• Peridinium trichoceros: Ehrenberg C.G. (1860)

The cell is thecate, of large dimensions, solitary. The body of the cell is wide. The triangular epitheca narrows into an apical horn. The hypotheca is prolonged into two highly developed antapical horns, which curve until they are almost parallel to the apical horn.

Cosmopolitan, marine, reported in warm to tropical waters.

Distribution: Ireland: Galway (Boyd, 1973); Europe: Great Britain (Parke & Dixon, 1976), Croatia (Vilicic et al., 2009), Ireland (Boyd, 1973, McDermott & Raine, 2006), Romania (Caraus, 2002); Atlantic Islands: Canary Islands (Gil-Rodríguezet al., 2003).
North America: Nova Scotia (Kim, Garbary and McLachlan, 2004); Australia and New Zealand: Victoria (Day et al., 1995); Antarctic and the subantarctic islands: Antarctica (McMinn & Scott, 2005).

The algae of Romania., Studii si Cercetari, Universitatea Bacau, Biologie 7, Caraus I., 2002, 1-694

Plankton species, some new to the area, obtained in Galway Bay by use of a plankton pump., Irish Naturalists' Journal 17:, Boyd R.J., 1973, 330-335

Bibliographic check-list of non-marine algae in Australia., Flora of Australia Supplementary Series 4, Day S.A., Wickham R.P., Entwisle T.J., Tyler P.A., 1995, 1-276

Phytoplankton dynamics in Pomquet Harbour, Nova Scotia: a lagoon in the southern Gulf of St., Lawrence. Phycologia 43, Kim K.Y., Garbary D.J., McLachlan J.L., 2004, 311-328.

Neoceratium gen. nov., a new genus for all marine species currently assigned to Ceratium (Dinophyceae)., Protist 161, Gómez F., Moreira D. e López-Garcia P., 2010, 35-54

Check-list of British marine algae - third revision., Journal of the Marine Biological Association of the United Kingdom 56, Parke M., Dixon P.S., 1976, 527-594.

Dinoflagellates. In: Antarctic marine protists., (Scott, F.J. e Marchant, H.J. Eds)Canberra & Hobart: Australian Biological Resources Study; Australian Antarctic Division., McMinn A. e Scott F.J., 2005, 202-250.

Composition and annual cycle of phytoplankton assemblages in the northeastern Adriatic Sea., Botanica Marina 52(4), Vilicic, Djakovac, Buric, Z. & Bosak, 2009, 291-305.

The dinoflagellate genus Ceratium in Irish shelf seas., Galway: Martin Ryan Institute., McDermott G., Raine R., 2006, pp. [viii] + 1-86

Proctoctista. In: Lista de especies marinas de Canarias (algas, hongos, plantas y animales). (Moro, L., Martín, J.L., Garrido, M.J. & Izquierdo, I. Eds), Las Palmas: Consejería de Política Territorial y Medio Ambiente del Gobierno de Canarias., Gil-Rodríguez M.C., Haroun R., Ojeda Rodríguez A., Berecibar Zugasti E., Domínguez Santana P., Herrera Morán B., 2003, 5 - 30