Table 2. Definitions and descriptions of the morphological variables.

See Fig. 1 for an illustration of the point landmarks.

Name	Points	Description	Dame	Description
SL1	1:2	Septa length	NP	Number of pali
SL2	3:4	Septa length	TRI	Triplet
SL3	5:6	Septa length	FA	Fossa area
SL4	7:8	Septa length	CA	Calyx area
SL5	9:10	Septa length	NR	Number of radi
SL6	11:12	Septa length
SL7	13:14	Septa length	Proportional variables
SL8	15:16	Septa length	FACA	FA/CA
SL9	17:18	Septa length	X1	(20:24 + 4:10)/(5:7 + 19:21)
SL10	19:20	Septa length	X2	24:4/23:3
SL11	21:22	Septa length	X3	SW/(1:2:13:14)
SL12	23:24	Septa length	X4	12:16/11:15
SW1	25:26	Septa width	X5	13:14/L
SW2	27:28	Septa width	X6	1:2/L
SD1	1:3	Septa distance	X7	23:3/L
SD2	3:5	Septa distance	LAT	3:5 + 7:9 + 17:19 + 21:23/L
SD3	5:7	Septa distance
SD4	7:9	Septa distance
SD5	9:11	Septa distance
SD6	11:13	Septa distance	Averaged variables
SD7	13:15	Septa distance	APD	Avg (PD)
SD8	15:17	Septa distance	ASL	Avg (SL)
SD9	17:19	Septa distance	ASW	Avg (SW)
SD10	19:21	Septa distance	IRR*
SD11	21:23	Septa distance
SD12	23:1	Septa distance
PD1	2:4	Pali distance
PD2	4:6	Pali distance
PD3	6:8	Pali distance
PD4	8:10	Pali distance
PD5	10:12	Pali distance
PD6	12:14	Pali distance
PD7	14:16	Pali distance
PD8	16:18	Pali distance
PD9	18:20	Pali distance
PD10	20:22	Pali distance
PD11	22:24	Pali distance
PD12	24:2	Pali distance
FL1	20:8	Fossa width
FL2	2:14	Fossa length
W	7:19	Width
L	1:13	Length

Notes.

^*IRR (septal irregularity) was calculated as the sum of the absolute value of the differences between septal lengths.