Metaspriggina is hinted at even having well ... together the stages leading to the assembly of the higher vertebrate body plan. The biggest mystery we are trying to resolve is exactly how and ...

One of the earliest outlines of jaws may have been written in the gills of a fish called Metaspriggina walcotti ... that ran vertically down the body and supported the gills.

The fish, known as Metaspriggina, shows pairs of exceptionally well-preserved arches near the front of its body. The first of these pairs, closest to the head, eventually led to the evolution of ...

The fish is called Metaspriggina. Researchers say it grew about 2 inches long and lived widely in North America some 515 million to 500 million years ago. The fish had no jaws. But Jean-Bernard ...

The discovery of 505-million-year old fossilised Metaspriggina helps explain the ... pairs of well-preserved arches near the front of its body. The first of these pairs, closest to the head ...

Figure 1: Metaspriggina walcotti (Simonetta and Insom, 1993) specimens from Marble Canyon and Walcott’s Quarry collected by the Royal Ontario Museum.

Metaspriggina is hinted at even having well formed front ... fossils is to piece together the stages leading to the assembly of the higher vertebrate body plan. The biggest mystery we are trying to ...