plural noun
Li·​this·​ti·​da | \-stədə\

Definition of Lithistida 

in former classifications

: an order of sponges (class Demospongiae) comprising well-preserved fossil sponges with a massive reticulate skeleton of fused siliceous spicules

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History and Etymology for Lithistida

New Latin, from (assumed) Greek lithistos (verbal of Greek lithizein to resemble a stone, from lith- + -izein -ize) + New Latin -ida

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