Longinebela tubulosa (Penard, 1890) Kosakyan et al., 2016

Diagnosis: Shell elongated pyriform in broad lateral view, laterally compressed, with the lateral margins tapering toward the pseudostome, creating a somehow distinct neck. Small lateral pores usually present but hard to observe. In profile narrow elliptical with a pointed posterior part. Shell yellowish brown, composed of scales taken from predated organisms (euglyphids or rarely Quadrulella). Pseudostome oval in frontal view, surrounded by a thin organic collar.

Dimensions: Shell L: 190–264 µm, B: 80–155 µm. Pseudostome 35–54 µm wide.

Ecology: Wet Sphagnum vegetation

Remarks: Cash (1909) described the presence of ‘fine punctulations’ around the neck of some specimens, which he considered was organic cement producing a rough surface, and the only other feature that appeared to vary was the mixture of shell plates. I have seen specimens with shells with a substantial part of organic cement (see the pictures below).