Triasacarus

{{Short description|Extinct genus of spiders}}

{{Italic title}}

{{speciesbox

|genus=Triasacarus

|species = fedelei

|fossil_range = Late Triassic {{Fossil range|Carnian}}

|authority = Schmidt et al., 2012

}}

Triasacarus fedelei is an extinct species of gall mite described from the Carnian of northeastern Italy. It lived as a parasite of Cheirolepidiaceae trees. The only known specimen, preserved in amber, is 0.210 mm long.{{Cite journal | last1 = Schmidt | first1 = A. R. | last2 = Jancke | first2 = S. | last3 = Lindquist | first3 = E. E. | last4 = Ragazzi | first4 = E. | last5 = Roghi | first5 = G. | last6 = Nascimbene | first6 = P. C. | last7 = Schmidt | first7 = K. | last8 = Wappler | first8 = T. | last9 = Grimaldi | first9 = D. A. | doi = 10.1073/pnas.1208464109 | title = Arthropods in amber from the Triassic Period | journal = Proceedings of the National Academy of Sciences | volume = 109 | issue = 37 | pages = 14796–15501 | year = 2012 | pmid = 22927387| pmc = 3443139| doi-access = free }} Along with Ampezzoa triassica and an unnamed dipteran, it is the oldest arthropod found enclosed in amber.{{cite web|title=Oldest Occurrence of Arthropods Preserved in Amber: Fly, Mite Specimens Are 100 Million Years Older Than Previous Amber Inclusions|url=https://www.sciencedaily.com/releases/2012/08/120827180021.htm|publisher=ScienceDaily|accessdate=22 May 2013}}

It is possible that Triasacarus induced the formation of galls on the host plant.