Lab 8: Invertebrate Anatomy

Question 1

Which two phyla encompass much of the morphological, ecological, and species diversity within the clade Bilateria.

Answer 1

Mollusca and Arthropoda

Question 2

Two phyla (Mollusca and Arthropoda) encompass much of the morphological, ecological, and species diversity within the clade __________.

Answer 2

Bilateria

Question 3

Mouth develops from the blastopore.

Answer 3

Protostome

Question 4

Mollusca and Arthropoda are __________ groups.

Answer 4

Protostome

Question 5

Mollusca and Arthropoda have very different __________ and __________ systems.

Answer 5

Musculoskeletal and circulatory

Question 6

The Mollusca belong to the __________.

Answer 6

Lophotrochozoa

Question 7

The Arthropoda belong to the __________.

Answer 7

Ecdysozoa

Question 8

Mollusca comes from the Latin “molluscus” meaning:

Answer 8

Soft

Question 9

A __________ covers the internal organs of Cephalopods.

Answer 9

Mantle

Question 10

The shell has been __________ and __________ in the squid.

Answer 10

Reduced, internalized

Question 11

The __________ __________ has been modified in cephalopods into the tentacles, parts of the head, and a muscular excurrent siphon.

Answer 11

Muscular foot

Question 12

Arthropoda comes from the Greek arthropod meaning __________ __________.

Answer 12

“Jointed feet”

Question 13

Arthropods have hard __________.

Answer 13

Exoskeletons

Question 14

Today’s lab will examine the __________.

Answer 14

Crayfish

Question 15

Branched.

Answer 15

Biramous

Question 16

Crustaceans are known for their serially __________, __________ appendages that have been extensively modified to perform specialized tasks.

Answer 16

Homologous, biramous

Question 17

__________ are the only Arthropods with 2 pairs of antennae.

Answer 17

Crustaceans

Question 18

Squid also have a separate __________ __________ which lies directly between the gills.

Answer 18

Systemic heart

Question 19

The __________ and __________ comprise the squid’s skeleton.

Answer 19

Gladius, cranium

Question 20

The __________ is the long, translucent, plastic-like structure that runs the length of the body and supports the mantle and internal organs.

Answer 20

Gladius

Question 21

Looks like a long, dark tube that opens near the funnel.

Answer 21

Ink sac

Question 22

Running parallel to the ink sac is the __________ which ends at the __________.

Answer 22

Intestine, anus

Question 23

The large white mass located at the posterior end of the mantle.

Answer 23

Caecum

Question 24

The __________ lies anterior to the caecum and contains visible folds; it looks like a piece of chewing gum.

Answer 24

Stomach

Question 25

Structures within an organism exhibit __________ __________ if the structures are repeated and have similar developmental organs.

Answer 25

Serial homology

Question 26

Walking legs

Answer 26

Periopods