Koralionastetales Kohlm., Volkm.-Kohlm., J. Campb. & Inderb., Mycol. Res. 113(3): 377 (2009)
MycoBank number: MB 512605; Index Fungorum number: IF 512605; Facesoffungi number: FoF 01244;
Koralionastetales was introduced to accommodate the genera Pontogenia and Koralionastes (Campbell et al. 2009). Pontogenia was initially classified as Sordariomycetes, genera incertae sedis, while Koralionastes as Ascomycota, genera incertae sedis (Eriksson 2006). The order was established based on the monophyletic clade formed by three Koralionastes species and one Pontogeneia species in the LSU and SSU-based phylogeny (Campbell et al. 2009). Species of Koralionastetales are distinct from taxa belonging to other orders in Sordariomycetes by the formation of antheridia on their germinating ascospores (Zhang et al. 2006). Furthermore, all Koralionastetales species are restricted to marine habitats, in association with corals, sponges and algae (Campbell et al. 2009, Jones et al. 2019). The divergence time for Koralionastetales is estimated as 210.5 MYA (Fig. 2). Currently there is one family and two genera in this order (this paper).
Figure 2 – The maximum clade credibility (MCC) tree, using the same dataset from Fig. 1. This analysis was performed in BEAST v1.10.2. The crown age of Sordariomycetes was set with Normal distribution, mean = 250, SD = 30, with 97.5% of CI = 308.8 MYA, and crown age of Dothideomycetes with Normal distribution mean = 360, SD = 20, with 97.5% of CI = 399 MYA. The substitution models were selected based on jModeltest2.1.1; GTR+I+G for LSU, rpb2 and SSU, and TrN+I+G for tef1 (the model TrN is not available in BEAUti 1.10.2, thus we used TN93). Lognormal distribution of rates was used during the analyses with uncorrelated relaxed clock model. The Yule process tree prior was used to model the speciation of nodes in the topology with a randomly generated starting tree. The analyses were performed for 100 million generations, with sampling parameters every 10000 generations. The effective sample sizes were checked in Tracer v.1.6 and the acceptable values are higher than 200. The first 20% representing the burn-in phase were discarded and the remaining trees were combined in LogCombiner 1.10.2., summarized data and estimated in TreeAnnotator 1.10.2. Bars correspond to the 95% highest posterior density (HPD) intervals. The scale axis shows divergence times as millions of years ago (MYA).