Horný R.J. (2006). The Middle Ordovician tergomyan mollusc Pygmaeoconus: an obligatory epibiont on hyolithids. Sborník Národniho Muzea, ser. B, Prirodni Vedy [= Acta Musei Nationalis Pragae, Series B, Natural History]. 62 (1–2): 81–95.
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Horný R.J.
2006
The Middle Ordovician tergomyan mollusc Pygmaeoconus: an obligatory epibiont on hyolithids
Sborník Národniho Muzea, ser. B, Prirodni Vedy [= Acta Musei Nationalis Pragae, Series B, Natural History]