3 General Features of Animals and Evolution of the Body Plan
4 General Features of Animals Heterotrophs Multicellular No Cell Walls Active Movement Diversity in Form and Habitat Sexual Reproduction Embryonic Development Unique Tissues
5 Key Evolutionary Developments Evolution of Tissues Evolution of Symmetry Types Evolution of the Body Cavity Evolution of Developmental Patterns Evolution of Segmentation
6 Tissues Tissues allow for Specialization and Differentiation Only the Parazoa do not have specialized tissues Even the Parazoa have cell-level specialization
7 Symmetry Parazoa are again the exception. Radial Bilateral
8 Body Cavity Most animals produce 3 types of tissue Bilaterally Symmetrical bodies follow three basic plans
9 Circulatory System As body sizes increases the need to move fluid becomes active and we see the evolution of a circulatory system Open Circulatory System Closed Circulatory System
10 Spiralians vs. Deuterstomes
11 Traditional Taxonomy of Animals
12 Parazoa vs. Eumetazoa Traditional taxonomy differentiates between the near animals (Parazoa) and true animals (Metazoa) Parazoa lack true differentiated tissue and symmetry
13 Molecular vs. Morphology On many groupings traditional morphology methods agree with molecular data. Morphology taxonomy is based on the presence or absence of the coelom. Molecular taxonomy is based on the genetics of differentiation End Result: While there is concurrence, molecular data shows that the coelom developed a number of times.
14 Roots of the Animal Family Tree
15 Where did we come from? Multinucleate Hypothesis Colonial Flagellate Hypothesis Molecular Data supports the Colonial model.
16 Noncoelomate Invertebrates Chapter 33
17 The New Invertebrate Phylogeny
18 Parazoa Animals That Lack Specialized Tissues
19 Dominant group of the Parazoa These are the Sponges Lacking true symmetry or tissues While the adults are sessile, the larval stage is motile. Porifera
20 Cell Types
21 Look Familiar?
22 Eumetazoa Animals with True Tissues
23 Phylum Cnidaria Distinct Specialized Tissues Mostly Marine in Nature No Organs Primitive Sensory System
24 Cnidaria Body Plans Polyp vs. Medusa Mesoglea glue material between the epidermis and gastrodermis Gastrovascular Cavity
25 Cnidaria Specialized Tissues
26 Cnidaria Life Cycles Life Cycles vary by species, but can include both a polyp and medusa stage or only one. Individuals are diploid tissue and sexual haploid gametes are produced, sexes can separate. The diploid zygote develops into a larval planula Asexual reproduction is also possible.
27 Nematocysts Defining characteristic of the phylum Used to incapacitate and acquire food Expulsion is one of the fastest known biological processes.
28 Major Groups of Cnidaria Class Anthozoa Sea Anemone and Corals Class Cubozoa Box Jellies Class Hydrazoa Hydroids Class Scyphozoa Jellyfish Class Staurozoa Star Jellies You should learn a defining characteristic of each
29 Phylum Ctenophora Surface similarity to the Cnidaria is not borne out. They do not possess nematocysts and possess an anal pore. They possess colloblasts for prey capture They possess mesoderm tissue
30 The Bilaterian Acoelomates
31 Phylum Platyhelminthes Flatworms Incomplete Guts Complex systems Cephalized
32 Platyhelminthes Groups Class Turbellaria* Free-Living Flatworms Subphylum Neodermata Parasites Possess a Neodermis and lack Eyepores Comprised of two Subgroups Trematodes Flukes Cercomeromorpha - Tapeworms
33 Schistosoma Life Cycle
34 Tapeworms Body divided into three sections Scolex Neck Proglottids No digestive systems
35 Acoel Flatworms Distinct from Flatworms Convergent Appearance Lack digestive cavity Primitive nervous system Uncertain position
36 Phylum Cycliophora Near Microscopic Live in the mouthparts of Claw Lobsters Sexual cycle is linked to Lobster molt
37 The Pseudocoelomates
38 Pseudocoelm A body cavity isolated from the exterior environment Serves as a hydrostatic skeleton Serves as a circulatory system Evolved numerous times
39 Phylum Nematoda Roundworms Possess a cuticle that they molt Developed digestive and reproductive systems Lack circular muscles
40 Nematoda Anatomy
41 Nematoda Life Cycle Most are gonochoric and exhibit sexual dimorphism Development is often indirect (larval to adult) Eutely (a precise number of cells) is common and allows for determination of cellular development in some species.
42 Nematoda Diseases
43 Phylum Rotifera
44 Coelomate Invertebrates Chapter 34
45 Phylum Mollusca
46 Phylum Mollusca
47 Mollusca Characteristics Extremely varied in body plan and appearance. Coelom is reduced and the role replaced by a shell in many. Highly efficient gas exchange system Most mollusks possess a radula Most posses open circulatory systems
48 Class Polyplacophora: Chitons Marine species Covered in shell plates Grazing animals Modified foot that serves as an anchor against predators.
49 Class Gastropoda Snails and Slugs Most adults are not bilaterally symmetrical due to torsion. Numerous predatory adaptations Evolution of a primitive lung.
50 Class Bivalvia Clams and such No radula or cephalization Extremely agile while digging or swimming Two shells
51 Class Cephalopoda Octopuses, squids, and nautiluses Highly divergent and specialized body plan Largest relative brain sizes of invertebrates Direct development Highly advanced eyes
52 Phylum Annelida
53 Annelida Characteristics Body Segmentation Cephalized with developed brains Head and Tail develop first, then the internal segments develop Segments are separated by septa, but communicate between the sections. Most possess chaetae Circulatory system is closed, but excretory system is segmented.
54 Possess paired fleshy parapodia Class Polychaeta
55 Class Clitellata Earthworms and leeches Named for the clitellum, a thicken saddle around the worm.
56 Hirudo medicinalis
57 The Lophophorates Bryozoa and Brachiopoda
58 Lophophore Defining characteristic of these Phyla A circular or U-shaped ridge around the mouth bearing one or two rows of ciliated tentacles into which the coelom extends.
59 Phylum Bryozoa Exclusively colonial Specialized members within the colony Can produce structures much like coral.
60 Phylum Brachiopoda Possess a U-shaped digestive system Solitary animals Possess hardened mantles or chitinous sheaths.
61 Phylum Anthropoda
62 Key Features of Arthropoda Segmentation Exoskeleton Jointed Appendages Circulatory System Nervous System (central and diffuse) Respiratory System Excretory Systems
63 Segmentation, Exoskeleton and Joints
65 Class Chelicerata Spiders, mites, ticks, and horseshoe crabs, etc. Defined by the chelicerae, pedipalps and four pairs of walking legs Two body segments
66 Class Crustacea Crabs, Lobsters, Pill Bugs, etc. 2 pairs of antennae, 3 pairs of feeding appendages, and various legs They have appendages on the abdomen.
67 Class Hexapoda Mandibles Three body regions One pair of antennae Thorax has three segments, each with a pair of legs Wings are derived from outgrowths, not legs
68 Class Myriapoda Having a myriad of legs Mandibles A head with various segments Each segment contains a pair of legs. Segments can be added as they grow.
69 Phylum Echinodermata
70 Characteristics Adults are pentaradially symmetrical, but larval forms are bilaterally symmetrical They possess an endoskeleton (the things you usually buy at gift shops) Water-Vascular System Regeneration
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