Anatomical Features of Red Rock Lobster
External features and their function
Compound eyes at the tip of the eye stalks.
Long "feelers" that can be rotated around to fend off predators. They also have some sensory function.
The short slender appendages are capable of detecting food (tasting), danger, and pheremones.
5 pairs of legs used for walking and feeding.
(or cephalothorax, the head & thorax)
Protection of vital organs such as the liver, stomach, gonads, gills and heart by the exoskeleton case.
Tail (or abdomen)
Consisting of 6 separate, moveable parts, plus the tail fan (telson and uropods). The main muscle for movement (swimming) away from danger. Under the tail are paired feather-like appendages (pleopods).
External features - location and identification
Internal features - location and identification
Internal features and their function
The mouth is for the ingestion of food. It has a series of appendages associated with it that help bring the food to the mouth and crush it before ingestion.
The gills, which sit under the carapace at the base of each leg, are used for the uptake of oxygen from the water and release of carbon dioxide.
The heart pumps the blood around the body of the lobsters.
The gonad produces eggs or sperm for reproduction.
The hepatopancreas (or liver) produces the digestive fluids which break down the food that is eaten.
The digestive tract is used to absorb the nutrients from the food.
The waste products of digestion are excreted through the anus.
Females. Positioned on the base of the 3rd walking leg for females so the eggs are extruded and pass through the sperm package the male deposits on her abdomen before attaching to the pleopods
Males. Positioned on the base of the 5th walking leg for males so the sperm package is deposited below the female genital pores
Present on the 5th leg of the female only, it is used for grooming the eggs when they are attached to the pleopods
Not present on the males
Females have biramous (or double) pleopods. The innermost branches of the pleopods are covered with long hairs for the attachment of the eggs. The female keeps the eggs aerated by slowly beating her pleopods.
Males have single pleopods
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