Lab 6 - Invertebrate Anatomy

Question 1

Mollusca and Arthropoda are _______.

Answer 1

Protostomes(mouth develops from the blastopore.)

Question 2

Lophotrochozoa

Answer 2

Mullusca

Question 3

Ecdysozoa

Answer 3

Arthropoda

Question 4

Mollusca means _____.

Answer 4

“Soft”.

Soft bodied creatures.

Question 5

Mollusks 3 body parts

Answer 5

1. Muscular Foot for locomotion
2. Visceral Mass containing internal organs
3. Mantle - secretes shells typically

Question 6

Squid

Answer 6

Class Cephalopoda

1, Muscular foot -> tentcles, parts of head, and excurrent siphon(locomotion)

2. Visceral mass
3. Mantle -> internalized and reduced but covers the internal organs.

Question 7

Arthropoda means ______.

Answer 7

“jointed feet”.

jointed appendages

Question 8

Arthropoda main features

Answer 8

1. Segmentation
2. Jointed appendages
3. Hard exoskeleton.

Question 9

Crayfish

Answer 9

Class Crustacea

Serially homologous, biramous(branched) appendages that have been extensively modified to perform specialized tasks.

Question 10

Crustaceans are the only arthropods with ________.

Answer 10

2 pairs of antennae.

Question 11

Mollusca and Arthropoda _______.

Answer 11

encompass much of the morphological, ecological, and species diversity within the clade Bilateria(bilateral animals).

Question 12

Mollusca and Arthropoda have very different _______.

Answer 12

Musculoskeletal and circulatory systems.

Question 13

Serial Homology

Answer 13

if the structures are repeated and have similar developmental origins.

Crayfish have a series of 19 initially similar appendages which have been modified to perform different tasks.

Decapod crustacean.

Question 14

Crayfish have a _____ circulatory system.

Answer 14

Open.

Blood flows from arteries into sinuses within tissues. Deoxygenated flows over gills before returning to the heart.

Blood carries cellular waste to the disk-like green glands.

Question 15

Squids have ______ hearts.

Answer 15

2 hearts.

Systemic heart and Gill heart.