The radiation of early Silurian spiriferide brachiopods, with new taxa from the Llandovery of Iran
2013; Taylor & Francis; Volume: 37; Issue: 4 Linguagem: Inglês
10.1080/03115518.2013.828254
ISSN1752-0754
Autores Tópico(s)Marine Biology and Ecology Research
ResumoAbstractPopov, L.E. & Cocks, L.R.M., 2013. The radiation of early Silurian spiriferide brachiopods, with new taxa from the Llandovery of Iran. Alcheringa 38, 560–566. ISSN 0311–5518.Although there were Late Ordovician spiriferides in the superfamily Cyrtioidea, namely Eospirifer and Odakella, only the former genus survived the terminal Ordovician extinction, and only Eospirifer is known from the earliest Llandovery (Rhuddanian). However, in the succeeding mid-Llandovery (Aeronian), the spiriferides radiated to include not only more species within Eospirifer and Striispirifer in the Eospiriferidae, but also the new genus Iranospirifer described here, which is the earliest representative of the other family within the superfamily, the Hedeinopsidae. The Ordovician species were confined to the South China continent and the Boshchekul volcanic island arc in Kazakhstan, but by the Aeronian the superfamily had spread westwards to various other continents, including the main Gondwanan superterrane (which included Iran) in the early Aeronian, and Avalonia-Baltica and Laurentia in the late Aeronian. The new species Eospirifer ghobadiae and Iranospirifer qarabilensis are both described from the lower Aeronian of Iran, and there is a note on the Aeronian rhynchonellide Stegocornu, which is endemic to Iran and nearby areas.Leonid E. Popov [lepbarry@yahoo.co.uk; leonid.popov@museumwales.ac.uk] Department of Geology, National Museum of Wales, Cathays Park, Cardiff CF10 3NP, UK. L. Robin M. Cocks [r.cocks@nhm.ac.uk], Department of Earth Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD, UK. Received 29.5.2013, revised 12.7.2013, accepted 21.7.2013.志留纪早期石燕类腕足动物的放射作用: 伊朗Llandovery新动物群虽然Cyrtioidea超科包含晚奥陶世石燕类Eospirifer 和Odakella, 仅前一个属经受住了奥陶纪绝灭事件, 也是唯一的Llandovery (Rhuddanian) 已知属。然而, 在随后的Llandovery中期 (Aeronian), 石燕类放射发展, 不仅包括更多的Eospirifer种和Eospiriferidae科的Striispirifer, 而且包括本文描述的新属Iranospirifer。这是该超科中的另一科Hedeinopsidae的最早代表分子。奥陶纪种限于华南大陆和哈萨克Boshchekul火山岛弧; 然而, 到Aeronian阶时, 该超科已经向西扩展至其它若干大陆, 包括Aeronian阶早期的主要冈瓦纳超地体 (包括伊朗) 和Aeronian阶晚期的Avalonia-Baltica和Laurentia。两个新种Eospirifer ghobadiae 和 Iranospirifer garabilensis都来自伊朗Aeronian阶地层下部。Aeronian阶的rhynchonellide是伊朗和其附近地区的土著分子。Key words: BrachiopodaSpiriferidaSilurianLlandoveryAeronianbiogeographyIran AcknowledgementsWe are very grateful to Mansoureh Ghobadi Pour, Golestan University, Gorgan, for geological data and brachiopod specimens from the Saluk Mountains, and to Rong Jiayu, Nanjing and Denise Brice, Lille, for discussion and information. Thanks to the National Museum of Wales for logistical support (LEP) and Christian Baars for SEM photography; and to the Natural History Museum for facilities (LRMC) and Phil Crabb for some of the photographs. The paper has benefitted from constructive comments by Zhan Renbin and Mena Schemm-Gregory.
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