Biramous synonyms

- Though concealed within the bivalved shellcover, the mouth-parts are nearly as in the Gymnophylla, but the flexing of the caudal part is in contrast, and the biramous second antennae correspond with what is only a larval character in the other phyllopods.

- Squilla mantis bases tends to show that the primitive (Stomatopoda), showing the type of appendage was more complex last four thoracic (leg-bearthan the simple biramous limb, and ing) somites free from the some authorities have regarded the carapace.

It is highly probable, however, that the biramous limb is a simplification of a more complex primitive type, to which the Phyllopod limb is a more or less close approximation.

In the Malacostraca, the antennules are often biramous, but there is considerable doubt as to whether the two branches represent the endopodite and exopodite of the other limbs, and three branches are found in the Stomatopoda and in some Caridea.