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Found 3 results

  1. oilshale

    Oligophus moravicus (Pauca, 1931)

    Alternative combinations: Diaphus moravicus and Leuciscus moravicus. Taxonomy according to Fossilworks.org. Description of Oligophus moravicus according to Přikryl et al. 2017, pp. 219-220: “The following description is based on the almost complete specimen Tv 1023a and its counterpart specimen Tv 1023b. They show a preorbital length much shorter than orbit diameter. The head is rounded, with an antero-dorsally oriented mouth. The lower jaw joint is located far posterior to the posterior-most margin of the orbit. The maxillary is slender throughout. There is no indication of a supramaxilla. The cleithrum seems to be delicate without well-developed posterior lamina. The vertebral column is not completely preserved in any of the specimens, but the total number of vertebrae seems to be 34 or 35. Remains of ventral procurrent rays are recognizable and therefore the vertebral number cannot have been much higher; about 16 centra are abdominal. Nine pairs of ribs are preserved. The pectoral fins are long, reaching the level of the posterior third of the abdomen, and are composed of about 13 rays. The pelvic fins are located below the dorsal-fin insertion and consist of seven or eight rays; the pelvic girdle is inadequately preserved. The dorsal fin is located at midlength of the body length and is composed of slightly more than 11 rays. The anal fin contains 12 or 13 rays. The body is covered by cycloid scales. The individual photophores are slightly thickened and although the complete photophore formula is not recognizable, a reconstruction of the preserved part shows the pattern reported in Figs. 3 and 4. The fish is slightly distorted midventrally, so that the photophores of the right side area appear to be located higher than on the left side (colour-coded in Fig. 3). The photophores appear to be lens-like. There are faint indications of two photophores just above and below the pectoral-fin base which could represent the PLO and the upper PVO. The four rear PO are preserved, with PO4 being slightly elevated. Five VO, none of them elevated, and three SAO are clearly discernable, the three SAO being located on a straight upward directed line. The AO sequence is apparently incomplete posteriorly and appears to be separated in an anterior and a posterior part. Other photophores are not clearly recognizable. The inner faces of both the saccular otoliths of the specimens Tv 1023a and Tv 1023b are exposed (Fig. 5A, B). The overall outline of the otolith is moderately elongate with a long rostrum, a depressed predorsal rim, a strongly developed and far backward positioned postdorsal angle, a blunt posterior rim and a regularly bent ventral rim. The length to height ratio of the otolith is 1.2 to 1.3. The ventral rim bears 7 strong denticles. The length of the rostrum is about 15% of the otolith length; excisura and antirostrum are weak. The inner face shows a slightly supramedian positioned sulcus with the ostium being longer but slightly narrower than the cauda. The ratio between the length of ostium and cauda is 1.3-1.5. A ventral pseudocolliculum is well developed below the caudal colliculum. The dorsal field bears a large dorsal depression; the ventral field shows a distinct ventral furrow at some distance from the ventral rim of the otolith. The inner face is nearly flat. The outer face is exposed in the specimen Tv 1025 and is distinctly convex and smooth with a postcentral umbo.” Line drawing of Oligophus moravicus from Přikryl et al, 2017, p. 220. Identified by oilshale using Přikryl et al. 2017. References: Pauca, M. (1931): Zwei Fischfaunen aus den oligozaenen Menilitschifern von Mähren. Annalen des Naturhistorischen Museums in Wien 46: 147-152. Prokofiev, A. M. (2006): Fossil Myctophoid Fishes (Myctophiformes: Myctophoidei) from Russia and Adjacent Regions. Journal of Ichthyology 46 (Suppl. 1): S38-S83. DOI: 10.1134/S0032945206100043 Gregorova, R. (2004): A new Oligocene genus of lanternfish (family Myctophidae) from the Carpathian Mountains. Revue de Paléobiologie, Genève 9: 81-97. Přikryl, T., Schwarzhans, W., Kovalchuk, O. (2017): Lanternfishes (Myctophidae) with otoliths in situ from the Early Oligocene of the Eastern Paratethys (western Ukraine). Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 285 (2): 213-225. https://doi.org/10.1127/njgpa/2017/0678
  2. oilshale

    Propteridium sp.

    Very probably Propteridium profondae Ciobanu, 1970. Taxonomy according to Přikryl, 2018. From Fahay, 2007, p. 649: “The order Ophidiiformes (sensu Cohen and Nielsen 1978; Nielsen et al., 1999) contains the suborders Bythitoidei, viviparous forms with an external intromittent organ, and Ophidioidei, oviparous forms with pelvic fins at level of preopercle or farther anterior, and caudal fin confluent with dorsal and anal fins.” Description of Propterides profondae according to Přikryl and Carnevale, 2018, p. 482: “The head is more or less triangular in shape; its length is contained about four times in SL. The cranial bones are difficult to recognize due to inadequate preservation. The ethmoid region is thick and expanded. The vomer is edentulous. The orbit is rather large; its diameter equals the snout length. The frontals are expanded posteriorly, becoming narrow in the orbital region. The mouth gape is slightly oblique and extends posteriorly at the level of the midlength of the orbit. The premaxilla is poorly preserved and bears a single row of tiny and well-spaced teeth. The maxilla is distally expanded and spatulate. The lower jaw protrudes anteriorly beyond the anterior margin of the upper jaw. The lower jaw joint is located at the level of the midlength of the orbit. The dentary is relatively low. The dentary teeth seem to be similar to those of the upper jaw. There are eight branchiostegal rays. The vertebral column consists of approximately 47 (12 abdominal plus 35 caudal) vertebrae. The vertebral centra are rectangular, longer than high, becoming smaller and more elongate posteriorly. The five posterior abdominal vertebrae bear large and approximately triangular parapophyses with distally pointed tips (Fig. 6A). Pointed dorsal prezygapophyses are well-developed throughout the vertebral column, whereas ventral prezygapophyses solely characterize the caudal centra (Fig. 6B, C). There are about seven pairs of ribs, of which the posterior rib is associated with the penultimate abdominal vertebra (Fig. 6A). Fragments of intermuscular bones are also preserved; however, their original number and relative position is difficult to interpret. The median fins and their internal supports are only partially preserved. The caudal fin and its skeletal support are not preserved. The preserved portion of the dorsal fin originates above the seventh or eighth abdominal vertebra, although it seems to be slightly displaced from its original position. About 50 dorsal-fin rays can be recognized, although their original number was certainly higher. The size and limits of the anal fin can be recognized, but due to inadequate preservation it is not possible to interpret the actual number of anal-fin rays and the morphology and configuration of the anal-fin pterygiophores. The dorsal-fin rays appear to be longer than their opposite anal-fin rays. The pectoral fin contains about 17 elongated rays that extend posteriorly beyond the tenth abdominal vertebra. The structure of the pectoral girdle is unclear. The pelvic fins are thoracic and contain two filamentous rays. The basipterygia are not recognizable. Thin and small cycloid scales are preserved in caudal region of the body (at the level of the vertebrae 20th to 23th).” Identified by T. Přikryl (Institute of Geology, Academy of Sciences of the Czech Republic) as Propteridium sp. References: Fahay, M. P. (2007): Early stages of fishes in the Western North Atlantic Ocean: Davis Strait, Southern Greenland and Flemish Cap to Cape Hatteras. Northwest Atlantic Fisheries Organization, Dartmouth, Nova Scotia, Canada, 1696 p. Arambourg, C. (1967): Les Poissons oligocénes de lʼIran. Notes et mémoires sur le Moyen-Orient 8, 9–247. Ciobanu, M. (1970): Date noi asupra peştilor fosili din Oligocenul dela Piatra Neamţ (II). Studii şi Cercetari 1, 67–90. Ciobanu, M. (1977): Fauna Fosila din Oligocenul de la Piatra Neamt. 1-159. Přikryl, T. & Carnevale, G. (2018): Ophidiiform fishes from the Oligocene–early Miocene of Moravia, Czech Republic. Bulletin of Geosciences 93(4), 477–489 (12 figures, 3 tables). Czech Geological Survey, Prague. ISSN 1214-1119. https://www.doi.org/10.3140/bull.geosci.1724
  3. oilshale

    Propercarina sp.

    Probably Propercarina cf. rebeli Pauca, 1929. Alternative name: Palimphyes cf. rebeli (Pauca, 1929). Taxonomy according to Fossilworks.org. Diagnosis for the genus Propercarina according to Prikryl et al., 2014, p. 693: “Emended diagnosis (according to Pauca, 1929, 1934 and Bannikov, 1995, 2010, modified): Body elongated. Dorsal and ventral edges of body are almost parallel and they run alongside the axis of the vertebral column; the body is covered by small cycloid scales; the lateral line is parallel to the dorsal edge of the body and runs just dorsal to the vertebral column; massive but short preorbital area (snout); mouth gap is moderate; jaws possess teeth; ventral edge of the preopercle smooth; the postcleithrum is massive and long (almost reaching the ventral profile of body); three predorsals; two separated dorsal fins (first with six to nine spines; second with one spine and numerous posteriorly shortened soft rays); the dorsal fins are separated by about 5 or 6 ray-less interneurals; anal fin with two short spines and numerous soft rays; anal-fin rays more numerous than soft dorsal-fin rays; pectoral fins are relatively short and situated just under the level of the vertebral column; pelvic fins with a spine and 5 rays, located under pectoral fins, present in adults; caudal fin is moderately long and forked; 35–36 rectangular vertebrae with the posterior abdominal ones bearing long parapophyses with associated thin and long ribs.” Line drawing from Bannikov, 1995, p. 179. Identified by T. Prikryl (Institute of Geology, Academy of Sciences of the Czech Republic) as Propercarina sp. References: Bannikov A.F. 1995. Morphology and phylogeny of fossil stromateoid fishes (Perciformes). Geobios 28 (Supplement 2): 177–181. https://doi.org/10.1016/S0016-6995(95)80109-X Prikryl, T., Kania, I., and Krzeminski, W. (2016): Synopsis of fossil fish fauna from the Hermanowa locality (Rupelian; Central Paratethys; Poland): current state of knowledge. Swiss Journal of Geosciences, 109 (3): 429–443. https://doi.org/10.1007/s00015-016-0216-5 Prikryl, T., Bannikov, A. F., Gradianu, I., Kania, I., Krzeminski, W. (2014): Revision of the family Propercarinidae (Perciformes, Stromateoidei) with description of a new species from the Oligocene of the Carpathians. Comptes Rendus Palevol 13(8) 691-700. https://doi.org/10.1016/j.crpv.2014.07.001
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