Nadinella tenella, pseudostome



Nadinella tenella Penard, 1900


I found this single specimen in the river Saar near Saarburg, Germany, in sediment on submerged stones along its shore. It differs from the shell found in the Netherlands in having a narrower pseudostome, where the Dutch species has a broad oval one.


Pseudostome and collar, with two filopodia
Nadinella tenella, with arrowed collar and pseudostome with 5 filopodia
Plasm visible; it doesn't fill the shell completely