Spiders, Lobsters, and Roaches are all examples of Anthropods.
LOBSTERS
The North-Atlantic lobster, otherly known as the American Lobster, excretes waste through excretory organs commonly located at the base of the antennae. Urine is also excreted through the antennae. Distgusting as it sounds, excretion through the antennae is the lobster's primary means of cleansing it's body of harmful waste from protein metabolism and tissue breakdown. Without eliminating these wastes, the lobster would be highly prone to infection and disease.Lobsters can also excrete waste through their gills as water enters and exits. Also, waste is released when a lobster molts, meaning it sheds its existing shell and grows into a larger one.
THE SPIDER
"Spiders? I hate spiders."- Ron Weasley, Harry Potter and the Chamber of Secrets.
Spiders often convert nitrogenous waste into uric acid. The uric acid is often released in solidified chunks through the anal region. The ability to produce waste in only solid pieces allows the spider (and many other anthropods) to conserve water which enables them to live away from water for months on end in a way that most animals cannot.
However, few spiders do produce waste through liquidized forms. This releases a great deal of water and other acids producing a liquid that is closely identical to ammonia.
Spiders often convert nitrogenous waste into uric acid. The uric acid is often released in solidified chunks through the anal region. The ability to produce waste in only solid pieces allows the spider (and many other anthropods) to conserve water which enables them to live away from water for months on end in a way that most animals cannot.
However, few spiders do produce waste through liquidized forms. This releases a great deal of water and other acids producing a liquid that is closely identical to ammonia.
THE ROACH
Like most anthropods, the excretory organ of the cockroach is the malpighian tubules. Unlike lobsters whose tubules are located in the antennae, the cockroach's tubules are located between the mid-gut and the hind-gut and extend through to the anus, like the spider. Excess water and acids are transported through the tubes, into the gut, where more acids are gathered, and then converted into uric acid. The uric acid is released in almost solid chunks called faeces.