On the spicule formation of Spongilla
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
Similarly, experimental studies with Spongilla
lacustris and Suberites domuncula demonstrated that an increase in environmental silica is related to an increase in spicule width but not in length (Jones, 1979; Simpson et al.
First Records of the Freshwater Sponges Corvoheteromeyenia Heterosclera and Spongilla
Alba (Porifera: Spongillidae) from Curacao, with Species Descriptions and Data from Transplantation Experiments.
Dawson (1966) identified species associated with a fish hatchery in the northern Nebraska sandhills as Meyenia mulleri, Spongilla
fragilis, and Carterius tubispermis.
In the geographical context, for example, it is seen that the colonization operated by Spongilla
spoliata, Drulia conifera, Oncosclera intermedia and O.
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.
Oligochaeta inhabiting the colonies of the sponge Spongilla
An ultrastructural study of silica deposition in the freshwater sponge Spongilla