Ammonites from Zirc, Márvány-bánya (Marble Quarry). A – Pseudomoutoniceras annulare ( D ’O RBIGNY , 1842), (no.: K15233). B – Phyllopachyceras infundibulum ( D ’O RBIGNY , 1841), (no.: 

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... The overwhelming majority of lytoceratids were determined as the “classical” species of L. subfimbriatum and P. quadrisulcatus . Besides these common taxa N OSZKY listed L . cfr. Raricinctum , and F ÜLÖP some additional less known species, like L. vogdti, L. subsequens , and Leptotetragonites . These names and forms still require a revision. Protetragonites crebrisulcatus , generally regarded as a Barremian species, was figured from Márvány-bánya by N AGY (1981, pl. 1, fig. 3). This ammonite represents possibly an early silesitid, as discussed below. Costidiscus nodosocostatus was traditionally ranged into Lytoceratina. It was listed by N OSZKY (1934) and later also by F ÜLÖP (1964) and M ISZLIVECZ (1990). The genus is typical of the Early (but not earliest) Barremian, therefore its incidental presence is of special importance. However, during the revision it became clear that specimens labelled as Costidiscus were misidentified. They belong to the recently described Late Hauterivian genus Paracostidiscus (see also the remarks on Ancyloceratidae). Ammonitina Haploceratidae: Neolissoceras grasianum is a characteristic, easily identifiable ammonite which was listed by N OSZKY (1934) as Lissoceras Grasianum . It is a flat, smooth ammonite showing a typical oblique umbilical wall. The species is common in the Berriasian but it became extinct in the Late Hauterivian around the Sayni Zone (R EBOULET 1996) or even higher, but still in the uppermost Hauterivian. A close ally is Neolissoceras subgrasianum which was reported by D RUSHCHITS (1960) from the Barremian. The latter age was probably a misinterpretation. Desmoceratidae: The fauna is rich in desmoceratids. Numerous different species were listed by N OSZKY (1934) and subsequently by F ÜLÖP (1964) under several generic names like Desmoceras , Barremites , and Valdedorsella . All of these genera, plus Abrytusites , Melchiorites , and Plesiospitidiscus , are closely related and sometimes difficult to separate. In many cases their only significant difference lies in the whorl section, whereas the inner whorls of many forms are indistinguishable. In many cases, even the higher categories are uncertain. E.g., Plesiospitidiscus was usually placed within Desmoceratidae (W RIGHT et al. 1996), but some authors emphasise that it has holcodiscid features (H OEDEMAEKER 1995, C ECCA et al. 1998). Whereas the type species of Abrytusites ( A. neumayri ) is from the latest Hauterivian, it seems that Abrytusites could be a useful name for those Hauterivian taxa which are morphologically very close to the (possibly Aptian) Valdedorsella . From this point of view, the use of the Late Hauterivian genus Pseudovaldedorsella (introduced by C ECCA et al. 1998) seems to be unnecessary. Barremites (used basically for the Barremian group of B. difficilis and its close allies) also traces back to the Late Hauterivian. In general, many of the Márvány-bánya desmoceratids are very close to those forms which were described and figured from the latest Hauterivian of the Apennines by C ECCA et al. (1998). The whole group needs a revision, but this is far beyond the scope of this study. Silesitidae: This family in most cases unites very few genera with very few species. Silesites was traditionally used mainly for two species: for the Lower (but not lowermost) Barremian S. vulpes (C OQUAND ) and for the Upper Barremian – Aptian S. seranonis ( D ’O RBIGNY ) . On the other hand there are further, not very well-known, almost “forgotten” species in the ...