Bivalvia | Cardiida | Cardioidea | Cardiidae | Didacna
Eichwald, 1829. Zool. Spec. Rossiae 1: 283, pl. 5, fig. 9 [as ‘Cardium protractum’].
Eichwald, 1841. Nouv. Mém. Soc. Imp. Nat. Moscou 7: 280, pl. 40, figs. 10-11.
Didacna protracta — Zhadin (1965), Vinarski & Kantor (2016), Wesselingh et al. (2019)
Didacna protracta protracta — Kantor et al. (2010)
Andrusov, 1910. unknown publication: ??.
Didacna protracta submedia — Kantor et al. (2010)
Didacna protracta — Vinarski & Kantor (2016)
Andrusov, 1910. unknown publication: ??.
(intro'd as intra-sp. of Adacna protracta Eichwald, 1841)
Didacna protracta submedia — Kantor et al. (2010)
Didacna protracta — Vinarski & Kantor (2016)
‘Eichw.’ Grimm, 1877. Kaspinskoe Fauna (2): 58, pl. 8, figs. 7-9.
(misidentified reference to Monodacna catillus Eichwald, 1841)
Didacna protracta — Vinarski & Kantor (2016), Wesselingh et al. (2019)
Andrusov, 1910. unknown publication: ??.
(intro'd as intra-sp. of Adacna protracta Eichwald, 1841)
Didacna protracta — Vinarski & Kantor (2016)
Didacna protracta — Zhadin (1965), Vinarski & Kantor (2016), Wesselingh et al. (2019)
Didacna protracta protracta — Kantor et al. (2010)
Didacna protracta submedia — Kantor et al. (2010)