Asymmetrione, Codreanu, Codreanu & Pike, 1965

Williams, Jason D., Boyko, Christopher B. & Madad, Asma Z., 2019, Branchial parasitic isopods (Crustacea: Isopoda: Bopyridae: Pseudioninae) of hermit crabs (Crustacea: Decapoda: Diogenidae) from the western Pacific, with descriptions of a new genus and three new species, Raffles Bulletin of Zoology 67, pp. 83-118 : 86

Key to species of Asymmetrione based on females [ A. imarani Kazmi & Khatoon, 2016 , not included in the key]

1. Greater than 50° body asymmetry..........................................2

– Less than 50° body asymmetry ..............................................9

2. Pleomere 5 with ovate and dorsally displaced lateral plates as well as pair of swellings on dorsal surface of pleotelson......3

– Pleomere 5 without ovate and dorsally displaced lateral plates or pair of swellings on dorsal surface of pleotelson..............5

3. Lateral plates of fifth pleomere ovate.....................................4

– Lateral plates of fifth pleomere spherical................................. ........................................................ A. dardani Bourdon, 1968

4. Body asymmetry 65–70°; barbula central region with numerous digitations laterally ......................... A. harmoniae new species

– Body asymmetry ca. 100°; barbula central region with three digitations laterally... A. globifera An, Markham & Yu, 2010

5. Outer lobes of barbula digitate on margins............................8

– Outer lobes of barbula smooth on margins............................6

6. Pleopods tuberculate................. A. nossibensis Bourdon, 1976

– Pleopods smooth .....................................................................7

7. Lateral plates on pleomeres 1–3............................................... ................................................... A. clibanarii Markham, 1975

– Lateral plates on pleomeres 1–5............................................... .................................. A. sallyae Williams & Schuerlein, 2005

8. Second oostegites dissimilar ... A. asymmetrica ( Shiino, 1933)

– Second oostegites similar.......................................................... ......................... A. shiinoi Codreanu, Codreanu & Pike, 1965

9. Uropods uniramous ...............................................................10

– Uropods biramous .................................................................11

10. Lateral plates lacking on pleomeres 1–5.................................. ........................ A. aequalis Pardo, Boyko & Mantelatto, 2009

– Lateral plates present on pleomeres 1–5 .................................. ........................................................ A. foresti ( Bourdon, 1968)

11. Oostegite 1 posterior lobe larger than anterior ........................ ............................................ A. ambodistorta Markham, 1985a

– Oostegite 1 lobes subequal in size ........................................... ...................................................... A. desultor Markham, 1975