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Umbonium costatum
Umbonium costatum (Kiener, 1838)
Costate button top
Umbonium costatum
photo by FAO

Family:  Trochidae (Top shells)
Max. size:  3.5 cm SHL (male/unsexed)
Environment:  benthic; marine; depth range 0 - 20 m
Distribution:  Western Pacific.
Diagnosis:  Shell is small and discoidal, similar to Umbonium elegans but the surface is sculptured with fine concentric grooves. The umbilicus is smaller and less inflated and the color may vary but is mainly dark greenish-grey with yellow streaks and pink sutures. The umbilicus is dark brown to black and the aperture is nacreous green.
Biology:  Found in open coasts. Occurs at the low tide mark (Ref. 349).
IUCN Red List Status: Not Evaluated (N.E.) Ref. 123251)
Threat to humans:  harmless
Country info:   
 

Source and more info: www.sealifebase.org. For personal, classroom, and other internal use only. Not for publication.



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