Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 24-25. 2007. (Budapest, 2007)
2 Duu The aim of this paper is to describe a local, Early Badenian (Middle Miocene) brachiopod fauna from the Bakony Mountains (Transdanubian Central Range). Since all of the three species are well-known from other parts of the Central Paratethys, as well as from the Recent waters, the systematic part is confined to short synonymy lists of the A. most recent records, some remarks, distribution and paleoecological data. The two Argyrotheca species are sufficiently numerous at Bánd locality to study size-frequency distributions. Finally, some comments on the observed epifaunal encrusters and predatory drill holes will be discussed. Localities and material The studied micromorphic brachiopods derive from two localities of the Bakony Mountains. The majority- of the specimens were collected from Bánd, while Devecser yielded only poor material of isolated valves (Figure 1). Bánd is a well-known Miocene locality 7 , from where bivalves and gastropods (KÓKAY 1966), corals (HEGEDŰS 1970; OOSTERBAAN 1990) and polyplacophorans (DULAJ 2005) were described. Recendy, two amateur collectors (Tibor BERTA, Tamás NÉMETH) have performed intensive collecting in 2003 and 2004 (BERTA & NÉMETH 2004). With several gastropod, bivalve, scaphopod, polyplacophoran, scleractinian, cirripedian, echinoid, fish, calcareous algae, bryozoan and decapod species, they have collected 422 micromorphic brachiopods, which belong to two species of Argyrotheca. Argyrotheca cuneata (RlSSO, 1826) (147), Argyrotheca cordata (RlSSO, 1826) (275). The second locality 7 is situated east of village Devecser, at Tik-hegy (Figure 1). CSEPREGHY-MEZNERICS (1958) listed several mollusc species from this locality 7 and recendy DULAI (2005) described 2 polyplacophoran species. The same amateur collectors have collected very diverse fauna from several artificial trenches in 2004 and 2005 (NÉMETH 2005). The yellow, calcareous sand yielded ven? few isolated brachiopod valves (5 specimens): Megathiris detruncata (GMELIN, 1790) (3), Argyrotheca cordata (RlSSO, 1826) (2). Though the studied brachiopods originate from T. NÉMETH's and T. BERTA'S private collections, a signifi cant part of their material has been deposited in the regional Bakon}' Natural History Museum, Zirc. Some specimens were also donated to the Hungarian Natural History Museum, Budapest. Figure 2 — Megathiris detruncata (GMELIN, 1790), Devecser. 1: Outer view of a dorsal valve (L: 1.9 mm; W: 3.2 mm), x24; 2: Inner view of a dorsal valve (L: 3.4 mm; W: 5.9 mm), xl3. Systematics Phylum Brachiopoda DUMÉRIL, 1806 Subphylum Rhynchonelkformea WILLIAMS, CARLSON, BRUNTON, HOLMER & POPOV, 1996 Class Rhynchonellata WILLIAMS, CARLSON, BRLNTON, HOLMER & POPOV, 1996 Order Terebratulida WAAGEN, 1883 Suborder Terebratellidina MUIR-WOOD, 1955 Superfamily Megathyridoidea DALL, 1870 Family Megathyrididae DALL, 1870 Genus Megathiris D'ORBIGNY, 1847 Megathiris detruncata (GMELIN, 1790) (Figure 2: 1-2) 1990: Megathiris detruncata (GMELIN, 1790) — BlTNER, pp. 135-138, text-figs 3-4, pi. 3, figs 1-8, pi. 6, figs 1-7. (cum. syn.) 2003: Megathiris detruncata (GMELIN, 1790) — KROH, pp. 147-148, pl. 1, figs 4-6. 2003: Megathiris detruncata (GMELIN, 1790) — BlTNIïR & MoiSSE'iTE, pp. 473-474, figs 6G, H. 2004: Megathiris detruncata (GMELIN, 1790) — BlTNER & DULAI, pp. 74-75, pl. Ill, figs 11-15. Material — 3 specimens (1 ventral and 2 dorsal valves) from Devecser.
