Table 3 in A new genus and three new species of mangrove slugs from the Indo-West Pacific (Mollusca: Gastropoda: Euthyneura: Onchidiidae)

Table 3. Summary of internal traits that can help distinguish species of Paromoionchis gen. nov. All traits may be subject to individual variation. Traits are described in detail in the corresponding species descriptions and discussed in the species remarks. Traits are indicated for the mitochondrial units (when applicable) to show that those units are cryptic anatomically.
SpeciesMitoch. unitClade (Figs 1–4)Retractor muscle (penis) attachment siteAccessory penial gland & spine (size)Penis shapePenis hooksDistribution#1C~ heartyes (1 to 2 mm)thinyes (<20 μm)from Andaman Islands to Japan and New South WalesP. tumidus#2C~ heartyes (1.2 to 1.8 mm)thinyes (<22 μm)Northern Territory, Sumatra, Lombok, Luzon and Bohol#3C~ heartyes (0.8 to 1 mm)thinyes (<28 μm)Papua New GuineaP. daemelii–Bvery short or vestigialyes (2.5 to 2.7 mm)thinnoNew South Wales and Queensland#1Bvestigialyes (1 to 1.2 mm)thinnoBohol and LuzonP. boholensis#2Bnone or vestigialyes (1.1 to 1.8 mm)thinnoAmbon, Bali, Halmahera, Kei, Seram and SulawesiP. penangensis–Astrong and ~heartnolargenofrom Western India to Malaysia#1Athin (~ central nervous system)nothinnoLuzonP. goslinerior vestigial#2Along and ~ heartnothinnoAmbon, Bali, Halmahera, Sulawesi and Timor