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Pronunciation varies by accent · noun
Any of the many sponges of class Hexactinellida, which have hexactine spicules; a glass sponge..
2007, S. P. Leys, et al., The Biology of Glass Spomges, David W. Sims (series editor), Advances in Marine Biology, Volume 52, page 78, Spicules of hexactinellids are nearly indistinguishable from those of demosponges in most measured characteristics.
But Aka is also found in skeletons of hexactinellids and lithistids in Jurassic sponge mounds.
The skeleton of a hexactinellid is composed entirely of silica in the form of six-pointed siliceous spicules.[…]Hexactinellids are completely sessile; even the larvae seem to display no movement outside of their ability to disperse small distances with currents.
Use hexactinellid when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Hexactinellid means Any of the many sponges of class Hexactinellida, which have hexactine spicules; a glass sponge..
Common synonyms include glass sponge, hexactinellid sponge.
The opposite depends on the specific sense.
2007, S. P. Leys, et al., The Biology of Glass Spomges, David W. Sims (series editor), Advances in Marine Biology, Volume 52, page 78, Spicules of hexactinellids are nearly indistinguishable from those of demosponges in most measured characteristics.
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