Coniothyriaceae is a family of ascomycetous marine-based fungi within the order of Pleosporales in the subclass Pleosporomycetidae and within the class Dothideomycetes.

[6] According to Outline of Fungi and fungus-like taxa – 2021;[3] The family was introduced in 1983 to accommodate genus Coniothyrium spp.

[8][9][10] Coniothyriaceae was then reinstated in order Pleosporales as de Gruyter et al. (2013) revealed the distinct phylogenetic relationship between Coniothyrium palmarum and family Leptosphaeriaceae.

This was based on LSU and ITS sequence data and revealed that Coniothyrium palmarum was phylogenetically distant from family Leptosphaeriaceae.

[13] Cortinas et al. (2004) showed that Coniothyrium zuluense was accommodated in family Mycosphaerellaceae.

[17] Both genus Coniothyrium and coniothyrium-like species were identified as polyphyletic within the Pleosporales order.

Genera and species within the Coniothyriaceae family have; an asexual morph which is characterized in having cucurbitaria-like, black and globose shaped ascomata (fruiting body).

[23] The asci is 8-spored, cylindrical, bitunicate (double walled) and muriform (divided in regular chambers).

[22] For example of widespread distribution; species Coniothyrium ferrarisianum has been isolated from leaves of Daphne mucronata Royle in Iran,[25] it was originally isolated from Acer pseudoplatanus L. in Italy in 1958,[26] and it was later found on Vitis vinifera L. in Canada in 2017,[27] as well as Prunus spp.