Table 5. Thickness of the exoskeleton (in µm) in Bougainvilliidae and other Hydroidolina.

Species	Inner layer (= perisarc)						Outer layer (=exosarc)
	1	2	3	4	5	6	1	2	3	4	5
“Anthoathecata”
Pennariidae
Pennaria disticha	7.5	81.9–59.0	14.7	x	x	x	2.4	25.1–12.2	1.2	1.1	x
Bougainvilliidae
Bimeria vestita	14.2	6.7	4.0	2.9	24.0	x	31.1	34.6	3.1	11.0	21.0
Bougainvillia muscus	25.2	20.5	4.6	1.4	x	x	5.4	3.1	8.4	1.8	x
Bougainvillia rugosa	11.1	14.7	x	1.6	2.9	x	x	132.5	15.0	5.0	3.9
Bougainvillia sp.	x	13.9	7.3	12.8	7.1	x	x	11.8	21.7	74.6	0.8
Dicoryne conferta	x	18.9	69.6	x	9.8	x	x	16.3	9.4	x	5.6
Garveia annulata	42.7	11.7	x	14.1	28.5	x	x	9.2	x	2.7	4.0
Garveia franciscana	x	24.9	14.9	3.6	6.0	x	x	17.0	11.8	9.9	6.2
Garveia gracilis	x	20.9	4.2	3.6	x	x	x	3.1	11.9	28.0	x
Garveia nutans	x	16.4	12.4	3.6	1.6	x	x	10.5	5.8	8.8	1.8
Pachycordyle michaeli	x	15.4–13.7	x	x	9.8	x	ø	ø	ø	ø	ø
Parawrightia robusta	x	7.0	x	5.1	x	x	x	96.6	x	15.4	x
Rhizorhagium sp.	18.5	14.9–10.3	x	2.1	x	2.1	18.6	8.5–1.4	x	2.7	x
Eudendriidae
Eudendrium carneum	x	27.4–8.9	2.9	x	x	x	x	5.3–4.4	1.2	x	x
Oceaniidae
Turritopsis sp.	5.4	9.1	x	1.4	x	x	ø	ø	ø	ø	ø
Pandeidae
Leuckartiara cf. octona	9.6	9.2	x	2.8–1.6	x	1.1	29.4	16.8	x	67.5–9.0	x
Leptothecata
Haleciidae
Halecium bermudense	x	15.2–4.3	2.0	1.3	12.9	x	ø	ø	ø	ø	ø
Clytiidae
Clytia gracilis	11.6	4.9	x	3.7	7.5	x	ø	ø	ø	ø	ø
Orthopyxis sargassicola	11.6	9.1	x	3.0	6.7	x	ø	ø	ø	øø	ø
Family Obeliidae
Obelia dichotoma	9.7	9.7	x	2.9	2.5	x	ø	ø	ø	ø	ø

Notes.

1

hydrorriza

2

hydrocaulus

3

side-branch

4

hydranth

5

gonophore

x

not data

ø

without layer