Diagnoza

The M elements with smoothly convex postero-internal surface of the cusp .

Porównanie

There are only four discrete element types in its apparatus. P. rectus differs from its closest relative P. graeai in the lack of postero-internal ridge in the M element and sinuous profile of bases of all elements and from P. gradatus in the lack of posterior furrow in the Me element and additional furrows in other element types.

Autekologia

Występowanie geograficzne

Very common in the Ordovician of the Baltic area and the Holy Cross Mountains
where it occurs in the Bukówka Sandstone and in the Mójcza Limestone

Zasięg czasowy

Ordovician from its base up to 0.7 m
above the bentonite (top of P. anserinus Zone). Occasionally it cooccurs sympatrically with two other
species of the genus.

Materiały muzealne

Literatura

Dzik, J. 1994. Conodonts of the Mójcza Limestone. In: J. Dzik, E. Olempska, & A. Pisera. Ordovician carbonate platform of the Holy Cross Mountains. Palaeontologia Polonica 53, 43-128. 

Mellgren, J.S. & Eriksson, M.E. 2006. A model of reconstruction for the oral apparatus of the Ordovician conodont genus Protopanderodus Lindström, 1971. Earth and Environmental Science Transactions of the Royal Society of Edinburgh 97, , 97–112.