Leucosolenida is an order of spongess in the class Calcarea and the subclass Calcaronea. Species in 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