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

Pleuronautilus mosis MOJSISOVICS, 1882 Trachynautilus cf. nodulosus (ARTHABER, 1896) Germanonautilus cf. salinarius (MOJSISOVICS, 1882) Paranautilus cf. indifferens (HAUER, 1892) Syringonautilus cf. Mams (MOJSISOVICS, 1882) Sybillonautilus cf. pertumidus (ARTHABER, 1896) Except the two new species, the others are known mostly from the Alpine—Mediterranean area. Two species (A. rollieri, P. mosis) were reported earlier from the Balaton Highland (see LÓCZY 1913, 1916). Most of the nautilids (23 specimens) occurred in the Balatonicus Subzone, comprising the lower, thickest part of the section. The Zoldianus Subzone yielded 9 specimens, whereas in the Binodosus Subzone 5 nautilid specimens were found. The abundance of nautilids seems to change together with that of the ammonoids. The preservation is variable and shows differences through the section. In the deeper parts (Balatonicus Subzone) the silification of the shells is prevalent. This is advantageous for the preservation of the external ornamentation, but conceals the suture lines. The body chambers were filled with sediment and were more ore less compressed during later compaction. The phragmocones have silica or crystalline quartz infilling. In the higher part of the section (Zoldianus and Binodosus Subzones) the shells were dissolved or were replaced by sparry calcite; nautilids occur here as internal casts. Sometimes only the body chambers were filled with sediment and remained as casts, while the phragmocones, filled with sparry calcite, usually can not be extracted from the matrix. The material is deposited in the Department of Geology and Palaeontology of the Hungarian Natural History Museum (Budapest). The figured specimens are under the inventory numbers M.99.104 to M.99.108 and M.99.114to M.99.123. Systematic descriptions In the following descriptions the systematics of the "Treatise" (KUMMEL 1964) is used. The dimensions are given in millimetres and in percentages of the diameter (in parentheses). The abbreviations used: D = diameter WH = whorl-height WW = whorl-width U — diameter of umbilicus UP = diameter of umbilical perforation Subclass Nautiloidea AGASSIZ, 1847 Order Nautilida AGASSIZ, 1847 Superfamily Tainoceratoidea HYATT, 1883 Family Tainoceratidae HYATT, 1883 Genus Anoploceras HYATT in ZlTTEL, 1900 Anoploceras cf. rollieri (ARTHABER, 1896) (Plate I: 1) 1896 Pleuronautilus Rollieri ART. — ARTHABER, p. 28, pl. I, figs 3a-c, 4a-b. V non 1916 Pleuronautilus cf. Rollieri ARTH. — LÓCZY, p. 109. Material — A single, incomplete cast of a body chamber (M.99.104.). Measurements: D WH WW U UP — 22 — — — Description — One side of the body chamber is almost complete from the trace of the last septum to the slightly perceptible peristome; the other side is broken. The cross-section is slightly depressed, subquadrate. The venter is gently arched, smooth; the ventrolateral margin is blunt. The lateral side is fiat, the umbilical margin is angular, slightly overhanging. The lateral side is ornamented with strong, rursiradiate ribs having (or passing into) bullae at their ventrolateral and umbilical ends. The ventrolateral bullae pass into fine, dense, posteriorly projected riblets (growth lines ?) on the ventral margin. Remarks — A. rollieri differs from other Anoploceras species in having weaker, more irregular and widely spaced ribbing. The specimen mentioned in the faunal list by LÓCZY (1. c.) (deposited in the collections of the Hungarian Geological Survey under the inventory number T. 3148) is a smooth form without any ribbing and definitely does not belong to A. rollieri. Distribution — A. rollieri was described by ARTHABER (1896) from the Reifling limestones of Tiefengraben representing the upper part of the Balatonicus Zone (Pelsonian, Middle Triassic) (ASSERETO 1971, TATZREITER & VÖRÖS 1991). The Aszófő specimen came from Bed 77 (Aszófő I.), belonging to the Zoldianus Subzone of the Balatonicus Zone (VÖRÖS 1987).