The name Cnidaria comes from the Greek word “cnidos‚” meaning stinging nettle. There are about 9‚000 species of cnidaria‚ the most common being the jellyfish‚ sea anemone‚ and coral. Cnidaria come in two different body forms: free-floating or free-swimming form such as the jellyfish‚ and the stationary form such as the sea anemone. Both forms consist
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closest‚ living‚ unicellular relatives of animals” (Leadbeater). The phylum Prorifera has the ability to be asymmetrical and to reproduce by budding‚ but lacks true tissue. True tissue was the next evolutionary adaptation that is present in phylum Cnidaria. Multicellularity and the presence of true tissue are indicators
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01/28 Domain: Eukarya “Eu karyotic Protist Supergroups” 1. Supergroup Excavata Genus – Euglena Tryponsoma 2. Super group Chromolaveolata a. Ceratium b. Plasmodium c. Paramecium d. Laminaraia 3. Super group Archaeplastida a. Red Algae “ Polysiphonia” b. Green Algae “Chlamydomadas‚ Hydrodictyon‚ Spirogyra‚ Volvox” 4. Unikonta a. Amoeba b. Some other small creatures that have flagella Pro – No membrane‚ No Histone‚ They have a cell wall‚ unicellular Super groups in Eukarya domain:
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cavity‚ Coelomic cavity. 3. Segmentation(most are Coelomic‚ only mollusks are not). 4. Protostomes and Deuterostomes( both are bilateral‚ Coelomic and segmented organisms). Phylum: Porifera-The sponges------------------------Parazoans Phylum: Cnidaria-jellyfish‚ anemones‚ coral------Eumetazoans with radial symmetry. Phylum: Platyhelminthes-The flat worms----------Bilateral symmetry with acoelomic cavity. Phylum: Nematoda-The round worms--------------Pseudocoelomic cavity. Phylum: Mollusca-Gastropods/Bivalves/Cephalopods------Coelomic
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There are no multicellular plants in the oceans Most are photosynthetic single cells Cambrian is in Paleozoic era Called Cambrian explosion‚ because in this 70 million years. We have an explosion of every multicellular organism. Wednesday October 31st‚ 2012 CAMBRIAN Phanerozoic Eon Eras: Paleozoic (most recent : 550 Ma until now) – multicellular organisms in the oceans The periods in the Paleozoic era are: Cambrian Ordovician: end is one of the 5 mass extinctions. So many organisms
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genomes of existing phyla. It said that when multicellular animals emerged it made a radical increase in genome complexity in gene number and appearance of entirely novel gene families. In addition the primitive roundwarm had about 19‚000 genes‚ cnidaria with 20‚000‚ and lastly the sea urchin with 24‚000. It also stated that the families of genes are genes that has a relation with the body plans‚ organ development and cell-cell communications. This apparently means that the families of genes are
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ancestors were of this type Evidence that animals arose from choanaflagellate ancestor DNA sequence is most similar of protist animals Some animals have choanoglagellate-like cells in their anatomy Eg. Sponges-choanocytes=feeding cells Also Cnidaria(flat worms) have choanoflagellate-like cells Animals come from a colonial form (since they are multi-cellular) Land plants evolved from PROTIST ancestor Supergroup: Archaeplastida Closest protist relative to land plants= charophyceans of
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as in fact‚ they are not one at all! Their name may suggest a relation‚ which is partially true as they are very distant relatives‚ but comb jellies are completely harmless to humans‚ and both belong to an entirely different phyla‚ jellyfish being Cnidaria and comb jellies being Ctenophora. While both species are exceedingly ancient‚ having roamed the seas for over 500 million years‚ the pair also possess relatively different histories. It’s said that roughly 100-150 species of comb jellies have been
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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‚
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Most animal phyla originated in a relatively brief span of geological time‚ however the diversity among them is extraordinary. Every organism is very unique a detailed in certain ways‚ comparisons of certain types of organisms can be very difficult. The class in which will be compared is that of the invertebrates. The main difference between coelomate and acoelomate body plans are that coelomates have a true coelom‚ which is a fluid-filled body cavity completely lined by tissue which is derived
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