Sponges have multiple cell types that are geared toward executing various metabolic functions. Phylum porifera definition of phylum porifera by the. This skin has lots of small pores and a few large openings. Phylum echinodermata slow moving or sessile doesnt move, thin skin with spines covers a hard bony exoskeleton, water vascular system with tube feet. The phylum porifera contains all the species of sponges. Rolando gelabert fernandez phylum porifera phylum cnidaria phylum platyhelminthes plylum annelida phylum molusca phylum arthropoda phylum ectoprocta phylum echinodermata phylum chordata alumna. Calciespongiae calcarea, demospongiae y hexactinellida. Descargue como pdf, txt o lea en linea desde scribd. Phylum porifera and cnidaria animal biology 110 with raines at colorado state university fort collins studyblue flashcards. Although the majority of sponges are marine, some species live in freshwater lakes and streams. Porifera are most commonly asymmetrical but can also have radial symmetry. Choanocyte flagellated collar cell the flagellated collar cell. The small openings are the entrances to a complex system of channels.
Pinacocytes, amoebiod mesenchyme, and choanocytes central cavity, or a series of branching chambers that water circulates during filter feeding no tissue or organs cell types. The simplest of all the invertebrates are the parazoans, which include only the phylum porifera. Introduction to phylum porifera lowest multicellular animals or metazoans without true tissues, i. Choose from 500 different sets of porifera flashcards on quizlet. These characters allow the sponge to overcome stressing en vironmentalclimatic conditions. Porifera definition of porifera by the free dictionary. In the lesson called phylum porifera reproduction, you can go over more information about how sponges reproduce. Atkinson lj and sink kj eds field guide to the ofshore marine invertebrates of south africa, malachite marketing and media, pretoria, pp.
Most sponges prefer relatively shallow water, but some groups including most glass sponges, live in deep water. Phylum porifera and cnidaria animal biology 110 with raines at colorado state university fort collins. Phylum porifera definition of phylum porifera by the free. Study 47 phylum porifera and cnidaria flashcards from linea l. Sponges sponges are considered the oldest animal group. Specifically, you can do these tasks by the end of it. Atkinson lj and sink kj eds field guide to the ofshore marine invertebrates of south africa. Sponges are simple invertebrate animals that live in aquatic habitats. Traditionally, in botany the term division has been used instead of phylum, although the international code of nomenclature for algae, fungi, and plants accepts the terms as equivalent. Sessile metazoans possessing inhalant and exhalant pores connected by chambers lined by choanocytes. Sponges over 7,000 species, approximately 40 species that occur in local waters 2% of all sponges are freshwater, none are terrestrial. The group of organisms known as sponges porifera is considered the earliest branching group of metazoans, or animals, with fossils described from the vendian period, dating back 650543 million years ago porifera. A unique innovation in porifera that evolved from the cathepsin l family of proteins, it has been reported that two amino acids s and h are necessary to form the catalytic triad shn to enable.
Phylum porifera and cnidaria animal biology 110 with. Phylum porifera the shape of life the story of the animal. Sponges arose 550 million years ago in the pre cambrian period, evolving from colonial. In contrast, the complexity of metazoans or multicellular animals. Apresentar as caracteristicas do filo porifera, suas caracteristicas morfologicas, fisiologicas e sua evolucao. Phylum porifera, or the sponge, is entirely aquatic, with over 98 percent living in the ocean, and the rest living in freshwater lakes and streams, according to biomedia associates. Description, classification, synonyms of phylum porifera sponges. Collar cells exist in other phlya but they are not flagellated. These organisms show very simple organization, with a rudimentary endoskeleton. The higher classification of the porifera is considerably confused by different experts preferring different schemes. Depending on definitions, the animal kingdom animalia or metazoa contains.
It is the only phylum of the animal subkingdom parazoa and represents the least evolutionarily advanced group of the animal kingdom. Phylogeny in this phylum, or group of organisms, is an ongoing debate, with the current consensus viewing. The best i can do is to offer two different schemes to give you some idea of the problems, either one is satisfactory for secondary schools and beyond that you should consult your teacher or lecturer unless you would become a. Porifera have no real body layers but they do have 2 cell layers.
Parazoans beside animals do not display tissuelevel organization, although they do have specialized cells that perform specific functions. They found in all seas, wherever there are rocks, shells, submerged timbers, or coral to provide a suitable substratum. Sea stars, sea urchins, sand dollars and biscuits, sea cucumbers, etc. Porifera synonyms, porifera pronunciation, porifera translation, english dictionary definition of porifera. Porifera authors touiek samaai 1, robyn payne2, seshnee maduray, and liesl janson citation samaai t, payne rp, maduray s and janson l. The sponge serves an important purpose in filtering bacteria and other contaminants from water, and it forms a significant portion of coral reefs. Porifera article about porifera by the free dictionary. They are multicellular but dont have tissues or organs the name porifera means pore bearer in latin a pore is a tiny hole. Phylum porifera the word porifera means organisms with holes. The phylum porifera include more than 5000 animal species, mostly marine, but includes about 150 fresh water inhabitants also.
This also makes porifera the simplest in form and function. Asymmetrical or superficially radially three cell types. Phylum porifera the shape of life the story of the. Porifera cellular level of body organization middle layer mesohyl. From the latin porus for pore and ferre to bear, hence an animal with with pores. A sponges body is covered by a skin, one cell thick. Porifera use canals and pores diffusion to perform life functions. They are found in shallow ocean environments to depths as great as five kilometers km. This, the first paper on a series on the current knowledge of the marine biodiversity of costa rica, covers the phylum porifera, the sponges. The invertebrates, or invertebrata, are animals that do not contain bony structures, such as the cranium and vertebrae. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jellylike mesohyl sandwiched between two thin layers of cells.
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