Paromoionchis, Dayrat & Goulding & Khalil & Apte & Bourke & Comendador & Tan, 2019, Dayrat & Goulding & Khalil & Apte & Bourke & Comendador & Tan, 2019

Dayrat, Benoît, Goulding, Tricia C., Khalil, Munawar, Apte, Deepak, Bourke, Adam J., Comendador, Joseph & Tan, Shau Hwai, 2019, A new genus and three new species of mangrove slugs from the Indo-West Pacific (Mollusca: Gastropoda: Euthyneura: Onchidiidae), European Journal of Taxonomy 500, pp. 1-77 : 74

Identification key

A key is provided here to help identify the five species of Paromoionchis gen. nov. Because species cannot be distinguished externally, the key is based on internal characters of reproductively mature specimens.

1. Accessory penial gland absent.........................................................................................................2

– Accessory penial gland present.........................................................................................................3

2. Penis large, within large penial sheath ..... P. penangensis gen. et sp. nov. (W India to Malacca Strait)

– Penis thin, within thin penial sheath ........ P. goslineri gen. et sp. nov. ( Indonesia and Philippines)

3. Penial retractor muscle reaches heart; thin penis with hooks ............................................................... .... P. tumidus ( Semper, 1880) (Andaman Islands to subtropical waters of SE Australia and S Japan)

– Penial retractor muscle very short, vestigial, or absent; thin penis with no hooks............................4

4. Accessory penial gland spine <1.8 mm in length .............................................................................. .................................................................. P. boholensis gen. et sp. nov. ( Indonesia and Philippines)

– Accessory penial gland spine> 2.5 mm in length ............ P. daemelii gen. et sp. nov. (SE Australia)