Ancestral taxa
Domain: Eukaryota  [Taxonomy; edit]
(bô-hun-kip): Unikonta  [Taxonomy; edit]
(bô-hun-kip): Opisthokonta  [Taxonomy; edit]
(bô-hun-kip): Holozoa  [Taxonomy; edit]
(bô-hun-kip): Filozoa  [Taxonomy; edit]
Kài: Animalia  [Taxonomy; edit]
A-kài: Eumetazoa  [Taxonomy; edit]
Clade: Bilateria  [Taxonomy; edit]
Clade: Nephrozoa  [Taxonomy; edit]
(bô-hun-kip): Protostomia  [Taxonomy; edit]
(bô-hun-kip): Spiralia  [Taxonomy; edit]
Chhiau-mn̂g: Lophotrochozoa  [Taxonomy; edit]
Mn̂g: Mollusca  [Taxonomy; edit]
Kong: Gastropoda  [Taxonomy; edit]
Clade: Caenogastropoda  [Taxonomy; edit]
Clade: Hypsogastropoda  [Taxonomy; edit]
Clade: Littorinimorpha  [Taxonomy; edit]
Chhiau-kho: Truncatelloidea  [Taxonomy; edit]
Kho: Tateidae  [Taxonomy; edit]
Sio̍k: Hadopyrgus  [Taxonomy; edit]

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Parent: Tateidae [Taxonomy; edit]
Rank: genus (displays as Sio̍k)
Link: Hadopyrgus
Extinct: no
Always displayed: yes (major rank)
Taxonomic references: Climo, F. M. (1974). "Description and affinities of the subterranean molluscan fauna of New Zealand". New Zealand Journal of Zoology. 1 (3): 247–284. doi:10.1080/03014223.1974.9517834. ISSN 0301-4223. 
Parent's taxonomic references: