Arrhopalites

Key for identification of neotropical Arrhopalites

1 Anal valve cuticular spines absent ................................................................................ 2

­ Anal valve cuticular spines present............................................................................... 8

2 Ant IV not subdivided, all unguis with a filamentous inner tooth ................ A. diversus

­ Ant IV subdivided, inner teeth not filamentous when present ..................................... 3

3 Ant IV subdivided into 5 subsegments ......................................................................... 4

­ Ant IV subdivided into 6 or more subsegments............................................................ 7

4 Ant III basal swelling present........................................................................................ 5

­ Ant III basal swelling absent......................................................................................... 6

5 Female subanal appendages spoon shaped with fringed edges (4d) ............ A. plectrifer

­ Female subanal appendages a simple rod withfringed apex (14a) ................... A. dubius

6 Female subanal appendages branche or deeply serrated (5c) ......................... A. benitus

­ Female subanal appendages simple rod with fringed apex (1ad) ................ A. pygmaeus

7 Ant IV subdivided into 6 subsegments, eyes 1+1 ........................................... A. amarus

­ Ant IV subdivided into 7 subsegments, eyes 2+2 ....................................... A. bellingeri

8 Eyes 2+2....................................................................................................................... 9

­ Eyes 1+1..................................................................................................................... 10

9 Ant IV subdivided into 4 ringed subsegments, anal valve C1 lamelate ........ A. amorimi

­ Ant IV subdivided into 6 ringed subsegments, C1 swollen basally................................ ...................................................................................................... A. heteroculatus sp.n.

10 Ant IV not subdivided. ............................................................................................... 11

­ Ant IV subdivided ....................................................................................................... 14

11 Dental id3 present, medial ve1 spinelike. .................................................................. 12

­ Dental id3 absent, ve1 normal..................................................................................... 13

12 Anal valve C3–C6 lamellate, all ungues with tunica and inner tooth .............. A. caecus

­ C3–C6 swollen basally, first unguis without inner tooth, tunica absent ............ A. millsi

13 Anal valve upper flap with 4 cuticular spines (s0 absent), tunica absent ........ A. harveyi

­ anal valve upper flap with 5 spines (s0 present), tunica present. A. alambariensis sp.n.

14 Ant IV subdivided into 5 ringed subsegments ........................................................... 15

­ Ant IV subdivided into 6 ringed subsegments ............................................................ 16

15 Anal valve C1 lamellate, first unguis without tunica ................... A. botuveraensis sp.n.

­ Anal valve C1 swollen basally, all unguis with tunica ............................... A. vazquezae

16 Tunica absent, anal valve C1 swollen basally ............................................. A. lawrencei

­ Tunica present, anal valve C1 lamellate...................................................................... 17

17 Cephalic setae M3–5 not spinelike, dental E4–5 spinelike, third unguiculus without apical filament .............................................................................................. A. gnaspinii

­ Cephalic M3–5 spinelike, dental E4–5 normal, third unguiculus with short apical fila­ ment not exceeding theunguis tip................................................... A. paranaensis sp.n.