Profile URL: https://hdl.handle.net/20.500.13091/11545
Job Title:Dr. Öğr. Üyesi
Email Address:makbas@ktun.edu.tr
Main Affiliation:02.07. Department of Geological Engineering
Status: Current Staff
ORCID:
0000-0001-8144-8939
0000-0001-8144-8939Scopus ID:
57223408955
57223408955YÖK Akademik: E98AA30E2244B5FF
Google Scholar:
1O0yp0IAAAAJ
1O0yp0IAAAAJWeb of Science ID:
ACD-9683-2022
ACD-9683-2022Name Variants:
Akbas, Melikan Akbaş, M.
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Publication Table 1 in Systematic Revision and Phylogenetic Assessment of the Family Neodiscidae (Foraminifera) and New Capitanian Foraminiferal Genera from the Ankara Region, Central Türkiye(2026) Akbaş, Melikan; Okuyucu, CengızTable 1 (continued on next page). List of the foraminiferal taxa described herein from the studied carbonate blocks KDY–1 and KDY–2. ForaminifersSampleIllustrationsKDY –1–1 KDY–2Neoschwagerina craticulifera•Fig. 4A–BNeoschwagerina pinguis•Fig. 4CNeoschwagerina sp.•Fig. 4DYabeina sp.•Fig. 4EChusenella tieni•Fig. 4FPostkwantoella goekcehueyuekensis•Fig. 4GLeella armenica•Fig. 4H–ICodonofusiella sp.•Fig. 4JKahlerina sp.•Fig. 4KNankinella orientalis••Fig. 4L–MNankinella acuta••Fig. 4N–ONankinella aff. chongyangensis•Fig. 4PNankinella sp.•Fig. 4QReichelina sp.•Fig. 4R–SGlobivalvulina vonderschmitti•Fig. 5AGlobivalvulina cyprica•Fig. 5B–CCharliella rossae••Fig. 5D–ESengoerina argandi•Fig. 5FParaglobivalvulina mira•Fig. 5G–HRetroseptellina decrouezae•Fig. 5IDagmarita chanakchiensis•Fig. 5J–LHemigordius schlumbergeri•Fig. 5MCornuspira kinkelini•Fig. 5NCornuspira sp.•Fig. 5OCalcivertella sp.•Fig. 5PGeinitzina sp.•Fig. 5QNodosinelloides camerata•Fig. 5RPachyphloia sp.•Fig. 5SLangella sp.•Fig. 5TRobuloides lens•Fig. 5URectostipulina quadrata•Fig. 5V–WRectostipulina hexamerata•Fig. 5XKamurana bronnimanni•Fig. 6A–BGlobidiscus flexus•Fig. 6C–DGlobidiscus fragilis•Fig. 6E–GBaisalina akasakensis••Fig. 6H–LBaisalina sp.•Fig. 6MAgathammina sp.••Fig. 6N–ONeodiscus sp.•Fig. 6P–RMidiella broennimanni•Fig. 6S–TMidiella irregulariformis•Fig. 6URectogordius sp.•Fig. 6VMultidiscella langei•Fig. 6WMultidiscella zaninettiae•Fig. 6XHemigordiopsis luquensis•Fig. 6Y–ZHemigordiopsis renzi•Fig. 6AA–ABGlomomidiella sp.•Fig. 6ACRectogordiopsis kamuranaeformis gen. et sp. nov.••Fig. 3Rectogordiopsis ovaliformis gen. et sp. nov.••Fig. 7Davanella ankaraensis gen. et sp. nov.•Fig. 8A–GDavanella acuminata gen. et sp. nov.•Fig. 8H–LKaganella tekini gen. et sp. nov.••Fig. 8M–ROther Fig. 3 in Systematic Revision and Phylogenetic Assessment of the Family Neodiscidae (Foraminifera) and New Capitanian Foraminiferal Genera from the Ankara Region, Central Türkiye(2026) Akbaş, Melikan; Okuyucu, CengızFig. 3. Microphotographs of the Rectogordiopsis kamuranaeformis gen. et sp. nov. A–B. Holotype, KTÜN.CO–KDY1.2–36. A. Axial section. B. Detail view of the inner volutions, showing the proloculus. C–M. Paratypes. C. Axial section, KTÜN.CO–KDY2.4–24. D. Axial section, KTÜN.CO–KDY1.5–48. E. Transverse section, KTÜN.CO–KDY1.3–29. F. Axial section, KTÜN.CO–KDY1.7–27. G. Transverse section, KTÜN.CO–KDY1.2–3. H. Subaxial section, KTÜN.CO–KDY2.2–24. I. Axial section, KTÜN. CO–KDY2.4–10. J. Subaxial section, KTÜN.CO–KDY1.7–15. K. Axial section, KTÜN.CO–KDY2.1– 14. L. Axial section, KTÜN.CO–KDY2.4–11. M. Subaxial section, KTÜN.CO–KDY1.2–35. Scale bars: A, C–M = 1 mm; B = 0.25 mm.Article Rectogordiopsis kamuranaeformis Okuyucu & Akbaş, 2026, gen. et sp. nov.(2026) Akbaş, Melikan; Okuyucu, CengızRectogordiopsis kamuranaeformis gen. et sp. nov. urn:lsid:zoobank.org:act: E13B6453-85E7-4A7B-AAF0-A323C865B17F Fig. 3 Kamurana bronnimanni – Altiner & Zaninetti, 1977: 2, pl. 1 figs 3–4. Hemigordiopsis renzi – Gargouri & Vachard 1988: 60–61, pl. 1 fig. 7. Diagnosis Large globular Rectogordiopsis gen. nov. with rounded periphery. Etymology Referring to its morphology relatively similar to Kamurana. Material examined Fifty specimens were observed. 1 holotype and 11 paratypes are illustrated. Holotype (Fig. 3A–B) TÜRKİYE – Ankara • SE of Kutludüğün village, Kutludüğün Yayla, sample KDY–1; 39°52′11.0″ N, 33°05′51.4″ E; 20 Jun. 2023; Okuyucu and Akbaş leg.; KTÜN.CO– KDY1, KDY1.2–36. Paratypes (Fig. 3C–M) TÜRKİYE – Ankara • 6 specs; same data as for holotype; KTÜN.CO– KDY1, KDY1.2–3, KDY1.2– 35, KDY1.3–29, KDY1.5–48, KDY1.7–15, KDY1.7–27 • 5 specs; same data as for holotype, sample KDY–2; 39°52′07.4″ N, 33°06′23.4″ E; KTÜN.CO– KDY2, KDY2.1–14, KDY2.2–24, KDY2.4–10, KDY2.4–11, KDY2.4–24. Description Test large to very large, involute, globular with rounded periphery. Coiling initially glomospiral and finally planispiral. Spherical proloculus, 0.087 –0.100 mm in diameter, followed by second chamber slowly enlarging in height through whorls. Initial part consists of at least 15–17 whorls, thin-walled and tightly coiled. In the terminal part (5–8 whorls) the height of the chamber increases gradually. Adult specimens measure: D = 2.08–3.25, w = 1.88–3.00 mm, the ratio w/D = 0.74–1.04, n.w. = 20–25. Wall calcareous, porcelaneous with perforations (comb teeth-shaped). The lumen of the tube is relatively high with frequent flosculinisation in adult stage. Aperture simple, terminal.ForaminifersSampleIllustrationsKDY –1KDY–2–1KDY–2Neoschwagerina craticulifera• Fig. 4A–BNeoschwagerina pinguis• Fig. 4CNeoschwagerinasp. • Fig. 4DYabeinasp. • Fig. 4EChusenella tieni• Fig. 4FPostkwantoella goekcehueyuekensis• Fig. 4GLeella armenica• Fig. 4H–ICodonofusiellasp. • Fig. 4JKahlerinasp. • Fig. 4KNankinella orientalis• • Fig. 4L–MNankinella acuta• • Fig. 4N–ONankinellaaff.chongyangensis• Fig. 4PNankinellasp. • Fig. 4QReichelinasp. • Fig. 4R–SGlobivalvulina vonderschmitti• Fig. 5AGlobivalvulina cyprica• Fig. 5B–CCharliella rossae• • Fig. 5D–ESengoerina argandi• Fig. 5FParaglobivalvulina mira• Fig. 5G–HRetroseptellina decrouezae• Fig. 5IDagmarita chanakchiensis• Fig. 5J–LHemigordius schlumbergeri• Fig. 5MCornuspira kinkelini• Fig. 5NCornuspirasp. • Fig. 5OCalcivertellasp. • Fig. 5PGeinitzinasp. • Fig. 5QNodosinelloides camerata• Fig. 5RPachyphloiasp. • Fig. 5SLangellasp. • Fig. 5TRobuloides lens• Fig. 5URectostipulina quadrata• Fig. 5V–WRectostipulina hexamerata• Fig. 5XKamurana bronnimanni• Fig. 6A–BGlobidiscus flexus• Fig. 6C–DGlobidiscus fragilis• Fig. 6E–GBaisalina akasakensis• • Fig. 6H–LBaisalinasp. • Fig. 6M Comparison Rectogordiopsis kamuranaeformis gen. et sp. nov. differs from K a murana bronnimanni by the planispiral involute coiling without any oscillation. Microfossil association The associated foraminiferal fauna is listed in Table 1 and illustrated in Figs 4–6. Range and distribution Middle Permian (late Capitanian) of the Elmadağ Olistostrome, Ankara City, Central Türkiye.Article Agathammininae Ciarapica, Cirilli & Zaninetti 1987(2026) Akbaş, Melikan; Okuyucu, CengızSubfamily Agathammininae Ciarapica, Cirilli & Zaninetti, 1987 emend. herein Septagathammininae Mikhalevich, 1988: 88. Description (emended) Medium-sized miliolid with spherical proloculus followed by a tubular chamber, initially quinqueloculinoid then planispiral involute, sometimes with evolute last whorls. The tubular chamber sometimes shows pseudosepta. Porcelanaceous wall with perforations similar to comb teeth-shaped structure. Aperture terminal, simple. Included genera Agathammina Neumayr, 1887; Septagathammina Lin, 1984.Article Kaganella tekini Okuyucu & Akbaş, 2026, gen. et sp. nov.(2026) Akbaş, Melikan; Okuyucu, CengızKaganella tekini gen. et sp. nov. urn:lsid:zoobank.org:act: ABA3BE39-4E76-47C5-9AA9-A6D380B32B51 Fig. 8M–R Diagnosis Moderate to large rounded Kaganella gen. nov. with slightly pointed periphery. Etymology This species is named after Professor Dr U. Kagan Tekin (Hacettepe University, Ankara, Türkiye), in honour of his contributions to the knowledge of Radiolarian biostratigraphy. Material examined Five specimens were observed. 1 holotype and 4 paratypes are illustrated. Holotype (Fig. 8M–N) TÜRKİYE – Ankara • SE of Kutludüğün village, Kutludüğün Yayla, sample KDY–2; 39°52′07.4″ N, 33°06′23.4″ E; 20 Jun. 2023; Okuyucu and Akbaş leg.; KTÜN.CO–KDY2, KDY2.2–2. Paratypes (Fig. 8O–R) TÜRKİYE – Ankara • 1 spec.; same data as for holotype; KTÜN.CO–KDY2, KDY2.2–35 • 3 specs; same data as for holotype, sample KDY–1; 39°52′11.0″ N, 33°05′51.4″ E; KTÜN.CO–KDY1, KDY1.2– 27, KDY1.2–40, KDY1.3–35. Description Test moderate to large, involute, globular with slightly pointed periphery. Coiling at the beginning tightly glomospiral and finally planispiral. Spherical proloculus, 0.06–0.10 mm in diameter, followed by second chamber slowly enlarging in height through successive whorls. Initial part consists of approximately 23–25 whorls with relatively thin-walled. In the terminal part (planispiral coiled 3–4 whorls) the height of the whorls increases gradually. Adult specimens measure: D = 1.23–2.38 mm, w = 0.9–1.25 mm, the ratio w/D = 0.64–0.87, n.w. = 26–29. Wall calcareous, porcelaneous with some neosparitizations mainly in last whorls. The lumen of the tube is relatively narrow with rare flosculinisations. Aperture simple, terminal. Comparison Kaganella tekini gen. et sp. nov. differs from Rectogordiopsis kamuranaeformis gen. et sp. nov. by the smaller size of the test and rare perforations (comb teeth-shaped) in neosparitized wall which observed mainly in last whorls. Microfossil association The associated foraminiferal fauna is listed in Table 1 and illustrated in Figs 4–6. Range and distribution Middle Permian (late Capitanian) of the Elmadağ Olistostrome, Ankara City, Central Türkiye.Article Evolutionary Trend of Profusulinellid Genera in Bashkirian-Moscovian Carbonates of the Hadim Nappe, Southern Turkey(2022) Okuyucu, Cengiz; Akbaş, MelikanThe Hadim Nappe which is one of the allochthonous tectonic units in the Tauride Belt includes continuous stratigraphic successions from Middle(?)-Late Devonian to Late Cretaceous. The well exposed successions of the Moscovian to lower Kasimovian are selected for fusulinid biostratigraphy along three sections (Yassıpınar, Gölbelen and Bademli) in the Central Taurides. The Lower-Middle Pennsylvanian boundary was determined by the first appearance datum of the Aljutovella aljutovica (Rauzer-Chernousova, 1938) and Solovievaia ovata ovata (Rauzer-Chernousova, 1938). In this study, the Vereian, Kashirian, Podolskian and Myachkovian regional substages of the Moscovian stage were determined by Aljutovella aljutovica-Solovievaia ovata ovata, Aljutovella priscoidea (Rauzer-Chernousova, 1938), Eofusulina triangula (Rauzer-Chernousova & Belyaev in Rauzer-Chernousova, Belyaev & Reitlinger, 1936), Fusulinella vozhgalensis devexa Rauzer-Chernousova in Rauzer-Chernousova, Gryzlova, Kireeva, Leontovich, Safonova & Chernova, 1951, Beedeina schellwieni (Staff in Schellwien & Staff, 1912) and Fusulinella bocki bocki Möller, 1878 in ascending order. The base of the lower Kasimovian is represented by the occurrence of Quasifusulinoides Rauzer-Chernousova & Rozovskaya in Rauzer-Chernousova & Fursenko, 1959, Protriticites Putrya, 1948 and Montiparus Rozovskaya, 1948 taxa. A total of 106 fusulinid species belonging to 19 genera were determined. One genus and ten species are new: Aljutovella typica Akbaş, n. sp., Beedeina minuta Akbaş, n. sp., Beedeina tauridiana Akbaş, n. sp., Praefusulinella guvenci Akbaş, n. gen., n. sp., Praefusulinella okuyucui Akbaş, n. gen., n. sp., Praefusulinella rhombiforma Akbaş, n. gen., n. sp., Praefusulinella tekini Akbaş, n. gen., n. sp., Fusulinella absoluta Akbaş, n. sp., Fusulinella obtusa minuta Akbaş, n. subsp. and Fusulinella propriaforma Akbaş, n. sp. The taxonomic positions of some fusulinids species (e.g., Neostaffella larionovae polasnensis (Rauzer-Chernousova & Safonova in Rauzer-Chernousova, Gryzlova, Kireeva, Leontovich, Safonova & Chernova, 1951), Depratina chernovi (Rauzer-Chernousova, Gryzlova, Kireeva, Leontovich, Safonova & Chernova, 1951), Solovievaia arta (Leontovich in Rauzer-Chernousova, Gryzlova, Kireeva, Leontovich, Safonova & Chernova, 1951) and Beedeina paradistenta (Safonova in Rauzer-Chernousova, Gryzlova, Kireeva, Leontovich, Safonova & Chernova, 1951) were revised. The fusulinid assemblages recovered in this study correlate well with the Russian Platform, Cantabrian Mountains, Central Iran, southern Urals, Donets Basin, and some other regions of the Tethyan Realm.Article New Data on the Early-Middle Viséan (mfz10-Mfz13) Foraminifers From the Hadim Nappe, Southern Turkey: Biostratigraphic Implications(Micro Press, 2024) Akbaş, MelikanThe Hadim Nappe has a relatively complete succession from the Middle(?)-Upper Devonian to Upper Cretaceous in the Taurides. The Bademli section is one of the well exposed sections of the Hadim Nappe that is selected for detailed biostratigraphic investigations. It includes a continuous Vis & eacute;an stratigraphic succession. In the Bademli section, rich and diverse Early-Middle Vis & eacute;an foraminiferal assemblages were recovered, most of which were reported for the first time in Turkey. Four first occurrence biozones, which approximately correspond to the Zones MFZ10 to MFZ13 of the Belgium stratotype section, are identified based on the foraminiferal analysis of the Lower-Middle Visean strata of the Bademli section that are Ammarchaediscus-Glomodiscus first occurrence zone, Uralodiscus rotundus first occurrence zone, Pojarkovella first occurrence zone and Endothyranopsis (Reitlingeropsis) intermedia - Endothyranopsis mosquensis first occurrence zone.Article Davanella ankaraensis Okuyucu & Akbaş, 2026, gen. et sp. nov.(2026) Akbaş, Melikan; Okuyucu, CengızDavanella ankaraensis gen. et sp. nov. urn:lsid:zoobank.org:act: 32686C24-35E1-49BD-9162-7204E5E84947 Fig. 8A–G Diagnosis Very large globular to ovoid Davanella gen. nov. with rounded periphery. Etymology Latin, from Ankara, the capital of Türkiye. Material examined Eight specimens were observed. 1 holotype and 5 paratypes are illustrated. Holotype (Fig. 8E) TÜRKİYE – Ankara • SE of Kutludüğün village, Kutludüğün Yayla, sample KDY–1; 39°52′11.0″ N, 33°05′51.4″ E; 20 Jun. 2023; Okuyucu and Akbaş leg.; KTÜN.CO– KDY1, KDY1.1–16. Paratypes (Fig. 8A–D, G) TÜRKİYE – Ankara • 5 specs; same data as for holotype; KTÜN.CO–KDY1, KDY1.2–2, KDY1.3–53, KDY1.8–4, KDY1.8–19, KDY1.8–25. Description Test large to very large, involute, globular to ovoid with rounded periphery. A central depression or umbilicus well-developed in axial section. Spherical proloculus, measuring 0.07–0.09 mm in outside diameter, followed by second tubular chamber. Initial part consists of approximately 12–15 loosely coiled glomospiroid whorls. In all subsequent whorls the height of the chamber increases rapidly. Adult specimens measure: D = 2.13–3.43 mm, w = 1.90–2.38 mm, the ratio w/D = 0.67–0.89, n.w. = 15–19. Wall thick, calcareous porcelaneous with perforations (comb teeth-shaped). A weak flosculinisation developed in adult stage. Aperture simple, terminal. Comparison Davanella ankaraensis gen. et sp. nov. differs from the species of the Rectogordiopsis gen. nov. by the presence of umbilicus. Microfossil association The associated foraminiferal fauna is listed in Table 1 and illustrated in Figs 4–6. Range and distribution Middle Permian (late Capitanian) of the Elmadağ Olistostrome, Ankara City, Central Türkiye.Publication Article Agathammina Neumayr 1987(2026) Akbaş, Melikan; Okuyucu, CengızGenus Agathammina Neumayr, 1887 emend. Wolanska 1959, emended herein Type species Agathammina pusilla (Geinitz, 1848) (type by subsequent designation). Description (emended) Test ovate, globular proloculus followed by enrolled undivided tubular second chamber of few gradually enlarging whorls, initially quinqueloculinoid then planispiral involute sometimes with evolute last whorls without septation; wall calcareous, porcelaneous with perforations similar to comb teeth-shaped structure. Aperture terminal, simple.
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| Affiliation Name | Count |
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| Konya Technical University | 65 |
| Ankara Hacı Bayram Veli University | 57 |
| Middle East Technical University | 3 |
| Hacettepe University | 2 |
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| Open MIND | 16 |
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