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Animal Diversity I BIOB 171

Animal Diversity I

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Animal Diversity I. BIOB 171. Background. Domain Eukarya , Kingdom Animalia Heterotrophic – obtain food by ingesting other organisms or their by-products Lack cell walls Pass through a blastula stage  Arose approx. 620 - 550 mya 35 major groups (we will look at 9). Parazoa. - PowerPoint PPT Presentation

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Page 1: Animal Diversity I

Animal Diversity I

BIOB 171

Page 2: Animal Diversity I
Page 3: Animal Diversity I

Background

• Domain Eukarya, Kingdom Animalia

• Heterotrophic – obtain food by ingesting other organisms or

their by-products

• Lack cell walls

• Pass through a blastula stage

• Arose approx. 620 - 550 mya

• 35 major groups (we will look at 9)

Page 4: Animal Diversity I

Parazoa

Rotifera??

Page 5: Animal Diversity I

Eumetazoa• All multicellular animals

• Organisms in this group have either radial or bilateral symmetry

Page 6: Animal Diversity I

Two developmental trajectories in Eumetazoa:

That’s us!

Page 7: Animal Diversity I

Hydras aren’t any of these…. Super simple design with 2 layersRotifers are pseudocoelomate

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Protostomes

• Two large groups:– Lophotrochozoa – The name is based on the trochophore larva found in

within this group. Includes annelids, molluscs, flatworms, and maybe rotifers– Ecdysozoa – Animals in this group undergo molting (ecdysis) or the shedding

of an outer body cover. Includes roundworms, nematodes, arthropods (like insects, and more).

Page 9: Animal Diversity I

Today…We will be looking at these organisms…

– Hydra (Cnidaria)

– Rotifers (Rotifera)

Why? Because the lecture needs to catch up to the lab!

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Basic CharacteristicsPages 181 – 183

• Read through and understand all 13 characteristics

• As you perform the dissections and look at organisms today, refer to these characteristics.

• Observe the animal and record your observations in the summary table on PAGE 224

Page 11: Animal Diversity I

Phylum Cnidaria – Hydras (Hydra)• Two tissue types, no complex organs

• Includes: corals, jellies, sea anemones, and Portuguese men-of-war.

• Most species are marine, few freshwater spp.

• Two body forms present in the life cycle:– Umbrella-like, free-swimming stage– Cylindrical, attached or stationary form – often grows into colonies of

individuals

• Observe live hydra in a depression slide and try to feed Daphnia or liver juice with string

• Also observe prepared slides

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Phylum Rotifera - Rotifers

• NOT IN LAB MANUAL

• Very small animals – most 0.1 – 0.5 mm in length

• Most common in freshwater, though some salt water species

• Important part of freshwater zooplankton, being a major food source and many species contributing to decomposition of organic matter.

• Pharynx contains tiny, calcified, jaw-like structure called trophi

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Last minute thoughts…• Be sure to record your observations in the Table on page 224

(might be better to reproduce in your lab notebook).

• If you have questions about your papers, please ask. Turn in your rough drafts (if you want feedback) by Friday.