Kirkigraptus, a new retiolitid graptolite from Poland

• Autorzy: Kozlowska A , Bates D.E.B.
• Języki publikacji: EN

Abstrakty

EN

The new retiolitid graptolite Kirkigraptus inexpectans gen. et sp. nov., from the Neodiversograptus nilssoni Biozone of the Bartoszyce borehole, Poland is described. It is unique among the retiolitids not having a preserved virgella or ancora. Instead the most proximal structures are two round proxi−lateral lists, joining the two genicular lists of the first thecae, connecting the two sides of the rhabdosome. The lists are interpreted as a possible homologue of the distal edge of the ancora umbrella in typical retiolitids. The size of rhabdosome with large proximal lateral orifices, and the ventral panels of thecae with mid−ventral lists, are similar to those of Plectograptus, whereas the two ancora sleeve panels consisting of spaced horizontal lists only, resemble those of Valentinagraptus. It is possible that the new retiolitid may represent a new pattern of development of the proximal end of the rhabdosome, different from that in all other retiolitids.

Słowa kluczowe

EN

deposit; Poland; systematics; paleontology; Silurian; Kirkigraptus inexpectans; retiolitid skeleton; Retiolitidae; graptolite; Graptolithina; retiolitid graptolite; new species; new aspect; East European Platform; evolution

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2008
• Tom: 53
• Numer: 1
• Opis fizyczny: p.105-112,fig.,ref.

Twórcy

autor

Kozlowska A

• Polish Academy of Sciences, Twarda 51/55, 00-818 Warsaw, Poland

autor

Bates D.E.B.

Bibliografia

• Barrande, J. 1850. Graptolites du Bohême. 74 pp. Théophile Hasse Fils, Prague.
• Bates, D.E.B. 1990. Retiolite nomenclature and relationships. Journal of the Geological Society 147: 717–723.
• Bates, D.E.B. and Kirk, N.H. 1984. Autecology of Silurian graptoloids. Special Paper in Palaeontology 32: 121–139.
• Bates, D.E.B. and Kirk, N.H. 1992. The ultrastructure, mode of construction and functioning of a number of Llandovery ancorate diplograptid and retiolitid graptolites. Modern Geology 17: 1–270.
• Bates, D.E.B. and Kirk, N.H. 1997. The ultrastructure, mode of construction and functioning of the genera Stomatograptus and Retiolites, with an appendix on the incremental construction of the rhabdosome of Petalolithus, and its comparison with that of the thecal framework in Retiolites and Stomatograptus. Institute of Geography and Earth Sciences, University of Wales, Aberystwyth 10: 1–168.
• Bates, D.E.B., Kozłowska, A., and Lenz, A.C. 2005. Silurian retiolitid graptolites: morphology and evolution. Acta Palaeontologica Polonica 50: 705–720.
• Bates, D.E.B., Kozłowska, A., Maletz, J., Kirk, N.H., and Lenz, A.C. 2006. The Silurian retiolitid graptolite Plectograptus: New observations and new species. Acta Palaeontologica Polonica 51: 525–540.
• Bouček, B. and Münch, A. 1952. Retioliti středoevropského svrchního wenloku a ludlowu. Sborník Ústředního Ústavu geologického, oddil paleontologicky 19: 1–151.
• Eisenack, A. 1951. Retioliten aus dem Graptolithengestein. Palaeontographica 100: 129–163.
• Kozłowska−Dawidziuk, A. 1995. Silurian retiolitids of the East European Platform. Acta Palaeontologica Polonica 40: 261–326.
• Kozłowska−Dawidziuk, A. 1997. Retiolitid graptolite Spinograptus from Poland and its membrane structures. Acta Palaeontologica Polonica 42: 391–412.
• Kozłowska−Dawidziuk, A. and Lenz, A.C. 2001. Evolutionary development in the Silurian Retiolitidae (Graptolites). Journal of the Czech Geological Society 46: 227–238.
• Kozłowska−Dawidziuk, A. 2002. Agastograptus, a synonym of Plectograptus (Retiolitidae, Graptolithina). Acta Palaeontologica Polonica 47: 459–467.
• Kozłowska−Dawidziuk, A. 2004. Evolution of retiolitid graptolites—a synopsis. Acta Palaeontologica Polonica 49: 505–518.
• Lapworth, C. 1873. On an improved classification of the Rhabdophora. Geological Magazine 10: 500–504, 555–560.
• Lapworth, C. 1876. On Scottish Monograptidae. Geological Magazine 13: 544–552.
• Lapworth, C. 1877. On the graptolites of County Down. Proceedings of the Belfast Naturalists Field Club 1: 107–147.
• Lenz, A.C. 1994. A sclerotized retiolitid, and its bearing on origin and evolution of Silurian retiolitid graptolites. Journal of Paleontology 68: 1344–1349.
• Lenz, A.C. 1995. Upper Homerian (Wenlock, Silurian) graptolites and graptolite biostratigraphy, Arctic Archipelago, Canada. Canadian Journal of Earth Sciences 32: 1378–1392.
• Lenz, A.C. and Kozłowska, A. 2006: Graptolites from the lundgreni Biozone (lower Homerian, Silurian), Arctic Islands, Canada: new species and supplementary material. Journal of Paleontology 80: 616–637.
• Lenz, A.C. and Kozłowska−Dawidziuk, A. 2001. Upper Wenlock (Silurian) graptolites of Arctic Canada: pre−extinction, lundgreni Biozone fauna. Palaeontographica Canadiana 20: 1–61.
• Lenz, A.C. and Kozłowska−Dawidziuk, A. 2002. Late Wenlock and early Ludlow graptolite extinction, evolution and diversification. Special Papers in Paleontology (C.H. Holland commemorative volume) 67: 171–183.
• Lenz, A.C. and Kozłowska−Dawidziuk, A. 2004. Ludlow and Přidoli (Upper Silurian) Graptolites from the Arctic Islands, Canada. 141 pp. NRC Research Press, Ottawa, Ontario.
• Manck, E. 1917. Die Graptolithen der Zone 18, sowie Retiolites eiseli sp. nov. Zeitschrift für Naturwissenschaft 86: 337–344.
• Maletz, J., Königshof, P., Meco, S., and Schindler, E. 1998. Late Wenlock to Early Ludlow graptolites from Albania. Senckenbergiana Lethaea 78: 141–151.
• Moberg, J.C. and Törnquist, S.L. 1909. Retiolitoidea från Skånes Colonusskiffer. Sveriges Geologiska Undersökning C 213: 1–20.
• Murchison, R.I. 1839. The Silurian System, Founded on Researches in the Countries of Scalop, Hereford, Montgomery, Carmarthen, Brecon, Pembroke, Monmouth, Glucester, Worcester, and Stafford: with Description of the Coal−Fields and Overlaying Formation. xx+523 pp. John Murray, London.
• Obut, A.M. and Zaslavskaya, N. 1983. Families of retiolitids and their phylogenetic relationships [in Russian]. In: A.S. Dagys and V.N. Dubatolov (eds.), Morfologiâ i sistematika bespozvonočnyh fanerozoâ, 103–113. Izdatelstvo Nauka, Moskva.
• Piras, S. 2006. Valentinagraptus a new genus of plectograptid graptoloid from the lower Ludlow (Silurian) of Barrandian, Bohemia. Geological Journal 41: 581–590.
• Suess, E. 1851. Über böhmische Graptolithen. Naturwissenschaftliche Abhandlungen 4: 87–134.
• Zalasiewicz, J. and Tunnicliff, S. 1994. Uppermost Ordovician graptolite biostratigraphy of the Wye Valley, central Wales. Palaeontology 37: 695–720.