Helcionella
Encyclopedia
Helcionella is the archetypical genus of helcionellid
. Its shells are around about a centimetre in size; they are strongly endogastric, with the tip of the shell extending beyond the rear extremity of the shell's aperture.
Helcionellid
The Helcionellids are fossil shells of very small marine mollusks that are preserved as shells. These animals are first found about in the late Nemakit-Daldynian age, which is the earliest part of the Cambrian period. A single species persisted to the Early Ordovician...
. Its shells are around about a centimetre in size; they are strongly endogastric, with the tip of the shell extending beyond the rear extremity of the shell's aperture.