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International Congress of Zoology
Different locations every 4 years (started 1889) Experts share/discuss findings: animal behavior, genetics, classification Classify new organisms, reclassify old International codes for all forms of life Each has its own code for nomenclature International Code of Zoological Nomenclature (ICZN) Rules: Classify/name animals Use and cite names Tree of life – metaphor for showing relationships among organisms Two different species, same name or same species, two names Oldest valid publication – principle of priority 5.3 Classification of Biodiversity
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Carolus (Carl) Linnaeus – Swedish naturalist
Created naming system - consistency Binomial nomenclature two name naming system Latin/Greek in origin Objectives of binomial nomenclature: Myrmecophaga tridactyla 1. Unique name “eater of ants” “with three fingers” 2. Universal understanding First name: genus (capatilized) Second name: species (lower case) 3. Stability in system
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Identifying a New Species
Describe new species Describe location found in Name species based off the appropriate International Code Place sample in public location for other scientists to study can confirm Publish findings in public accessible publication Holotype Precise illustration sometimes acceptable
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Three Domains All living things can be categorized into one All other life (membrane bound organelles) Single celled organisms to largest on the planet Common bacteria Makes yogurt Digest food Cause infection Single-celled organisms (distinct from bacteria) – very ancient Thrive in extreme environments Note: viruses not included – not considered alive Salt loving Heat loving Methanogens: methane-loving
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Other classifications:
Feeding habits Habitat Daily activity Risk anatomy Plantae Animilia Angiospermphyta Chordata Dicotyledoneae Mammalia No one correct way Clear, consistent, logical, easily implemented, general consensus Rosales Primate Papilionaceae Hominidae Pisum Homo sativum sapiens
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Common Ancestral Species
Old: observable characteristics New: DNA sequences or derived characteristics Narrow down to genus - find similar species Denotes extinct ancestor Reclassification has occurred due to genetic connections Genetic differences leads to evidence that species evolved from a certain ancestor Challenges to reclassification: Updating resources Agreement to make the change across scientific community
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Natural Classification
Uses ancestry to group organisms Reasons: Make sense of biosphere Show evolutionary links Predicts characteristics shared by members of a group Diet Lifespan Enzyme production Cell structure biochemistry Using DNA – back trace what last universal common ancestor (LUCA) what like
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Bryophyta Filicinophyta only non-vascular plants Vascular plants Produce spores, transported by rainwater or ground humidity Produce spores, transported by rainwater or ground humidity Coniferphyta Angiospermphyta produce woody stems, have needles or scales flowers and fruits with seeds Pollination via animals, produce seeds, flowers are reproductive organs, fruit is the enlarged ovary Use wind to reproduce via pollination, produce seed cones with seed scales
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Invertebrates Porifera Cnidaria Sessile: stuck in place No mouths or digestive tracts Feed by pumping water through their tissues, filter out food No muscle or nerve tissue or distinct internal organs Corals, sea anemones, jellyfish, hydra, floating colonies All have stinging cells: nematocysts Some are sessile, others free-swimming, or both Catch food in tentacles Use gastric pouch with only one opening
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Invertebrates Platyhelminthes Annelida Flatworms have only one cavity A gut with one opening: food in, waste out No heart or lungs Flat shape: all cells need to be close to the surface for gas exchange Earthworms, leeches Segmeneted: bodies divided up into sections separated by rings Bristles Gastric tract with mouth at one end, the intestines have an opening at the other
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Invertebrates Mollusca Arthropoda Aquatic Snails, clams, octopuses Produce shells using calcium Bodies are not segmented Hard exoskeleton made with chitin Segmented bodies Limbs can bend because of joints Insects, spiders, scorpions, crustaceans True champs at diversity, found in most habitats
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Chordata (vertebrates)
Organisms with notochord at some point in development Fish Very diverse aquatic habitat Gills to absorb oxygen Bone/cartilage skull jaw/teeth (usually) Can have limbs, but not digits Cartilage line provides support
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Vertebrates Amphibians Reptiles Frogs, toads, salamanders Start lives in water (tadpoles) Gills lungs Semipermeable skin Wide variety of diet Eggs do not have membrane around embryo Ectothermic (cold-blooded) Snakes, lizards, turtles, alligators Amniote eggs Has membrane around developing embryo Scales ectothermic
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Vertebrates Birds Mammals Bipedal, possess wings Feathers Lay eggs with hardened shells Lightweight skeleton (hallow bones) Beaks (no teeth) Build nests High heartbeat and breathing rates – high metabolism Hair on bodies Females produce milk in mammary glands 5500 known species – most have 4 limbs Most adapted to land Some adapted to water (whales, dolphins) Thermoregulation
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Dichotomous Key Using characteristics which help identify unknown species Using a Dichotomous Key Look at first section which has a pair of sentences describing a characteristic Look at the organism and which characteristic it has Go to the appropriate number following the chosen characteristic and continue. Go until the end of the line has a name and not a number this is your organism
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