Hmmmm....apparently you and Borneman disagree.
From a 1997 paper - (I've seen him repeat it in 2002 - but do not have his fine book in my possession, so perhaps he retracts this):
The most well known Euphyllia is what is commonly called hammer or anchor coral. The species is Euphyllia ancora. Although it is still commonly given the species name of E. fimbriata, this is a now extinct designation.
(1) Oddly enough, there are references in taxonomic literature to a feature that was thought to be a species difference between ancora and fimbriata. Classification of corals is based predominantly on skeletal characteristics, although living tissue can and does play a role in some classifications.
(2) This feature was that fimbriata species had T-shaped tentacle or polyp ends while ancora's were curved, or anchor shaped. While differences occasionally exist even within the same specimen, there is a very distinct pattern of examples with both end types. The polyps of all species can be either brown, greenish or slightly pinkish, with variations of the three common even within the same example
The different tentacle shapes appear to be considered polymorphisms, and not species specific characteristics. Euphyllia paraencora has different skeletal morphology from ancora, and thus is considered a separate and valid species.
I am not a coral expert but I've known a few ("its their job" coral guys), and there are definite limitations to the use of "soft tissue" morphology as species specific characteristics. I can look at some of my guys and see changes from day to day in some cases. I would buy that the hammer might be a variant of the anchor...whatever that means in taxonomy.
Anyway, I am sure he could be wrong, but after all of those extensive years of research on corals and their care...I tend to give him the benefit of the doubt.