Leucosolenida
Leucosolenida is an order of sponges in the class Calcarea and the subclass Calcaronea. Species in the order Leucosolenida are calcareous, with a skeleton composed exclusively of free spicules without calcified non-spicular reinforcements. According to Systema Porifera (2002), Lucosolenida contains 9 families, ranging from fully asconoid forms (Leucosoleniidae) to fully leuconoid forms. These body plans are on a continuum based on an increasingly complex skeletal system and compartmentalized choanocytes. A few sources (such as the Treatise on Invertebrate Paleontology, 2004) place non-asconoid families into a separate order, Sycettida. Leucosolenids have a poor fossil record, with only a few ambiguous grantiid fossils reported from the Jurassic and Carboniferous. Families 

 Achramorphidae Borojevic et al., 2002 (formerly known as Staurorrhaphidae)
 Amphoriscidae Dendy, 1892
 Grantiidae Dendy, 1892
 Heteropiidae Dendy, 1892
 Jenkinidae Borojevic et al., 2000
 Lelapiidae? Dendy & Row, 1913
 Leucosoleniidae Minchin, 1900
 Sycanthidae Lendenfeld, 1891
 Sycettidae Dendy, 1892 (sometimes known as Syconidae)

References 

http://species-identification.org/species.php?species_group=sponges&selected=beschrijving&menuentry=groepen&record=Leucosolenida