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n.1.(Zool.) A genus of siliceous sponges found in fresh water.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Kunigelis and Copeland (2014) reported finding Ephydatia jluviatilis (L., 1759), Eunapius fragilis, Racekiela ryderi, Radiospongilla cerebellata (Bowerbank, 1863), Spongilla lacustris, and TrochospongilUi horrida (Weltner, 1893) from eastern Tennessee.
RESULTS--Specimens from the Llano River and Devils River were identified as Spongilla cenota (Penney and Racek, 1968) (Class Demospongiae) on the basis of the following distinguishing characteristics of spicules: megascleres (400-480 pm) consisted of large and smooth oxeas without noticeable projecting spines; microscleres (85-95 pm) consisted of long and slender oxeas that terminated in pointed tips with projecting spines concentrated in the center; and gemmoscleres were short (65-70 [micro]m), stout, and spiny (Fig.
Nine larvae were collected together with their substrate (freshwater sponge colonies of Spongilla sp.; Haplosclerida: Spongillidae) and maintained with a small piece of the sponge colony in water in a plastic cup covered with a fine-mesh tissue.
Dawson (1966) identified species associated with a fish hatchery in the northern Nebraska sandhills as Meyenia mulleri, Spongilla fragilis, and Carterius tubispermis.
The freshwater demosponge Spongilla lacustris has a similar feature made of a glycocalyx mesh that lies between the tips of adjacent collars and is thought to function like a strainer, forcing water through the collar microvilli (Weissenfels, 1992).
However, recent collections of the freckled madtom, an Iowa darter (Etheostoma exile) in Salt Creek (Gutmann, 2005), and a freshwater sponge (possibly Spongilla aspinosa) in the Chicago River (Murphy, 2005) are encouraging news for the region.
Two freshwater sponge species, Eunapius fragilis and Spongilla aspinosa, were also found.
A second round of spicule analysis determined that sponges from Shadow Brook and the Susquehanna River in 2016 were a unique species, Spongilla lacustris (Linnaeus), and all other colonies identified in this study were the same species, Eunapius fragilis (Fig.