Table 3 in A new genus of air-breathing marine slugs from South-East Asia (Gastropoda, Pulmonata, Onchidiidae)

Table 3. Summary of traits that can help distinguish the two species of Laspionchis. All traits are subject to individual variation. Traits are described in detail in the corresponding species descriptions. Traits are also indicated for the three subspecies of L. bourkei.
SpeciesRetractor muscle (penis)Retractor muscle (penis) attachment siteDistal muscle fibersAccessory penial gland spine size (mm)Penial hooks (μm)DistributionL. bouchetiStrong and longPosterior end of visceral cavity (by the rectum)yes0.7 to 160 to 160Peninsular Malaysia, Indonesia (Sumatra), Singapore, Brunei, Vietnam, Philippines (Bohol), Australia (Northern Territory, Queensland)L. bourkei bourkeiVery shortAnterior third of the visceral cavityno0.75 to 120 to 35Australia (Northern Territory)L. bourkei lateriensisAbsent or vestigial-no0.35 to 0.7520 to 45Indonesia (Ambon)L. bourkei matangensisAbsent or vestigial-no0.43 to 0.5715 to 40Peninsular Malaysia, Indonesia (Sulawesi, Sumatra), Singapore, Philippines (Bohol), Vietnam