Octopus General Characteristics | Free Biology Notes

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General Characteristics of Octopus

• Marine and free-swimming
• Internal shell and nidamental gland absent
• The body is oval and with no lateral fins
• Head distinct and large with well-developed eyes and mouth.
• Foot modified into arms and attached with head
• One of the arms of male is spoon shaped and is called hectocotylized which is used to transfer sperms into the female.
• Octopus ejects an inky fluid in water and forms a screen for defence from its enemies
• Octopus can change its colour.
• Sexes separate and develop­ment is direct