Anostostoma couloni Saussure, 1862 Sia couloni (Saussure, 1862) Sia ferox (also known as Riokku (リオック, loanword from the Indonesian name) or Obakekorogisu (オバケコロギス, "Obake raspy cricket") in Japan) is a species of cricket that lives in Indonesia.

Although its basic form is similar to other Stenopelmatoidea, it is relatively elongated.

The female has a rudimentary ovipositor, unlike true Gryllacrididae or Anostostomatidae species.

The species is a nocturnal predatory cricket that presumably preys on other small organisms found in the rainforest litter such as other arthropods including spiders, smaller crickets and grasshoppers.

[2] Like other Stenopelmatidae species, Sia ferox usually hides in its burrow during the day.