Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 19. 2001. (Budapest, 2001)

Genus Cryptoplax de BLAINVILLE, 1818 Cryptoplax weinlandiSULC, 1934 (Plate II: 4-6, Plate III: 1-6) 1896 Cryptoplax weinlandi (ROLLE) — BOETTGER, p. 180. 1934 Cryptoplax weinlandi (ROLLE) SULC — ŐULC, pp. 21-23, pi. 2, figs. 36-40. 1934 Cryptoplax weinlandi SULC — ZlLCH, pp. 199-200, pl. 1, figs. 18-22. 1964 Cryptoplax weinlandi SuLC — MARINESCU, pp. 183-184, pi. 4, figs. a-e. 1971 Cryptoplax weinlandi SULC — BALUK, p. 466, pi. 6, figs. 1-8. 1977 Cryptoplax weinlandi SULC — LAGHI, p. 114. 1984 Cryptoplax weinlandi SULC — BALUK, p. 294. Material — A single tail valve (pl. III. figs 1-6) (borehole Szokolya-2, 92.7-93) (M.99.112). Measurements (mm): length width M.99.112 2.4 1.26 Descriptions — The jugal area of the tail valve is smooth while the lateral areas are ornamented by a few (4-^4) longitudinal, slighdy undulate ribs. Both the jugal area and the lateral areas bear lots of small pores. Small pores can also be seen on the ventral surface of the tail valve, but only at the jugal area. The pores are round in outline at both sides of the valve. The apex of the only valve is covered by epizoans. The length of suturai plates of the tail valve is about 1 /2 of the whole length of the valve. Remarks — The only Hungarian specimen correspond well both with the illustrations given in the literature and the Transylvanian specimens deposited in the collection of Hungarian Natural History Museum. It was indicated by BALUK (1971) that Cryptoplax genus is unknown in recent European seas and it was regarded as typical of the Indo-Pacific regions. However, LELOUP (1980) described a new species, Cryptoplax enigmathus LELOUP from the Red Sea, which differs from Cryptoplax wdnlandi SULC in a smaller size and in the granulated ribs on the lateral areas. An intermediate valve of C. weinlandi SULC from the Transylvanian material of the Hungarian Natural History Museum is given at Plate II: 4—6 as comparative material. Distribution — This species has hitherto been mentioned from several localities of the Central Paratethys. SULC (1934) described it from the Vienna Basin and Bohemia (Steinabrunn, Niederleis, Forchtenau, Porzteich, Rudoltice, Kninice, Sudice, Borac, Zidlochovice, Lysice localities). This species is well-known in Romania, both from the Transylvanian Basin (BOETTGER 1896, ZlLCH 1934) and the Dacian Basin (MARINESCU 1964). Cryptoplax weinlandi SULC is also abundant in the Korytnica Basin in Poland (BALUK 1971, 1984). It was also mentioned from the Miocene deposits exposed near Modena, Italy (LAGHI, 1977). It is one of the most frequent Miocene chitons of the Central Paratethys, particularly well represented at Läpugiu and Costei (ZlLCH 1934). Cryptoplax margitae n. sp. (Plate IV: 1-6) Holotype — Hungarian Natural History Museum, Department of Geology and Paleontology; inventory number: M.99.113. Type locality — borehole Szokolya-2, 92.7-93 m; Börzsöny Mts, Hungary, Central Paratethys. Type strata — Badenian (Middle Miocene) marly sandstone. Derivation of name — after the name of Dr. Margit BOHN—

HAVAS, retired paleontologist of the Hungarian Geological Institute. Diagnosis — Small-sized Cryptoplax with 5-5 granulated ribs on the lateral areas of the intermediate valve. Short suturai plates on the intermediate valve. Oval pores at the ventral side of the jugal area of the intermediate valve. Material — One intermediate valve (borehole Szokolya-2, 92.7-93 m). Measurements (mm): length width M.99.113 2.86 1.16 1-3 4-6 Explanation to Plate II Acanthochitona faluniensis (ROCHEBRUNE, 1883); head valve; Szokolya-2, 92.7-93 m; M.99.111. — 1: dorsal view, x 39; 2: dorsal view (detail of Plate II: 1), x 100; 3: dorsal view (detail of Plate II: 2), x 300. Cryptoplax weinlandi §ULC, 1934; intermediate valve; Kostej, M.60.10797. — 4: dorsal view, x 20; 5: dorsal view (detail of Plate II: 4), x 300; 6: dorsal view (detail of Plate II: 5); x 1000. Fragmenta Palaeontologica Hungarica 19, 2001