Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 86. (Budapest 1994)

Hír, J.: Cricetus cricetus nanus Schaub, 1930 (Mammalia, Rodentia) finds from the Carpathian Basin

L - length of the tooth crown; Wa - anterior width of the tooth crown at the protocone-paracone height in the M2, M3 teeth and at the anterocone in M

1 and, correspondingly at the protoconid-paraconid height in the ml, m3 teeth, and at the anteroconid in ml. In the M2, M3, m3 molars the Wa = Wmaximal. Wp - posterior width at the hypocone-metaconc height in the upper teeth and in the hypoconid-metaconid height in the lower teeeth. In the MI, ml molars the Wp = Wmaximal. The measurements obtained were used to trace LAV scatter diagrams (Figs 11-16) and worked out by the basic statistic parameters: N - sample size; min.-max. - observation range; X - arithmetic mean; SD - standard deviation. All the measurements are given in mm (Tables 1, 3, 5, 7, 9, 11, 13). The morphological investigation is based on the nomenclature of FAHLBUSCH (1964) and MEIN & FREUDENTHAL (1971). The separation of the different morphotypes is after the presence or absence of certain elements of the tooth crown. Strongly worn teeth are not included in the morphological analysis. DESCRIPTION Order Rodentia BOWDICH, 1821 Family Cricetidae ROCHEBRUNE, 1883 Subfamily Cricetinae MURRAY, 1866 Genus Cricetus LESKE, 1779 Cricetus cricetus nanus SCHAUB, 1930 (Figs 1-19) Ml. The anterior (mesial) surface of the tooth always has a more or less developed conelet (pre-anterocone cingulum). The anterocone is split in every case (Fig. 1 ). The anterolophule connected the two cones of the anterocone with the protocone. In nearly 50% of the molars the paracone is anteriorly connected with the anterolophule by a more or less developed arm. In this case there is a closed basin between the protocone and paracone (A, B, C, G morphotypes) (Fig. 2). In other 50% of the teeth the paracone has no anterior connection (D, E, F types) (Fig. 3). The mesolophe is rare. It occurs only in the D, G morphotypes. It is narrow and reaches the labia! margin of the tooth crown in every case (Fig. 1). The metacone is connected with the posterolophe. The posterolophe has no free and. The metalophule exists only in the A, B, E morphotypes. It is weakly developed, touches the surface of the metacone but never reaches the centrum of the cone (Fig. 1, Table 2). M2. The labial and lingual anterocingulae are well developed. The protocone and paracone enclose a basin in the anterior part of the tooth crown. In the A, B morphotypes the anterior arm of the paracone has a short accessory branch called "paralophule" by the author (Fig. 4, Table 4). In the A, B, E morphotypes a short remnant mesolophe is visible. In the A, B, C, D morphotypes an enamel crest exists between the metalophule and posteroloph trimming the metacone on the lingual side (Fig. 4). This not rare element is called by the author "parametalophule". It was found in the M2 molars of the Allocricetus éhiki and Allocricetus bursae species too (HÍR 1989, 1992a, 1993). M3. The tooth crown bears an anterocingulum. In the B morphotype the lingual cingulum has a distal accessory arm (Fig. 5 B). In the C-type molars longitudinal enamel lines divide the basin between the protocone and paracone. In the D-typc tooth crowns the basin between the hypocone and endocone is divided by accessory enamel crests. The combination of the CD elements (Fig. 5 CD, Table 6) is frequent in the material of Osztramos 14. In the A-type the above-mentioned accessory elements are absent (Fig. 5 A). ml. The mesial surface of the tooth crown is smooth. Preanteroconid cingulum does not exist. The anteroconid is divided or weakly divided in the A, C, E, F moiphotypes. It is undivided in the B, D morphotypes(Fig. 6) This feature does not depend on the worn status of the tooth crown. The anterolophulid is generally weakly developed, but presented in the A, B, E, F morphotypes (Fig. 8). It is not developed in the C, D morphotypes (Fig. 7). A short mesolophid occurs only in one case (F-type, Table 8). In another case (E-type) the posterolophulid shows an Y-like ramification. The author calles this extra branch as "paraposterolophulid".