†subfamily Sigmagraptinae Cooper and Fortey 1982 (graptolite)
Pterobranchia - Graptoloidea - Sinograptidae
Parent taxon: Sinograptidae according to B. A. Vento et al. 2012
See also Toro 1993 and Toro 1997
Sister taxa: Allograptus, Holmograptus, Pseudodichograptus, Sinograptus, Tylograptus
Subtaxa: Acrograptus Trichograptus
Ecology: passively mobile planktonic suspension feeder
Distribution:
• Arenig of Argentina (2 collections), Canada (1: Yukon), the United Kingdom (1)
• Ordovician of Argentina (4), Australia (1), the Russian Federation (9), Spain (2), the United Kingdom (1), United States (1: Idaho)
Total: 22 collections including 27 occurrences