Plakortis

Plakortis is a genus of marine sponges in the order Homosclerophorida, first described by Franz Eilhard Schulze in 1880.

Description
Plakortis sponges are characterised by having:
 * 1) inorganic (spicular) skeletal complement
 * 2) Skeleton composed mainly of diods, triods, and/or calthrops in one size class
 * 3) Lophose diods, triods, or calthrops complement the main skeleton of non-lophose spicules
 * 4) no lophose spicules
 * 5) diactinal "microscleres" (microrhabs) in some species

Species
List of accepted species:
 * Plakortis albicans Cruz-Barraza & Carballo, 2005
 * Plakortis angulospiculatus (Carter, 1879)
 * Plakortis badabaluensis Ubare & Mohan, 2016
 * Plakortis bergquistae Muricy, 2011
 * Plakortis clarionensis Cruz-Barraza, Vega & Carballo, 2014
 * Plakortis communis Muricy, 2011
 * Plakortis copiosa Pulitzer-Finali, 1993
 * Plakortis dariae Ereskovsky, Lavrov & Willenz, 2014
 * Plakortis deweerdtaephila Vicente, Zea & Hill, 2016
 * Plakortis edwardsi Ereskovsky, Lavrov & Willenz, 2014
 * Plakortis erythraena Lévi, 1958
 * Plakortis fromontae Muricy, 2011
 * Plakortis galapagensis Desqueyroux-Faúndez & van Soest, 1997
 * Plakortis halichondrioides (Wilson, 1902)
 * Plakortis hooperi Muricy, 2011
 * Plakortis insularis Moraes & Muricy, 2003
 * Plakortis japonica (Hoshino, 1977)
 * Plakortis kenyensis Pulitzer-Finali, 1993
 * Plakortis lita de Laubenfels, 1954
 * Plakortis mesophotica Idan, Shefer, Feldstein & Ilan, 2021
 * Plakortis microrhabdifera Moraes & Muricy, 2003
 * Plakortis myrae Ereskovsky, Lavrov & Willenz, 2014
 * Plakortis nigra Lévi, 1953
 * Plakortis petrupaulensis Domingos, Moraes & Muricy, 2013
 * Plakortis potiguarensis Domingos, Moraes & Muricy, 2013
 * Plakortis pulvillus Samaai, Pillay & Janson, 2019
 * Plakortis quasiamphiaster Díaz & van Soest, 1994
 * Plakortis ruetzleri Lage, Muricy, Ruiz & Pérez, 2018
 * Plakortis simplex Schulze, 1880
 * Plakortis spinalis Domingos, Moraes & Muricy, 2013
 * Plakortis symbiotica Vicente, Zea & Hill, 2016
 * Plakortis zyggompha (de Laubenfels, 1934)