This coincides with a period in which many modern genera of birds became recognizable in the fossil record.

Several species and one of the 32 modern genera have become extinct in recent centuries.

They attest that modern genera were mostly distinct by the Pleistocene, a few million years ago.

However the extensive intergrowth of the host and parasite hyphae is distinct from those found in the modern genera.

While only five leg pairs can be discerned, the information gained from the fossil is enough to preclude assignment to any known modern genus.

But there are some fossil species that are not assignable to the modern genus.

They are surprisingly very similar to modern genera, though with a greater number of flagellar segments and longer forewing veins.

The fossil specimens already bear strong resemblance to the modern genera.

This combination of characteristics is similar to certain modern genera in the order Laminariales (kelps).

The size is estimated to be only half of the modern genus.