Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 73. (Budapest 1981)
Vörös, A.: A survey of the Rhaetian (Upper Triassic) Bivalvia from Borzavár (Bakony Mts., Hungary)
Genus PINNA LINNÉ, 1758 Pinna (Pinna) cf. miliaria STOPPANT, 1857 (Plate I: 8) *1857: [Pinna] Miliaria STOPPANI, Studii geol., p. 387. 1861 : Pinna miliaria STOPP. —STOPPANI, Couches à Avicula. .., p. 63, pi. 8, fig. 3-6. pi. 9, fig. 1-3. 71870: Pinna miliaria STOPP.—FISCHER-OOSTER, Thun, p. 72, pl. IV, fig. 11. vl964: Pinna miliaria STOPPANI, 1861— VÉGH, Rhät. Südl. Bakonygeb., p. 37, 75. pl. III, fig. 9. Material : a fragmentary internal cast of a single valve. — L o c a 1 i t y : Borzavar, Rhaetian yellowish-pink limestone. Description : Medium sized (original length must have been over 100 mm), moderately inflated. The bad state of preservation makes impossible the exact orientation of the specimen,but it was probably a left valve. The umbo, together with the anterior part, is broken off. The dorsal margin is straight; the dorsal half of the posterior margin (?) is rather strongly arched. The median ridge is sharp; its angulation is about 135°; while the angle between the ridge and the dorsal margin is 16°. Both sectors of the internal cast are ornamented with radial ribs (seven in the dorsal sector) which become disintegrated posteriorly into rows of small swellings. These are arranged according to growth rings and are interpreted as equivalents of the granules of the original shell. Remarks: P. miliaria is a commonly cited but rarely documented species. The original description by STOPPANI (I.e.) makes a wide interpretation possible, especially as regards the number of radial ribs. It seems that later authors (ALASSINAZ 1962, p. 339; SIRNA 1968, p. 767) preferred the variant with relatively few (about 15) ribs, equivalent to fig. 3. on pi. 9. in STOPPANI (1861). The specimen from Borzavár corresponds to this picture and can be ranged into P. miliaria as a morphological side-member. Among the Rhaetian species, only P. meriani WINKLER, 1861 has a granulate ornamentation, but its granules are arranged into a regular cross-ruled pattern. Distribution : Rhaetian of the Southern Alps, the "Préalpes" and the Bakony Mts. (Hungary) and probably also of the Northern Limestone Alps and the Northern Appennines. Pinna (Pinna) blanfordi BOETTGER, 1880 (Plate 1 : 9) 71880: Pinna Blanfordi BOETTGER, Sumatra, p. 48, pl. Ill, fig. 4-6. 1908: Pinna cf. blanfordi, BOETTGER —HEALEY, Napeng Beds, Burma, p. 14, pl. I, fig. 24-26. Material : an almost complete internal cast of a right valve. •— Locality: Borzavár, Rhaetian grey limestone. Description : The shell is of small size for the genus (original length was probably less than 100 mm); strongly inflated, becoming flattened posteriorly. Outline is cuneiform; the umbo is terminal. The dorsal and ventral margins are equally straight; the angle between them is 30°. A sharp and sulcate diagonal ridge divides the surface of the internal cast into two equal sectors. The dorsal sector is flat and ornamented with 6 or 7 radial ribs and a few weak growth rugae. The ventral sector is convex, its ornamentation consists of strong, irregularly spaced growth rugae with crenulated radial elements. These radial lines are not arranged into continuous ribs but are displaced by the successive growth rugae. Remarks : The ornamentation of the specimen from Borzavár is very particular and different from all other Rhaetian forms except the Burmese specimen figured by HEALEY (I.e.). The original demonstration of the species P. blanfordi by BOETTGER (I.e.) seems to present a quite different form having more than 10 strong, radial ribs on both sectors of the valve. However, HEALEY examined BOETTGER'S original specimens and found them conspecific with her Burmese specimen. This opinion is accepted here. Distribution : Rhaetian of Sumatra, Burma, the Northern Limestone Alps (?) (see: HEALEY, 1. c.) and the Bakony Mts. (Hungary)
