Lithistida
plural noun
Li·this·ti·da
-stədə
in former classifications
: an order of sponges (class Demospongiae) comprising well-preserved fossil sponges with a massive reticulate skeleton of fused siliceous spicules
Word History
Etymology
New Latin, from (assumed) Greek lithistos (verbal of Greek lithizein to resemble a stone, from lith- + -izein -ize) + New Latin -ida