SEM images of atrial region of Paragrantia waguensis and its atrial spicules. a overview of atrial surface with atrial chambers b detail of atrial apopylar chambers showing the position of the apopylar spicules c apopylar spicules c1 details of apical actines of c d atrial triactine e atrial tetractines.

 
 
  Part of: Van Soest RWM, Hoeksema BW, Reimer JD, De Voogd NJ (2015) New records of the rare calcareous sponge Paragrantia waguensis Hôzawa, 1940. ZooKeys 546: 1-20. https://doi.org/10.3897/zookeys.546.6122