Phylum Porifera

Better Essays
Topics: Phylum
PHYLUM PORIFERA
DELA CRUZ, R., DUMLAO, D., PASCUA, M., SAN JUAN, R.,1
1Department of Biology, College of Science, University of the Philippines Baguio
July 17, 2012

ABSTRACT
| |
|Sponges [Porifera] are unusual animals whose body plans make interpreting phylogenetic relationships within the group and with other basal |
|metazoan taxa a difficult task. In this exercise, different species of Poriferans were observed. It will be used then to determine their |
|defining characteristics as an invertebrate. The skeletal elements of the Poriferans, the spicules, are formed enzymatically by the anabolic |
|enzyme silicatein and the catabolic enzyme silicase. Both, the spicules of Poriferans, comprise a basal skeleton made up of calcium carbonate,|
|central axial canal and an axial filament which harbors the silicatein. The data collected here substantiate the findings that Poriferans |
|still exist. These findings are makes us further understand the basic pathways in the body plan formation of sponges. |

DISCUSSION
Poriferans get their nutrition by staying in one place, pumping water through themselves, and filtering it for small organisms and bits of food that they digest. Sponges are protected from predators by their low nutrition content as well as irritating spines distributed throughout their bodies, called spicules, which also double as a "skeleton. The spicules are secreted by specialized mesenchyme cells known as scleroblasts. Scleroblast secreting a calcareous spicule is called calcoblast while that producing a siliceous spicule is called silicoblast.

All the activities of their body of the sponges depend on the current of water entering through ostia and passing out through osculum or oscula. Inside the body, water current flows through system of spaces which



References: "The Characteristics of the Classes of Sponges." Suite101.com. N.p., n.d. Web. 16 July 2012. . "Porifera (sponges)." Porifera (sponges). N.p., n.d. Web. 16 July 2012. . "Modern Biology." Google Books. N.p., n.d. Web. 16 July 2012. . "Biology-Today.com." Canal System in Sponges (Porifera). N.p., n.d. Web. 16 July 2012. .

You May Also Find These Documents Helpful

  • Satisfactory Essays

    Phylum: Porifera A sponge has differentiated cells and functionally distinct layers. The ameobocytes secrete spicules which stack up together to make the sponge. The choanocytes are composed of a flagellum and a collar (collar cells). The amoebocytes and choanocytes are the work force of the sponge--they create the body of the sponge. The major sponge groups of today had an ancestor in the Cambrian period. The sponges reproduce either sexually or asexually. When they reproduce sexually, they…

    • 747 Words
    • 3 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Porifera

    • 322 Words
    • 2 Pages

    Porifera? Porifera is a phylum under the kingdom of Animalia. Porifera is the oldest phylum in this kingdom and has been around for the last 600 million years. The most common organism in this phylum is sponges. Porifera comes from the Latin words porus (pore) and ferre (bear), meaning "pore-bearer". This is a reference to the numerous holes (pores) on the sponge 's surface. Characteristics of Porifera  All organisms belonging to the phylum Porifera;  Have no definite symmetry  Have…

    • 322 Words
    • 2 Pages
    Satisfactory Essays
  • Powerful Essays

    Phylum Lab

    • 3867 Words
    • 16 Pages

    Animal Phyla Lab Adapted from “Phylum Lab” produced by the National Aquarium in Baltimore The diversity of animal life on Earth is astounding. Each animal has a unique body plan which allows it to survive and adapt to its given surroundings. With such an abundance of species, classifying animals into different categories is necessary. At first the diversity of animals can be overwhelming, but after further research and observation, many likenesses appear. These similarities become the basis for…

    • 3867 Words
    • 16 Pages
    Powerful Essays
  • Satisfactory Essays

    Animal Phylums

    • 694 Words
    • 3 Pages

    Biology Animal Phylums "Write a three sentence description for each phylum and list two examples for each. Also, draw a picture of a common example from each. (or cut out of a magazine). You will be graded on how accurate your information is as well as neatness." Sponges (Porifera): Poriferans don't have mouths; instead, they have tiny pores in their outer walls through which water is drawn. Cells in the sponge walls filter nutrients from the water as the water is carried through the body…

    • 694 Words
    • 3 Pages
    Satisfactory Essays
  • Satisfactory Essays

    phylum nematode

    • 644 Words
    • 3 Pages

    Phylum nematode Characteristics of Nematoda:- 1)Bilaterally symmetrical, and vermiform. 2) Body has more than two cell layers, tissues and organs. 3) Body cavity is a pseudocoel, body fluid under high pressure. 4) Body possesses a through gut with a subterminal anus. 5) Body covered in a complex cuticle. 6) Has a nervous system with pharyngeal nerve ring. 7) Has no circulatory system (no blood system) 8) Reproduction normally sexual and gonochoristic. 9) feed on just about everything…

    • 644 Words
    • 3 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Phylum Cndaria

    • 250 Words
    • 1 Page

    John Smith Biology 1/1/1 Phylum Cnidaria Phylum Cnidaria is a group of sea animals including jellyfish, sea anemones, hydra, and coral. There are two forms a Cnidaria can take; A polyp (like sea anemones), and medusa (like jellyfiish). Jellyfish inhabit every ocean in the world; Most live in salt water, but a few species are able to survive in fresh water. Jellyfish aren't really supposed to be called “fish” because technically they are not fish. Some people just refer to them as Jellies…

    • 250 Words
    • 1 Page
    Satisfactory Essays
  • Satisfactory Essays

    The Phylum Mollusca

    • 516 Words
    • 3 Pages

    "soft"), which is generally protected by a hard, calcium- containing shell. In some forms however, the shell has been lost in the course of evolution, as in slugs and octopuses, or greatly reduced in size and internalized, as in squids. Mollusks (Phylum Mollusca) are found in marine, brackish, and fresh waters. They include a diverse group of animals such as clams, mussels, oysters, scallops, abalone, conchs, shipworms, snails, nudibranchs, chitons, squids, and octopuses. Common methods of introduction…

    • 516 Words
    • 3 Pages
    Satisfactory Essays
  • Good Essays

    Phylum Annelida

    • 516 Words
    • 3 Pages

    Phylum Annelida L. annelleus = little ring Annelida have bodies consisting of many essentially similar ringlike segments (somites or metameres).This segmentation usually shows in both external and internal features, including muscles, nerves, and circulatory, excretory and reproductive organs. Phylum Annelida This phylum is divided into three classes: Oligochaeta: Earthworms - Most earthworms and their equals are inhabitants of damp soil and fresh waters. Hirudinea: Leeches - The leeches…

    • 516 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Phylum Echinodermata

    • 2833 Words
    • 12 Pages

    Phylum Echinodermata Introduction • Means “spiny skin” in Greek • Echinoderms are found at every ocean depth, from the intertidal zone to the abyssal zone. The phylum contains about 6500-7000 living species, making it the second-largest grouping of deuterostomes (a superphylum), after the chordates. • Echinoderms are also the largest phylum that has no freshwater or terrestrial (land-based) representatives. Defining characteristics: • A complex series of fluid-filled canals…

    • 2833 Words
    • 12 Pages
    Good Essays
  • Good Essays

    Phylum Chordata

    • 602 Words
    • 3 Pages

    Phylum Chordata • The chordates occupy the highest position in the food chain. • The name phylum was derived from the characteristic which all chordates share, the notochord – a long, elongated, and flexible cartilaginous structure that runs the entire length of the body. (Gr. noto = the back; chorde = string) Characteristics: • A dorsal nerve cord located above the notochord, it runs the entire length of the body. The nerve cord is a bundle of nerve fibers that connects the…

    • 602 Words
    • 3 Pages
    Good Essays