Table 4.

Summary of traits that can help identify Peronia species, based exclusively on specimens examined for the present revision. Species are arranged in a phylogenetic order (Figs 2–4). Traits are described in detail in species descriptions.

Species		Max. animal length (mm)	Papillae with dorsal eyes	Intestinal type (transitional loop orientation)	Retractor muscle insertion (near heart or end of visceral cavity)	Muscular sac length (mm)	Accessory penial gland spine length (mm)	Accessory penial gland spine diameter base (μm)	Accessory penial gland spine diameter tip (μm)	Penis hooks length (μm)	Distribution
P. peronii		140	15–20	I (12–3 o’clock)	heart (exc. vestigial)	>20	3.0–5.0	400–500	160–200	<50	Indo-West Pacific (Zanzibar to Okinawa and Tonga)
P. okinawensis		27	10–15	I (12–3 o’clock)	heart	<15	1.8–2.3	240–300	115–150	<35	Japan (Okinawa)
P. madagascariensis		80	12–18	V	end of VC	<15	2–2.4	200–230	70–80	<100	Western Indian Ocean
P. platei		30	7–10	V	end of VC	<5	0.7–1.0	65–100	20–30	<60	Western Pacific (PNG to Hawaii & French Polynesia)
P. setoensis		20	8–12	V	end of VC	<5	0.9–1.2	80–85	15–25	<25	Japan (Wakayama)
P. griffithsi		25	6–10	V	end of VC (exc. heart)	<5	0.50–0.62	60–65	15–20	<25	Indo-West Pacific (Mauritius to Kei Islands & New Ireland)
P. sydneyensis		50	8–16	I (3–6 o’clock)	end of VC	<10	0.6–1.0	90–100	20–50	<30	Queensland, New South Wales & New Caledonia
P. willani		65	10–25	I (3–6 o’clock)	end of VC	<25	1.5–1.9	240–250	80–100	<37	Northern Territory
P. verruculata	#1	60 (exc. 73)	10–22	I (3–6 o’clock)	end of VC	<15	1.4–2.0	100–270	35–50	<50	Singapore to eastern Australia, New Caledonia & Japan
	#2	55	14–22			<10	1.4–1.7	140–160	30–35		Sumatra & Andaman
	#3	40	10–18				1.8–2.2	200–270	40–80	<60	Malaysia & Singapore
	#4	60					(1.3) 2.2–2.8	200	50		Western India, Pakistan & Persian Gulf
	#5	50	10–20				1.8–2.0	150–180	45–50	<55	Mozambique & Madagascar
	#6	40	10–18			<15	2.0–2.4	140–200	55–60		Red Sea