气候变化领域集成服务门户(CCPortal): Morphological disparity and ontogeny of the endemic heteromorph ammonite genus Aegocrioceras (Early Cretaceous; Hauterivian; NW-Germany)

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DOI	10.1016/j.palaeo.2019.01.020
	Morphological disparity and ontogeny of the endemic heteromorph ammonite genus Aegocrioceras (Early Cretaceous; Hauterivian; NW-Germany)
	Hoffmann R.; Weinkauf M.F.G.; Wiedenroth K.; Goeddertz P.; De Baets K.
发表日期	2019
ISSN	0031-0182
起始页码	1
结束页码	17
卷号	520
英文摘要	Despite the fact that heteromorph ammonites often show a large range of intraspecific variation, that variation has rarely been quantified. Here, we quantify the intraspecific variation and ontogeny of 85 newly collected specimens of the Hauterivian endemic ammonite genus Aegocrioceras. All specimens were collected from concretions in the recently exposed bed 82 in the clay pit Resse in NW Germany (Lower Saxony Basin). Data for the conch morphology (diameter, whorl height, whorl interspace, rib spacing) were collected in 45° steps using the new software CONCH©. The CONCH© software will be made officially available with this publication. All ammonites were a priori identified as A. bicarinatum or A. semicinctum. An assessment of the intra- and interspecific variation as well as the ontogeny of this assemblage demonstrates the presence of just one species, i.e., A. bicarinatum. Comparison with the type material of A. bicarinatum and A. semicinctum reveals a large morphological overlap of different conch parameters and does not support a separation of both forms as distinct species. The analyzed assemblage of A. bicarinatum has a high variation in conch morphology including whorl interspace, umbilical width, and whorl expansion. Furthermore, the changes in intraspecific variation through ontogeny were quantified and the presence or absence of sexual dimorphism within the assemblage is discussed. © 2019 Elsevier B.V.
英文关键词	Aegocrioceras bicarinatum; Aegocrioceras semicinctum; Morphometric measurement software CONCH©; Sexual dimorphism; Systematics
语种	英语
scopus关键词	ammonite; assembly rule; comparative study; Cretaceous; endemic species; fossil; Hauterivian; identification key; interspecific variation; intraspecific variation; morphology; morphometry; ontogeny; sexual dimorphism; software; taxonomy; type specimen; Lower Saxony Basin; North German Basin; Ammonoidea; Heteromorpha
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151036
作者单位	Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, Universitätsstraße 150, Bochum, 44801, Germany; Département des sciences de la Terre, Université de Genève, Rue des Maraîchers 13, Geneva, 1205, Switzerland; Am Hohen Holze, Garbsen, 30823, Germany; Steinmann-Institut für Geologie, Mineralogie und Paläontologie, Rheinische Friedrich-Wilhelms-Universität, Nussallee 8, Bonn, 53115, Germany; Abteilung Paläontologie, GeoZentrum Nordbayern, Friedrich–Alexander Universität Erlangen–Nürnberg, Schlossgarten 5, Erlangen, 91054, Germany
推荐引用方式 GB/T 7714	Hoffmann R.,Weinkauf M.F.G.,Wiedenroth K.,et al. Morphological disparity and ontogeny of the endemic heteromorph ammonite genus Aegocrioceras (Early Cretaceous; Hauterivian; NW-Germany)[J],2019,520.
APA	Hoffmann R.,Weinkauf M.F.G.,Wiedenroth K.,Goeddertz P.,&De Baets K..(2019).Morphological disparity and ontogeny of the endemic heteromorph ammonite genus Aegocrioceras (Early Cretaceous; Hauterivian; NW-Germany).Palaeogeography, Palaeoclimatology, Palaeoecology,520.
MLA	Hoffmann R.,et al."Morphological disparity and ontogeny of the endemic heteromorph ammonite genus Aegocrioceras (Early Cretaceous; Hauterivian; NW-Germany)".Palaeogeography, Palaeoclimatology, Palaeoecology 520(2019).