Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 24-25. 2007. (Budapest, 2007)

Dimensions (mm) Length 1.9 3.4 6.3 Remarks — This species is rare in the investigated material, but very common at other localities of the Central Paratethys (e. g. more than 4000 specimens in the Roztocze Hills; BlTNER 1990). The variability in shape and ornamentation was mentioned by many authors and recendy was discussed by BlTNER (1990, text-fig. 4). She has mentioned some asymmetrical specimens that are not seen in the Devecser material. The internal characters of the brachial valve make this species easily distinguishable from Argyrotheca: two rudimentär}- lateral septa appearing in the specimens about 2 mm wide (Figure 2: 2). Palaeoecology — Attached by a short pedicle to firm substrates in cryptic habitats (cave walls and roofs, under boulders, coralligéne). It has a wide depth range from 5 to 896 m, but being most common in shallow waters (infralittoral-circalittoral) (BRUNTON & CURRY 1979; LOGAN & NOBLE 1983; LOGAN 2003; LOGAN et al. 2004). Distribution — Well-known species from the Eocene Width 3.2 5.9 6.1 (broken) to Recent. Eocene: Italy (DAVIDSON 1870; SACCO 1902; FABIAN! 1913), Hungary (BlTNER & DULAI in press); Miocene: Poland (JAKUBOWSKI & MESIAL, 1979 a-b; KRACH 1950; BARCXYK & POPIEL-BARCXYK 1977; STUDENCKI 1988; BlTNER 1990; POPIEL-BARCZYK & BARC/VK 1990); Ukraine (FRIEDBERG 1921); Austria (DREG

LR 1889; MEZNERICS 1943; KROH 2003; BlTNER & Dil.AI 2004); Hungary (MATYASOVSZKY 1880; MEZNERICS 1943); Romania (MEZNERICS 1943, BÁRBULESCU & RADO 1984; BlTNER & DULAI 2004); Italy (DAVIDSON 1870; SACCO 1902); France (JULIEN 1940); Spain (CALZADA 1978; LLOMPART & CALZADA 1982); Pliocene: Italy (DAVIDSON 1870); Spam (PAJAUD 1977; ENCTNAS & MARTINELL 1992); Algeria (BlTNER & MOISSETTE 2003); Pleistocene: Italy (GAETANI & SACCA 1983); Recent: Mediterranean Sea (LOGAN 1979, 2003; LLOMPART 1988; LOG AN et al. 2004); Atiantic Ocean (BRUNTON & CURRY 1979; LOGAN 1983, 1988, 1993); Caribbean Sea (COOPER 1977). Figure 3 — Argyrotheca Cuneata (RlSSO, 1826), Bánd. — 1: Dorsal view of a complete specimen (L: 2.3 mm; W: 2.5 mm), x22; 2: Dorsal view of a complete specimen (L: 2.2 mm; \Y: 3.1 mm), x21; 3: Dorsal view of brachial valve of a complete specimen showing the embryonal part, x40; 4: Ventral view of a complete specimen (L: 2.3 mm; W: 2.7 mm), x22; 5: Ventral view of a complete specimen (L: 1.7 mm; W: 3.0 mm), x22; 6: Inner view of a ventral valve (L: 2.2 mm; W: 2.8 mm), x20; 7: Inner view of a dorsal valve (L: 2.0 mm; W: 2.9 mm), x21.