Diagnoza

The sp elements with a short but still bifurcating anterior process and with the posterior process long and oriented almost parallel to the inner one , external margins of these processes strongly flaring. The oz elements with the main processes in the same vertical plane , forming an almost
right angle, the base of the external process with a sinuous profile.

Porównanie

Except for the sample MA-46, I am not able to find any strictly symmetrical elements in the symmetry transition series. It thus cannot be excluded that the tr location was occupied by a slightly asymmetrical element. Early populations of the species are, to some degree, similar to Lenodus but can be easily distinguished by the reduced anterior process of the oz elements (like in Baltoniodus)
and prominently denticulated ne elements.

Autekologia

Występowanie geograficzne

Zasięg czasowy

The transition between Lenodus and Sagittodontina cannot be traced in Mójcza and it seems that the introduction of the latter lineage, represented by some primitive populations 0.7m below and up to the discontinuity (samples MA-125 and MA-41), was migrational rather than
evolutionary. The species gradually disappears in Mójcza, being represented up to 0.5 m above the bentonite (B. variabili s Subzone), later possibly replaced by an early Amorphognathus. Again, this is not an evolutionarily meaningful process. Rare specimens of the species occur at some levels in the
Llanvirn of the Baltic area and south China. In Wales it is known from the early Caradoc.

Materiały muzealne

Literatura

Dzik, J. 1994a 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.