Lobsters breathe through gills, which are located in a structure called the carapace. The carapace is situated at the top of the cephalothorax, which is commonly referred to as the lobster’s head. There are 20 pairs of gills that are separated into two branchial chambers inside the carapace. The gills are made up of short, fine filaments that absorb oxygen directly from the water.Know More
Water enters the lobster’s body through openings on the underside of its body. The water is forced through the branchial chambers by a structure called the gill baler, or bailer. The current of water, which normally flows towards the lobster’s head, can be reversed to clear debris out of the gills and branchial chambers. The flow of water also carries away urine, which contains biochemical signals about the individual’s gender, reproductive state and molting stage.
The gills of the lobster are very sensitive to environmental diseases, such as excretory calcinosis, which causes minerals to accumulate on the gills, according to Wikipedia. This eventually kills the lobster because it blocks oxygen uptake from the water. There was an outbreak of this disease in 2002, in Long Island Sound, that was thought to be caused by warmer water temperatures near the ocean floor, which is the lobster's natural habitat.Learn More
Both lobsters and cockroaches are arthropods, making them distant relatives. An arthropod is a member of the phylum Arthropoda, which includes insects, crustaceans and arachnids. Arthropods are characterized by a jointed exoskeleton composed of chitin, a segmented body and jointed appendages.Full Answer >
Although it is impossible to differentiate between pain and reflex, a recent study by scientists from Queen's University have concluded that there is a high possibility that lobsters and other crustaceans do feel pain on the grounds that they learn to avoid negative or "painful" stimulation. Lobsters and other crustaceans have very different biological systems from vertebrate animals, and primitive nervous systems that lack a brain.Full Answer >
Most bivalves absorb nutrition by filter feeding, which involves drawing particles of food into their gills through their mouths and into their stomachs. Some bivalves trap food with mucus-covered tentacles. Others are carnivorous, using siphons to draw in worms, larvae and crustaceans that are then pushed into their mouths.Full Answer >
Crayfish use their gills to breathe. A crayfish has a gill at the base of each leg. These gills are very delicate and are covered by the crayfish's carapace, or shield. This carapace is aligned backwards from the head, allowing water to run through in a channel over the gills, which provides a continuous source of oxygen that allows the crayfish to breathe.Full Answer >