A specialize cell unique to the phylum Cnidaria. It contains a capsule-like organelle housing a coiled thread that, when discharged, explodes outward and functions in prey capture or defense.
The unique cephalopod mollusks can be found in the Indian and Pacific Oceans, living in rock crevices and coral reefs. Several characteristics make the nautilus stand out from other mollusks and marine animals. Unlike other mollusks, the nautilus has a hard external shell, which takes the form of a spiral.As the animal grows, it seals off chambers in the shell which fill with gas, making the shell buoyant so that the nautilus can swim.he beauty of the nautilus shell has inspired many beach-oriented establishments or brands to name themselves after it. One example is the Nautical Hotel in Santa Teresa, Costa Rica. Though the design of the hotel itself bears no resemblance to the nautilus shell, the name conveys a sense of paradise.
Unique Characteristics. 1.The skeleton of the cartilaginous fish is out of a flexible bone-cartilage. The skeleton does not have any bone. 2.These fish have dorsal fins, an anal fin, a pair of ventral fins and a single caudal fin.he bony fish have a pair of gills that are situated inside their bodies, and the cartilaginous fish have gill slits on the outer side of their bodies, present on both sides. In the cartilaginous fish, the teeth, nostrils on the side of the head and the tiny tooth like scale are not fused together to the jaw.