Taxa described in 1939

Troidini is a tribe of swallowtail butterflies that consists of some 135 species in 12 genera. Members of this tribe are superlatively large among butterflies (in terms of both wingspan and surface area) and are often strikingly coloured.

Xerosicyos is a flowering plant genus of the family Cucurbitaceae. Its name comes from Greek xeros (meaning "dry") and sicyos ("cucumber"). There are six species, all endemic to Madagascar.

Mimosybra is a genus of beetles in the family Cerambycidae, containing the following species:

Limbodessus is a genus of beetles in the family Dytiscidae, first described by Félix Guignot in 1939. It contains the following species:

Iskandera is a genus of flowering plants belonging to the family Brassicaceae. It includes a single species, Iskandera hissarica, which is native to Tajikistan and Uzbekistan.

thumb|Distribution of the Trachyaretaon species according to Frank H. Hennemann|Hennemann 2023 thumb|Trachyaretaon carmelae, pair thumb|Trachyaretaon echinatus, female from 'North-[[Luzon']] thumb|upright|Pair of Trachyaretaon negrosanon from [[Negros Island]] Trachyaretaon is a genus of stick insects native to the Philippines.

Isotomiella is a genus of springtails (Collembola) in the family Isotomidae.

Naevolus is a genus of skipper butterflies in the family Hesperiidae.

Pedinoida is an order of sea urchins, containing the family Pedinidae with a single living genus, Caenopedina. The group was much more diverse during the Mesozoic, and represents the oldest surviving order of euechinoid sea urchins.

Truncocolumella is a genus of fungi in the family Suillaceae, of the order Boletales. It was circumscribed by American mycologist Sanford Myron Zeller in 1939.

genus of insects

Gelopellis is a genus of fungi in the family Claustulaceae. The species in this relatively rare genus have fruit bodies that resemble the unopened egg of the stinkhorn Mutinus, with the columnella (sterile tissue extending up into or through the gleba) occupying the place where the compressed receptacle would be in the latter genus. The genus contains six species found in South America, Japan, and Australia.

Acanthosybra is a genus of beetles in the family Cerambycidae, containing a single species, Acanthosybra lineolata. It was described by Stephan von Breuning in 1939.

Costachorema is a genus of caddisflies belonging to the family of Hydrobiosidae. The genus was first recognised by Alex G. McFarlane in 1939.