Belongs within: Heterobranchia.
The Architectonicoidea is a group of marine gastropods uniting the Architectonicidae with related fossil families. The Architectonicidae, sundails, have discoidal or depressed-conical shells with a rather flat base, often with a very widely open umbilicus within which the coiled whorls are visible, and a sculpture of beaded spiral and radial ribs (Wilson & Gillett 1971).
<==Architectonicoidea [Architectonicacea]
|--Cassianaxis Bandel 1994 [Cassianaxidae] BR05
|--Amphitomaria Koken 1897 [Amphitomariidae] BR05
| `--*A. cassiana (Koken 1889) [=Euomphalus cassianus, Discohelix (*Amphitomaria) cassiana] KC60
`--Architectonicidae [Architectomidae, Architectonicinae, Heliacidae, Solariacea, Solariadae, Solariidae] BR05
|--Teretropoma Rochebrune 1881 [Teretropomatinae, Teretropomidae] BR05
|--Mangonuia Mestayer 1930 [Mangonuiidae] BR05
|--Pseudomalaxis Fischer 1885 [Pseudomalaxinae] BR05
|--Grandeliacus Iredale 1957 WG71
| `--G. moretensenae Iredale 1957 WG71
|--Wangaloa Finlay 1927 F27b
| `--*W. plana (Marshall 1917) (see below for synonymy) F27b
|--Episcynia Mörch 1878 F27b
| `--*E. inornata [=Solarium inornatum] F27b
|--Philippia Gray 1847 [Philippiinae] BR05
| |--P. lutea (Lamarck 1822) F27a
| `--P. radiata (Röding 1798) WG71
|--Torinia Gray 1842 [Toriniacea, Toriniidae, Toriniinae] BR05
| |--T. caelata (Hinds 1844) [=Solarium caelatum] H09
| |--T. dorsuosa (Hinds 1844) [=Solarium dorsuosum] H09
| `--T. variegata (Gmelin 1791) WG71 [=Trochus variegatus] H09
|--Heliacus d’Orbigny 1842 [Heliacinae] BR05
| |--H. amoenus (Murdoch & Suter 1906) [=Omalaxis amoenus] F27a
| |--H. imperfectus (n. d.) F27a
| `--H. stamineus (Gmelin 1791) [incl. H. variegatus (Gmelin 1791)] F27a
|--Solarium Lamarck 1799 [Solariinae] BR05
| |--S. acutum Conrad 1860 F27b
| |--S. implexum Mighels 1845 J49
| |--S. mighelsi Philippi 1853 [=S. cyclostomum Mighels 1845 non Menke 1930] J49
| `--S. wannonensis Tenison-Woods 1878 F71
`--Architectonica Röding 1798 [=Architectoma (l. c.)] BR05
|--A. aucklandica (Marshall 1918) [=Heliacus aucklandicus] F27a
|--A. balcombensis Finlay 1927 [=Solarium acutum Tenison-Woods 1879 non Conrad 1860] F27b
|--A. hybrida (Linnaeus 1758) [=Trochus hybridus] H09
|--A. inornata Gabb 1864 F27b
|--A. marwicki Allan 1926 F27a
|--A. maxima Philippi 1848 WG71
|--A. ngaparaensis Suter 1917 F27a
|--A. perdix (Hinds 1844) WG71 [=Solarium perdix H09]
|--A. perspectiva (Linnaeus 1758) WG71 [=Trochus perspectivus H09]
| |--A. p. perspectiva WG71
| `--A. p. fressa Iredale 1936 WG71
|--A. plana (Seeley 1861) [=Solarium planum] F27b
|--A. reevei Hanley 1862 [incl. A. offlexa Iredale 1931] WG71
`--A. straminea (Gmelin 1791) [=Trochus stramineus] H09
*Wangaloa plana (Marshall 1917) [=Omalaxis planus; incl. Architectonica inornata Marshall 1917 non Gabb 1864] F27b
*Type species of generic name indicated
REFERENCES
[BR05] Bouchet, P., J.-P. Rocroi, J. Frýda, B. Hausdorf, W. Ponder, Á. Valdés & A. Warén. 2005. Classification and nomenclator of gastropod families. Malacologia 47 (1-2): 1-397.
[F27a] Finlay, H. J. 1927a. A further commentary on New Zealand molluscan systematics. Transactions and Proceedings of the New Zealand Institute 57: 320-485.
[F27b] Finlay, H. J. 1927b. New specific names for austral Mollusca. Transactions and Proceedings of the New Zealand Institute 57: 488-533.
[F71] Fletcher, H. O. 1971. Catalogue of type specimens of fossils in the Australian Museum, Sydney. Australian Museum Memoir 13: 1-167.
[H09] Hedley, C. 1909. The Marine Fauna of Queensland: Address by the President of Section D. Australasian Association for the Advancement of Science: Brisbane.
[J49] Johnson, R. I. 1949. Jesse Wedgwood Mighels with a bibliography and a catalogue of his species. Occasional Papers on Mollusks 1 (14): 213-231.
[KC60] Knight, J. B., L. R. Cox, A. M. Keen, R. L. Batten, E. L. Yochelson & R. Robertson. 1960. Gastropoda: systematic descriptions. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt I. Mollusca 1: Mollusca—General Features, Scaphopoda, Amphineura, Monoplacophora, Gastropoda—General Features, Archaeogastropoda and some (mainly Paleozoic) Caenogastropoda and Opisthobranchia, pp. I169-I331. Geological Society of America, and University of Kansas Press.
[WG71] Wilson, B. R., & K. Gillett. 1971. Australian Shells: illustrating and describing 600 species of marine gastropods found in Australian waters. A. H. & A. W. Reed: Sydney.
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