Anthozoa - Scleractinia - Montlivaltiidae
Alternative spellings: Isastraea, Isstraea
Synonym: Placastrea Stoliczka 1873
Parent taxon: Montlivaltiidae according to H. Löser et al. 2009
Sister taxa: Brevimaeandra, Ceratothecia, Clausastrea, Coenotheca, Complexastraeopsis, Complexastraeopsis, Complexastrea, Cyathophylliopsis, Dimorphocoenia, Elasmophyllia, Ellipsosmilia, Goldfussastraea, Goldfussastrea, Maeandramorpha, Mapucheastrea, Margarastreopsis, Montlivaltiinae, Montlivaltoides, Nerthastraea, Neuquinosmilia, Paraclausastraea, Paraphyllogyra, Peplosmilia, Placosmilia, Placosmiliinae, Puschastraea, Rhabdophyllia, Thecomeandra, Thecosmiliopsis, Trochophyllia, Trochosmilia
Subtaxa: Isastraea arachnoidea, Isastrea alimena, Isastrea angulosa, Isastrea bernardi, Isastrea bernardiana, Isastrea bernensis, Isastrea browni, Isastrea cesarensis, Isastrea collignoni, Isastrea crassa, Isastrea crassisepta, Isastrea deligata, Isastrea elegans, Isastrea elegans, Isastrea excentrica, Isastrea explanata, Isastrea explanulata, Isastrea fallax, Isastrea favosiformis, Isastrea fromenteli, Isastrea goldfussi, Isastrea greppini, Isastrea gresslyi, Isastrea haueri, Isastrea helianthoides, Isastrea hemisphaerica, Isastrea hourcqi, Isastrea incerta, Isastrea kosodeensis, Isastrea limitata, Isastrea marcoui, Isastrea matumotoi, Isastrea nantuacumensis, Isastrea neocomiensis, Isastrea parvistella, Isastrea propinqua, Isastrea qingyanensis, Isastrea rariseptata, Isastrea richardsoni, Isastrea robusta, Isastrea salinaria, Isastrea salinensis, Isastrea sinemuriensis, Isastrea splendida, Isastrea sugiyamai, Isastrea superficialis, Isastrea taruensis, Isastrea tenuisepta, Isastrea tenuistriata, Isastrea whitneyi, Isastrea yuraensis
Ecology: stationary intermediate-level epifaunal photosymbiotic-suspension feeder