Gorjanovicia endrissi Böhm, 1927
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publication ID |
https://doi.org/ 10.5281/zenodo.13190185 |
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persistent identifier |
https://treatment.plazi.org/id/03EE87EC-FFA6-FFBE-477D-D5F3BF9085BE |
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treatment provided by |
Felipe |
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scientific name |
Gorjanovicia endrissi Böhm, 1927 |
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Gorjanovicia endrissi Böhm, 1927 View in CoL
Fig. 7c View Fig
1927 Radiolites endrissi n. sp. Böhm, p. 210, pl. 14, figs 1-7.
1967 Gorjanovicia lipparinii - Polšak, p. 107, pl. 67, fig. 31.
2011 Gorjanovicia endrissi ( Böhm, 1927) View in CoL - Fenerci-Masse et al., p. 2, text-fig. 1; p.8, text-fig. 5; p.17-18, text-figs. 12-13.
Material: one fragment of lower valve. (sample no. 24079 BBU-MPS)
Description: The shape of right valve is cylindro-conical, 30-60 mm in length, characterized by a compact shell structure. The transverse section is circular to oval in shape and the diameter ranges from 18x 25 mm to 36x 40 mm. The ornamentation consists of well-developed longitudinal costae, which are acute ribs in small specimen and blunt or roundish costae in larger specimen.
The outer shell layer is 3-4 mm thick and composed of compact prismatic calcite. The ligamental ridge is well developed, having 3 mm length in small specimen and 7 mm in the other and generally 1 mm wide ( Fig. 7c View Fig ). The extremity of the ligamental ridge is triangular and truncated. The ventral band (Vb) is 5-10 mm wide and concave located between two rounded costae. The posterior band of the two specimens is flat, 10 and 15 mm wide respectively and has three fine rounded costae ( Fig. 7c View Fig ). The interband is narrower than the bands, forming a shallow groove, 9-10 mm wide between two pronounced ribs ( Fig. 7c View Fig ).
Discussion. A revision of all described Gorjanovicia species and of their diagnostic taxonomic criteria has been made by Fenerci-Masse et al. (2011) so that three taxonomic groups, each defined by a key species are currently recognized based on quantitave analisys of morphological characters: Gorjanovicia endrissi (Boehm) , G. ugarensis
Sliskovic´ and G. kvarneri Polšak. Our specimens are similar with Gorjanovicia lipparinii described by Polšak (1967) from Istria in Santonian-lower Campanian deposits. Actually, this species is considered as junior synonym of Gorjanovicia endrissi Böhm (sensu Fenerci-Masse et al., 2011) being assimilated into this taxonomic group. Group of Gorjanovicia endrissi is characterized by flat anterior band ( AB), generally concave interband (I) and flat or concave posterior band ( PB), numerous costae and ornamented PB. The broad variations of morphological characters within this group are regarded as echophenotypic variations ( Fenerci-Masse et al., 2011).
Age and distribution: Coniacian in Greece ( Steuber, 1999); late Santonian in Slovenia ( Pleničar and Jurkovsek, 1998), Santonian-early Campanian in Croatia ( Polšak and Mamuzic, 1969; Polšak, 1967; Polšak et al, 1982), Italy ( Caffau and Pleničar, 1995), Romania (this study) and early Maastrichtian in Turkey ( Fenerci, 1999).
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