Biarmeaspira Mazaev, 2006

Ketwetsuriya, Chatchalerm, Karapunar, Baran, Charoentitirat, Thasinee & Nützel, Al- Exander, 2020, Middle Permian (Roadian) gastropods from the Khao Khad Formation, Central Thailand: Implications for palaeogeography of the Indochina Terrane, Zootaxa 4766 (1), pp. 1-47 : 13

Biarmeaspira Mazaev, 2006

Type species. Biarmeaspira verideclinata Mazaev, 2006 , Permian, Russia.

Remarks. When Mazaev (2006) erected the genus Biarmeaspira , he tentatively placed it within the family Phymatopleuridae Batten, 1956 (see also Mazaev 2015). However, the characters regarding the selenizone suggest a placement within the family Eotomariidae . The members of Eotomariidae are characterized by a concave selenizone and the lower edge of their selenizone represents the shell periphery. The early shell development of genus Biarmeaspira as documented by Mazaev (2015) shares these characteristics with other Eotomariidae . As suggested by Mazaev (2006, 2015), Biarmeaspira probably derived from the eotomariid genus Baylea . This further supports its placement in the family Eotomariidae .