical defense against predators.
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