Table 1. Collection details and localities for the material studied.

Species	Repository	N1	Locality	Fixative	Length2 (mm)
N. gemma	AMS3 C.73050	8	Loc #042655 NSW: off Cronulla, Sidney(34°4’S, 151°14’S)	5% saltwaterformalin	10.3; 14.6; 16.5
N. lamarckii	AMS C.313607	2	Loc #021996 NSW: Sidney (33°53.000’S,151°13.000’E)	70% EtOH	20.2
N. margaritacea	AMS C.363610	2	Loc #0042671 NSW: 10 km E of Cape Banks,Sidney (33°59.500’S, 151°20.500’E)	5% saltwaterformalin	17.4
	AMS C.413365	2	Loc #54151 SA: off Ceduna (32°24.000’S,133°30.000’E)	5% saltwaterformalin	38.5
	P/UGR4	1	Port Stanvac, Adelaide, South Australia	2.5%glutaraldehyde	22.5
	P/UGR	2	Anxious Bay (S. Australia)	Dry	23.7; 27.6
	P/UGR	1	Near Adelaide (S Australia)	Dry	36.5
	P/UGR	1	Coffin Bay (S Australia)	Dry
	P/UGR	1	Loc. unknown	Dry
N. strangei	AMS C.413366	2	Loc #2404 WA: North West Shelf, NNE of PortHedland (19°55.200’S-19°55.600’S, 117°56.000’E–117°55.600’S)	5% saltwaterformalin	10.8; 17.5
N. uniophora	AMS C.413364	2	Loc #000677 QLD: off Moreton Bay(27°27.370’S, 153°39.000’E)	5% saltwaterformalin	20.0

¹Number of specimens studied (all with paired valves);

²Only specimens intact after the study;

³The Australian Museum (Sidney);

⁴Paleontology, University of Granada.