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Sacculina. Sacculina is a genus of barnacles that is a parasitic castrator of crabs.They belong to a group called Rhizocephala.The adults bear no resemblance to the barnacles that cover ships, whales, and piers; they are recognised as barnacles because their larval forms are like other members of the barnacle class Cirripedia.
The chelicerae ("claw horns") that give the sub-phylum its name normally consist of three sections, and the claw is formed by the third section and a rigid extension of the second. [ 12 ] [ 19 ] However, spiders' have only two sections, and the second forms a fang that folds away behind the first when not in use. [ 16 ]
Having two valves or hinged parts. Contrast trivalve. blade The lamina or flattened part of a leaf, excluding the stalk or petiole. bloom A fine white or bluish waxy powder occurring on plant parts, usually stems, leaves, and fruits. It is easily removed by rubbing. bole The trunk of a tree, usually the portion below the lowest branch. Compare ...
Three different morphotypes of males exist. [13] The first stage is called "small male" (SM); this smallest stage has short, nearly translucent claws. If conditions allow, small males grow and metamorphose into "orange claws" (OC), which have large orange claws on their second chelipeds, which may have a length of 0.8 to 1.4 times their body size. [13]
3. open claw with water (W) entering (C). 4. claw with (P) pushed into chamber (C), forcing jet stream (J) out of (C). The claw snaps to create a cavitation bubble that generates acoustic pressures of up to 80 kilopascals (12 psi) at a distance of 4 cm from the claw. As it ejects from the claw, the bubble reaches speeds of 25 m/s (90 km/h; 56 ...
The report assumes that the violent reaction of lobsters to boiling water is a reflex response (i.e. does not involve conscious perception) to noxious stimuli. [ 35 ] A European Food Safety Authority (EFSA) 2005 publication [ 36 ] stated that the largest of decapod crustaceans have complex behaviour, a pain system, considerable learning ...
Filter feeding may have developed in association with swimming, with early morphological adaptations occurring on the appendages of the body trunk. Subsequent adaptations appear to have favored forward filtering appendages. Filtering appendages generate water currents that bring food items into reach for collection by setae.
Various parts of the exoskeleton may be fused together. [10]: 289 Each somite, or body segment can bear a pair of appendages: on the segments of the head, these include two pairs of antennae, the mandibles and maxillae; [5] the thoracic segments bear legs, which may be specialised as pereiopods (walking legs) and maxillipeds (feeding legs). [6]