In Astralium a very rapidly enlarging whorl starts from the multispiral nucleus, forming far the greater portion of the operculum, and usually leaving a pit at the starting point.
Distribution
This marine genus has a wide distribution ranging from the Eastern Indian Ocean to China and Japan, the Philippines, Indonesia, East India, the Maldives and Australia (New South Wales, Northern Territory, Queensland, South Australia, Tasmania, Victoria, Western Australia).
Species
According to the World Register of Marine Species (WoRMS), the following species are included within the genus Astralium :
Astralium asteriscum (Reeve, 1843)
Astralium calcar (Linnaeus, 1758)
Astralium confragosum (Gould, 1851)
Astralium danieli (Alf & Kreipl, 2006)
Astralium haematragum (Menke, 1829)
Astralium heimburgi (Dunker, 1882)
Astralium lapillus Reeve, 1863
Astralium latispina (Philippi, 1844)
Astralium milloni (B. Salvat, F. Salvat & Richard, 1973)
Astralium nakamineae (Habe & Okutani, 1981)
Astralium okamotoi Kuroda & Habe, 1961
Astralium pileolum (Reeve, 1842)
Astralium provisorium Schepman, 1908
Astralium rhodostomum (Lamarck, 1822)
Astralium rotularium (Lamarck, 1822)
Astralium saturnum Chino, 1999
Astralium semicostatum (Kiener, 1850)
Astralium stellare (Gmelin, 1791)
Astralium tentoriiforme (Jonas, 1845)
Astralium tentorium (Thiele, 1930)
Astralium wallisi (Iredale, 1937)
Another number of species are also mentioned in the Indo-Pacific Molluscan Database :
Astralium (Astralium) loochooensis (Mcneil, 1960): Possibly mistook of Buccinaria loochooensis MacNeil, 1961, the nearest match.
Astralium turcicus Reeve, 1848
Astralium yamamurae Habe & Kosuge, 1966
Species brought into synonymy
Astralium abyssorum Schepman, 1908: synonym of Bolma henica (Watson, 1885)
Astralium americanum (Gmelin, 1791): synonym of Lithopoma americanum (Gmelin, 1791)
Astralium andersoni E.A. Smith, 1902: synonym of Bolma andersoni (E. A. Smith, 1902)
Astralium aureolum Hedley, 1907: synonym of Bolma aureola (Hedley, 1907)
Astralium aureum (Jonas, 1844): synonym of Bellastraea aurea (Jonas, 1844)
Astralium bathyrhaphe Smith, 1899: synonym of Bolma bathyraphis (E. A. Smith, 1899)
Astralium brevispina (Lamarck, 1822): synonym of Lithopoma brevispina (Lamarck, 1822)