| Thaumastus |
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| Apertural and abapertural views of a shell of Thaumastus flori |
| Scientific classification |
| Domain: |
Eukaryota |
| Kingdom: |
Animalia |
| Phylum: |
Mollusca |
| Class: |
Gastropoda |
| Order: |
Stylommatophora |
| Suborder: |
Helicina |
| Superfamily: |
Orthalicoidea |
| Family: |
Megaspiridae |
| Genus: |
Thaumastus Albers, 1860 |
| Type species |
Bulimus hartwegi
L. Pfeiffer, 1846 |
| Synonyms |
- Atahualpa Strebel, 1910
- Bulimulus (Thaumastus) E. von Martens, 1860 (original rank)
- Bulimus (Orphnus) Albers, 1850 (invalid: junior homonym of Orphnus McLeay, 1819; Orphaicus is a replacement name)
- Bulimus (Orphus) (misspelling)
- Bulimus (Thaumastus) E. von Martens, 1860 (now: synonym of full genus)
- Orphnus Albers, 1850
- Orphaicus Schaufuss, 1869
- Pachytholus Strebel, 1909
- Strophocheilus (Thaumastus) E. von Martens, 1860 (now: synonym of full genus)
- Tatutor Jousseaume, 1887
- Thaumastus (Atahualpa) (junior synonymy)
- Thaumastus (Thaumastiella) Weyrauch, 1956· accepted, alternate representation
- Thaumastus (Thaumastus) E. von Martens, 1860· accepted, alternate representation
- Tholus Strebel, 1909
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Thaumastus is a genus of tropical air-breathing land snails, terrestrial pulmonate gastropod molluscs in the family Megaspiridae.