Crayfishes are part of the subphylum Crustacea, and are part of the Phylum Arthropoda. Phylum Arthropoda have a bilateral body symmetry which means the body is divided into similar external right and left halves. The tissue organization of Phylum Arthropoda have three tissue layers, ectoderm, endoderm, and mesoderm; thus it is triploblastic. The body cavity of the phylum is coelomate meaning its organs are lined with mesoderm. Phylum Arthropoda embryonic development is protostome which means that the blastopore develops into the mouth first. Crustacea have compound eyes; thus, allowing to see images. They also have exoskeletons that are reinforced with calcium carbonate. Crayfishes have swimmerets which are appendages that are used for swimming and reproduction. …show more content…
Jellyfishes have a radial body symmetry; therefore, the body is arranged in a central axis. Jellyfishes are diploblastic, they have only two tissue layers, ectoderm and endoderm. Phylum Cnidaria are acoelomate, lacking a body cavity. Because Phylum Cnidaria are acoelomate, embryonic development does not apply to the phylum. Phylum Cnidaria name derives from cnidocytes which are special stinging cells that are used to trap its prey. Phylum Cnidaria have two body forms known as polyps, sessile or free-living, and medusas, free-swimming. Phylum Cnidaria also have no vascular system; thus, the gastrovascular cavity reaches all parts of the
Terrestrial isopods, commonly known as sowbugs, and pillbugs, given the nickname, roly-polies. Pillbugs develop this name because they have atendency to roll up when they feel like they have been threatened, on the other hand sowbugs do not show this behavior. Pillbugs belong to the members of Phylum Arthropoda and to the class of Crustacea. They share the class of Crustacea with many other unique animals such as the crayfish, lobster, shrimps, crayfish, and barnacles. Pillbugs have a hard segmented exoskeleton, 2 antennas, 2 compound eyes, and seven pairs of
Daphnia magna is a transparent water flea species found in rocky pools along the Atlantic Ocean. The Daphnia’s body is encased in a clear structure called carapace (Elenbaas, 2013). The exoskeleton, carapace, provides protection for the Daphnia magna, “The portion of the hard exoskeleton, or shell, that covers all or part of the body of many crustaceans…” (“Definition, n.d.). The heart can be easily seen under a light microscope due to the transparency of the skin (Handy, 2012).
Even though they are closely related to crustaceans, their bodies are particularly similar to crab and other sea creature with shells. The isopods have three distinct regions such as the head, thorax and abdomen (CISEO). Their characteristic as for what they look like is their claws attached to their abdomen. Also, they have a pair of antennae, simply small eyes and seven pairs of appendages connected to their segmented thoracic region.
Genetics of Homarus americanus • 100 pairs of inverted U-shaped chromosomes, common in crustaceans. Physiology of Homarus americanus Nervous System: Homarus americanus have a primitive nervous system, one similar to those of insects. Lobsters lack a brain and only contain about 100,000 neurons, a figure a million times less than the 100 billion found in humans. Ultimately, the American lobster has a bilaterally symmetrical nervous system. There are ganglia on each segment of the body, each made up of a paired hemi-ganglia.
“A crustacean is an aquatic arthropod of the class Crustacea, which comprises crabs, shrimp, barnacles, lobsters, and freshwater crayfish. The point is that lobsters are basically giant sea insects…not nice to look at. They’ll eat some live shellfish, certain kinds of injured fish, and sometimes one another.” (Wallace
After the food particles travel down the digestive tract, the waste gets released through the anus, which is “located on the ventral surface of the terminal appendage. The first and second pairs of legs are used in the organisms' filter feeding, ensuring that particles too large to handle are kept out while the other sets of legs create the stream of water rushing into the organism,” (Daphnia). 8. Describe the type of nervous
Like all crustaceans, lobsters molt their exoskeleton every year or two. They do this by splitting their carapace, the central section of their
Shrimp larvae (one male and one female) enter through the small pores, become trapped and spend the rest of their lives inside the sponge. This is not a bad thing, as the shrimp and the sponge have a mutualistic symbiotic relationship. The shrimp keep the basket clean and in return, the basket provides food for the shrimp. Shrimp larvae (one male and one female) enter through the small pores, become trapped and spend the rest of their lives inside the sponge. This is not a bad thing, as the shrimp and the sponge have a mutualistic symbiotic relationship.
The way sharks reproduce is by having the shark eggs fertilized inside the female. Jellyfish 's adaptations are their stinging cells. It 's their way of getting their food and keeping away from predators. Jellyfishes also use camouflage when it comes to predators. They use camouflage to have transparent
Horseshoe crabs (limulidae) play a major role in our ecosystem, health studies and basic lives; which is why there are many ongoing conservation programs for this species and the bays where they come ashore to lay their eggs. Horseshoe crabs play a major role in the ecosystem by providing numerous other animals with food, many of which are migratory birds or sharks. these crabs spawn on Delaware beaches during the spring full moons, with the largest spawning site being the Inland Bays. The most prominent of the migratory predators is the Red Knot (Calidris Canutus) which travels down the eastern US coast and gets most of its major nutrients from the horseshoe crab eggs.
Also, there was different categories of critters in the water. There are 846 critters in group 1, 288 critters in group 2, 466 critters in group 3. Due to the experiment of the water velocity, we found out that the velocity is random at each point. This is good, because it means that the dissolved oxygen levels are to be high. The crayfish, belonging to the crustacean group is plentiful in the creek.
A crab eats worms,clams,mussels,snails,sea urchins,sand dollars,barnacles,fish parts, and alge. Lobsters eat clams,mussels,starfish,crabs,and
Flagtail Surgeons, Paracanthurus hepatus, are identified by their bright blue coloring, oval bodies and yellow, flag-shaped tails. Adults have a narrow line of dark blue along their dorsal fin that curves back at the tail. Coloration changes as Flagtail Surgeons mature. Juvenile blue tangs are bright yellow with blue spots by their eyes, and their fins have light blue tips. Their bodies become blue as they mature (Thurston 2011).
There are multiple definitions for a Crustacea (109) Crustacea: “comprises carbs, shrimp, barnacles, lobsters, and freshwater crayfish.” (109), or according to the Merriam-Webster Dictionary, it is a type of animal (such as a crab or lobster) that has several pairs of legs and a body made up of sections that are covered in a hard outer
About 85% of all animals on the planet are part of the scientific group called Arthropods. Some Arthropods are shrimp, crayfish, krill, barnacles, scorpions, spiders, insects, centipedes, mites, ticks, lobsters and crabs. You can tell that an animal is an arthropod because all arthropods have more than one body segment , a body segment is a body part like the abdomen like a whale for example a whale has one solid body that is not split into separate parts. This means that they have a body made up of more than one section, flies have three separate body sections . Another way you can separate animals and arthropods is that they can have many legs the average spider has six legs and a millipede has lots of legs up to thousands!