Table 1.

Status of mineralized sesamoids and lunulae amongst 19 specimens of Sphenodon (Rhynchocephalia)

Specimen	Mature	SVL (cm)	B‐P	Ulnar patella	Palmar	MC	PP (manus)	Tibial patella	Tibial lunula	Fibular lunula	Tibiofemoral lunulae	MTI‐AC	MT	PP (pes)	Ulnar	Plantar
UMZC R2602	No	16.0	n/a	A	A	A	A	A	A	A	A	A	A	A	A	A
S15	No	14.0	A	A	A	A	A	A	A	A	A	A	A	A	A	A
S16	No	18.0	A	A	A	A	P	A	A	A	A	A	A	A	A	A
UMZC R2603	No	?	n/a	A	P	A	P	A	P	A	A	A	A	P	A	A
UMZC R2596	No	19.0	A	A	A	A	P	A	P	A	V	A	A	P	A	A
UMZC R2598	No	?	n/a	A	A	A	P	A	P	A	A	A	A	P	A	A
NH.3.116	No	21.0	n/a	n/a	A	A	P	A	P	A	A	A	A	P	A	A
UMZC R2616	Almost	26.0	n/a	n/a	n/a	n/a	n/a	A	P	A	A	A	A	A	n/a	A
UMZC R2609	Yes	22.5	n/a	n/a	n/a	n/a	n/a	A	P	A	V (left only)	P (left only)	A	P	n/a	A
UMZC R2615	Yes	24.0	n/a	n/a	n/a	n/a	P	A	P	A	A	P	A	P	n/a	A
UMZC R2609	Yes	?	A	A	A	A	P	A	P	A	V	A	A	P	P	A
UMZC R2605	Yes	22.0	A	A	A	A	P	A	P	A	V	A	A	P	P	A
UMZC R2607	Yes	22.0	n/a	A	P	A	P	A	P	A	A	P	A	P	A	A
UMZC R2595	Yes	25.0	A	A	P	A	P	A	P	A	A	P	A	P	A	P
BMNH 1969.2204	Yes	24.5	n/a	n/a	P	A	P	A	P	A	D (right) V (left)	P	A	P	A	A
S1/MEHJ#1	Yes	21.0	A	A	P	A	P	P	P	A	A	P	A	P	A	P
UMZC R2604	Yes	18.5	A	A	P	A	P	P	P	A	V	P	A	P	P (left only)	A
NH.84.19	Yes	21.0	A	A	P	A	P	P	P	A	V	P	A	P	A	A
BMNH 1935.12.6.1	Yes	22.5	n/a	n/a	P	A	P	P	P	A	D (left only)	P	A	P	A	P

A= absent; D = dorsal; P = present; V = ventral; SVL = snout‐vent length; B‐P = Basipterygoid‐pterygoid; MC = metacarpal; PP = penultimate phalangeal; MTI‐AC = metatarsal I‐astragalocalcaneal; MT = metatarsal; n/a = not assessed (incomplete specimen or scan);? = unknown.