comparison chart

comparison chart - Phylum Choanoflagellata Class (if...

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Phylum Class (if applicable) Adaptive Zone # of Species Characteristics Notes Choanoflagellata Marine and freshwater spp. 150 o Flagellated Protozoa (single celled) o 5-10 micron o Flagellum surrounded by collar o Most sessile o Some colonial o No fossil record Proterospongia Freshwater, colonial o Multiple cells in jelly-like matrix o 2 cell types (collar and amoeboid) o Collar cells feed, amoeboid duplicate Phylum Class Adaptive Zone # Species Characteristics Notes Placozoa 1- Trichoplax Adhaerens o Discovered in an aquarium o 2-3 mm o Simplest of animals few thousan d cells 4 cell types Smallest known animal genome
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Transparent, flat, round Ventral side (ciliated cylinder cells and gland cells) Dorsal side (cover cells) Move w/ cilia or change shape Reproduce asexually, some sexual nature 2 cell layers Porifera Mostly marine, benthic - few fresh water sp (only demospongiae) Live at all depths > 10,000 few mm-few m Long fossil record (from Ediacaran Simple animals - No tissues/organs - Few cell types - Asymm etrical Sessile organisms Suspension feeders Spicules - skeletal structures - composi tion, size, shape important for Body Forms - ascon oid - Sycon oid - Leuc onoid Maj. Cell types - Pinaco cytes- flattened cells orming protective layer surrounding sponge - Poroc ytes- cylindrical cells froming incurrent pore structure of sponge
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taxonomy - calcareo us or siliceous - bath sponges- no spicules Sexual Reproduction - Most hermaphrodites - Many modes: sequential hermaphrodism, dioecy, alternation of sex - Larvae= ciliated ball of cells Asexual Reproduction - Budding - Fragme ntation - Re- aggregation - Gemmu les (freshwater) Importa nt reef builders - Domina te benthos (sometimes ~ 75% biomass) - Some dominant competitors (growth >20 mm/mo.) - Choan ocytes- current generating, food collecting cells (collar cells) - Archa ocytes- amoeboid cells for food transport, skeleton formation, cellular replacement Toxin s (by endosymbionts or sponge) - Medic inal applications: Antitumor agents, andibiotics, antifungal agents
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Some excavate substrates (boring) Calcarea All marine All 3 body plans Calcare ous spicules (3-4 rays) Mostly dull colored Known from Cambrian to now Hexactinellid All marine Mostly deep water Many cylindrical Siliceous spicules (3-4 rays) Demospongia Most marine, some fresh Leuconoid body type ~ 90% of sponges Siliceous spicules (not 6 rayed) Many brightly colored Cnidaria Mostly marine Some fresh Carnivorous- predators Live @ all depths 11,000 living spp. Nematocysts (Cnidae) Polyp-medusa life cycle Many fossils, 1 st may be in Ediacaran Fossil reefs in ordovician, extinct in end of Permian New reef group mid-triassic Radial symmetry 2 tissue layers - ectoder Gastric cavity for gas xchange & digestion No circ. System (gastric
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This note was uploaded on 04/15/2008 for the course EEMB 112 taught by Professor Kuris/oakley during the Fall '07 term at UCSB.

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comparison chart - Phylum Choanoflagellata Class (if...

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