Retrieve all taxa names or TSNs (taxonomic serial numbers) downstream in hierarchy from given TSN.

downstream2.r

install.packages("devtools") # need devtools to use install_github()
require(devtools)

install_github("ritis", "ropensci") # need for the function searchbyscientificname below
require(ritis)

install_github("taxize_", "ropensci", ref="downstream_fix") # Installs packages in development directly from Github
library(taxize)

tsn1 <- searchbyscientificname("Osteichthyes") # get TSN for Osteichthyes (bony fish)
downstream2(tsn1$tsn, "Class") # get all Classes within Osteichthyes