Chapter 18b Invertebrates Review Jariel Third Exam

Flatworms include Planarian, fluke, and tapeworms. Describe Each

A planarian has a gastrovascular cavity and a simple nervous system.

Flukes and Tapeworms are parasitic flatworms with complex life cycles.

Enumerate the characteristics of nematodes (roundworms)

Bilateral Symmetry

Three tissue layers

A nonliving protective cuticle that is shed periodically

A complete digestive tract with a mouth and anus

Enumerate the characteristics of Molluscs and give examples

a muscular foot that functions in locomotion

a visceral mass containing most of the internal organs

a mantle, which may secrete a shell that encloses the visceral mass,

A circulatory system.

Example: Squid

What bilateral animal does not have a body cavity or coelom?

Flatworms

What are these bilateral roundworms that have a cuticle, a protective body covering that shed periodically?

Nematodes

What groups of animals that have a muscular foot, visceral mass and mantle?

Molluscs

Enumerate the characteristics of annelids and give examples.

Segmentation, the subdivision of the body along its length into a series of repeated parts,

a nervous system

a closed circulatory system in which blood remains enclosed in vessels throughout the body.

Example: Earthworm

Differentiate errantians from sedentarians based on mobility.

Errantians: (Mostly Mobile marine worms)

Sedrntarians: (Less Mobile worms) earthworms, leeches, and many tube dwellers.

Characterize Arthropods and give examples.

are segmented animals with jointed appendages and an exoskeleton.

example: crayfish, lobsters, crabs, barnacles, spiders, ticks, and insects.

Differentiate Cephalothorax from head and thorax.

As nouns the difference between thorax and cephalothorax

is that thorax is the middle of three distinct divisions in an insect, crustacean or arachnid body while cephalothorax is (anatomy) the fused head and thorax of spiders and crustaceans.

Differentiate millipede from centipede based on the number of appendages per segment.

Here are a few tips to spot the differences: Millipedes have two sets of legs per segment positioned directly under their body. Centipedes have one set of legs per segment positioned on the side of their body.

Enumerate the typical body parts of an insect.

head

thorax

abdomen

three sets of legs (hexapods)

(wings) (in most)

Wings and walking legs of insects are attached to

Thorax

Insects have more than one million species which is ______ % of all animal species

75%

Insects are the most successful group of animals to diversify and multiply. Yes or No

yes this is true

What are characteristics of insects that contribute to their success on survival and diversity?

Body segmentation

exoskeleton

jointed appendages

flight

a waterproof cuticle

a complex life cycle with short generations and large numbers of offspring

Are Arthropods and velvet worms closest living relatives?

THEY ARE CLOSEST LIVING RELATIVES

What are characteristics of Echinoderms and give examples?

have an exoskeleton of hard calcium-containing plates under a thin skin.

a water vascular system based on a network of water filled canals that branch into extensions called tube feet

the ability to regenerate lost arms.

Example: Starfish

Know the difference between an echinoderm and an arthropod.

Echinoderm has an endoskeleton.

Arthropods have exoskeleton.

Give examples of Invertebrates Chordates?

Lancelets and Tunicates