Key to species of Agononida known from Australia

1 Basal antennal segment produced to long slender spine, extending anteriorly beyond eyes ....................................................................................................................................... 2

– Basal antennal segment produced to short triangular spine, not extending beyond eyes ....................................................................................................................................... 4

2 Carapace without cardiac spines ................................... A. incerta (Henderson, 1888)

– Carapace with cardiac spines ....................................................................................... 3

3 Carapace with median mesogastric spines ........................... A. eminens (Baba, 1988)

– Carapace without median mesogastric spines ................ A. marini Macpherson, 1994

4 Carapace with pair of protogastric spines behind pair of epigastric spines; with 2 or more cardiac spines ....................................................................................................... 5

– Carapace without protogastric spines; with at most single median cardiac spine ....... 6

5 Propodus of cheliped with palm 17–18 times as long as high and about twice as long as dactylus ........................................................................................... A. procera n. sp.

– Propodus of cheliped with palm about 9 times as long as high and about 1.6 times as long as dactylus ......................................................................... A. soelae (Baba, 1986)

6 Carapace without cardiac spines ....................................... A. pilosimanus (Baba, 1969)

– Carapace with single median cardiac spine................ A. squamosa (Henderson, 1885)