Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 23. 2005. (Budapest, 2005)

ribs. These ribs are closely spaced and much wider than the grooves between them (Plate IV: 10; Plate V: 4). These ribs split into granules at the sides of the jugal area and towards the mucro. The mucro is sometimes prominent (Plate V: 1). The lateral areas are ornamented by closely spaced rounded granules, which are similar to head valve granules (compare Plate IV: 6 and 9) or less prominent due to the erosion of the specimen (Plate V: 2). The irregular shaped apophyses of the intermediate valves are wide and long. There is a shallow slit at the lateral side of the apophyse (Plate IV: 8; Plate V: 3). Remarks — Acanthochitona fasdcularis is similar but has fewer and larger granules both on head and intermediate valves (e.g. CHIRLI 2004; Plate 6: 10, 13). LAGHI (1977) synonymized this species with A. communis but this opinion was rejected most of the subsequent workers, because the shape of the tegmentum is different at these two species. Therefore, LAGHI's (1977) A. communis specimens (Plate 3: 13-19) should initiate into the synonym list of A. faluniensis, as it was indicated with question mark by MACIOSZCZYK (1988). TOMASOVYCH (1998) illustrated A. fasdcularis from Devínska Nová Ves but the ornamentation of the valves refers to A. faluniensis. KROH (2003) published an intermediate and a tail valves, from which the fragmentary intermediate one is similar to the Bánd specimens. KROH (2002) have also found this species in the Badenian sediments of Gainfarn. Until now, tail valve of A. faluniensis is not known from Hungary. JAKUBOWSKI & MUSIAL (1977, 1979) mentioned A. faluniensis from Late Badenian sandy deposits of the southern Roztocze Hills in Poland, while STUDENCKA & STUDENCKI (1988) from the Late Badenian of Western Ukraine. According to STUDENCKA & STUDENCKI (1988) A. faluniensis is rather frequent both in the Lower and Upper Badenian deposits. The insertion plate of the head valve is not so wide as it, was in the case of Szokolya specimen (DULAI 2001, Plate 2: 1-2). Distribution — Miocene: Central Paratethys (Austria, Czech Republic, Poland, Ukraine, Slovakia, Hungary). Paleoecology — This species is known only from fossil assemblages but there are some extant species with similar outer morphology. A. crinita lives under stones on sandy bottoms between 0 and 3 m depths, while another recent species, A. fasdcularis can be found in deeper water environments (POPPE & GOTO 1991). BALUK (1971) mentioned not more than 10 m for water depth. According to MACIOSZCZYK (1988) A. faluniensis is rather common at the marginal zone of the algal-vermetid reefs (Wçglinek) and in the glauconitic sands at Wçglin. On the basis of a rich mollusc assemblage (46 species) TOMASOVYCH (1998) referred a deeper neritic environment for this species. According to KROH (2003) A. faluniensis is probably a shallow water taxon. Family Cryptoplacidae H. & A. ADAMS, 1858 Genus Cryptoplax DE BLAINVILLE, 1818 Cryptoplax weinlandi SULC, 1934 (Plate V: 5-12; Plate VI: 1-11; Plate VII: 1-15; Plate Vlll: 1-12) 2001: Cryptoplax weinlandi SULC — DULAI, p. 45, pi. 2, figs 4-6, pi. 3, figs 1-6. (cum. syn.) 2003: Cryptoplax weinlandi'Sui.C — KROH, pp. 135-136, pl. 1, figs 8-12. 2005: Cryptoplax viciani n. sp. — DELL'ANGELO et al., p. 11, Material — Bánd: 3 head, 28 intermediate and 9 tail valves; Devecser: 2 intermediate and 2 tail valves. Description — The head valve is elongated semicircular in outline (Plate V: 5). Closely spaced, slightly wavy longitudinal ribs ornament the tegmentum. Towards the mucro the ribs begin to slit into rounded granules (Plate V: 5—6). Another, slightly fragmentary and oval outlined head valve shows more granulöse character (Plate V: 7— 9). The tegmentum is strongly porous and the pores are situated in the grooves between ribs. The smaller ones (microaesthetes) can be seen at the deeper part of the grooves, while the fewer but larger ones (macroaesthetes) are at the sides of the grooves (Plate V: 6). If the ornamentation is granulöse, most of the pores are on the granules: the macroaesthete is in the central part and the microaesthetes are around the larger one (Plate V: 8—9). Explanation to Plate IV 1-4 Chiton corallinus (RlSSO, 1826). 1 Intermediate valve — (L: 1.9 mm; W: 4.6 mm), Bánd, 16x. 2 Details of image 1 — longitudinal ribs of the pleural area, 120x. 3 Details of image 2 — pores of groove between longitudinal ribs of the pleural area, 930x. 4 Details of image 1 — pores of the lateral area, 120x. 5-10 Acanthochitona faluniensis (ROCHEBRUNE, 1883). 5 Head valve — (L: 2.55 mm; W: 4.0 mm), Bánd, 19x. 6 Details of image 5 — rounded granules of the head valve, the arrangement of the macro- and microaesthetes on the granules, as well as some bioerosional traces, 90x. 7 Head valve — (L: 2.1 mm; W: 3.4 mm), Bánd, 22x. 8 Intermediate valve — (L: 2.8 mm; W: 4.4 mm), Bánd, 17x. 9 Details of image 8 — the rounded granules of the lateral area, 90 X. 10 Details of image 8 — the eroded surface of the jugal area, 150x.