Table 2.

Length and width ranges, in microns, for spicules and gemmules of living species of Heterorotula.

Species	ML	MW	LBL	SBL	BSW	PRD	DRD	GW
H.capewelli	195–330	13–18	38–52	34–45	3–4	24–45	20–23	510–560
H.nigra	224–360	7–13	56–73	35–48	2–4	13–16	10–14	230–360
H.multidentata	284–320	10–18	64–84	32–48	4–6	19–22	17–20	490–580
H.kakahunesis	185–260	9–12	30–42			17–22		380–540
H.multiformis	330–420	13–20	35–52	24–44	2–4	14–24	14–18	480–680
H.caldonensis	250–410	8–20	35–85		4	19–26	18–22	450–600
H.controversa	210–395	12–21	21–57		3–4	20–24	18–21	470–590
H.lucasi	223–335	7.7–13.7	19.8–48.6		2.7–4.4	19.4–24.4	16.6–21.7	448–613

Range values positioned between columns indicate no separation into two distinct size classes for that variable. Legend: ML megasclere length; MW megasclere width; LBL large birotule length; SBL small birotule length; BSW birotule shaft width; PRD proximal rotule diameter; DRD distal rotule diameter, GW gemmule width.