Taxonomic key to the genus Guidettion

Remark: Guidettion arduifrons nom. inq. is not included in the key, owing to the unavailability of traits differentiating it from G. prorsirostre .

1. Macroplacoids granular ........................................................................................................................................ Guidettion montigenum

– Macroplacoid bar-like .................................................................................................................................................................................. 2

2. Caudal cuticular granulation present ....................................................................................................................... Guidettion clavatum

– Caudal cuticular granulation absent ......................................................................................................................................................... 3

3. Pharyngeal apophyses absent .................................................................................................................................. Guidettion modestum

– Pharyngeal apophyses present ................................................................................................................................................................... 4

4. pt of SSIP> 66% ...................................................................................................................................................... Guidettion prorsirostre

– pt of SSIP <66% ......................................................................................................................................... Guidettion vexatum nom. inq.