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Squid Dissection
Classification of the Squid
• Classification:
Kingdom Animalia,
Phylum Mollusca,
Class Cephalopoda,
Order Teuthoidea,
Families Loliginidae,
Sepiolidae, and
Architeuthidae.
What structures make the squid
belong to it’s classification groups?
• Kingdom Animalia
– Multi-cellular, cells have a nucleus (eukaryotic)
• Invertebrate ?: No back bone, not as complex of a body
as vertebrates, no skull.
• Phylum (See Link) Mollusca
(squid, octopus, squid, cuttlefish, nautilus, and
ammonite
– Class Cephalopod: Cephalopods are a class of fast-swimming mollusk.
(Head Footed)
• Order : Teuthida,
– Family (3 Families: Loliginidae, Sepiolidae, Architeuthidae)
» Genus
- Species: 300 species
Body Organization
• What are the five levels of body
organization for most advanced and
complex multi-celled organisms?
1. Cells: Chromatophores, Fat, Muscle, Nerve etc.
2. Tissues: Fat, Muscle, Epithelial, Nerve,
Connective
3. Organs: tentacles, head, eyes, mantle, siphon, fins, beak
brain, nerve, mantle, food tube, liver, stomach, gill, heart, ink
sac.
4. Organ Systems:
Cardio.
5. Organism: Squid
Nervous, Reproductive, Digestive,
General Characteristics
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Range Squid live throughout the world's oceans at all depths.
Size Largest: The giant squid can reach a length of 18 m (60 ft) including
tentacles, and weigh up to 900 kg (1980 lbs).
Smallest: One species of sepiolid squid only reaches a length of about 1.8
cm (0.7 in), and weighs as little as 700 mg (0.02 oz).
Feeding Habits Squid are carnivores; they eat fish, crustaceans, and
smaller squid.
Offspring Female squid lay thousands of eggs, which attach to foliage or
to objects at the bottom of the ocean.
Life Span The common squid lives about one to two years.
Did You Know Some squid have bioluminescent organs that make them
glow in the dark.
When being chased, many squid squirt a dark liquid to distract their
attacker.
Giant squid have eyes the size of basketballs.
Squid swim faster than any other invertebrate.
Biologists estimate that there are as many as 500 species of squid.
Phylum Mollusca
• 50,000 Species
• Include, Snails, Slugs, Clams, Oysters,
Squids, Octopuses, and some others.
• All organ systems present
• Muscular Foot, Coelam, Open Circulatory
System.
• Found in the sea, fresh water and land.
Class Cephalopod
• Description: Cephalopod means "head-foot." The foot of the
cephalopod is a cluster of tentacles that connects directly to the head. The
brain, the eyes, and the other sensory organs are well-developed.
Cephalopods breathe using gills. They swim by jet-propulsion; they rapidly
expel water from the mantle cavity through a specialized, tube-like organ
called the hyponome. Many can also eject a cloud of ink to confuse
enemies. They have Bilateral Symmetry.
Exactly how is the squid’s body
organized?
• Squid
• What level of organization is the squid?
• What level are the parts you will see inside
and outside the squid?
• Are the cells, tissues, organs, and systems
exactly like the human? Explain.
As Food?
• Fried calamari: breaded, deep-fried squid.
• Many species of squid are popular as food in cuisines as
diverse and separated as Korean and Italian. In Englishspeaking countries, it is often known by the name
calamari. Individual species of squid are found
abundantly in certain areas and provide large catches for
fisheries. The body can be stuffed whole, cut into flat
pieces or sliced into rings. The arms, tentacles and ink
are also edible; in fact, the only part of the squid that is
not eaten is its beak and gladius (pen).