Plakina, Schulze, 1880

Lage, Anaíra, Araujo, Hannah Paola Mota, Gerovasileiou, Vasilis & Muricy, Guilherme, 2018, A new cave-dwelling species of Plakina (Porifera: Homoscleromorpha) from Crete, Greece (South Aegean Sea), Zootaxa 4466 (1), pp. 39-48 : 40

Genus PLAKINA Schulze, 1880

Type species. Plakina monolopha Schulze, 1880 .

Synonyms. [ Achinoe ] Gray, 1867: 546 (unavailable name). Plakina Schulze, 1880: 448 . Placina Topsent, 1890: 231 . Plakoosa de Laubenfels, 1936: 462 (after Topsent 1937: 7).

Definition. Encrusting Plakinidae usually with diods, triods, calthrops (all may be absent), and always with at least one type of homolophose calthrops, which may have one to four lophate actines and different ramification patterns. Irregular spicules are common and intraspecific variation in spicule shape may be high. One species has papillae and a microcavity-filling habit, and in another species the skeleton is absent ( Ruiz et al. 2017; Lage et al. 2018).