Orbopyxidiella matthesi (Guhl, 1972) Guhl, 1979

Chatterjee, Tapas, 2025, A checklist of peritrich ciliate epibionts (Ciliophora, Peritrichea) on aquatic oligochaetes (Annelida, Oligochaeta), Zootaxa 5725 (1), pp. 106-118 : 108-109

Orbopyxidiella matthesi (Guhl, 1972) Guhl, 1979

= Pyxidiella matthesi Guhl, 1972

Report as epibiont on oligochaetes: This species was reported as epibiont on the oligochaete species Lumbriculus variegatus and Stylaria lacustris from Germany ( Guhl 1972a; Schödel 2018)

Remarks: Guhl (1979) also reported this species on the scavenger beetle Enochrus coarctatus .

Guhl(1972a) published originally this species as Pyxidiella matthesi and transferred into the Orbopyxidiella genus in 1979. Schödel (2018, p. 80) mentions the synonym for this species as ‘ Ampullaster matthesi : Jankowski 1985’. The name combination Ampullaster matthesi does not exist. The genus Ampullaster Jankowski, 1976 , was proposed for the single species Pyxidium stammeri Lust, 1950 , but also in abstracts ( Jankowski 1976) and full text is unavailable (personal communication from Dr. Igor Dovgal). In addition, this is a homonym, because the generic name Ampullaster Fell, 1963 is present in Echinodermata.

Orbopercularia matthesi Lust, 1950 belongs to other genus and is not the same species as Orbopyxidiella matthesi (Guhl, 1972) Guhl, 1979 . Here we also need to mention Orbopercularia matthesi Lust, 1950 , which was marked as a type species of the genus Thysanotheca by Jankowski (1976) in an abstract of a conference, hence the generic name is unapplicable. Jankowski (2007) redescribed the genus Thysanotheca , but without marking ’gen. n.’, hence the name is unapplicable too (personal communication from Dr. Igor Dovgal).