Terrazoanthus The order Zoantharia Rafinesque, 1815 (Cnidaria, Anthozoa: Hexacorallia): supraspecific classification and nomenclature Low, Martyn E. Y. Sinniger, Frederic Reimer, James Davis ZooKeys 2016 2016-12-14 641 1 80 47A35AE5-A3F8-50C2-A899-3E421C70175F Reimer & Fujii, 2010 Reimer & Fujii 2010 Anthozoa Hydrozoanthidae Terrazoanthus CoL Animalia Terrazoanthus Zoantharia 9 10 Cnidaria genus   TerrazoanthusReimer & Fujii, 2010: 20.  Type species.   Terrazoanthus onoiReimer & Fujii, 2010, by original designation.  Gender. Masculine.  Diagnosis. This genus is characterised by being a member of the Hydrozoanthidaethat is found on rocky substrates (as opposed to being obligate symbionts with hydrozoans). Some species in this genus are also brightly coloured (see Reimer and Fujii 2010: 20).   Remarks. Sphincter muscle transitional, with distal half mesogleal and proximal half endodermal, with encrustations to endodermal surface of mesoglea ( Swain and Swain 2014) (=meso-endo transitional [ Swain et al. 2015]), although  Terrazoanthus minutus(Duerden, 1898) has a simplified mesogleal sphincter muscle ( Swain et al. 2015). Described species currently referable to the genus  Terrazoanthusare mainly from the East Pacific, with  Terrazoanthus minutusfrom the Caribbean, and it is likely that several more undescribed species exist in the Atlantic (see Reimer et al. 2010a, 2012a) and in the Central Indo-Pacific region ( Reimer et al. 2014b). The diagnosis of  Terrazoanthusis in need of revision with the placement of  Terrazoanthus patagonichus(Carlgren, 1898) into this genus by Swain et al. (2015)as this species is associated with hydroids ( McMurrich 1904).