HECTOCOTYLUS

NEWS: Hectocotylus is a specialised arm in male octopuses

ABOUT

• Hectocotylus is a specialised arm in male octopuses
• It is used for: Reproduction (mating), Identifying female octopuses

Biological Context

• Octopuses: Live solitary lives
• Rarely meet mates
• So they need efficient mechanisms for reproduction

Unique Function of Hectocotylus

Earlier belief:

• It only transferred sperm
• New discovery: It also acts as a sensory organ
• It can “taste” the female
• This makes it a dual-function organ

Role of CRT1 Receptor

• A protein called CRT1 receptor: Triggers mating behaviour
• Origin: Evolved from ancient neurotransmitter receptors
• Helps octopus: Detect chemical signals (for hunting prey)
• Over time: Specialised to detect progesterone

Evolutionary Significance

• Found in: Octopuses and squids
• Shows: Evolutionary innovation, Combination of: Sensory function + reproduction