Pm porifera placozoa cnidaria ctenophora

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Unformatted text preview: Cycliophora Rotifera Annelida Mollusca Sipuncula Nemertea Brachiopoda Phoronida Bryozoa Arthropoda Tardigrada Onychophora Nematomorpha Nematoda Priapulida Kinorhyncha Loricifera Echinodermata Hemichordata Chordata ! ! Lophotrochozoa • Either presence of a U shaped gut and lophophore or • Trochophore larval stage ! ! “Lophophorates” • Lophophore • U-shaped gut Porifera Placozoa Cnidaria Ctenophora Platyhelminthes Gastrotricha Gnathostomulida Cycliophora Rotifera Annelida Mollusca Sipuncula Nemertea Brachiopoda Phoronida Bryozoa Arthropoda Tardigrada Onychophora Nematomorpha Nematoda Priapulida Kinorhyncha Loricifera Echinodermata Hemichordata Chordata BIO1130 Organismal Biology group that has one of two structures either locophore or trochophore larvae are related to each other but completely different another morphological state leading us down the wrong path complete gut and sitting on top of anus- problem because they are cessile with complete gut- ushaprd gut and the anus is next to the mouth very unusual- an either or characteristic in morphology cessile organism living within a calcarious case, trapping food with cilia and transeferring to mouth for ingestion complete digestive tract- u shaped gut undigessted residue is washed away tripoblasts-caelomes tentacles may be pointed may retract into calcarious case importance comes from the fact that they are associated with brozoan reeefs Page 20 Phanerozic - Paleozoic reef builders- Brozoans BIO1130 Organismal Biology 61 Université d’Ottawa / University of Ottawa 2:25 PM straightforward- fleshy set of tentacles covered in cilia tentacles trap food pass down towardsmouth and into digestive tract - becuas of position of anus-- swept away -tripoblast- able to move tentacles contract ot protect itself - feeding strcuture specific to this group another filter feeder. Bryozoa Lophophorates Ciliated tentacles Mouth BIO1130 Organismal Biology 62 Université d’Ottawa / University of Ottawa 2:25 PM ! ! Trochozoa (autapomorphie) • Presence of the trochophore larval stage Porifera Placozoa Cnidaria Ctenophora Platyhelminthes Gastrotricha Gnathostomulida Cycliophora Syndermata Annelida Mollusca Sipuncula Nemertea Brachiopoda Phoronida Bryozoa Arthropoda Tardigrada Onychophora Nematomorpha Nematoda Priapulida Kinorhyncha Loricifera Echinodermata Hemichordata Chordata BIO1130 Organismal Biology unique laravae found during the development of all 4 of these animals development- unique morphology Page 21 Phanerozic - Paleozoic shared by all 4 of htese phylum and that is why we know that they are related to each other. Trochophore larva Apical tuft Stomach Ciliary band Mouth Anus Figure 25-23 BIO3334 Invertebrate Zoology 64 Université d’Ottawa / University of Ottawa 2:25 PM 1 Animal innovations (symplesiomorphies) 1. Trochophore 2. Schizocoel, 3. Dorsal heart and pericardial cavity 23 Porifera Placozoa Cnidaria Ctenophora Platyhelminthes Gastrotricha Gnathostomulida Cycliophora Rotifera Annelida Mollusca Sipuncula Nemertea Bryozoa Brachiopoda Phoronida Arthropoda Onychophora Tardigrada Nematomorpha Nematoda Priapulida Kinorhyncha Loricifera Echinodermata Hemichordata Chordata schizocoel does not define the protostones only characteristic that defines a protosome is that the blastophore becomes the mouth **ASKING TO DEFINE PROTOSTOMES AND DEUROTOSTOMES** that is the only characteristic that defines them 3 autapomorphy- radula, shell and muscular foot - looking at charactersisitcs associated with repoduction, locomotiona and feeding what is the morphology of an original mollusc that makes it able to adapt to its setting Molluscs Trochozoa 66 2:25 PM BIO1130 Organismal Biology Page 22 Phanerozic - Paleozoic We must look at the characteristics on body plan and see how they are modified ventral service and ciliated foot Mollusc traits Mantle and shell Stomach and digestive gland Mantle cavity Gill Radula Foot only organism picking up sticky shit on top of surfaces BIO1130 Organismal Biology 67 Université d’Ottawa / University of Ottawa Mollusc radula 2:25 PM Radular teeth BIO1130 Organismal Biology 68 Université d’Ottawa / University of Ottawa 2:25 PM Snails (Gastropods) Gill Figure 25.25b Anus Mantle Digestive system Figure 25.22 Mouth Foot Radula- grinding structure- covered in teeth. sits on tongue chitinous set of teeth may slide relatively t the tongue. teeth move back and forth on substrate- sanding and creating particulate food to move along digestive tract -/ shell - if animal is attacked by predator, retractor muscles help protect - organism can defend itself against predation - water must still be able to circulate over gills - cavity underneath mantle that contains gills that move water into specific direction. Mollusc can feed on new feeding strategy and it may defend itself from other organisms or slug- slugs dont have she...
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