Leucosolenida is an order of

sponge Sponges or sea sponges are primarily marine invertebrates of the animal phylum Porifera (; meaning 'pore bearer'), a basal clade and a sister taxon of the diploblasts. They are sessile filter feeders that are bound to the seabed, and a ...

s in the class Calcarea and the subclass

Calcaronea Calcaronea is a subclass of sea sponges Sponges or sea sponges are primarily marine invertebrates of the animal phylum Porifera (; meaning 'pore bearer'), a basal clade and a sister taxon of the diploblasts. They are sessile filter feed ...

. 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 Sponges or sea sponges are primarily marine invertebrates of the animal phylum Porifera (; meaning 'pore bearer'), a basal clade and a sister taxon of the diploblasts. They are sessile filter feeders that are bound to the seabed, and are on ...

forms (Leucosoleniidae) to fully

leuconoid Sponges or sea sponges are primarily marine invertebrates of the animal phylum Porifera (; meaning 'pore bearer'), a Basal (phylogenetics) , basal clade and a sister taxon of the Eumetazoa , diploblasts. They are sessility (motility) , sessile ...

forms. These body plans are on a continuum based on an increasingly complex skeletal system and compartmentalized

choanocytes Choanocytes (also known as "collar cells") are cells that line the interior of asconoid, syconoid and leuconoid body types of sponges that contain a central flagellum, or ''cilium,'' surrounded by a collar of microvilli which are connected by ...

. A few sources (such as the ''

Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology,'' published from 1953–2007 by the Geological Society of America and the University of Kansas, then 2009–present by the University of Kansas Paleontological Institute, is a definitive multi-authore ...

'', 2004) place non-asconoid families into a separate order, Sycettida.''Treatise on Invertebrate Paleontology'' Part E, Revised. Porifera, Volume 3: Classes Demospongea, Hexactinellida, Heteractinida & Calcarea, xxxi + 872 p., 506 fig., 1 table, 2004, availabl
here
. 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 Grantiidae is a family (biology), family of calcareous sponges in the order Leucosolenida. References Taxonomicon
Leucosolenida Sponge families {{calcarea-stub ...

Dendy, 1892 * Heteropiidae Dendy, 1892 * Jenkinidae Borojevic et al., 2000 * Lelapiidae? Dendy & Row, 1913 * Leucosoleniidae Minchin, 1900 * Sycanthidae Lendenfeld, 1891 *

Sycettidae Sycettidae is a family of calcareous sponges in the order Leucosolenida. References *http://www.marinespecies.org/aphia.php?p=taxdetails&id=131617 accessed 11 November 2010''Sycettidae''at Encyclopedia of Life The Encyclopedia of Life (EOL ...

Dendy, 1892 (sometimes known as Syconidae)

References

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