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Week 8 Lecture

by: Mackenzie Thompson

Week 8 Lecture BIOL 112 101

Mackenzie Thompson
Texas A&M
Biology 112
William Wardle

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About this Document

Detailed notes of week 8 lecture
Biology 112
William Wardle
Class Notes
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This 6 page Class Notes was uploaded by Mackenzie Thompson on Tuesday October 27, 2015. The Class Notes belongs to BIOL 112 101 at Texas A&M University taught by William Wardle in Fall 2015. Since its upload, it has received 33 views. For similar materials see Biology 112 in Science at Texas A&M University.


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Date Created: 10/27/15
10202015 Ph Mollusca l Mollusks mollis soft o Gills are part of respiratory system 0 Highly vascularized provided with tubes and capillaries Allows for greater intakeoutput of gases Circulatory System 0 Open system 0 BlOOd i5 Clear I Mollusks are the rst 39 HaemOCyanln species to have 0 Excretory System complete circulatory o Removes impurities especially and excretory systems nitrogen o Balances pH 0 Balances salt Digestive and Reproductive systems 0 Split between being either dioecious or hermaphroditic o Trochophore larva l veliger larva l juvenile adult Mollusks are Divided into 8 Classes We ll only look at 4 1 Cl Polyplacophora l quotmany plate bearerquot chiton 0 Shell is divided into 8 separate plates that overlap each other 0 All marine Rock dwellers like nooks and crannies 2 Cl Gastropoda l Snails Torsion veliger larva stage Limpets shell is conical not coiled Slugs o No shell 0 Mantle cavity is forward 0 Most successful 0 Marine environment and freshwater terrestrial o Freshwater no larva stage 0 Terrestrial developed a lung 3 Cl Bivalvia l 2 half shells Adductor muscles 0 Relaxed vs contracted Decephalization reduced head 0 Only class to get rid of radula Filter feeders Gills serve as feeding organs 0 Filter feeders Digging foot hatchet shaped o Aquatic marine and freshwater o Freshwater don t have a larva stage 0 Bivalves include o Clams o Muscles O O Oysters ScaHops 4 Cl Cephalopoda l head foot 0 Foot divided into 0 O Arms tapered double row of suckers Tentacles long uniform Octopus don t have tentacles only squid 10222015 Ph Annelida l Annelid Worms Coelom present Circulatory excretory system respiratory system Divided into 3 classes 1 Cl Polychaeta l quotmany setaequot bristles O O O O 0 00000000 0 Mostly marine Some carnivorous some lter feeders Carnivorous above substrate Filter feeders below substrate Dioecious and hermaphroditic species Oligochaeta l quotfew bristlesquot No parapodia Reduced heads No mouth parts or antennae quotEarthwormsquot Terrestrial few freshwater species Castings sediments and organic waste Bene cial to plant growth No larvae Most hermaphroditic 3 Cl Hirudinea l Leeches Adults have exactly 34 segments Facultative predators Parasites of vertebrates Aquatic marine or freshwater Mostly live on bottom Anesthetic and anticoagulant dispersed by glands OOOOOO when they attach also kills bacteria Very clean used in medicine to eat bacteria Swells when quotfullquot and drops off host 0 Direct development no larva stages 0 Parasitize sh mammals birds reptiles O amphibians Lophophorate Phyla Bryozoa Phoronida Brachiopoda o All marine o All have cilia and mucus on tentacles Tentacles used for feeding Clade Ecdysozoa l quotmolting animalsquot 0 Body covered with a cuticle made of collagen or chitin 0 Cannot grow with cuticle so they molt ecdysis and quickly grow and eat to regrow shell Amoeboid sperm cells 0 No trochophore or lophophore larva 1 Ph Nematoda l quotthread bearersquot o Parasitic Parasitizes horses 0 Free living and parasitic species Parasitic don t have antennae or eyes Dioecious with sexual dimorphism Reproduction called copulation One of the most abundant species of benthic marine species Marine and freshwater some terrestrial Over 500000 species Humans gt Pinworms mostly affects children gt Hookworms deadly live in soil gt Porkworms trichinosis I pigs gt Guinea worms 2 Ph Arthropoda l quotjoint legsquot Largest of all animal phyla Abundant in all habitats quotDominant organismquot on Earth Covered by a cuticle of chitin 3 part segmented body Subphyla Crustacea l crustaceans 0 Mostly marine some freshwater few terrestrial Terrestrial include land crabs and pillbugs rollie pollies o 2 pair of antennae o Appendages are branched l bi ramous appendages Examples Copepodsljzooplankton Barnacles o BenthicNeustonic Benthic attach to bottom Acorn barnacles Neustonic attach to that s using a stalk Gooseneck anything moving barnacles


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