While looking to identify wild collected corals from the Caribbean basin of the Hispaniola Island, where I live, I found this useful photographic identification article (link at the end of this post).
Authored by Collin et al (2005) which is (at least to the day of this posting) open access, of the Caribbean Journal of Science. Anyone interested in identifying Caribbean inverts can download this pdf file.
Each species is presented with a good quality photograph (with scale bar), detailed identification information, as well as distribution and, when granted, additional notes.
Although based on a wide sample of marine inverts from a specific location (Bocas del Toro, Panama), keep in mind it is not an exhaustive list, some species are common to the Caribbean basin and of the Tropical Western Atlantic (e.g. Florida, Bahamas, Bermuda) while others, to date, are likely endemic. It covers a lot of species from the following phylum:
Phylum Poriferas (aka Sponges) from page 1 to 25 of the pdf file (pp. 638-662 of the original document);
Phylum Cnidaria (Corals) from page 25 to 44 of the pdf file (pp. 662-681 of the original document);
Phylum Nemerta (Worms) from page 45 to 51 of the pdf file (pp. 682-688 of the original document);
Phylum Molusca, order Ophistobranchia (Sea Slugs) from page 52 to 56 of the pdf file (pp. 689-693 of the original document);
Phylum Echinodermata (Star fish, Urchins, Sea Cucumber) from page 56 to 62 of the pdf file (pp. 693-699 of the original document); and
Phylum Urochordata (Tunicates) from page 62 to 70 of the pdf file (pp. 699-707 of the original document)
Please click in the link below to access it:
http://caribjsci.org/dec05%20Special...41_638-707.pdf
Upcoming special item at the end of 2009 will be focused on the Caribbean Reef.
Pepetj
Santo Domingo