Preview

The Hydrazoa

Good Essays
Open Document
Open Document
480 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
The Hydrazoa
The Hydrozoa is a predatory organism which is quite small, although visible to the naked eye. (2) “The first record of Eutonina scintillans Bigelow, (Hydrozoa) was in temperate waters of the southwestern Atlantic Ocean in 1909.” Although first found in salt water, hydrozoans can also live in freshwater. Hydrozoans tend to live in colonies because if left alone, some cannot survive. Hydrozoans produce sexually, meaning an egg and sperm connect and form an embryo. (1) “Most hydrozoans show the same alternation between polyp and medusa phases that the Scyphozoa, or "true" jellyfish, have. A fertilized egg develops into a sessile polyp, which buds asexually and eventually buds off one or more medusae. The medusa produce eggs and sperm, reproduce sexually, and thus the cycle is repeated.” Occasionally what can happen is the medusa does not break away from the parent and is forced into a state of arrested development. A hydrozoan is closely related to jellyfish and corals. (3) “Though these organisms feed on smaller organisms, their digestive system is a simple gastrovascular cavity lined with flagellated cells that circulate food in with the filtering of water.” They can filter water through their body to consume organisms in the water just as sponges do. One advantage hydrozoans have is the ability to grab and paralyze its prey making it rather easy to capture its meal. Historically, the hydrozoans have been divided into a number of orders, according to the way they grow and reproduce. (4) “Hydrozoans or “water animals” belong to the phylum Cnidaria. Cnidaria, which means “stinging thread” contain over 10,000 species, 3200 of them belonging to class Hydrozoa. This phylum includes things such as Sea Anemones, Jellyfish, and Corals to sum it up. They are similar in that they possess radial symmetry, and all possess nematocysts that sting, which is mostly how they subdue their prey.” Hydrozoans have a wide variety of classifications and species allowing


Cited: 1. "Hydrozoa: More on Morphology." Hydrozoa Morphology. N.p., n.d. Web. 10 Nov. 2013.http://www.ucmp.berkeley.edu/cnidaria/hydrozoamm.html 2. "SciELO - Scientific Electronic Library Online." SciELO - Scientific Electronic Library Online. N.p., n.d. Web. 10 Nov. 2013. http://www.scielo.cl/scielo.php?pid=S0717 3. Class Hydrozoa." Index of /. N.p., n.d. Web. 10 Nov. 2013.http://jupiter.plymouth.edu/~lts/invertebrates/Primer/text/hydrozoa.html 4. N.p., n.d. Web. 10 Nov. 2013. http://dept.lamar.edu/biology/faculty/abc/student%20pages/justin%20pittman.htm
Continue Reading
View Writing Issues

You May Also Find These Documents Helpful

  • Satisfactory Essays

    Bio 20 Final Review
    • 317 Words
    • 2 Pages

    Bio 20 Final Review

    a Bio 20 Final Review SA Phylum | Example | Characteristics | /36 | | | Porifera | Glass Sponge | No true tissue, use collar cells No movement as adult | Cnidaria | Jellyfish | Polyp or Medusa Nerve net | Platyhelminthes | Fluke | Nerve cells that act as a brain Live in bodies | Nematoda | Hookworm | Taper at both ends False coelom, parasitic | Annelida | Earthworm or Leech | Segmentation Hydro skeleton | Mollusca | Octopus or Clam | Mantle, Gills, True coelom Muscular foot, Adductor | Arthropoda | Lobster, Spider or Ants | Jointed appendages Molting , Metamorphosis | Echnodermata | Sea star or sand dollar | Spiny skin Regenerate lost/damaged parts | Chordata | Whale or Human | Notochord/backbone Tail, Dorsal nerve chord | Animal Phylum Class | Example | Characteristics | //28 | | | Agnatha | Lamprey | No JawsParasitic | Chondrichthyes | Hammerhead shark | No swim bladderPelvic fins and gill slits |…

    • 317 Words
    • 2 Pages
    Satisfactory Essays
    Read More
  • Good Essays

    Daphnia Experiment
    • 654 Words
    • 3 Pages

    Daphnia Experiment

    Daphnia, also known as the water flea are planktonic crustaceans that are found in lakes, ponds, and streams. They received “their common name from their jerky movement through the water” (Clare). They are also “very small, usually 2-5mm long, with an overall shape similar to a kidney bean” (Elenbaas). Daphnia play an important role in the freshwater food chains and serve as food for other freshwater organisms such as fish. They are also commonly used to test for chemical toxicity in water. Since Daphnia have transparent body, it is easier to observe their heart rates, and other visceral organ systems. Its small heart rate is easily visible when viewed under a microscope. A change in its heart rate plays a crucial role in determining whether…

    • 654 Words
    • 3 Pages
    Good Essays
    Read More
  • Powerful Essays

    Bio 101 Week 4 Assignment
    • 1287 Words
    • 6 Pages

    Bio 101 Week 4 Assignment

    The cephalopodor octopus is a marine organism that inhabits many diverse regions of the ocean. Its food source consists of crabs, small fish, clams, mussels and other marine animals. The octopus is a predatory animal and has developed many skills to aid in its survival in the environment it has adapted to.…

    • 1287 Words
    • 6 Pages
    Powerful Essays
    Read More
  • Good Essays

    Week 7 Checkpoint: Physiology Assignment
    • 527 Words
    • 2 Pages

    Week 7 Checkpoint: Physiology Assignment

    I chose to look up a diagram on a sea dwelling organism known as a Jellyfish. Jellyfish have many different forms and are often characterized in different groups. One jellyfish that stood out to me was the Aurelia or also known as the Moon Jellyfish, which is like the basic jellyfish that I’ve always seen in pictures and books growing up. Jellyfish are said to be very effective predators, as one point in the time they were considered to be at the top of food chain. Being effective predators makes them physically fit to be in any environment that they travel to. Even though most would say that jellyfish are horrible swimmers, they are actually in fact many are very strong precise swimmers. Jellyfish can swim horizontally and vertically by using contraction against their bell to expel jets of water to propel them. One drawback of them not being stronger swimmers like larger fish is that they often get caught in sea currents and get stuck in them as they go pass. The bell that propels them has a thick ring of strong muscle, called the coronal muscle. That muscle generates most of the power and energy used by a jellyfish. Now hanging from their subumbrellar is a projection called the manubrim which has the mouth its terminus. The mouth is often surrounded by oral arms normally just for but can sometimes be a multiple of four such as eight, depending on the type of species. Jellyfish don’t have a brain but they do bear a sophisticated computer which tends to all its needs and functions throughout the jellyfishes body. Though not as complex as a normal brain, it does suit the jellyfish well. Now on the edge of the underside of the jellyfish’s bell are its tentacles. The tentacles too can range in different numbers and sometimes some have thousands. These tentacles can be used to feed it, but also are use as it self defense mechanism to protect and also to hunt. The body and tentacles of a jellyfish can discharge…

    • 527 Words
    • 2 Pages
    Good Essays
    Read More
  • Good Essays

    Hyalella Seonsory
    • 344 Words
    • 2 Pages

    Hyalella Seonsory

    Chemosensory organs in many crustaceans including Hyalella azteca allow them to locate food and mates while entirely avoiding predators. When detecting environmental changes such as the change in chemicals such as salinity, many amphipods have tiny hair-like organs containing sensory cells called sensilla (Hallberg, 2011). These chemosensory olfactory receptors are virtually found on many parts of the crustacean body including antennae, mouthparts and tips of the walking appendages (Hallberg, 2011).…

    • 344 Words
    • 2 Pages
    Good Essays
    Read More
  • Satisfactory Essays

    Invertebrate Research: Stove Pipe Sponge
    • 306 Words
    • 2 Pages

    Invertebrate Research: Stove Pipe Sponge

    If a diver or went snorkeling, it would be very lucky to find the Aplysina archeri, also known as the Stove Pipe Sponge. This sponge is in the Kingdom of Animalia, Phylum of Porifera, Class of Demosphongiae, Order of Verongida, Family of Aplysinidae, Genus of Aplysina, and Species of A. archeri. This sponge gets its name from its cylindrical shape and long tube like structure. It can grow up to 150 cm long with diameter of 10 cm. Sometimes they grow as a single tube but it usually in groups with up with as many as 22 tubes, usually in contact at their base. Their exterior is rubbery covered with bumps and ridges and colored pink, brown, or purple grayish. Unlike their outside their insides are remarkably smooth and often cream colored, always lighter than their exterior. They live on reefs from the drop off to deep water and can be found in the Atlantic Ocean. They are very popular in the Caribbean, Bahamas, Florida, and Bonaire. Snails feed off these sponge but are no threat to them compared to humans. The dense populations of these sponges have gone down because of toxic dumps and the oil spill. Stove Pipe Sponges are filter feeders and eat plankton or suspended detritus as it passes them. They reproduce sexually and asexually. When they release sperm, it floats in the oceans water and eventually lands somewhere. Wherever it lands, it begins to reproduce cells and grow. They can take up to hundreds of years to grow and don’t stop until they die. Two interesting facts about the Stove Pipe Sponges are they get largest in turbid water and they can buckle and bend with their weight.…

    • 306 Words
    • 2 Pages
    Satisfactory Essays
    Read More
  • Good Essays

    Salinity In The Daphnia
    • 470 Words
    • 2 Pages

    Salinity In The Daphnia

    The Daphniidae daphnia is a freshwater crustacean from the branchiopod class that is common to most ponds, lakes, pools, streams and springs around the world. The water flea, as it is sometimes referred to, is very small in size growing to a length of less than ¼ inch, it has a flat back, a rounded belly, black round eyes and a pair of antennae (Kindersley, 2006). The Daphnia have leaf-like appendages used in respiration, filter feeding and locomotion (Miller, 2010). Unfortunately, due to the size of these crustaceans they are often easy prey for bigger organisms in their ecosystem. Daphnia are often found in the bottom layers of the water column during the day and the upper layer at night to avoid visually feeding fish (Dawidowicz, 1992).…

    • 470 Words
    • 2 Pages
    Good Essays
    Read More
  • Satisfactory Essays

    Study Guide 3
    • 313 Words
    • 2 Pages

    Study Guide 3

    Active movement 5. Sexual reproduction 6. Embryo development(zygote>morula>blastula>blastopore/gastrula) Parazoans VS Eumetazoans. Eumetazoans as triploblastic organisms. Eumetazoan 4 key body plans 1.…

    • 313 Words
    • 2 Pages
    Satisfactory Essays
    Read More
  • Satisfactory Essays

    A Tale Of Two Flagella By Olivia Judson
    • 260 Words
    • 2 Pages

    A Tale Of Two Flagella By Olivia Judson

    In her article, “A Tale of Two Flagella,” Olivia Judson (2010) states that the dinoflagellate is considered a plant, animal, predator, and a parasite. A dinoflagellate is defined as a large group of single celled organisms that can be helpful and harmful. Dinoflagellates are very diverse in characteristics and abilities. For example, some dinoflagellates perform photosynthesis, some have eyes, and others capture and eat prey. A dinoflagellate can look like a small brown ball that is structured as whorls and spines. Some are microscopic and others can grow as big as caviar.…

    • 260 Words
    • 2 Pages
    Satisfactory Essays
    Read More
  • Good Essays

    Crinoids Research Paper
    • 602 Words
    • 3 Pages

    Crinoids Research Paper

    The arms are composed of an articulated series of ossicles that are used in suspension feeding and respiration. Reproductive organs are also located in the arms as fertilisation takes place in open water during mass spawnings.…

    • 602 Words
    • 3 Pages
    Good Essays
    Read More
  • Good Essays

    Ecological Succession Lab
    • 736 Words
    • 3 Pages

    Ecological Succession Lab

    We identified the eubranchipus, a organism with similar characteristics to one of a shrimp. Another name for it would be the fairy shrimp. During this observation, only two eubranchipus were identified. We did not have as many eubranchipus as the other groups but we were able to put one under the microscope. This organism has very fast movement and many legs. Another observation we made was that they swim upside down instead of right side up. Bothe of he fairy shrimps were translucent. The colors of them are determined by the food supply of their environment. These organisms started off as dried out eggs but as soon was we added tap water, it made food sources available in order to survive , therefore allowing the eggs to hatch. On the fifth observation, one of our eubranchipus died as another one grew bigger. The surviving shrimp started off as being 0.8 cm and increased to 1.2 cm. This is probably because of the lack of resources and competition - survival of the fittest. Less protist of the same size were found and the water was more still due to the limited organisms living in it. The population of protists are decreasing because it is the food source of the eubranchipus (also cynobacteria). Again, this is because of the existence of a food…

    • 736 Words
    • 3 Pages
    Good Essays
    Read More
  • Powerful Essays

    Shark and Spiny Dogfish
    • 754 Words
    • 4 Pages

    Shark and Spiny Dogfish

    13. How can you tell if a shark is a male or female just by looking at it?…

    • 754 Words
    • 4 Pages
    Powerful Essays
    Read More
  • Good Essays

    Effects of Caffeine
    • 671 Words
    • 3 Pages

    Effects of Caffeine

    Daphnia magna is a fresh water ectothermic crustacean commonly referred to as water flea. Because of its transparency we can observe the effects of substances on its body without surgical procedures. We can observe the heart rate of daphnia magna to be dorsal to the backbone just behind the head. (Helms 1998) the average daphnia magna has a heart rate of 180 beats per minute under normal conditions. We will observe the effects of water, alcohol and caffeine on the ectothermic animal.…

    • 671 Words
    • 3 Pages
    Good Essays
    Read More
  • Good Essays

    Hydra
    • 537 Words
    • 3 Pages

    Hydra

    After slaying the Nemean lion, Eurystheus sent Heracles to slay the Hydra, which Hera had raised just to slay Heracles. Upon reaching the swamp near Lake Lerna, where the Hydra dwelt, Heracles covered his mouth and nose with a cloth to protect himself from the poisonous fumes. He fired flaming arrows into the Hydra's lair, the spring of Amymone, a deep cave that it only came out of to terrorize neighboring villages.[4] He then confronted the Hydra, wielding a harvesting sickle (according to some early vase-paintings), a sword or his famed club. Ruck and Staples (1994: 170) have pointed out that the chthonic creature's reaction was botanical: upon cutting off each of its heads he found that two grew back, an expression of the hopelessness of such a struggle for any but the hero. The weakness of the Hydra was that it was invulnerable only if it retained at least one head.…

    • 537 Words
    • 3 Pages
    Good Essays
    Read More
  • Satisfactory Essays

    Protista Lab Report
    • 376 Words
    • 2 Pages

    Protista Lab Report

    Concept- the concept of this lab was to explore what is in the pond water as living organisms and try to identify what it is. Some types of Protista are multi-cellular like giant kelp. Although they look much like plants, multi-cellular protists lack specialized tissues. Being eukaryotes, they have a membrane-bound true nucleus with linear chromosomes, and they have membrane-bound organelles. The kingdom Protista contains all eukaryotes that are not plants, animals, or fungi. The sexual cycles of many Protista are unknown, but most are thought to have some process of genetic recombination. Unicellular Protista can feed on other organisms in the manner of an animal, but it also has chloroplast and can perform photosynthesis…

    • 376 Words
    • 2 Pages
    Satisfactory Essays
    Read More

Related Topics