Eudontomyzon vladykovi Oliva et Zanandrea, 1959

Iftime, Alexandru & Oţel, Vasile, 2025, An annotated systematical checklist of the Romanian ichthyofauna, Zootaxa 5654 (1), pp. 1-64 : 5-6

Eudontomyzon vladykovi Oliva et Zanandrea, 1959

A native, non-predatory species, found in mountain/hill rivers in the Banat area—the TimiȘ and Bega catchments ( Bănărescu 1969; Bănăduc et al. 2013; Bănăduc et al. 2018; Cocan & MireȘan 2018; Nagy et al. 2023), in the Olt drainge in Transsylvania ( Bănărescu 1969 [as E. vladykovi ]; Nagy et al. 2023 [as E. mariae ]), as well as in rivers in extra-Carpathian areas ( Bănărescu 1969; Apetroaie 1975a; Apetroaie 1975b; Bănărescu 2005 —as E. mariae ); occasionally found in the Danube down to the Delta (Oțel 2007; Năstase & Năvodaru 2023 —as E. mariae ).

The non-predatory eastern European Eudontomyzon were reclasified following molecular analyses ( Li 2014; Levin et al. 2016; Pereira et al. 2021); while no Romanian samples were actually analyzed, the distribution of the described populations is such as to make likeliest that most (extra-Carpathian, Olt) Romanian “ E. mariae ” belong to typical E. vladykovi . The Romanian Banat E. vladykovi shows greater morphological similarity to E. danfordi than to Romanian “ E. mariae ” ( Bănărescu 1969, figs. 19 vs. 17 and 22, derived from original Romanian material), which (if this would reflect their genetic closeness) would suggest the molecular-defined danfordi -like Drava “ E. vladykovi ” population ( Pereira et al. 2021).

Other authors make a case for lumping most or all East European non-predatory Eudontomyzon into a single species, of which E. danfordi is the parasitic “pair species”/form; however, reproductive (in)compatibility was not tested in this case ( Popov & Makhrov 2015, Li 2014); at least the Drava “ E. vladykovi ”, given its extreme closeness to E. danfordi ( Levin et al. 2016; Bartels et al. 2017; Pereira et al. 2021), may likely prove to be a non-predatory form of E. danfordi .

CHONDRICHTHYES

ORD. CARCHARHINIFORMES

Fam. Scyliorhinidae

Scyliorhinus canicula (Linnaeus, 1758)

A marine species, native to the Black Sea , but only rarely found in Romanian waters, south of the Danube Delta (Oțel 2007; Radu et al. 2008).

Fam. Sphyrnidae

Sphyrna zygaena (Linnaeus, 1758)

A vagrant marine species recorded once in the Romanian Black Sea ( Bănărescu 1969, ap. Antipa, 1940, probably unpubl.) was subsequently accepted by most authors ( Vasil’eva 2007; Oțel 2007; Radu et al. 2008; Parin et al. 2014; Yankova et al. 2014; Aleksandrov et al. 2017).

ORD. SQUALIFORMES

Fam. Squalidae

Squalus acanthias Linnaeus, 1758

A native marine species, found along all Romanian Black Sea waters ( Bănărescu 1969; Oțel 2007; Vasil’eva 2007; Yankova et al. 2014; Țoțoiu et al. 2018; Cocan & MireȘan 2018; Maximov et al. 2019; Niță et al. 2022).

ORD. RAJIFORMES

Fam. Rajidae

Raja clavata Linnaeus, 1758

A native marine species, found along all Romanian Black Sea waters ( Bănărescu 1969; Oțel 2007; Vasil’eva 2007; Maximov & Zaharia 2010; Yankova et al. 2014; Cocan & MireȘan 2018; Niță et al. 2022). It has undergone decline/ range restriction (Oțel 2007).

ORD. MYLIOBATIFORMES

Fam. Dasyatidae

Dasyatis pastinaca (Linnaeus, 1758)

A native marine species, found along all Romanian Black Sea waters ( Bănărescu 1969; Oțel 2007; Vasil’eva 2007; Radu et al. 2008; Maximov & Zaharia 2010; Yankova et al. 2014; Cocan & MireȘan 2018; Niță et al. 2022). Has undergone decline/range restriction (Oțel 2007).

OSTEICHTHYES

ORD. ACIPENSERIFORMES

Fam. Acipenseridae

Acipenser gueldenstaedtii Brandt & Ratzeburg, 1833

A native anadromous species, ascending the Danube ( Bănărescu 1964; Radu et al. 2008); much afflicted by the construction of the Iron Gates dams and by overfishing/poaching, this species is at the brink of extinction in Romanian waters, natural reproduction being all but absent; the population is maintained by supportive stocking (Oțel 2007; Maximov et al. 2014; Cocan & MireȘan 2018; Holostenco et al. 2019; Iani et al. 2019; Dobrev Mihov et al. 2022; Strat & Gheorghe 2023).