Figure 25 in Fossils reveal a high diversity of the staghorn coral genera Acropora and Isopora (Scleractinia: Acroporidae) in the Neogene of Indonesia

Figure 25. Acropora horrida. NHMUK PI AZ 7104, TF518, Kampung Narut, East Kalimantan, Late Miocene to Early Pliocene (5–8 Ma). A, thicket of A. horrida preserved in a silt-rich sediment matrix. B, detail of colony in the field showing arborescent colony form. C–E, AZ 7104a–c, fragments of irregular slender branches. F, AZ 7104c, electron micrograph of a corallite. G, AZ 7104d, electron micrograph of branch tip with appressed tubular corallites. H, AZ 7104d, electron micrograph of axial corallite. I, AZ 7104c, detail of coenosteum in between corallites formed of simple spinules arranged into costae.