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Coxal gland and its components. The coxal gland is a gland found in some arthropods, for collecting and excreting urine. They are found in all arachnids (with the exception of some Acari), and in other chelicerates, such as horseshoe crabs. [1] The coxal gland is thought to be homologous with the antennal gland of crustaceans.
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.
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 American lobster was given its current scientific name of Homarus americanus by Henri Milne-Edwards in his 1837 work Histoire naturelle des Crustacés ("Natural History of the Crustacea"). [2] The common name preferred by the Food and Agriculture Organization is "American lobster", but the species is also known locally as the "northern ...
Its innervation from the rear of the brain has suggested to some workers that, if an appendage, it is the appendage of the tritocerebral segment; a point disputed by others who argue that the presence of a well-developed appendage in at least crustaceans in this segment (i.e., the second antenna, corresponding to the intercalary segment of ...
A Missouri girl was critically injured in a fight captured on video near Hazelwood East High School, the St. Louis County Police Department said. Video of Friday’s altercation has since been ...
CAIRO/GAZA (Reuters) -On foot or riding rickshaws, many Palestinians exhausted by war in Gaza began returning to the ruins of their homes on the third day of a ceasefire between Israel and Hamas ...
The flagellum of the second antenna reaches past the pereon. [3] In females the second antenna is much smaller than the first antenna. In males the third maxilliped and the first four pereiopods almost always have exopods (outer branches). In females they may, in rare cases, be absent from all but the third maxillipeds, and the two first ...