In miniturization collagenous cuticle epithial

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Unformatted text preview: udocoelom Nerve cord BIO1130 Organismal Biology Université d’Ottawa / University of Ottawa BIO1130 Organismal Biology 48 2:25 PM Page 16 Phanerozic - Paleozoic ! Porifera Placozoa Cnidaria Ctenophora Platyhelminthes Gastrotricha Gnathostomulida Cycliophora Syndermata Annelida Mollusca Sipuncula Nemertea Bryozoa Brachiopoda Phoronida Arthropoda Tardigrada Onychophora Nematomorpha Nematoda Priapulida Kinorhyncha Loricifera Echinodermata Hemichordata Chordata Panarthropoda (Autapomorphies) • Cuticle with chitin • Food manipulated by limbs ! ! Onychophora (Autapomorphies) • Oral papillae with slime glands • Body wall musculature continuous sheet • Unarticulated limbs ! Panarthropoda -chitin is now used as reinforcing structure - main structural carbohydrate - each appendage has different function -pick up food and manipulate and place inside digestive track -seletive choices -living fossil- relics of when pangea was put in one piece - biological evidence -partway into having a complete solid exosqueleton -flexible outer cuticle- hydrostatic squeleton Porifera Placozoa Cnidaria Ctenophora Platyhelminthes Gastrotricha Gnathostomulida Cycliophora Syndermata Annelida Mollusca Sipuncula Nemertea Bryozoa Brachiopoda Phoronida Arthropoda Tardigrada Onychophora Nematomorpha Nematoda Priapulida Kinorhyncha Loricifera Echinodermata Hemichordata Chordata -not worm -cuticle olted and made with chitin- first step along the way to arhropods Onychophora BIO3334 Invertebrate Zoology Université d’Ottawa / University of Ottawa BIO1130 Organismal Biology 51 2:25 PM Page 17 Phanerozic - Paleozoic Onychophora capturing prey with sticky gind of glue. Manipulating food before ingesting it -same way of hunting food before -precursor to centipede or millipede not entirely commited to a rigid skeleton missing articulated limbs -characteristic of arthropod Ecdysozoa Antenna Oral papilla Figure 25.35 Jaw Claw Video BIO1130 Organismal Biology 52 Université d’Ottawa / University of Ottawa 2:25 PM ! ! Arthropoda (Autapomorphies) • Articulated exoskeleton of plates • Muscles arranged in bands • Compound eye Porifera Placozoa Cnidaria Ctenophora Platyhelminthes Gastrotricha Gnathostomulida Cycliophora Syndermata Annelida Mollusca Sipuncula Nemertea Bryozoa Brachiopoda Phoronida Arthropoda Tardigrada Onychophora Nematomorpha Nematoda Priapulida Kinorhyncha Loricifera Echinodermata Hemichordata Chordata Body covered with cuticular plates - no longer expanded and contracted to be uses as hydrostatic articualtions trilobites- entirely extinct Some of large predators making explosions Arthropods: Trilobites Ecdysozoa Figure 25.37 BIO1130 Organismal Biology Video Université d’Ottawa / University of Ottawa BIO1130 Organismal Biology 54 2:25 PM Page 18 Phanerozic - Paleozoic appendages associated with each segement of the boudy because of musuclarture regions loo diffrent arthropods- segments fusesd to carry out common functions Arthropoda: Crustacea Ecdysozoa Cephalothorax (Head and thorax) Antenna Tail (Uropods and telson) Mouthparts Cheliped Walking legs Swimming legs (Swimmerets) Figure 25-40 BIO1130 Organismal Biology 55 Université d’Ottawa / University of Ottawa 2:25 PM small enough to be able to filter algal cells as crustaceans swim, it sends metachromal wave down the length of the body. Limbs move down length of the body. Cavity space reduces- water is jetted out at side - not padling water by itself propels animal forward water that is squirted out is not coming in from the sides but from the front of the animal. when boxes are moving back and forth little hairs- algae gets trapped on surface. Food groove leading to the head Filter feeding BIO1130 Organismal biology 56 Université d’Ottawa / University of Ottawa 14:25 microscopic in size to harvest microscopic algae to feed itself primary herbivore in oceans Arthropoda: Crustacea Ecdysozoa Top predator Fishes Large Phytoplankton (primary producers) Université d’Ottawa / University of Ottawa Invertebrates Small Zooplankton Primary consumers movement of limbs passes food up into mouth -agal matter out of the water column dominant form of all herbivores/ still dominant form now some organisms have ability to do the same- balean whale no modificaiton at any point in time no other arthropod from occean primary herbivores- oceans are delicate whole food chain could easily collapse Small Large Figure 47.9 Dissolved nutrients BIO1130 Organismal Biology 57 2:25 PM Page 19 Phanerozic - Paleozoic Food particles Three main protostome groups Water current Mouth Ecdysozoa Lophotrochozoa Anus Gut – Lophophore or – Trochophore larval stage Platyzoa Mouth Anus Cilia used in locomotion and feeding Figure 33-5 Figure 25-23 BIO1130 Organismal Biology 58 Université d’Ottawa / University of Ottawa 2:25 PM Porifera Placozoa Cnidaria Ctenophora Platyhelminthes Gastrotricha Gnathostomulida...
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