Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 24-25. 2007. (Budapest, 2007)

substrate for attachment is also interesting because there are lots of molluscs and colonial corals in the associated fauna, which probably offer more suitable attachment surfaces. Epifaunal encrusters are recorded for the first time on the micromorphic brachiopods in the Miocene Central Paratethys. Figure 9 — Bryozoan and serpulid encrusters on micromorphic brachiopods, Bánd — 1: Bryozoan encrustation on the ventral valve of Argyrotheca cordata (RlSSO, 1826) (L: 3.0 mm; W: 2.8 mm), xl8; 2: Detail of Figure 9:1, showing the encrusting Bryozoa, x75; 3: Detail of Figure 9: 2, showing the encrusting Bryozoa, xl70; 4: Serpulid encrustadon at the anterior end of ventral valve of Argyrotheca cordata (RlSSO, 1826) (L: 2.0 mm, W: 2.1 mm), x24; 5: Detail of Figure 9: 4, showing the serpulid tube, x75; 6: Remain of serpulid (?) encrustadon at the middle part of the dorsal valve of Argyrotheca cuneata (RlSSO, 1826), x80. Drilling prédation Drilling prédation has long evolutionary history with rich fossil record (KOWALEWSKI et al. 1998). Gastropod drillings arc especially frequent from Late Cretaceous to Holocene, but up to now, relatively few drilled brachiopods have been reported from the Cenozoic (LEIGHTON 2003; BAU MILLER & BlTNER 2004). The drilling frequencies can be rather variable even in localities near to each other: 39% at Weglin, 2% at Szczaworyz and 3.7% at Wçglmek (BAUMII

.1 .ER & BlTN

ER 2004). Table 1 — Drill hole data for Badenian brachiopods of the Bakony Mts. Species not drilled drilled drilled drilled drilled ventral dorsal on valve valve margin Megathiris detruncata 3 A rgyrotheca cordata 267 1(1 5 3 2 Argyrotheca cuneata 142 5 4 1 No drill holes were observed at the 5 Devecser specimens. Drill hole frequency is low at Bánd locality, too. Altogether 15 out of 422 specimens show traces of predator)

7 gastropod activities (3.5%) (Figure 10). If the two Argyrotheca species are counted separately, the result is verysimilar, although A. cordata has a slightly higher drilling frequency (A. cordatcr. 10 drilled specimens out of 275 (3.6%); A. cuneata: 5 drilled specimens out of 147 (3.4%)). It suggests that no taxon selectivity can be observed at the Hungarian material, in contrast with the Polish Wçglin locality, where Megathiris detmncata was preferentially drilled (BAUMILLER & BlTNER 2004). Drill holes can be found on either the ventral or the dorsal valve but in some cases the drill hole occurs on the margin, penetrating both valves (Table 1). Altogether 9 drill holes were found on the ventral valve, 4 drill holes on the dorsal valve and 2 drill holes at the margin of the valves. It suggests valve selectivity

7 to ventral valve's advantage, which does not correspond with BAUMILLER & BlTNER's (2004) results