astacoidea การใช้

The chief distinction between the Northern Hemisphere superfamily Astacoidea and the Southern Hemisphere superfamily Parastacoidea is usually the form of the genitalia, but these have not been preserved in any known specimen of " Aenigmastacus ".
:: " He read aloud the beginning of the Wikipedia entry for crawfish :'Crayfish, crawfish, or crawdads members of the superfamilies Astacoidea and Parastacoidea are freshwater crustaceans resembling small lobsters, to which they are related . '"
Feldmann " et al . " therefore relied on the form of the telson, which has a diaeresis ( division into two halves ) in Astacoidea, but none in Parastacoidea; this distinction was noted by Thomas Henry Huxley, Martin Glaessner and Horton H . Hobbs, Jr . While no diaeresis is visible on the telson of " Aenigmastacus ", a diaeresis on the uropods, which is seen in both superfamilies, is preserved in some specimens of " Aenigmastacus ", suggesting that its apparent absence from the telson is not merely an artefact of preservation.