Opisthokont orders

Cryptomycota ('hidden fungi'), Rozellida, or Rozellomycota are a clade of micro-organisms that are either fungi or a sister group to fungi. They differ from classical fungi in that they lack chitinous cell walls at any trophic stage in their lifecycle, as reported by Jones and colleagues in 2011. Despite their unconventional phagocytic feeding habits (typical fungi are osmotrophic), chitin has been observed in the inner layer of resting spores, and in immature resting spores for some species of Rozella, as indicated with calcofluor-white stain as well as the presence of a fungal-specific chiti

REDIRECT Nucleariid

Dermocystida is an order of parasitic eukaryotes.

Eccrinida is an order of parasitic eukaryotes, especialized in parasiting animals.

Acanthoecida is an order of Choanoflagellates belonging to the class Choanoflagellatea. It is a type of heterotrophic nanoflagellate that feeds on suspended particles.

Craspedida is an order of choanoflagellate, with members with an exclusively organic covering. Crown group craspedids (and perhaps crown group choanoflagellates if Acanthoecida arose within Craspedida) appeared 422.78 million years ago. Although a previous study from 2017 recovered the divergence of the crown group choanoflagellates (craspedids) at 786.62 million years.

Eccrinales are an order of eukaryotes, previously thought to be zygomycete fungi belonging to the class Trichomycetes, but now considered to be members of the opisthokont group Mesomycetozoea.