Belongs within: Scleractinia.
The Montastreinae are colonial corals multiplying by extratentacular budding.
<==MontastreinaePR72
|--Solenastrea bournoniPR72
|--Cyphastrea Edwards & Haime 1848PR72, V90
| |--C. agassizi (Vaughan 1907)M09
| |--C. chalcidicum (Forsskål 1775)RSM14
| |--C. microphthalma (Lamarck 1816)M09
| |--C. ocillinaPR72
| `--C. serailia (Forsskål 1775)RSM14
|--Leptastrea Edwards & Haime 1848PR72, V90
| |--L. aequalis Veron 2000M09
| |--L. bottae (Edwards & Haime 1849)V90
| |--L. inaequalis Klunzinger 1879M09
| |--L. pruinosa Crossland 1952M09
| |--L. purpurea (Dana 1846)M09
| `--L. transversa Klunzinger 1879M09
`--Montastrea de Blainville 1830V90
|--M. annularisPR72
|--M. annuligera (Milne Edwards & Haime 1849)M09
|--M. brazilianaPR72
|--M. cavernosaPR72
|--M. curta (Dana 1846)M09
|--M. faveolataPB07
|--M. franksiRB14
|--M. magnistellata Chevalier 1971M09
`--M. valenciennesi (Milne Edwards & Haime 1848)M09
*Type species of generic name indicated
References
[M09] McKinney, D. 2009. A survey of the scleractinian corals at Mermaid, Scott, and Seringapatam Reefs, Western Australia. Records of the Western Australian Museum Supplement 77: 105–143.
[PB07] Philippe, H., H. Brinkmann, P. Martinez, M. Riutort & J. Baguña. 2007. Acoel flatworms are not Platyhelminthes: evidence from phylogenomics. PLoS One 2 (8): e717.
[PR72] Powers, D. A., & F. J. Rohlf. 1972. A numerical taxonomic study of Caribbean and Hawaiian reef corals. Systematic Zoology 21 (1): 53–64.
[RSM14] Richards, Z. T., A. Sampey & L. Marsh. 2014. Kimberley marine biota. Historical data: scleractinian corals. Records of the Western Australian Museum Supplement 84: 111–132.
[RB14] Rodríguez, E., M. S. Barbeitos, M. R. Brugler, L. M. Crowley, A. Grajales, L. Gusmão, V. Häussermann, A. Reft & M. Daly. 2014. Hidden among sea anemones: the first comprehensive phylogenetic reconstruction of the order Actiniaria (Cnidaria, Anthozoa, Hexacorallia) reveals a novel group of hexacorals. PLoS One 9 (5): e96998.
[V90] Veron, J. E. N. 1990. Re-examination of the reef corals of Cocos (Keeling) Atoll. Records of the Western Australian Museum 14 (4): 553–581.