Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 87. (Budapest 1995)

Dulai, A.: Middle Miocene (Badenian) lunulitiform Bryozoa from Szob (Börzsöny Mts., Hungary)

regular internal structure was found with the repetition of a few basic elements. Miocene Bryozoa (of which 5 species belong to lunulitiform Bryozoa) of NW Germany were described by BUGE (1973). CADÉE (1975) described seven recent lunulitiform Bryozoa from the Guyana shelf, from which two were new. Three Miocene species were mentioned by CADÉE (1977) from West Germany. Miocene Bryozoa of Austria were summarized by VÁVRA (1977, 1979). Cupuladria canadensis was divided into three subspecies by CADÉE (1979, 1981). Badenian (Middle Miocene) lunulitiform Bryozoa of Korytnica Basin and Vienna Basin were examined by BALUK & RADWANSKI (1977b, 1984a, b). In their later work a new family (Discoporellidae), a new genus (Reussirella) and a new species {Cupuladria vindobonensis) were described. A SEM atlas of type and figured material from LAGAAU (1952) was presented by BISHOP & HAYWARD (1989). Five lunulitiform species were mentioned from the Pliocene deposits of SW Spain by REGUANT (1993). LOCALITY The locality is situated at the SW slopes of the Börzsöny Mountains, N Hungary. The old sandpit is NW of Szob on the left bank of Ipoly river, where the Damásd stream crosses the high road between the villages Szob and Ipolydamásd (Fig. 1). In the older literature this locality was mentioned as "Szob, Nagyfeltárás" (big outcrop). The fossils of the yellowish-grey sand were already studied from the mid-nineteenth century owing to its rich mollusc fauna. After many smaller papers the mollusc fauna was examined monographically by CSEPREGHY-MEZNERICS (1956). A short list is given in her work about the foraminifers of the locality. MÜLLER (1984) wrote about some decapods from Szob. MANZONI (1877) mentioned Cupularia haidingeri Bryozoa species from the locality. In the same way as in the publications, mollusc centralisation is a characteristic feature of the the collection of the Department of Geology and Paleontology of the Hungarian Natural History Museum, where molluscs form more than 90 per cent of the material of Szob. MATERIAL AND METHODS The examined material is derived from the coarse fraction (>2 mm) of 10-12 kg washed sand of Szob. The composition of the more than 10,000 specimens is the following (Fig. 2a): bivalves are the most frequent (46.57%), gastropods are significant (25.82%), but more than one-quarter of the fossils are composed of the other groups (27.6%). Taking the other fossil groups into consideration (Fig. 2b) it can be seen that worm tubes are the most frequent (45.4%). Bryozoa (27.92%) and vertebrates (otoliths, fish-teeth and bones: 19.46%) are also significant, but decapods (4.41%) and scaphopods (2.75%) are less important. Within Bryozoa (Fig. 2c) the number of lunulitiform Bryozoa is more than three times larger than that of all the other Bryozoa. Two lunulitiform species can be found in the Szob material: Cupuladria vindobonensis BALUK et RADWANSKI and Reussirella liaidingeri (REUSS). The specimens are deposited in the Department of Geology and Paleontology of the Hungarian Natural History Museum in Budapest (inventory numbers: M.94.154.-M.94.175.). Measurements of Bryozoa were taken according to COOK'S (1965a) methods. The length of zooecia was measured from the distal edge of the aperture to the distal edge of the next succeeding radial zooecial aperture, including the vibraculum. Mean, range and standard deviation of 50 measurements are given (5 zooecia of 10 specimens) for both species (Tables 1-2). One hundred measurements of the number of basal pores are given for Cupuladria vindobonensis BALUK et RADWANSKI (10 basal sectors of 10 specimens) (Table 3). For Bryozoa terminology BASSLER (1953) and COOK (1965a, b) are followed.