31. Invertebrates

Echinoderms

Unit 14 - Echinoderms and Chordates

Many species possess an internal calcareous skeleton and spiny dermal projections.

No. Many species do possess an internal calcareous skeleton, but this is not the only true statement.

Larval forms show evidence of bilateral symmetry, which is mostly lost in the adult form.

No. Larval echinoderms do show evidence of bilateral symmetry, but this is not the only true statement.

One of the clades in this phylum is Asteroidea, which includes the sea stars and sea daisies.

No. This is the clade to which sea stars and sea daisies belong, but this is not the only true statement.

All possess a water vascular system, which permits movements via tube feet.

No. All echinoderms do possess a water vascular system, but this is not the only true statement.

Think about the unique characteristics of echinoderms.

Which of the following statements about the phylum Echinodermata is true?

Short Video: Echinoderm Tube Feet

Echinoderm Facts

No. Sea stars have a stomach and digestive glands.

No. Gametes are produced in gonads, as in most animals.

keeping all parts of the body moist at low tide

No. This is not a function of the water vascular system.

What part of the water vascular system can you see if you pick up a sea star?

The water vascular system of a sea star functions in __________.

Echinodermata - Basic Characteristics

The Spiny World of Echinoderms! | JONATHAN BIRD'S BLUE WORLD

Which of the following combinations of phylum and description is incorrect?
a. Echinodermata—bilateral symmetry as a larva, coelomate
b. Nematoda—roundworms, pseudocoelomate
c. Platyhelminthes—flatworms, gastrovascular cavity, acoelomate
d. Porifera—gastrovascular cavity, coelomate

The water vascular system of echinoderms
a. functions as a circulatory system that distributes nutrients to body cells
b. functions in locomotion and feeding.
c. is bilateral in organization, even though the adult animal is not bilaterally symmetrical.
d. moves water through the animal’s body during filter feeding.

ECHINODERMATA GENERAL CHARECTERS

No. Unlike many other members of the phylum Echinodermata, sea cucumbers do not have spines.

No. The endoskeleton in sea cucumbers is very reduced compared to other echinoderms.

They are elongated in the oral-aboral axis.

No. This structure gives them the elongated appearance from which they get their common name. The feature makes them look very different from other echinoderms.

They move by serpentine lashing of their arms.

No. This is a characteristic of brittle stars.

What system is unique to echinoderms?

What is one visible feature that makes it easy to identify sea cucumbers as echinoderms?

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