The occurrence of pollen of Sciadopityaceae Luerss. through time

Here we present LM and SEM data of pollen of extant Sciadopitys verticillata, fossil Cerebropollenites from Aptian/Albian strata (Austria, Mongolia) and Sciadopityspollenites from Campanian/Maastrichtian and Oligocene/Miocene strata (Siberia, Germany). Measurements and image comparisons show that the investigated fossil pollen taxa range from somewhat comparable to very similar to extant Sciadopitys verticillata, and that a previous affiliation of Cerebropollenites taxa with Tsuga cannot be corroborated. Additionally, it can be speculated that either the Rhaetian to Lower Cretaceous Cerebropollenites taxa are the pollen equivalent of the Eurasian Miroviaceae macrofossils that have unresolved relationships with Sciadopityaceae, or that they might belong to a basal group in the Sciadopityaceae, which is quite recognizable due to the similarity of the pollen morphology of Cerebropollenites thiergartii and Sciadopitys verticillata. However, until in situ pollen within cones attributed to the Miroviaceae are found, we will not know for sure.

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Pollen morphology and ultrastructure of the corystospermales: permineralized in situ grains from the triassic of Antarctica

Review of Palaeobotany and Palynology ◽

10.1016/0034-6667(93)90023-n ◽

1993 ◽

Vol 79 (3-4) ◽

pp. 205-219 ◽

Cited By ~ 33

Author(s):

Jeffrey M. Osborn ◽

Thomas N. Taylor

Keyword(s):

Pollen Morphology

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Palaeoenvironmental significance of storm coquinas in a Lower Cretaceous coastal lagoonal succession (Vectis Formation, Isle of Wight, southern England)

Geological Magazine ◽

10.1017/s0016756800003782 ◽

2000 ◽

Vol 137 (2) ◽

pp. 193-205 ◽

Cited By ~ 13

Author(s):

JONATHAN D. RADLEY ◽

MICHAEL J. BARKER

Keyword(s):

High Resolution ◽

Principal Components ◽

Lower Cretaceous ◽

Coastal Lagoons ◽

Trace Fossils ◽

Isle Of Wight ◽

Southern England ◽

Desiccation Cracks ◽

Stratigraphic Framework

Thin bioclastic limestone beds (‘coquinas’) in the Vectis Formation (Wealden Group, Lower Cretaceous) of the Isle of Wight, southern England, exhibit a range of biofabrics and internal stratigraphies. These features are attributed to both simple and complex storm deposition of allochthonous biogenic and siliciclastic materials in coastal lagoons and on adjacent mudflats. These modes of deposition facilitated preservation of dinosaur trackways, desiccation cracks, shallow-tier trace fossils and in situ bivalve colonies through rapid burial. The coquinas thus preserve a record of surficial muds, commonly lost through reworking. The principal components of the coquinas comprise dispersed elements from within the argillaceous ‘background’ facies. Some of these beds are laterally traceable for up to 27 km, providing the foundations for a high-resolution event-stratigraphic framework.

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Pollen morphology and ultrastructure of the Bennettitales : In situ pollen of Cycadeoidea

American Journal of Botany ◽

10.1002/j.1537-2197.1995.tb11573.x ◽

1995 ◽

Vol 82 (8) ◽

pp. 1074-1081 ◽

Cited By ~ 8

Author(s):

Jeffrey M. Osborn ◽

Thomas N. Taylor

Keyword(s):

Pollen Morphology

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First fossil liverwort with in situ flask-shaped receptacles from the Lower Cretaceous of Inner Mongolia, China

Cretaceous Research ◽

10.1016/j.cretres.2020.104684 ◽

2021 ◽

Vol 119 ◽

pp. 104684

Author(s):

Ruiyun Li ◽

Xiaoqiang Li ◽

Xuelian Wang ◽

Bainian Sun

Keyword(s):

Lower Cretaceous ◽

Inner Mongolia

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Karyotype Evolution in Harvestmen of the Suborder Cyphophthalmi (Opiliones)

Cytogenetic and Genome Research ◽

10.1159/000445863 ◽

2016 ◽

Vol 148 (2-3) ◽

pp. 227-236 ◽

Cited By ~ 8

Author(s):

Hana Svojanovská ◽

Petr Nguyen ◽

Matyáš Hiřman ◽

Ivan H. Tuf ◽

Rodzay Abdul Wahab ◽

...

Keyword(s):

In Situ Hybridization ◽

Ribosomal Rna ◽

Chromosome Pair ◽

Karyotype Evolution ◽

Rdna Locus ◽

Ancestral Karyotype ◽

Rdna Probe ◽

Basal Group ◽

Rna Genes

The morphologically uniform suborder Cyphophthalmi represents a basal group of harvestmen (Opiliones). As such, it plays an important role in the reconstruction of the karyotype evolution within this arachnid order. The cytogenetic analysis of 6 representatives of the suborder Cyphophthalmi, namely Miopsalis sp. (2n = 30; Stylocellidae), Austropurcellia arcticosa (Cantrell, 1980) (2n = 30; Pettalidae), Parapurcellia amatola de Bivort & Giribet, 2010 (2n = 32; Pettalidae), Paramiopsalis aff. ramulosus Juberthie, 1962 (2n = 28; Sironidae), Cyphophthalmus duricorius Joseph, 1868 (2n = 24; Sironidae), and Siro carpaticus Rafalski, 1956 (2n = 52; Sironidae) was performed. Fluorescence in situ hybridization with 18S rDNA probe was used to analyze the distribution of major ribosomal RNA genes in harvestmen. We confront the obtained cytogenetic data with current hypotheses on cyphophthalmid phylogeny to reconstruct their karyotype evolution. We conclude that the ancestral karyotype of harvestmen consisted of 2n = 30 elements with 1 chromosome pair bearing terminal rDNA clusters. The rDNA locus was multiplicated in the evolution of Cyphophthalmi. However, decreases as well as increases in the number of chromosomes have been detected in the karyotype evolution of Cyphophthalmi. Our data thus reveal unexpected diversity in cyphophthalmid karyotypes.

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An ichthyosaur (Reptilia: Ichthyosauria) specimen from the Lower Cretaceous (Berriasian) Spilsby Sandstone Formation of Nettleton, Lincolnshire, UK

10.31233/osf.io/7yws8 ◽

2017 ◽

Author(s):

John P. Green ◽

Dean Lomax

Keyword(s):

Early Cretaceous ◽

Lower Cretaceous ◽

Sandstone Formation

A fragmentary ichthyosaur specimen collected in situ at Castle Top Quarry in Nettleton, Lincolnshire, UK from exposures of the Lower Cretaceous (Berriasian) Spilsby Sandstone Formation (Subcraspedites ?preplicomphalus Zone) is reported. In general, Early Cretaceous ichthyosaurs from the Berriasian to Barremian are poorly understood. Despite the fragmentary nature of the described specimen, it is the first ichthyosaur reported from this specific zone and adds to the literature another rare ichthyosaur from the Berriasian.

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Proapocritus lini sp. nov., a new ephialtitid wasp (Hymenoptera: Apocrita) from the Middle-Upper Jurassic of Daohugou, NE China

Palaeoentomology ◽

10.11646/palaeoentomology.3.1.8 ◽

2020 ◽

Vol 3 (1) ◽

pp. 054-058

Author(s):

HAICHUN ZHANG

Keyword(s):

Lower Cretaceous ◽

Late Jurassic ◽

Upper Jurassic ◽

Lower Jurassic ◽

Ne China ◽

Basal Group

The Ephialtitidae is an extinct family of wasps, with 29 genera reported from the Lower Jurassic-Lower Cretaceous in Kyrgyzstan, Kazakhstan, China, Mongolia, Russia, Spain, Germany and Brazil, and flourished in the Middle–Late Jurassic (Meunier, 1903; Rasnitsyn, 1975, 1977, 1990, 1999, 2008a, b; Zessin, 1981, 1985; Zhang, 1986; Darling & Sharkey, 1990; Rasnitsyn & Ansorge, 2000; Rasnitsyn & Martínez-Delclòs, 2000; Zhang et al., 2002; Rasnitsyn et al., 2003; Rasnitsyn & Zhang, 2004, 2010; Zhang et al., 2010; Ding et al., 2013, 2016; Li et al., 2013, 2014, 2015; Zhang et al., 2014). It is considered to be the most basal group of the Apocrita, one of two suborders of the order Hymenoptera (Rasnitsyn & Zhang, 2010).

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