SQUID DISSECTION
PREPARATION!
5th Grade Ms. B
Key Terms
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Stomach
Ink sac
Esophagus
Gill
Heart
Gonad
Anus
Pen
Key Terms
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Arms
Tentacles
Nidamental Gland
Buccal Bulb
Chromatophores
Buccal Bulb: muscle that operates the
beak
Radula: rows of teeth
Squid Anatomy
• Chromatophores: spots change size to change
the squid’s color for camouflage
Fins: Help squid change direction
when swimming
Mantle: the main part of the squid’s
body that covers its internal organs
Pen: feather-shaped internal structure
that supports the squid’s mantle and
stabilizes the squid for swimming
Stomach: digest food
Ink Sac: defense mechanism
Ink: pigment melanin which artists
refer to as “sepia ink”
• Octopi = black ink
• Squid = blue-black ink
• Cuttlefish = brown ink
Eyes: ability to see as well as people!
Have 8 arms and 2 tentacles
Arms vs. Tentacles
• Arms: short, rip apart prey and stuff it into the
mouth
• Tentacles: long and have suckers on the end
 shoot out to capture prey
Suction cups: help squids hold onto
food and act as “taste buds”
Gills: absorb oxygen from water
Beak: mouth resembles a bird’s beak
Gonad: reproductive organ
males = white in color
females = clear
Siphon: a tube that squirts out water so that
the squid moves like a jet airplane
• Females:
Male or Female?
– Eggs = yellow in color
– Nidamental glands: large, oval white organs in the
middle of the cavity
Males:
Virtual Dissection
• http://www.biologycorner.com/worksheets/sq
uid_virtual.html#.Uwya-3ddV7E