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Silurian Leptaeninae (Brachiopoda) of Gotland, Sweden
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
2005 (English)In: Paläontologishe Zeitschrift, ISSN 0031-0220 EISSN 1236-9874, Vol. 79, no 2, 263-284 p.Article in journal (Refereed) Published
Abstract [en]

Strophomenid brachiopods belonging to the generaLeptaena andLepidoleptaena are described from the uppermost Llandovery — Ludlow succession of Gotland, Sweden. In Gotland,Lepidoleptaena comprises the single speciesL. poulseni, andLeptaena includes four species:L. rhomboidalis, L. sperion, L. depressa andL. parvirugata n. sp.L. depressa shows a considerable amount of morphological variation, which is recognised in the two new subspeciesLeptaena depressa visbyensis n. ssp. from the Llandoverian — Wenlockian Visby Formation, andL. depressa lata n. ssp. from the mid-Wenlockian Slite Group. The distribution of the different species is largely substrate-dependent, withLeptaena rhomboidalis andLepidoleptaena poulseni adapted to high-energy environments with firm substrates, whereas the remaining species preferred fine-grained substrates in low-energy environments.

Place, publisher, year, edition, pages
2005. Vol. 79, no 2, 263-284 p.
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-92495DOI: 10.1007/BF02990188OAI: oai:DiVA.org:uu-92495DiVA: diva2:165600
Available from: 2005-01-20 Created: 2005-01-20 Last updated: 2013-03-22Bibliographically approved
In thesis
1. Diversity and Life Habits of Silurian Strophomenide Brachiopods of Gotland
Open this publication in new window or tab >>Diversity and Life Habits of Silurian Strophomenide Brachiopods of Gotland
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Siluriska strophomenider (Brachiopoda) från Gotland: artsrikedom och levnadssett
Abstract [en]

The Superfamily Strophomenoidea is a very diverse group of brachiopods in the Early Palaeozoic. In the Silurian succession on Gotland, they are among the most easily identifiable, and commonly found fossils. However, there are few detailed studies of this group from Gotland, and no new strophomenide taxa have been described from this area since 1869. The life habits of strophomenides are also poorly understood, partly because their morphology differs greatly from that of living brachiopods.

The succession on Gotland yielded 27 species belonging to the Strophomenoidea, of which two species and two subspecies are new. The remaining species have been described earlier from Gotland or Great Britain. The most important group is the Leptaeninae, which occurs commonly throughout the entire succession on Gotland. Five species (one new), two new subspecies and two taxa treated under open nomenclature were found. Leptaena rhomboidalis and Lepidoleptaena poulseni were specialized for life in shallow water environments, retaining a large apical pedicle; the remaining leptaenines were ambitopic. The Furcitellininae is represented by three genera comprising six species, of which only one persisted into the Ludlow. All were ambitopic, except Pentlandina loveni, which was specialized for high-energy environments. Six species of “strophodontids” from Gotland, belonging to the Leptostrophidae, the Strophodontidae and the Shaleriidae, share a shallow-bodied, variably concavo-convex shell with costellate ornament. Mesoleptostrophia and Brachyprion (Brachyprion) were long-ranged and ecologically tolerant, while B. (Erinostrophia), Strophodonta and Shaleria had short ranges and were ecologically specialized. The two earliest known cementing strophomenides occur on Gotland, and their hitherto unknown dorsal valves have been identified: Liljevallia was found to belong to the Douvillinidae. The cementing Leptaenoidea silurica was found to be conspecific with the ambitopic Scamnomena rugata; it was able to live ambitopically if removed from the substrate. The thickened dorsal valves allow reconstruction of its lophophore.

Place, publisher, year, edition, pages
Uppsala: Institutionen för geovetenskaper, 2005. 47 p.
Earth sciences, Gotland, Silurian, brachiopod, functional morphology, ecology, Llandovery, Wenlock, Ludlow, Strophomenoidea, Geovetenskap
National Category
Earth and Related Environmental Sciences
urn:nbn:se:uu:diva-4728 (URN)91-506-1789-3 (ISBN)
Public defence
2005-02-11, Lecture Theatre, Paleontology building, Nordbyvägen 22, Uppsala, 10:00
Available from: 2005-01-20 Created: 2005-01-20Bibliographically approved

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