Key to Pennarhodeus species (known adult females)

1. Arthrodial process elongate, three-pointed; podonotal and opisthonotal shields imbricate; genital shield lightly reticulate; unsclerotised integument between genital and ventrianal shields with a transverse elongate accessory platelet; peritreme extending anteriorly to level of anterior margin of coxa III.......................... Pennarhodeus decoris Karg, 2000a

- Arthrodial process of chelicera with a short coronet-like fringe; podonotal shield mostly with roundish markings, except for reticulate antero-lateral region, and opisthonotal shield reticulate; genital shield smooth; unsclerotised integument between genital and ventrianal shields without accessory platelet; peritreme extending anteriorly to mid-level of coxa II................................................................................... Pennarhodeus pennatus Karg, 2000a

Key to Pennarhodeus species (known adult males)

1. Epistome with margin serrate laterad to antero-lateral projections; podonotal shield imbricate; with two crescent-shaped scleronoduli between setae j5 and j6; unsclerotised integument between sternogenital and ventrianal shields with a subtriangular accessory platelet; with two spur-like ventral setae on each of femur, genu and tibia II................................................................................................... Pennarhodeus brevipennatus Karg, 2000b

- Epistome with margin smooth laterad to antero-lateral projections; podonotal shield mostly with roundish markings, except for reticulate antero-lateral region; without scleronoduli; unsclerotised integument between sternogenital and ventrianal shields without accessory platelet; with one spur-like ventral seta on each of femur, genu and tibia II.......................... 2

2. Epistome with antero-medial projection about 1.2 times as long as antero-lateral projections; opisthonotal shield reticulate; seta R5 present, inserted on unsclerotised integument; sternogenital shield lightly reticulate................................................................................................... Pennarhodeus pennatus Karg, 2000a

- Epistome with antero-medial projection about twice as long as antero-lateral projections; opisthonotal shield with reticules of aligned granules; seta R5 absent; sternogenital shield smooth......................... Pennarhodeus turris Karg, 2000a