Thordisa
Thordisa is a genus of sea slugs, specifically nudibranchs, in the family Polyceridae. These colorful and often striking invertebrates are found in the intertidal zones and shallow waters of various marine environments, primarily in the Indo-Pacific region. They are known for their diverse coloration, featuring a wide range of vibrant hues and patterns.
Common Names
While scientifically known as Thordisa, these sea slugs lack widely recognized common names. They are often referred to simply as "nudibranchs" or more specifically, "polycerid nudibranchs," due to their belonging to the Polyceridae family.
Characteristics
Thordisa species share several common characteristics:
- Body Shape: They typically have elongated, oval-shaped bodies with distinct, prominent rhinophores (sensory organs) on their head.
- Coloration: These nudibranchs exhibit a wide range of vivid colors, including shades of red, orange, yellow, green, blue, and purple. Their patterns can be intricate and vary between species and even individuals within the same species.
- Cerata: Most Thordisa species possess cerata, which are finger-like projections on their backs. These cerata serve a dual purpose: respiration and defense. They can be adorned with bright colors and patterns, further adding to the visual appeal of these sea slugs.
- Size: They can range in size from a few millimeters to several centimeters in length. The largest species, Thordisa monstrosa, can reach lengths exceeding 10 cm.
Environment
Thordisa nudibranchs are primarily found in the tropical and subtropical waters of the Indo-Pacific region. They prefer habitats with abundant algae and other invertebrates, which they rely on for food. Their diet consists primarily of sponges and other sessile organisms. The presence of these sea slugs can often be an indicator of healthy coral reefs and other marine ecosystems.
References
For further information on Thordisa, please refer to the following resources: