Megaspores from the Late Triassic‒Early Jurassic of southern Scandinavia: taxonomic and biostratigraphic implications

Figures & data

Figure 1. Geological map of Skåne (southern Sweden) with studied localities, modified after Kruger et al. (2021, this issue). 1. Åbro BH-207/64 and Billesholm. 2. Hyllinge. 3. Textile Factory, Eslöv. 4. Höllviken II. 5. Stabbarp BH-74. 6. Helsingborg harbour. 7. Svedala I. 8. Kävlinge BH-928

Figure 2. Early Mesozoic megaspore assemblages recorded in this study from Skåne (Sweden) and Bornholm (Denmark). G. Galgeløkke Member

Figure 3. Stratigraphical occurrences of Triassic and Jurassic megaspores recorded in Skåne and Bornholm

Figure 4. Trileites and Banksisporites. Scale bars = 100 μm. A, B. Trileites grandis Fuglewicz, 1973. A. Proximal view, SEM, S054719-02-01. B. Proximal view, SEM, S054353-03. C–F. Banksisporites dettmanniae Banerji, Kumaran et Maheshwari 1978. C. Proximal view, transmitted light, S079701, R36. D. Proximal view, transmitted light, overexposure, S079701, R36. E. Proximal view, fluorescence, S079701, R36. F. Distal view, fluorescence, S079701, R36

Figure 5. Banksisporites. Scale bars = 100 μm. A–F. Banksisporites pinguis (Harris, 1935) Dettmann, 1961. A. Proximal view, transmitted light, S054802-01-03, R40-2. B. Proximal view, fluorescence, S054802-01-03, R40-2. C. Megaspore tetrad, transmitted light, S064827-02-01, F31-2. D. Megaspore tetrad, fluorescence, S064827-02-01, F31-2. E. Lateral view, transmitted light, S054802-01-04, P38-3. F. Lateral view, fluorescence, S054802-01-04, P38-3. G–H. Banksisporites sinuosus Dettmann, 1961. G. Proximal view, transmitted light, S054802-05-01, R37. H. Proximal view, fluorescence, S054802-05-01, R37. I–L. Banksisporites dejerseyi Scott et Playford, 1985. I. Oblique view, transmitted light, S064850-02-01, P29-1. J. Oblique view, fluorescence, S064850-02-01, P29-1. K. Proximal view, transmitted light, S054802-05-01, R37. L. Proximal view, fluorescence, S054802-05-01, R37

Figure 6. Pusulosporites populosus Fuglewicz, 1973. Scale bars = 100 μm. A. Distal view, transmitted light, S079726, O53-2. B. Distal view, fluorescence, S079726, O53-2. C. Proximal view, transmitted light, S079727, M43. D. Proximal view, fluorescence, S079727, M43. E. Proximal view, transmitted light, S079716, L37. F. Proximal view, fluorescence, S079716, L37

Figure 7. Bacutriletes tylotus (Harris, 1935) Potonié, 1956. Scale bars = 100 μm. A. Proximal view, transmitted light, S079701, R37-1. B. Proximal view, fluorescence, S079701, R37-1. C. Lateral view, transmitted light, S079701, V38. D. Lateral view, fluorescence, S079701, V38. E. Distal view, transmitted light, S079701, J37-2. F. Distal view, fluorescence, S079701, J37-2

Figure 8. Narkisporites, Bacutriletes and Horstisporites. Scale bars = 100 μm, or indicated otherwise. A, B. Narkisporites sp. A. Lateral view, SEM, Kävlinge BH-928, 42.25–41.15 m. B. Enlargement, SEM, showing blunt and spiny projections outside the contact area, Kävlinge BH-928 42.25–41.15 m. Scale bar = 50 μm. C, D. Bacutriletes sp. cf. B. asaphus Fuglewicz, 1973. C. Proximal view, SEM, Kävlinge BH-928, 46.91–46.07 m. D. Enlargement, SEM, Kävlinge BH-928, 46.91–46.07 m. Scale bar = 50 μm. E, F. Horstisporites sp. cf. H. microlumenus Dettmann, 1961. E. Proximal view, SEM, Kävlinge BH-928, 46.91–46.07 m. F. Enlargement, SEM, Kävlinge BH-928, 46.91–46.07 m. Scale bar = 50 μm

Figure 9. Bacutriletes. Scale bars = 100 μm. A–F, I, L. Bacutriletes? sp. A. Oblique view, transmitted light, S066549, R26. B. Oblique view, transmitted light, over-exposure, S066549, R26. C. Oblique view, fluorescence, S066549, R26. D. Proximal view, transmitted light, S063493-02, N42-4. E. Proximal view, fluorescence, S063493-02, N42-4. F. Enlargement of C, fluorescence, S066549, R26. I. Enlargement of C, fluorescence, S066549, R26. L. Distal view of a broken specimen, fluorescence, S063493-01, N42-4. G, H. Bacutriletes sp. cf. B. srivastavae Banerji, Jana et Maheshwari 1984. G. Lateral view, transmitted light, S063489, M44-4. H. Lateral view, fluorescence, S063489, M44-4. J, K. Bacutriletessp. cf. B. onodios (Harris, 1961) Hopkins et Sweet, 1976. J. Proximal view, fluorescence, S079718-01, P40-3. K. Distal view, fluorescence, S079718-01, P40-3

Figure 10. Horstisporites. Scale bars = 100 μm, or indicated otherwise. A–D. Horstisporites planatus (Marcinkiewicz, 1960) Marcinkiewicz, 1971. A. Proximal view, SEM, Kävlinge BH-928, 34.75–33.75 m. B. Enlargement, SEM, showing the micro-reticulation in the surface reticulation, Kävlinge BH-928, 34.75–33.75 m. Scale bar = 20 μm. C. Proximal view, SEM, Kävlinge BH-928, 34.75–33.75 m. D. Enlargement, SEM, showing the micro-reticulation in the surface reticulation, Kävlinge BH-928, 34.75–33.75 m. Scale bar = 10 μm. E, F. Horstisporites sp. E. Oblique view, SEM, Kävlinge BH-928, 41.15–40.40. F. Enlargement, SEM, Kävlinge BH-928, 41.15–40.40. Scale bar = 50 μm

Figure 11. Horstisporites? sp. cf. H. sulcatus Fuglewicz, 1973. Scale bars = 100 μm. A. Oblique view, transmitted light, S079713, D31-3. B. Oblique view, fluorescence, S079713, D31-3. C. Lateral view, transmitted light, S079725, K34-3. D. Lateral view, fluorescence, S079725, K34-3. E. Distal view, transmitted light, S079701, L32-2. F. Distal view, fluorescence, S079701, L32-2

Figure 12. Paxillitriletes. Scale bars = 100 μm, or indicated otherwise. A, B. Paxillitriletes ales (Harris, 1935) Batten et Koppelhus, 1993. A. Lateral view, transmitted light, S063488, M42-3. B. Lateral view, fluorescence, showing strongly developed capilli near triradiate lamellae, S063488, M42-3. C–F. Paxillitriletes sp. C. Lateral view, SEM, Kävlinge BH-928, 46.91–46.07 m. D. Enlargement, SEM, Kävlinge BH-928, 46.91–46.07 m. Scale bar = 30 μm. E. Enlargement, SEM, Kävlinge BH-928, 46.91–46.07 m. Scale bar = 50 μm. F. Enlargement, SEM, Kävlinge BH-928, 46.91–46.07 m. Scale bar = 50 μm

Figure 13. Nathorstisporites hopliticus Jung, 1958. Scale bars = 100 μm. A. Oblique view, transmitted light, S079741, L41-4. B. Oblique view, fluorescence, S079741, L41-4. C. Enlargement, fluorescence, S079741, L41-4. D. Enlargement, fluorescence, S079741, L41-4. E. Lateral view, transmitted light, S075612, M38-2. F. Lateral view, fluorescence, S075612, M38-2

Figure 14. Nathorstisporites hopliticus Jung, 1958. Scale bars = 100 μm, or indicated otherwise. A. Proximal view, fluorescence, S066557, P36-2. B. Proximal view, SEM, Munkerup. C. Enlargement, SEM, Munkerup. Scale bar = 50 μm. D. Distal view, SEM, Munkerup. E. Enlargement, SEM, Munkerup. Scale bar = 10 μm. F. Enlargement, SEM, Munkerup. Scale bar = 20 μm

Kruger, A., Slater, S.M. & Vajda, V., 2021: 3D imaging shark egg cases (Palaeoxyris) from Sweden, new insights into Early Jurassic shark ecology. GFF. doi:https://doi.org/10.1080/11035897.2021.1907442

 Google Scholar

Fuglewicz, R., 1973: Megaspores of Polish Buntersandstein and their stratigraphical significance. Acta Palaeontologica Polonica 18, 401‒453.

 Google Scholar

Banerji, J., Kumaran, K.P.N. & Maheshwari, H.K., 1978: Upper triassic sporae dispersae from the Tiki formation: megaspores from the Janar Nala Section, South Rewa Gondwana Basin. The Palaeobotanist 25, 1–26.

 Google Scholar

Harris, T.M., 1935: The fossil flora of Scoresby Sound, East Greenland. Part 4: ginkgoales, coniferales, lycopodiales and isolated fructifications. Meddelelser Om Grønland 112, 1–176.

 Google Scholar

Dettmann, M.E., 1961: Lower Mesozoic megaspores from Tasmania and South Australia. Micropaleontology 7, 71‒86. doi:https://doi.org/10.2307/1484144.

 Google Scholar

Scott, A.C. & Playford, G., 1985: Early Triassic megaspores from the Rewan Group, Bowen Basin, Queensland. Alcheringa 9, 297‒323. doi:https://doi.org/10.1080/03115518508618975.

 Google Scholar

Potonié, R., 1956: Synopsis der Gattungen der Sporae dispersae I. Teil: sporites. Beihefte zum Geologischen Jahrbuch 23, 103.

 Google Scholar

Banerji, J., Jana, B.N. & Maheshwari, H.K., 1984: The fossil floras of Kachchh, II—Mesozoic megaspores. The Palaeobotanist 33, 190–227.

 Google Scholar

Harris, T.M., 1961. The Yorkshire Jurassic flora I. Thallophyta‒Pteridophyta, 212. British Museum (Natural History), London.

 Google Scholar

Hopkins, W.S. & Sweet, A.R., 1976: A microflora from a short section of the Paleogene Kishenehn Formation, southeastern British Columbia. Geological Survey of Canada, Paper 76-1B, 307‒309.

 Google Scholar

Marcinkiewicz, T., 1960: Analiza megasporowa osadów jurajskich okolic Gorzowa Śląskiego-Praszki. Kwartalnik Geologiczny 4, 713‒733. (Russian and English summaries).

 Google Scholar

Marcinkiewicz, T., 1971: Stratygrafia retyku i liasu w Polsce na podstawie badań megasporowych. Instytut Geologiczny, Prace 65, 58. (Russian and English summaries).

 Google Scholar

Batten, D.J. & Koppelhus, E.B., 1993: Morphological reassessment of some zonate and coronate megaspore genera of mainly post-Palaeozoic age. Review of Palaeobotany and Palynology 78, 19‒40. doi:https://doi.org/10.1016/0034-6667(93)90015-M.

 Google Scholar

Jung, W., 1958: Zur Biologie und Morphologie einiger disperser Megasporen, vergleichbar mit solchen von Lycostrobus scotti, aus dem Rhät‒Lias Frankens. Geologische Blätter für Nordost-Bayern 8, 114‒130.

 Google Scholar