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

Paleoecology — LELOUP & VOLZ (1938) indicated I. rissoi from near shore environments of littoral rubbles and rocky cliffs of the Adriatic Sea. According to BALUK (1971) chitons of the Korytnica clays (including I. rissoi) lived in depth less than 10 m. RIEDL (1983) mentioned this species from crevices in shallow coastal areas. Recent representatives of I. rissoi sometimes may be very common locally under stones on clean sandy bottoms (POPPE & GOTO 1991). DELLANGELO et al. (1998) have found that /. rissoi normally lives in very shallow habitats (1-5 m) adhered to rock surfaces or dead shells. It is rare in deeper waters, but always on hard bottom. GRAYSON & CHAPMAN (2004) recognized that genus Ischnochiton is found predominantly on the lower surfaces of boulders and appears to be a habitatspecialist. Subfamily Lepidochitoninae IREDALE, 1914 Genus lepidochitona GRAY, 1821 Lepidochitona sp. (Plate II: 7-9.) Material — Bánd: 2 intermediate valves. Description — The shape of the small-sized intermediate valves is wide triangular (Plate II: 7, 9). Relatively large pores, rounded at the lateral part and more elongated at the jugal part cover the strongly eroded surface. The pores are regularly arranged, forming two intersecting rows (Plate II: 8). The elongated pores seem to be alternately appearing in the neighbouring rows at the jugal part. Apophyses are missing at both specimens. Remarks — Both valves are strongly eroded and fragmentary, therefore the accurate identification is not possible at species level. Contrary to the lepidochitona kpida specimens from Szokolya-2 borehole (DULAI 2001), the granulated ornamentation is not observable on the surface of these valves. However, the outline of the fragmentary specimens refers to the intermediate valve of genus lepidochitona. The intersecting character of the pore systems may refer to their relation to L kpida (REUSS 1860). Family Chitonidae RAFINESQUE, 1815 Subfamily Chitoninae RAFINESQUE, 1815 Genus Chiton LINNAEUS, 1758 Chiton corallinus (RlSSO, 1826) (Plate IV: 1-4) I860: Chiton denudatus m. n. sp. — REUSS, p. 55, pi. 8, figs 14—15. 1897: Chiton olivaceus var. plioparva SACC. — SACCO, p. 89, pi. 7, figs 1-5. 1934: Chiton (Clathropleura) corallinus denudatus RSS. — SULC, pp. 24—25, pi. 2, figs 44-45. 1962: Chiton {Chiton) corallinus (RlSSO, 1826) — MALATESTA, pp. 163-164, text-fig. 20. 1971: Chiton denudatus Rams, 1860 — BAI.UK, pp. 462-463, pi. 5, figs 9-11. 1977: Chiton corallinus (RlSSO, 1826) — LAG Hi, p. 109, pi. 2, figs 9-12. 1979: Chiton corallinus (RlSSO, 1826) — SABELLI & TAVIANI, pl. 1, fig. 7. 1984: Chiton corallinus (RlSSO, 1826) — BALUK, pp. 290-291. 1984: Chiton olivaceus VAT.plioparva SACCO, 1897 — FERRERO MORTARA et al., p. 299. 1988: Chiton corallinus (RlSSO, 1826) — STUDENCKA & STUDENCKI, p. 41, pi. 3, figs 1-4. 1988: Chiton corallinus (RlSSO, 1826) — MACIOSZCZYK, p. 54, pi. 3, figs 1, 3. 1991: Chiton corallinus (RlSSO, 1826) — POPPE & GOTO, p. 60, pl. 1, fig. 13. 1998: Chiton (Rhyssoplax) corallinus (RlSSO, 1826) — DELL'ANGELO et al., pp. 248-249, pi. 3, figs 3, 6. 2003: Chiton corallinus (RlSSO, 1826) — KROH, p. 133, pl. 1, figs 2-3. 2004: Chiton corallinus (RlSSO, 1826) — CHIRLI, p. 13, pi. 4, figs 17-18, pi. 5, figs 1-2. Non 1988: Chiton corallinus (RlSSO, 1826) — MACIOSZCZYK, p. 54, pi. 3, fig. 2. Material — Bánd: 1 intermediate valve. Description — The outline of the intermediate valve is wide rectangular, slightly trapezoidal. The wide and rectangular jugal area is smooth but shows several pores, which are arranged in closely spaced longitudinal rows. The lateral area is also smooth, without any ribs, but shows also numerous and sometimes larger pores arranged in radial rows. The pleural area is ornamented by 6—7 Explanation to Plate III 1-5 Ischnochiton rissoi (PAYRADEAU, 1826). 1 Tail valve — (L: 2.8 mm; W: 4.2 mm), Devecser, 18x. 2 Details of image 1 — mucro of the tail valve and the numerous rows of pores both at postmucronal and antemucronal area, 60x. 3 Details of image 2 — arrangement of macro- and microaesthetes within the rows of pores, and some bioerosional traces, 300x. 4 Details of image 3 — macro- and microaesthetes, 1500x. 5 Details of image 1 — shallow, concentrical grooves of the postmucronal area, 150x. 6-8 Chiton (Rhyssoplax) olivaceus SPENGLER, 1797. 6 Tail valve — (L: 2.8 mm; W: 4.7 mm), Bánd, 16x. 7 Details of image 6 — slightly diverging longitudinal ribs of the antemucronal area, 180x. 8 Details of image 6 — arrangement of macro- and microaesthetes of postmucronal area, 125x.