Armina

Description

Armina species exhibit a range of colors, from bright orange to pale yellow, with varying patterns of spots or stripes. Their bodies are typically elongated and cylindrical, with a broad, flattened head. They have a prominent oral veil, which helps them to capture prey. The most defining characteristic of Armina is their numerous cerata, which are covered in stinging cells called nematocysts. These nematocysts are used to paralyze and capture prey, primarily hydroids and other cnidarians. The cerata are often arranged in rows along the back of the body, and they can be retracted when the animal is threatened.

Habitat and Distribution

Armina species are found in a variety of marine environments, including rocky shores, sandy bottoms, and coral reefs. They are typically found in shallow waters, but some species can be found at depths of up to 100 meters. The genus is distributed worldwide, with species found in the Atlantic, Pacific, and Indian Oceans.

Diet

Armina species are carnivorous and feed primarily on hydroids and other cnidarians. They use their oral veil to capture prey and then swallow them whole. The nematocysts from the prey are absorbed by the Armina and used to defend against predators.

Reproduction

Armina species are hermaphroditic, meaning they have both male and female reproductive organs. They reproduce sexually, with fertilization occurring internally. After fertilization, the female Armina lays eggs in gelatinous masses, which are typically attached to rocks or other surfaces.

Notable Species

Some notable species within the genus Armina include:

• Armina maculata
• Armina californica
• Armina tigrina

References

For further information on Armina, consult the following resources:

• World Register of Marine Species (WoRMS)
• Sea Slug Forum
• iNaturalist