Despite its name the jelly fish is not even a fish because it has no vertebrae. The medusozoa are broken up into four classes scyphomedusae ("true" jellyfish), stauromedusae (stalked jellyfish), cubomedusae (box jellyfish) and hydrozoa. The jellyfish body can take on various forms from the more commonly known bell or umbrella shape or they can be flat and disc like based on the species. This paper will focus on the scyphomedusae or “true jellyfish”. We will look at the like cycle, habitat, resources it needs, and ethical issues concerning the animal.
Of the four classes of cnidarians, jellyfish come from both the Hydrozoa and Scyphozoa classes. Most jellyfish are schphozoids, while the Portuguese Man-of-War (Physalia physalis) is a hydroid. As cnidarians, jellyfish possess two tissue types: endoderm and ectoderm, in addition to a single cell layer of jelly-like mesoglea between the endoderm and the ectoderm (Russell 21). Jellyfish exhibit radial symmetry and have tentacles with stinging cells known as cnidocytes. They range in size from a few millimeters up to a bell size of two meters across, with tentacles up to thirty-six meters long.
Biology of a Squid Squids are among the most varied and unique of all invertebrates. They are mollusks of the Class Cephalopod, along with the nautilus, cuttlefish, and octopus. Squids are highly evolved, and have developed a number of traits uncommon to most other mollusks. Fossil records of cephalopods have dated back the Cambrian Period (about 600 million years ago). Structurally, squids have only small variations of a basic theme common to all cephalopods.
Macropinna microstoma is the only species in the macropinna genus and it is quite similar to the fish of the genus Opisthoproctus. The name spook fish is also widely used. 3. Adults are dark colored with the exception of eye region. They have green colored tubular eyes turned upward and covered by colorless semi-spherical capsule that protects the eyes giving the impression that the head is transparent.
Like other turtles, sea turtles lack teeth. Jaw shape varies among species. Each species has a jaw shape adapted for its diet. Sea turtles, depending on the species, may eat seagrasses, algae, sponges, sea squirts, squid, shrimp, crabs, jellyfish, cuttlefish or sea cucumbers. Leatherbacks can dive to a depth of more than 1,000 meters (3,000 feet) in search of their prey, jellyfish.
Sea anemones and corals are consistently found as polyps, and jellyfish have a polyp stage early in their development. These polyps are mostly sessile, but some have the ability to relocate themselves if necessary. When jellyfish mature they are medusae with a fully formed bell. When in the medusae stage jellyfish are completely mobile. Both of these forms are radially symmetrical.
Unlike the terrestrial snakes that have imbricate (overlapping) scales to protect against abrasion, the scales of most sea snakes that dwell at pelagic depths do not overlap. Reef dwelling species however, have imbricate scales to protect against the sharp corals and other objects on the sea floor. The scales may be smooth, keeled, spiny or granular (Cyberlizard, 2002). Many of the species have adapted to their environment, most characterized by their paddle-like tail that has increased their swimming ability (Wikipedia, 2011). The bodies of many of the species are laterally compressed, causing the ventral scales to become reduced in size, reducing their ability to crawl on land.
There is no heart, but the major vessels can contract in waves to move the blood. Phoronids usually have a length of 2 cm. It eats along with the lophophore and it lives in the seas. It lived in the early Jurassic. (scientific name- Phoronida)
Their body are covered with scales. Generally speaking, the Scorpaenidae family fish have different number of spines over the course of the body. Most known type pf Scorpaenidae are lionfish and scorpionfish. Lionfish have preorbital bone with 3 spines, spines and third below the diagonal; , big mouth, end position, oblique fissure. Mandible, vomer and jaw bone with villiform teeth group.
Hippocampus The Genus Hippocampus belongs to the family Syngnathidae, order Syngnathiformes, class Osteichthyes, phylum Chordata, and kingdom Animalia. The genus Hippocampus is made up of more than twenty different species of seahorses (Beltran). They live preferably in the coral reefs or sea grasses where they can easily camouflage to avoid predators. They are found mostly in the tropical or temperate shallow water areas of the oceans around the world. Seahorses are most closely related to sea dragons, pipefishes, and the flagtailed pipefishes (Seahorses).