A golden age for ectoparasitoids of Embiodea: Cretaceous Sclerogibbidae (Hymenoptera, Chrysidoidea) from Kachin (Myanmar), Charentes (France) and Choshi (Japan) ambers
GONDWANA RESEARCH
Authors: Perkovsky, Evgeny E.; Martynova, Kateryna, V; Mita, Toshiharu; Olmi, Massimo; Zheng, Yan; Mueller, Patrick; Zhang, Qi; Gantier, Flavie; Perrichot, Vincent
Abstract
Sclerogibbid wasps are obligate parasitoids of webspinners (Embiodea). Both groups have a particularly scarce geological record and arc known since the Cretaceous: them am only four species of webspinners known from Burmese amber, and only two sclerogibbids were described from Barremian Lebanese and Cenomanian Burmese ambers. Here we report transferred genus from Aptian Choshi (Japan) amber and new sclerogibbids from Cenomanian Burmese and Charentese (France) ambers. The taxa described from Burmese amber are: Burrnascterogibba apt era gen. el sp. nov., Cretoscterogibba gen. nov. (with C. antennalis sp. nov., C. contractocollis sp. nov., C. neli sp. nov. and C. rasnitsyni sp. nov.) and Edrossia vetusta gen. et sp. nov. The first European fossil sclerogibbid Gallosclerogibba alnensis gen. et sp. nov. is described from Charentese amber. The holotype of Chosia yamadai Fujiyama, from Choshi amber, is re-described; it appears to be the oldest Laurasian sclerogibbid. The significant abundance and variety of Burmese sclerogibbid wasps (60% of fossil species known worldwide), as proxy of their hosts, were probably caused by the protection granted to them by the silk webs and possibly by the limited predation from omithuromorph birds or crown-group ants. While all three extant sclerogibbid genera have apterous females, genera with winged females (Creto.sclerogibba and Edrossia) dominated in Burmese amber. Small silk galleries from hosts may have favored the preservation of wings in females of Cretaceous sclerogibbids. Most new species described in the present paper, in addition to C. yamadai, are characterized by a very slender neck and a very long frontal process concealing the antennal toruli. These characters disappeared in extant species. We suggest that this loss was caused by a change in the fauna of predators, penalizing species with long neck and rostrum. (C) 2020 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
Lactobacillus rhamnosus LRa05 improves lipid accumulation in mice fed with a high fat diet via regulating the intestinal microbiota, reducing glucose content and promoting liver carbohydrate metabolism
FOOD & FUNCTION
Authors: Sun, Mengzhen; Wu, Tao; Zhang, Guohua; Liu, Rui; Sui, Wenjie; Zhang, Maomao; Geng, Jieting; Yin, Jinjin; Zhang, Min
Abstract
To elucidate the anti-obesity effect of Lactobacillus rhamnosus LRa05 through the analysis of gut microbiota and liver metabolomics, we investigated changes in gut microbiota and liver metabolomic phenotypes in mice by 16S ribosomal RNA gene sequencing and ultraperformance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry. C57BL/6J male mice were orally administered with LRa05 for 8 weeks. Body weight, serum lipid levels, and the lipid accumulation of liver cells and epididymal fat tissues in the mice fed with a high-fat diet were inhibited after treatment with LRa05 at 1 x 10(9) CFU per day per mouse. LRa05 also reshaped the gut microbiota, reduced the abundance of the pro-pathogen bacterial Streptococcus, suppressed blood and liver glucose content, and promoted liver carbohydrate and energy metabolism. Moreover, Intestinimonas and palmitoyl ethanolamide exhibited a positive correlation, whereas Enterorhabdus and vitamin B2 showed a negative correlation. Therefore, LRa05 can potentially be used as an anti-obesity probiotic in further interventions.