Dystactella biarmica (de Verneuil, 1845) Bailey, 2021

Bailey, Jack Bowman, 2021, The genera that never were: The impact of Janeia and Janacekia on phyletic and taxonomic relations within the Solemyidae (Bivalvia: Protobranchia), Palaeontologia Electronica (a 12) 24 (1), pp. 1-47 : 32

Dystactella biarmica (de Verneuil, 1845) n. comb.

Remarks. Holotype of de Verneuil (1845) is an internal mold with profile and ligament (external,

parivincular) similar to Dystactella subnasuta (Hall and Whitfield) . Shell exterior and prosopon not preserved in the holotype. Judged by Meek (1871, p.

67) to be possible synonym of S olemya (Janeia)

vetusta Meek (= Dystactella ; see below). Solemya saginata of de Ryckholt 1854 is a possible synonym.

1845 Solemya biarmica de Verneuil , p. 294, pl. 19, fig. 4a-b [IG, Le]; Lower Permian, Nizhny Novgorod Oblast, Russia.

? 1848 Solemya biarmica de Verneuil ; Geinitz, p. 8, pl. 3, fig. 34. [Tiny oval shell with low umbos; gen. et sp. indet.] Upper Permian, Kupferschiefer, Kamsdorf, Germany.

non 1850 Janeia biarmica (de Verneuil) ; King, p. 178, pl. 16, fig. 7 [= probable pholadomyid, i.e., Wilkingia elegans (King) ; see Logan, 1967, p. 63]; Upper Permian, Humbledon Hill, Durham, England.

? 1854 Solemya saginata de Ryckholt , p. 53, pl. 11, figs. 9, 10 [Pc, Pr0; = Dystactella cf. subnasuta ; compares with Pojeta (1988, pl. 8 figs.

1, 2)]; Lower Carboniferous, (Tournaisian), l’argile carbonifère, Tournai, Belgium.

non 1858 Solemya biarmica? de Verneuil ; Howse (?Howse), p. 266, pl. 11, figs. 8, 9 [formerly, Solenimya abnormis Howse, 1848 , and Solemya abnormis Howse, 1857a ] [= Stutchburia ? cf. modioliformis (King) sensu Logan (1967, p. 51) ]; Upper Permian, Silksworth, Durham, England.

? 1860 Solenomya biarmica? de Verneuil ; Swallow and Hawn (?Swallow and Hawn), p. 190. [Material described as “imperfect”; no description, no figure; Swallow was doubtful about generic placement]; Upper Permian , Council Grove, Kansas .

p? 1861 Solemya biarmica de Verneuil ; Geinitz, p. 60, pl. 12, fig. 18 [Pc; shell form fairly consistent with D. biarmica ; ligament unknown]; Upper Permian, Zaufensgraben bei Gera, Germany; non pl. 12, fig. 19 [= type of Solemya phllipisiana sensu Schauroth ]; Upper Permian (lower Zechstein), Bucha, Germany.

non 1866 Solemya biarmica de Verneuil ; Geinitz, p. 15, pl. 1 fig. 22; [gives size but no description; hinge, ligamental and interior uknown; the smoothly ovoid profile, pointed subcentral umbo, and fasciculate comarginal growth laminae are unlike known solemyids; gen. et sp. indet.] Pennsylvanian, Plattsmouth Limestone Member, Oread Limestone, Nebraska City, Nebraska.

1877 Solenomya biarmica de Verneuil ; Miller, p. 204 [no figure].

1889 Solenomya biarmica de Verneuil ; Miller, p. 512 [no figure].

non 1894 Solemya biarmica de Verneuil ; Netschajew, p. 302, pl. 10, fig. 13 [gen. et. sp. indet.; probably not a solemyid]; Permian, Volga River at the mouth of the Kama.

1896 Solemya biarmica de Verneuil ; Hind, p. 24, 36 [no figure].

non 1897 Solemya (Janeia) biarmica (de Verneuil) ; Diener, p. 173, pl. 8, figs. 7, 8 [= Sanguinolites ? M’Coy, 1844]; Upper Permian, Kuling Shales, south of Pomerang, India.

? 1967 Janeia biarmica (de Verneuil) ; Logan, p. 60, pl. 10, fig. 11?, fig. 12? [possible Dystactella , sp. indet.; Pc, Ne, IG]; Upper Permian, Middle Magnesian Limestone, Tunstall Hill, Durham, England.

? 1978 Janeia biarmica (de Verneuil) ; Kłapciński and Karwowski, p. 72, pl. 2, figs. 12, 13; [poor preservation; gen. et sp. indet.]; Upper Permian (middle Zechstein), Main Dolomite, Stassfurt Cyclothem, Poland.

non 1984 Solemya (Janeia) biarmica (de Verneuil) ; Muromtseva and Guskov, p. 34, pl. 24, fig. 4a-b [= cf. Acharax sp. ; Pr0, Ne, Bts?, IG]; non fig. 5 [gen. et sp. indet]; fig. 6a-b [= clinopisthin, cf. Clinopistha sp. ; Pc, Ne, IG]; fig. 7 [= Dystactella ?]; Lower Permian (Kungurian), Pechora Basin, Russia.