''Fasciculus vesanus'' is an
extinct
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...
species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...
of
stem-group ctenophores
Ctenophora (; ctenophore ; ) comprise a phylum of marine invertebrates, commonly known as comb jellies, that inhabit sea waters worldwide. They are notable for the groups of cilia they use for swimming (commonly referred to as "combs"), a ...
known from the
Burgess Shale of
British Columbia
British Columbia (commonly abbreviated as BC) is the westernmost province of Canada, situated between the Pacific Ocean and the Rocky Mountains. It has a diverse geography, with rugged landscapes that include rocky coastlines, sandy beaches, ...
, Canada. It is dated to and belongs to middle
Cambrian
The Cambrian Period ( ; sometimes symbolized C with bar, Ꞓ) was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon. The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran Period 538.8 million ...
strata.
The species is remarkable for its two sets of long and short comb rows, not seen in similar form elsewhere in the
fossil
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...
record or among modern species.
See also
*''
Ctenorhabdotus capulus''
*''
Xanioascus canadensis''
Maotianshan shales ctenophores
**''
Maotianoascus octonarius''
**''
Sinoascus paillatus''
**''
Stromatoveris psygmoglena''
References
External links
*
Prehistoric ctenophore genera
Burgess Shale animals
Monotypic ctenophore genera
Fossil taxa described in 1978
Cambrian genus extinctions
{{Ctenophore-stub