A methodological exploration to study 2D arm kinematics in Ophiuroidea (Echinodermata)

Table 1 The maximum and minimum values of sinuosity, arm angle and disc displacement in the three species studied (negative angles represent a clockwise direction)

Species/variables	Sinuosity		Arm angle		Disc displacement
	(Max)	(Min)	(Max)	(Min)	(Max)	(Min)	(Mean)
O. superba	1.40 _A5	1.0 _A3	− 37.9 _A5	− 0.1 _A4	13.24	1.43	5.22
O. scolopendrina	2.52 _A2	1.0 _A1	− 81.6 _A5	0.002 _A5	11.38	0.16	3.67
O. scolopendrina	2.52 _A2	1.0 _A1	− 81.6 _A5	− 0.3*_A4	11.38	2.44*	6.37*
M. hirsuta	21.3 _A5	1.0 _A2	− 146 _A3	− 0.2 _A2	11.24	0.50	4.60

‘A’ stands for ‘arm’, with the corresponding number. The asterisk ‘*’ indicates that the small juveniles O. scolopendrina were excluded

ISSN: 1742-9994