what are these type of creatures?
They comprise of almost 67,000 described species, mostly small and their morphology varies greatly from the largest arthropod in the world – the Japanese spider crab to the smallest the 100-micrometre-long "Stygotantulus stocki".
Crustacean
The subphylum Crustacea comprises almost 67,000 described species, which is thought to be just to of the total number as the majority of species remain as yet undiscovered. Although most crustaceans are small, their morphology varies greatly and includes both the largest arthropod in the world – the Japanese spider crab with a leg span of – and the smallest, the 100-micrometre-long (0.004 in) "Stygotantulus stocki". Despite their diversity of form, crustaceans are united by the special larval form known as the nauplius.
where are the walking legs of crustaceans found UNANSWERABLE
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Crustacean [SEP] Classification
The name "crustacean" dates from the earliest works to describe the animals, including those of Pierre Belon and Guillaume Rondelet, but the name was not used by some later authors, including Carl Linnaeus, who included crustaceans among the "Aptera" in his '. The earliest nomenclaturally valid work to use the name "Crustacea" was Morten Thrane Brünnich's ' in 1772, although he also included chelicerates in the group. The subphylum Crustacea comprises almost 67,000 described species, which is thought to be just to of the total number as the majority of species remain as yet undiscovered. Although most crustaceans are small, their morphology varies greatly and includes both the largest arthropod in the world – the Japanese spider crab with a leg span of – and the smallest, the 100-micrometre-long (0.004 in) "Stygotantulus stocki".