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The pair attached to the first segment of the head are called primary antennae or antennules. This pair is generally uniramous, but is biramous in crabs and lobsters and remipedes . The pair attached to the second segment are called secondary antennae or simply antennae .
These large crabs have a bright red body with small white eyespots surrounded by black. Their bodies are covered with long erect coarse hairs of a dark red color. They have a pair of long white primary antennae or antennules, a pair of secondary antennae, stalked green brown eyes and three pairs of mouth appendages. The stalks of the eyes are ...
The California rock crab fishery is made up of three species - the yellow rock crab (C. anthonyi), the brown rock crab (R. antennarium), and the red rock crab (C. productus). Rock crab landings for 1999 were 790,000 pounds and have averaged 1.2 million pounds per year from 1991-1999. [2]
The fiddler crab or calling crab can be one of the hundred species of semiterrestrial marine crabs in the family Ocypodidae. [2] These crabs are well known for their extreme sexual dimorphism, where the male crabs have a major claw significantly larger than their minor claw, whilst females claws are both the same size. [ 3 ]
The family Homolidae, known as carrier crabs [1] or porter crabs, [2] contains 14 genera of marine crabs. They mostly live on the continental slope and continental shelf , and are rarely encountered. [ 3 ]
Between 2018 and 2021, there was an unexpected 92% decline in snow crab abundance, or about 10 billion crabs. The crabs had been plentiful in the years prior, puzzling scientists and crabbers alike.
West coast states are spending millions to protect their inland waterways from invasive crabs. In some places, otters are just eating them. Out-of-control invasive species has met its match: Cute ...
The sand crabs with soft shells that have just moulted are kept for bait, while the hard-shelled crabs are thrown back into the sea. [ 6 ] The sand crab has been evaluated as an indicator species for monitoring the level of domoic acid -synthesizing diatoms ( Pseudo-nitzschia spp.) which sometimes cause toxic blooms off the coast of California.