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Antennae (sg.: antenna) (sometimes referred to as "feelers") are paired appendages used for sensing in arthropods. Antennae are connected to the first one or two segments of the arthropod head. They vary widely in form but are always made of one or more jointed segments.
The EFSA summarized that the killing methods most likely to cause pain and distress are: [85] Any procedures whereby the abdomen is separated from the thorax; The removal of tissue, flesh, or limbs while the crustacean is alive and fully conscious; Placing crustaceans in water slowly heated to the boiling point
The coxal gland is thought to be homologous with the antennal gland of crustaceans. The gland consists of an end sac (saccule), a long duct (labyrinth) and a terminal bladder (reservoir). [2] There is generally only one pair (two in some spiders), and they open on the coxae of the walking legs [1] or at the base of the second antennae in the ...
A tripartite structure is recorded from near the antennae, consisting of elevated walls arranged in a semicircle (likely to enlarge the surface for an excretory organ as in modern crustaceans), a pore representing an opening of the “antennal gland” (the purpose of which is unknown) and a sickle-shaped furrow surrounding this pore.
In Crustacea, the saccate metanephridia are associated with the antennae and form the antennal gland. In freshwater crustacea, the saccate metanephridia are especially large due to their role in osmoregulation; crustacea must remove large amounts of water from the tissues, as the cells are hypertonic to the surrounding water.
The most commonly accepted theory of why eye ablation reduces this inhibition is that a gonad inhibitory hormone (GIH) is produced in the neurosecretory complexes in the eyestalk. This hormone occurs in nature in the non-breeding season and is absent or present only in low concentrations during the breeding season.
Symptoms of anchor worm can be as follows: [3] Anchor worms (Lernaea sp.) can be seen with the naked eye; Frequent rubbing or "flashing" Localised redness; Inflammation on the body of the fish; Tiny white-green or red worms in wounds; Breathing difficulties; General lethargy
It has long pleopods, antennal, hepatic and branchiostegal spines on its carapace, a very short upper antennal flagella, strong spines to the rear of the midpoint on the third to sixth abdominal segments, a telson with four small mobile lateral spines, the females have an open telicum and the species shows secondary sexual dimorphism in body ...