Fungalpedia  –Note 27 Speleostelium

Speleostelium S. Baldauf, S. Sheikh & Thulin

Index Fungorum number: IF553748; Fig. 1

Speleostelium is classified in Raperosteliaceae and comprises a single species, Speleostelium caveatum which is the type species (Sheikh et al. 2018). Speleostelium is morphologically similar to TieghemosteliumHagiwaraea and Raperostelium, but the genus is different from other genera based on small subunit rRNA gene (Sheikh et al. 2018). The sorocarps have hyaline, long, delicate stalks. The spores are ellipsoid, hyaline and granuled. The myxamoebae prey upon cells of other dictyostelids and prevent them from fruiting.

Type species: Speleostelium caveatum (Waddell et al.) S. Baldauf, S. Sheikh & Thulin

Basionym: Dictyostelium caveatum D.R. Waddell, Raper & A.W. Rahn

Fig 1. Speleostelium caveatum (type strain B4-3). a. Clustered sorocarps. b. Sorophores. c. Vegetative myxamoebae. d. Young aggregations formed without inflowing streams. e. Spores. Redrawn from Sheikh et al. (2018).


Sheikh S, Thulin M, Cavender JC, Escalante R et al. 2018 – A new classification of the Dictyostelids. Protist 169, 1–28. 1017300925

Entry by

Phongeun Sysouphanthong, Center of Excellence in Fungal Research, Mae Fah Luang University, Thailand.

(Edited by Chitrabhanu S. Bhunjun and Kevin D. Hyde)

Published online 18 May 2023