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Calthalotia fragum (Philippi, 1848) Description: Whorls straight sided, sharply angled at the base. Spiral sculpture of about 5 beaded ribs on each whorl and about 8 on the base, with finer ribs between on larger specimens; Ribs immediately above and below the suture frequently larger than the rest. Outer lip and columella smooth, umbilicus closed. Colour mottled brown and white, sometimes as axial white streaks on a brown background. Interior white, nacreous. Normally eroded. Size: Up to 25 mm high. Distribution: Endemic to Australia; Southport, Qld, to Mallacoota, Vic. Habitat: Abundant in estuarine seagrass beds. Comparison: Odontotrochus marginata (Tenison-Woods, 1880) is a very similar species which occurs in southern Queensland and northwards. Synonym: Prothalotia comtessei Iredale, 1931; Odontotrochus indistinctus (Wood, 1828) Figs. 1,2: Kurnell, Botany Bay, NSW (C.326563) Page change record: Illustrated specimen changed 25 Apr 2007.
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