Table 1.

Summary of marginal musculature dimensions within each character state

Muscle form	nsections	Length (μm)	Width (μm)	# of supports	Size of supports (μm)	Muscle CS-area (x 104 μm2)
Branchiform endodermal	20	2796–4623 $\left(\overline{\mathrm{x}}=3723\right)$	394–843 $\left(\overline{\mathrm{x}}=564\right)$	151–275 $\left(\overline{\mathrm{x}}=214\right)$	114–541 $\left(\overline{\mathrm{x}}=256\right)$	23.6–40.9 $\left(\overline{\mathrm{x}}=29.8\right)$
Cteniform endodermal	156	175–1251 $\left(\overline{\mathrm{x}}=534\right)$	29–291 $\left(\overline{\mathrm{x}}=77\right)$	7–79 $\left(\overline{\mathrm{x}}=32\right)$	9–90 $\left(\overline{\mathrm{x}}=32\right)$	0.1–4.2 $\left(\overline{\mathrm{x}}=1.09\right)$
Spindly-cteniform endodermal	10	268–331 $\left(\overline{\mathrm{x}}=298\right)$	34–65 $\left(\overline{\mathrm{x}}=52\right)$	10–16 $\left(\overline{\mathrm{x}}=15\right)$	15–36 $\left(\overline{\mathrm{x}}=27\right)$	0.3–0.5 $\left(\overline{\mathrm{x}}=0.4\right)$
Discontiguous endodermal	2	820–1049 $\left(\overline{\mathrm{x}}=935\right)$	68–78 $\left(\overline{\mathrm{x}}=73\right)$	46–60 $\left(\overline{\mathrm{x}}=53\right)$	34–49 $\left(\overline{\mathrm{x}}=41\right)$	0.7–2.4 $\left(\overline{\mathrm{x}}=1.57\right)$
Meso-endo transitional	36	756–1536 $\left(\overline{\mathrm{x}}=1023\right)$	114–263 $\left(\overline{\mathrm{x}}=168\right)$	47–110 $\left(\overline{\mathrm{x}}=71\right)$	77–200 $\left(\overline{\mathrm{x}}=119\right)$	1.3–5.2 $\left(\overline{\mathrm{x}}=2.77\right)$
Cyclically transitional	40	307–793 $\left(\overline{\mathrm{x}}=483\right)$	57–137 $\left(\overline{\mathrm{x}}=89\right)$	9–42 $\left(\overline{\mathrm{x}}=23\right)$	22–72 $\left(\overline{\mathrm{x}}=47\right)$	0.5–2.0 $\left(\overline{\mathrm{x}}=9.25\right)$
Discontiguous mesogleal	10	1111–1324 $\left(\overline{\mathrm{x}}=1192\right)$	153–271 $\left(\overline{\mathrm{x}}=224\right)$	130–184 $\left(\overline{\mathrm{x}}=151\right)$	32–76 $\left(\overline{\mathrm{x}}=54\right)$	1.3–2.0 $\left(\overline{\mathrm{x}}=1.73\right)$
Linear mesogleal	19	1219–3028 $\left(\overline{\mathrm{x}}=1982\right)$	86–419 $\left(\overline{\mathrm{x}}=273\right)$	69–136 $\left(\overline{\mathrm{x}}=110\right)$	25–107 $\left(\overline{\mathrm{x}}=66\right)$	1.3–12.9 $\left(\overline{\mathrm{x}}=5.0\right)$
Reticulate mesogleal	53	884–2080 $\left(\overline{\mathrm{x}}=1474\right)$	132–445 $\left(\overline{\mathrm{x}}=246\right)$	51–298 $\left(\overline{\mathrm{x}}=125\right)$	56–339 $\left(\overline{\mathrm{x}}=153\right)$	3.55–17.4 $\left(\overline{\mathrm{x}}=8.50\right)$
Orthogonally-reticulate esogleal	6	3652–4205 $\left(\overline{\mathrm{x}}=3892\right)$	264–350 $\left(\overline{\mathrm{x}}=314\right)$	628–834 $\left(\overline{\mathrm{x}}=740\right)$	31–65 $\left(\overline{\mathrm{x}}=46\right)$	44.2–48.2 $\left(\overline{\mathrm{x}}=4.65\right)$