Table 5. Predator evasion potential of orthocone cephalopods using mostly extant predators as analogues.

Dodges are considered successful (bold numbers) when the minimum distance required to start jetting (D) is less than the body length of a predator (L_p) moving at some incident velocity (V_p). The subscripts in D values refer to different thrust scenarios in the models (1: Nautilus-like cruising thrust; 2: Nautilus-like cruising thrust scaled by the higher mantle cavity ratio of Sepia; 3uc: Nautilus-like peak thrust with no coating; 3c: Nautilus-like peak thrust, coated in hydrophobic silicone spray). The velocity of Platecarpus (denoted by *) is only an estimate of metabolically optimal velocity (Motani, 2002), therefore critical/lunge velocity should be much higher.

					Moving one body length (57 cm)				Moving 1/2 body length (28.5 cm)
Species	Common name	Lp (m)	Vp (m/s)	Reference	D1 (m)	D2 (m)	D3uc (m)	D3c (m)	D1 (m)	D2 (m)	D3uc (m)	D3c (m)
Platecarpus	Mosasaur	4	0.38*	Motani, 2002	1.00	0.80	0.31	0.31	0.67	0.53	0.21	0.20
Megaptera novaeangliae	Humpback whale	12.7	5	Segre et al., 2020	13.17	10.51	4.13	4.08	8.78	6.98	2.76	2.68
Crocodylus porosus	Saltwater crocodile	5	8	Benga et al., 2010	21.06	16.81	6.61	6.52	14.04	11.16	4.42	4.28
Delphinus delphis	Short-beaked common dolphin	1.8	8	Tanaka et al., 2019	21.06	16.81	6.61	6.52	14.04	11.16	4.42	4.28
Stenella attenuata	Pantropical spotted dolphin	1.86	11	Tanaka et al., 2019	28.96	23.11	9.09	8.97	19.31	15.35	6.07	5.89
Isurus oxyrincus	Shortfin mako shark	2.1	19	Fernandez-Waid et al., 2019	50.03	39.92	15.69	15.49	33.35	26.51	10.49	10.17