Most aquatic but includes terrestrial pill bugs and

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Most aquatic But includes terrestrial “ pill bugs” and others Many appendages, some abdomen Subphylum hexapoda- 3 pairs of feet. Class insecta- butterflies,bees, beetles Mostly terrestrial or freshwater Phylum Echinodermata “Spiny skin” Sand dollars, sea urchins, sea star Most slow-moving or sessile Marine Adults-near-radial symmetry Bilateral larvae ( cnidarians nerve bilateral) Spines-extension of calcareous endoskeleton Move using water vascular system
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Phylum Chordata 4 distinct features in embryos ( some adults) Dorsal hollow nerve cord notochord - flexible, supportive, rod between digestive tract and nerve cord Pharyngeal slits or clefts Post anal tail ( past the anus ) Subphylum cephalochordata ~~ cephalo= head ex lancelets ( amphioxus) Small blade-like invertebrate chordates Live in marine sand or mud Subphylum urochordata Ex tunicates ( sea squirrels ) Generally range from 1mm to 60 cm fig 34.5 Sessile filter feeders notochord , most of nerve cord, and tail reabsorbed as adults Pharyngeal slits- used for feeding Subphylum vertebrata Jawless fish, cartilaginous skeleton, reduced vertebrate Class myxini ( hagfish) “Myx”= slim fig 34.89 Mixing my slimes slimes Largely marine scavengers Produce an abundance of slime for protection Class petromyzontidae- lampreys “Petra” stones “meyzo” to suckle odontos “teeth” Parasite of great lakes fisheries Streams treated since 1960s to reduce pops Phylum chordata Agatha “without jaw” To Gnathostome “jaw mouth” Subphylum vertebrata class chondrichthyes, sharks, skates, rays Cartilaginous skeleton
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Notochord replaced by vertebrate Have lateral line system- sense pressure, vibrations. Bony fish Swim bladder- buoyancy ( ability to float in water) ex lungfish. class actinopterygii ray finned Ray finned fish- bass, trouts, perch, tuna Class sarcopterygii “ flesh fish” Lobe -finned fish ex coelacanth Lungfish- gulp air into lungs helps them breathe underwater. Survive dry periods by digging into mud and enter a state of torpor- a state of doing nothingness? Lower metabolic state similar to hibernation. Tetrapods- four legged. Tiktaalik - transitional species Fish like: head fins gills lungs and scales Had ribs neck shoulders, limbs-like bone structure Class amphibia- Amphibians both on land and water. “Both ways of life” Aquatic larvae stage, many adults are terrestrial Salamanders, newts, frogs, toads, Class Reptilia Mostly terrestrial tetrapods Skin has rough scales with keratin Snakes, lizards, turtles, crocodiles, and birds.
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  • Fall '19
  • phloem, Phylum

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