Littoraria filosa (Sowerby, 1832)
Description: Shell lightweight, whorls rounded, occasionally with up to 4 varices. Fourth whorl of teleoconch with 5-7 thin, fine, spiral grooves. Body whorl with 9-11 strong, narrow, raised, sharp, spiral ribs with interspaces 3-5 times rib width; interspaces with numerous spiral threads and grooves. Columella smooth, thin, curved, not excavated; outer lip thin. Colour very variable; brown, yellow, orange or pink, with or without pattern of brown dashes or stripes. Operculum corneous.
Size: Adults 16-35 mm in height.
Distribution: Northern Australia, south coast of Papua New Guinea and southern Indonesia. In Australia, from Exmouth Gulf, WA, around northern Australia to Botany Bay, NSW.
Habitat: Lives on leaves and trunks of the mangrove Avicennia marina, 0.2-3.0 m. above ground, and less commonly on other mangroves. Common in the tropics, rare in NSW.
Comparison: See L. luteola.
Synonymy: Formerly frequently misidentified as Littorina scabra (Linnaeus, 1758), but see remarks under L. luteola.
Remarks: This species is common in Queensland, but in NSW is known from only one specimen, from Botany Bay.
Figs. 1,2: Hervey Bay, Queensland (C.064270)
Copyright Des Beechey 2005