Male Squid Gill

Penis with spermatophores

Gill

Penis with spermatophores

Funnel or siphon Funnel retractor muscle Gill Penis Sperm duct

Cecum Gill or branchial heart Gill Rectum Systemic heart

Male Squid

Male Squid

Spermatophores Sperm duct

Systemic heart

Branchial heart

Caudal aorta

Female Squid

Ovary with eggs Nidamental Gland

Funnel retractor muscle Funnel or siphon Chromatophores (Pigment cells)

Gill Cecum

Eggs in ovary Nidamental gland Accessory nidamental gland

Female Squid

Gill (Branchial) Heart

Gill (Branchial) Heart Systemic Heart

Medial mantle artery

Lateral Mantle Artery

Male Squid

Caudal Aorta Testis Stellate ganglion

Gill Funnel or siphon

Cecum

Testis Penis

Gill

Gill

Systemic Heart

Gill (Branchial) Heart

Gill Heart

Caudal Aorta

Medial Mantle Artery

Funnel or Siphon

Stellate ganglion

Male Squid

Rectum A.

B. C.

D. E. F.

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

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.

Efferent gill blood vessel transports high O2 blood to systemic heart.

Systemic heart

Caudal aorta

Right lateral mantle artery

Gill

Note that I removed the right gill (branchial) heart

Left gill (bracnhial) heart

Systemic heart Caudal aorta

Lateral mantle artery

Gill

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

Right lateral mantle artery Caudal aorta Systemic heart

Left lateral mantle artery

Left gill (branchial) heart

Systemic heart

Caudal aorta

Right lateral mantle artery

Left lateral mantle artery Gill

1. 2. 3.

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