Gill Male Penis with spermatophores

Gill Penis with spermatophores Funnel or Funnel retractor muscle Gill Penis Sperm duct

Male Squid

Gill or branchial heart Rectum Gill Systemic heart Cecum Spermatophores Sperm duct Caudal aorta Male Squid

Branchial Systemic heart heart Ovary with eggs Cecum Gill

Female Squid

Chromatophores (Pigment cells) Funnel retractor muscle Funnel or siphon Accessory Eggs in ovary nidamental gland Nidamental gland

Female Squid Funnel or Medial artery Gill (Branchial) Heart Gill siphon Male Squid

Lateral Systemic Testis Caudal Aorta Stellate Mantle Gill (Branchial) Heart Heart Artery ganglion Medial Gill Systemic Mantle Heart Heart Gill Funnel or Siphon Cecum Artery

Male Squid

Testis Caudal Gill (Branchial) Gill Penis Stellate ganglion Aorta Heart B. E. F. C. Rectum A. D.

G. H. I. J. K. L. Answers

A. Cecum B. Lateral mantle artery C. Medial mantle artery D. Gill (Branchial) heart E. Systemic heart F. Gill G. Testis H. Caudal aorta I. Penis J. Stellate ganglion

1. 2. 3. 4. 5. Answers

1. Funnel or siphon 2. Funnel retractor muscle 3. Gill 4. Nidamental gland 5. Ovary

Note that I removed the right gill (branchial) heart

Left gill (branchial) heart pumps low O2 blood to the gills

Afferent gill blood vessel transports

low O2 blood to from gill heart to gills. Right lateral Gill mantle artery Efferent gill blood vessel transports

high O2 blood to systemic heart.

Caudal Systemic aorta heart Note that I removed the right gill (branchial) heart.

Left gill (bracnhial) heart

Lateral mantle artery

Systemic heart Caudal aorta

Gill Left lateral Left gill (branchial) heart mantle artery

Right lateral Caudal aorta Systemic heart mantle artery Right lateral Systemic heart mantle artery Caudal aorta

Gill Left lateral mantle artery 3. 1. 2.

4.

5.

6. Answers

1. Systemic heart 2. Caudal aorta 3. Right lateral mantle artery 4. Left lateral mantle artery 5. Gill (branchial) heart 6. Gill