Early Cretaceous enigmatic insect group showing unique wing venations and antennal sensilla

2021 ◽  
Author(s):  
Hongru Yang ◽  
Chungkun Shih ◽  
Alexandr P. Rasnitsyn ◽  
Dong Ren ◽  
Taiping Gao
Keyword(s):  
Early Cretaceous ◽  
Antennal Sensilla ◽  
Insect Group

The early development of antenna and antennal sensilla in the noctuid moth, Agrotis segetum (Insecta: Lepidoptera)

1990 ◽  
Vol 48 (3) ◽  
pp. 502-503
Author(s):  
Eric Hallberg ◽  
Lina Hansén
Keyword(s):  
Cell Death ◽  
Stem Cell ◽  
Early Development ◽  
Larval Stage ◽  
Pupal Stage ◽  
Agrotis Segetum ◽  
Antennal Sensilla ◽  
Noctuid Moth ◽  
Standard Procedures

The antennal rudiments in lepidopterous insects are present as disks during the larval stage. The tubular double-walled antennal disk is present beneath the larval antenna, and its inner layer gives rise to the adult antenna during the pupal stage. The sensilla develop from a cluster of cells that are derived from one stem cell, which gives rise to both sensory and enveloping cells. During the morphogenesis of the sensillum these cells undergo major transformations, including cell death. In the moth Agrotis segetum the pupal stage lasts about 14 days (temperature, 25°C). The antennae, clearly seen from the exterior, were dissected and fixed according to standard procedures (3 % glutaraldehyde in 0.15 M cacaodylate buffer, followed by 1 % osmiumtetroxide in the same buffer). Pupae from day 1 to day 8, of both sexes were studied.

Early Cretaceous insect camouflage

AccessScience ◽  
2015 ◽  
Keyword(s):  
Early Cretaceous

Paleobiogeographic Distribution of the Early Cretaceous Radiolarian Turbocapsula costata and Its Correlation Potential

2020 ◽  
Vol 24 (2) ◽  
pp. 89
Author(s):  
Xin Li ◽  
Atsushi Matsuoka
Keyword(s):  
Early Cretaceous ◽  
Correlation Potential

PALEOGEOGRAPHY OF THE EARLY CRETACEOUS PYAKYAKHINO-KHALMERPAYUTINSKY SWELL BASIN ACCORDING TO LITHOGEOCHEMICAL RESEARCH DATA

2020 ◽  
pp. 80-86
Author(s):  
Yu.V. Titov ◽  
◽  
S.V. Astarkin ◽  
K.V. Pavlenko ◽  
G.M. Galimova ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Research Data

Ginkgophytes of the Ul’ya flora (the Ul’ya depresiion, the Okhotsk-Chukotka volcanogenic belt)

Palaeobotany ◽  
2016 ◽  
Vol 7 ◽  
pp. 80-95 ◽  
Author(s):  
L. B. Golovneva
Keyword(s):  
New Species ◽  
Early Cretaceous ◽  
Late Cretaceous ◽  
Middle Part ◽  
Leaf Length ◽  
Volcanogenic Belt ◽  
Short Shoots ◽  
Volcanogenic Deposits

The Ul’ya flora comes from the Coniacian volcanogenic deposits of the Amka Formation (the Ul'ya depression, southern part of the Okhotsk-Chukotka volcanogenic belt). Ginkgoaleans are diverse in this flora and represented by three genera: Ginkgo, Sphenobaiera and Baiera. All specimens have no cuticle and were assigned to morphotaxa. Genus Ginkgo includes two species: G. ex gr. adiantoides (Ung.) Heer with entire leaves and G. ex gr. sibirica Heer with dissected leaves. Genus Sphenobaiera also consists of two species: S. ex gr. longifolia (Pom.) Florin with 4–8 leaf lobes and S. ex gr. biloba Prynada with two leaf lobes. Genus Baiera is represented by new species B. lebedevii Golovn., sp. nov.Leaves of this species are 25–30 cm long and 13–16 cm wide, narrowly wedge-shaped with flat slender petiole, dichotomously dissected 4–5 times into linear segments 3–6 mm wide with 6–12 veins. The length of ultimate segments is equal to about a half of leaf length. Leaves attached spirally to ovoid short shoots about 2 cm long. Among the Late Cretaceous floras similar diversity of ginkgoaleans was recorded only in the Turonian-Coniacian Arman flora from middle part of the Okhotsk-Chukotka volcanogenic belt (Herman et al., 2016). Four species of ginkgoaleans from the Ul’ya flora (except G. ex gr. adiantoides) are considered as the Early Cretaceous relicts.

Early Cretaceous platforms of southeastern France, Venezuela and Resolution Guyot : sequence stratigraphy, correlation and evolution

1994 ◽  
Vol 21 (3) ◽  
pp. 9-12
Author(s):  
Hubert Arnaud ◽  
Peter G. Flood ◽  
A. Strasser
Keyword(s):  
Sequence Stratigraphy ◽  
Early Cretaceous
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