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A second species of the extinct scydmaenine genus Cretoleptochromus Cai & Huang, C. burmiticus sp. nov., is described and figured based on three exquisitely preserved specimens embedded in mid-Cretaceous Burmese amber. The new taxon possesses an extremely elongate body form and strongly extended legs and antennae that provide reliable means for species diagnosis and a ready separation from the only known congener, the type species C. archaicus Cai & Huang, also reported from Burmese amber. The morphology of C. burmiticus also suggests that this species was probably an active diurnal predator living in open environments. 相似文献
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A remarkable new genus and species, Mesallotrochus longiantennatus n. gen. n. sp., is described and figured based on a well-preserved individual in the lowermost Upper Cretaceous (Cenomanian) amber from Myanmar. Mesallotrochus is placed in the extant tribe Thoracophorini based on its general habitus, including the protibia with inner edge straight, without ctenidium, exposed protrochantins, open procoxal cavities, and more or less flatted body. Mesallotrochus is separated from other allied genera by the long antennae, very long maxillary palpomere 4, contiguous procoxae, and well-developed anterolateral pronotal angles. The new discovery of the oldest Osoriinae from about 99 million years not only suggests the antiquity of the subfamily, but also bears significant biogeographic implications. 相似文献
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Two new Early Cretaceous fossil rove beetle species, Paleosiagonium brevelytratum n. gen. n. sp. and Paleosiagonium adaequatum n. gen. n. sp. are described from the Lower Cretaceous Yixian Formation of Liaoning Province, China. They are clearly placed in the extant Piestinae according to the following characters: body elongate and flat; anterior coxae small and globose; abdomen long and parallel-sided, with six visible sterna and one pair of paratergites on segments III–VII. This is the first report on the occurrence of the coleopteran subfamily Piestinae in the fossil record. The new discoveries indicate that Piestinae have originated at least by the Early Cretaceous, at about 125–120 Ma. 相似文献
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A new genus and species, Prajna tianmiaoae gen. & sp. nov., is described and figured based on a well-preserved individual in Cretaceous amber from northern Myanmar. Prajna is definitely placed in the extant tribe Thinobiini Sahlberg of the staphylinid subfamily Oxytelinae Fleming based on its mostly convergent gular sutures, distinctly delimited and constricted neck, subulate maxillary palpi 4, stylus-bearing sternite IX in females, closely situated mesocoxae, spineless tibiae, 3-3-3 tarsal formula with strongly compressed basal two tarsomeres and with lobes on tarsomere 2, and typical Thinobiini-like pubescence. Prajna is separated from other allied genera by the depressions on the head, complete epistomal suture, slender maxillary palpomere 3, subulate palpomere 4, and tri-sulcate pronotum. The new genus combines some key characters of both Oxytelini and Thinobiini, indicating the close relatedness of the two tribes. 相似文献
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