Editing Hexactinellid (section)

==Evolution and taxonomy==
The earliest known hexactinellids are from the earliest [[Cambrian]] or late [[Neoproterozoic]] eras; ''[[Helicolocellus]]'' is a possible hexactinellid relative from the late [[Ediacaran]].<ref name="Wang2024">{{cite journal |doi=10.1038/s41586-024-07520-y |title=A late-Ediacaran crown-group sponge animal |date=2024 |last1=Wang |first1=Xiaopeng |last2=Liu |first2=Alexander G. |last3=Chen |first3=Zhe |last4=Wu |first4=Chengxi |last5=Liu |first5=Yarong |last6=Wan |first6=Bin |last7=Pang |first7=Ke |last8=Zhou |first8=Chuanming |last9=Yuan |first9=Xunlai |last10=Xiao |first10=Shuhai |journal=Nature |volume=630 |issue=8018 |pages=905–911 |pmid=38839967 |bibcode=2024Natur.630..905W }}</ref> They are fairly common relative to [[demosponges]] as fossils, but this is thought to be, at least in part, because their spicules are sturdier than [[spongin]] and fossilize better. Like almost all sponges, the hexactinellids draw water in through a series of small pores by the whip-like beating of a series of hairs or [[Flagellum|flagella]] in chambers which in this group line the sponge wall.

The class is divided into two subclasses and several orders:<ref>{{cite WoRMS|title=Hexactinellida|22612|url=https://www.marinespecies.org/aphia.php?p=taxdetails&id=22612}}</ref>

Class '''Hexactinellida'''
*Subclass [[Amphidiscophora]]
**Order [[Amphidiscosida]]
**Order †[[Hemidiscosa]]<ref name=":0">''Treatise on Invertebrate Paleontology'' Part E, Revised. Porifera, Volume 3:  Classes Demospongea, Hexactinellida, Heteractinida & Calcarea, xxxi + 872 p., 506 fig., 1 table, 2004, available [https://journals.ku.edu/InvertebratePaleo/issue/view/455 here].  {{ISBN|0-8137-3131-3}}.</ref>
**Order †[[Reticulosa]]<ref name=":0" />
*Subclass [[Hexasterophora]]
**''[[Incertae sedis]]''
***[[Dactylocalycidae]] <small>Gray, 1867</small>
**Order [[Lychniscosida]]
**Order [[Lyssacinosida]]
**Order [[Sceptrulophora]]