Actiniaria.com

The first photo shows a specimen with a very characteristic appearance, it has about 96 tentacles and characteristic white lines on the disk and tentacles. Similarly looking specimen is identified as Macrodactyla doreensis in the paper of Fautin, Crowther and Wallance (2008, Sea anemones (Cnidaria: Anthozoa: Actiniaria) of Moreton Bay). In the definition of the genus Macrodactyla these authors say it has only 48 tentacles, but the photos they give on the same page show many more.

The second photo shows a differently looking specimen with many more tentacles, and not so distinct white lines. Numerous similarly looking photos, identified as Macrodactyla doreensis can be found in the Internet and also in scientific papers (e.g. Fautin, Tan, Tan, 2009 - Sea Anemones (Cnidaria: Actiniaria) of Singapore). Is it the same species as on the first photo? Most probably not.

Originally Macrodactyla doreensis was described (as Actinia doreensis) by Quoy and Gaimard in their famous book published in 1833. The description they gave is short, but it states that the tentacles are not numerous and the figure they published (reproduced on the bottom of this webpage) shows only 21 tentacles. Of course this very old figure is too schematic. But can we say it shows the species currently known as Macrodactyla doreensis? Not sure, but most probably not.

The generic name Macrodactyla Haddon, 1898 (sea anemone) is preoccupied [see update below] by the generic name Macrodactyla Harris in Hitchcock, 1833 (Coeloptera - beetles). In other words, generic name Macrodactyla cannot be used as a valid name for sea anemone because it was used earlier for a beetle and must be replaced by a new name. Although this fact was first reported by Fautin et al in 2007 in a catalog of all genera of sea anemones, she continued to use Macrodactyla as a valid name in her papers (e.g. Fautin, Crowther, Wallace, 2008; Fautin, Tan, Tan, 2009). In 2016 Fautin resolved this situation by simply stating that all existing Macrodactyla species are "returned" to the genus Condylactis, so valid name for discussed here anemone, according to Fautin (2016), should be Condylactis doreensis. Fautin (2016), however, failed to provide any discussion or explain why she decided to move former Macrodactyla species to Condylactis.

Update 2023.
In their paper Yap, Mitchell, Quek, Tan, Tan and Huang (2023) showed, that Macrodactyla Haddon, 1898 (sea anemone) is not preoccupied by the Macrodactyla Harris in Hitchcock, 1833 used earlier in Coeloptera because the latter is an incorrect spelling of the coleopteran genus Macrodactylus. Thus, Macrodactyla can be used in sea anemones.
According to the same authors the genus Macrodactyla contains two species, Macrodactyla aspera (type species) and M. fautinae Yap, Mitchell, Quek, and Huang in Yap et. al, 2023. They formally placed Macrodactyla doreensis to the genus Heteractis (as earlier did Rowlett (2020) in his book "Indo-Pacific Corals"). The main problem I see here is the identification of the original Macrodactyla doreensis described by Quoy and Gaimard in 1833, it may be distinct from the species to which this name is currently applied.