Original Article

Mycological Progress

, Volume 12, Issue 4, pp 755-761

First online:

Ophiocordyceps sessilis sp. nov., a new species of Ophiocordyceps on Camponotus ants in Japan

  • Yoshitaka KaitsuAffiliated with
  • , Kiminori ShimizuAffiliated withMedical Mycology Research Center, Chiba University Email author 
  • , Eiji TanakaAffiliated withIshikawa Prefectural University
  • , Satoshi ShimanoAffiliated withEnvironmental Education Center, Miyagi University of Education
  • , Shigeru UchiyamaAffiliated withRIKEN Research Cluster for Innovation Nakamura Laboratory
  • , Chihiro TanakaAffiliated withLaboratory of Environmental Mycoscience, Graduate School of Agriculture, Kyoto University
  • , Noriko KinjoAffiliated withCollege of Liberal Arts and Sciences, Tokyo Medical and Dental University

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Ophiocordyceps sessilis, a new species of Ophiocordycipitaceae, Hypocreales, was found on Camponotus obscuripes ants, where the ants were primarily infected by another close relative, O. pulvinata. Morphological observation clearly indicated that O. sessilis and O. pulvinata are distinct species. Ophiocordyceps sessilis exhibited superficial development of perithecia and ascospore disarticulation into part-spores, not known in O. pulvinata. Nucleotide sequence data suggested that O. sessilis belongs in Ophiocordyceps, Ophiocordycipitaceae. Molecular data also indicated that O. sessilis is a close relative of O. cuboidea, O. prolifica, O. paracuboidea, and O. ryogamiensis, which are all known to produce part-spores. Since O. sessilis is always associated with ants infected by O. pulvinata, O. sessilis may be a hyperparasite of O. pulvinata.


Camponotus ant Hyperparasite Hypocreales Ophiocordycipitaceae Taxonomy