Rossia
Rossia is a genus of bobtail squid in the family Sepiolidae. They are commonly known as “bobtail squid” or “glass squid” and are characterized by their relatively short, rounded bodies and lack of prominent fins. They are found in the northeastern Atlantic Ocean and the Mediterranean Sea. Rossia species typically inhabit sandy or muddy bottoms, burying themselves in the sediment to ambush prey.
Characteristics
Rossia squid have a distinct appearance compared to other squid. Their mantle is generally short and rounded, giving them their "bobtail" moniker. They lack the prominent fins found on many other squid species. Their arms are relatively short, with suckers arranged in two rows. They possess a pair of long tentacles that can be extended to capture prey. The coloration of Rossia squid can vary depending on the species and their environment, ranging from pale brown to reddish-brown. They are known for their ability to change color and texture to camouflage themselves against the seafloor.
Habitat and Distribution
Rossia squid are predominantly found in the northeastern Atlantic Ocean and the Mediterranean Sea. They are typically found in shallow to moderate depths, ranging from the intertidal zone to around 500 meters. They prefer sandy or muddy bottoms where they can bury themselves in the sediment.
Diet and Behavior
Rossia squid are carnivorous, primarily feeding on small crustaceans, fish, and worms. They are ambush predators, using their camouflage and sudden movements to capture prey. Rossia squid are solitary animals, although they may occasionally congregate in small groups during mating season.
Reproduction
Rossia squid are gonochoristic, meaning they have separate sexes. Males typically transfer spermatophores (sperm packets) to females during mating. Females lay eggs in clusters, which they often attach to seaweeds or other objects on the seabed. The eggs hatch into planktonic larvae that eventually develop into adults.
Species
The genus Rossia includes several recognized species:
- Rossia macrosoma
- Rossia moelleri
- Rossia glaucopis
- Rossia palpebrosa
- Rossia subtilis
- Rossia tortugaensis
References
World Register of Marine Species (WoRMS)
Animal Diversity Web
Wikipedia: Bobtail Squid