An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

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Introduction to Invertebrates Laboratory 27 & 28

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Transcript of An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Page 1: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to InvertebratesLaboratory 27 & 28

Page 2: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

An invertebrate is an animal without a backbone.

The group includes 95% of all animal species

Page 3: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

There is no escaping the invertebrates! Sharing space on your face

Page 4: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introdcution to Invertebrates

Animals are distinguished by their body cavity or lack of.

http://en.wikipedia.org/wiki/Image:Body_cavities.svg
Page 5: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

Acoelomates› lack a body cavity (coelom)› bilateral symmetry › one internal space, the digestive cavity

Page 6: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

Coelomates have a body cavity(s)

Digestive system and body wall can move independently

Internal organs can be more complex

Coelomic fluid can assist with respiration, circulation, excretion

Page 7: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

The good the bad and the ugly!!!

Page 8: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

Phylum Porifera Phylum Cnidaria Phylum Platyhelminthes Phylum Mollusca Phylum Annelida

Page 9: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

Phylum Porifera Sponges

Sessile aquatic animals

Some are freshwater species, most are marine

shapes of their bodies are adapted to maximize the efficiency of the water flow

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Page 10: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

Phylum Cnidaria› (pronounced nidaria/ with a silent c)

› phylum containing over 9,000 species of animals found exclusively in aquatic and mostly marine environments

Jellyfish Hydra

Page 11: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

Phylum Cnidaria Two basic body forms are seen : swimming medusa and sessile polyps

Page 12: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

Phylum Cnidaria › Their distinguishing feature is a cnidocyte,

specialized cells that they use mainly for capturing prey.

Page 13: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

Phylum Cnidaria Have no brains or central nervous systems

Instead they have nerve nets that generate signals in response to various types of stimulus, such as odors

Page 14: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

Phylum Platyhelminthes Flatworms

› Planarian › Fluke› Tapeworm

no specialized circulatory or respiratory organs

Over half of all known flatworm species are parasitic, and some do enormous harm to humans and their livestock

oxygen and nutrients to pass through their bodies by diffusion

Page 15: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

Phylum Platyhelminthes

Taenia solium

Page 16: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

Phylum Mollusca› Considered coelomates

Coelom is limited to space around the heart

Page 17: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

Phylum Mollusca

Page 18: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

Phylum Mollusca

Page 19: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

Phylum Mollusca

Page 20: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

Phylum Mollusca› Respiratory system –gills› Digestive system – starts with Radula

Page 21: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

Phylum Mollusca

Page 22: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates Phylum Mollusca

Page 23: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

Cool Squid Stuff to look forDuring dissections

Page 24: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

Phylum Annelida Segmented Most have a pair of coeloms in each segment which allows independent movement

Coelomatic fluid

*Moist environments

Page 25: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates› Phylum Annelida › Respiratory system

(usually) no specialized organs for gas exchange Thin, permeable body wall – surface for gas exchange

› Digestive system complete digestive system, with mouth and anus digestive tubes of earthworms have special structures, like a muscular wall

and a gizzard-peristalsis

Page 26: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

› Phylum Annelida › Nervous system

two ventral nerve chords one relatively big nervous cell concentration

› Circulatory system› Closed› Move by peristalsis -waves of contractions and expansions› 2 main vessels

Dorsal moves blood anterior Ventral moves blood posterior

10X magnificati

on

Page 27: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

› Phylum Annelida › Reproductive system – Varies

Asexual-budding

Sexual Earthworms

hermaphrodite

Page 28: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates

Phylum Annelida

support terrestrial food chains both as prey

aerating and enriching soil

Minnesota? Leeches ?

Page 29: An invertebrate is an animal without a backbone. The group includes 95% of all animal species.

Introduction to Invertebrates Dissecting the earthworm

FOLLOW DIRECTIONS in your lab book

Allow 20 minutes


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Animals. Animal Types All animals are grouped as either an invertebrate or a vertebrate. – 95% of all animals are invertebrate organisms. The animals.

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