Smaragdia tragena (Iredale, 1936)
Description: Shell with low spire, width less than height. Surface smooth and glossy. Columellar callus reflected onto body whorl as smooth, thick deck. Columella concave, with about 8 denticles centrally, decreasing in size from top to bottom. Outer lip sharp, smooth, simple. Colour white background, with reddish-brown flames descending from suture, and 6 or 7 spiral bands of brown or reddish-brown square or rectangular patches, sometimes outlined with darker brown. Operculum unknown.
Size: Up to 6 mm in height.
Distribution: Known from Australia, Papua New Guinea, Indonesia and Reunion. In Australia, a discontinuous distribution from Torres Strait southwards to Capricorn Group, Queensland, and then Port Stephens southwards to Sydney, NSW.
Habitat: In NSW, known only from estuaries, beach collected and down to 27 m. Rare.
Comparison: Larger than T. souverbiana with a different colour pattern.
Synonymy: Smaragdia abakionigraphis Drivas & Jay, 1989, described from Reunion, is this species.
Remarks: The Indonesia and Reunion records are based on literature reports of S. abakionigraphis.
Figs. 1,2: HOLOTYPE Sydney Harbour (C.060630)
Copyright Des Beechey 2005