Expanathura, Wagele, 1981

Shiraki, Shoki, Shimomura, Michitaka & Kakui, Keiichi, 2021, A new species of Expanathura (Crustacea: Isopoda: Anthuroidea) from Iriomote Island, Japan, with a note on male polymorphism, Zootaxa 5047 (3), pp. 377-390 : 389

Key to the species in female Expanathura (modified from Poore & Lew Ton 2002)

1. Uropodal exopod lanceolate; telson tapering; pleopod 1 endopod much shorter than exopod............... 2 (first group)

- Uropodal exopod broad; telson spoon-shaped; pleopod 1 endopod barely shorter than exopod........... 4 (second group)

2. Telson less than twice as long as wide; pleopod 1 endopod ca. one-half length of exopod... E. amstelodami ( Kensley, 1976)

- Telson more than twice as long as wide; pleopod 1 endopod ca. one-third length of exopod.......................... 3

3. Uropodal exopod 3.5 times as long as wide; pleopod 1 endopod>3 times as long as wide......... E. mooreae Müller, 1993

- Uropodal exopod 2.5 times as long as wide; pleopod 1 endopod twice as long as wide... E. ardea ( Poore & Kensley, 1981)

4. Uropodal exopod with obtuse-triangular projection (apex angle about 120°)...................................... 5

- Uropodal exopod with acute-triangular projection (apex angle about 90°)........................................ 6

5. Telson with several short and 1 long posterolateral setae; telson oval....................... E. collaris ( Kensley, 1979)

- Telson with posterolateral setae all short; telson truncate.......................... E. haddae ( Kensley & Poore, 1982)

6. Antennal peduncular article 2 without outer triangular projection....................... E. macronesia ( Kensley, 1980)

- Antennal peduncular article 2 with outer triangular projection.................................... E. monile sp. nov.