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A new fossil species, Stenophlebia ryonsangensis n. sp. (Stenophlebiidae), collected from the Lower Cretaceous non-marine Sinuiju Formation, North Phyongan Province, has the following forewing characters: preserved wing slender and longer than 47.1 mm; Cr long, with three cells below it, and well aligned with distal part of ScP; Sn shorter than Cr, one cell long; supplementary veinlet below Sn aligned with RP2 and about two cells long; base of IR1 five cells distal of base of RP2. This well preserved material is the first odonatan reported in the DPRK. Congeneric species has previously been found in the Lower Cretaceous Yixian Formation of western Liaoning Province, Northeast China, thus the new discovery of Stenophlebia ryonsangensis n. sp. may contribute to evaluating the distribution and migration of Stenophlebidae and may further indicate the close relationship of the fossil layer with the famous Jehol Biota in Northeast China.

The insect fossils were collected from the Lower Cretaceous Sinuiju Formation in Paekto-dong, Sinuiju City, North Pyongan Province, Democratic People's Republic of Korea (DPRK). A new genus with a new species, Sinuijuhelorus baektoensis gen. et sp. nov., is described and assigned to the family Heloridae. In addition, a new species, Angarosphex baektoensus sp. nov. (Angarosphecidae) is also described. The new species not only indicate that the genus Angarosphex reached the DPRK in the Early Cretaceous, but also broaden the distribution and diversity of the family Heloridae.

Two fossil snakefly specimens from the Lower Cretaceous (Barremian–Aptian) of the Sinuiju Formation in Sinuiju City, DPRK are described and figured. They are considered as the first representatives of two new species, namely: Mesoraphidia ryonsangensis sp. nov. and M. baekthoensis. sp. nov. and placed in the family Mesoraphidiidae. These descriptions increase the diversity of snakeflies from the Lower Cretaceous.

Two new species of Hymenoptera are described from the Lower Cretaceous (Barremian–Aptian) Sinuiju Formation in Paektho-dong, Sinuiju City, North Phyongan Province, DPRK. They are: Karataus ryonsangensis sp. nov. (Ephialtitidae) and Pompilopterus ryonsangensis sp. nov. (Angarosphecidae). These fossils highlight the diversity of the hymenopterans from the Sinuiju Formation and the need to document the DPRK deposits.

A new fossil genus and species, Phyonganpodagrion ryonsangae sp. nov. (‘Megapodagrionidae’) is described from the third member, the Sinuiju Formation, Barremian–Aptian, Lower Cretaceous, Ryonsang-dong, Sinuiju City, North Phyongan Province, DPRK. The new species distinctly differs from Cretapodagrion sibelleae Huang et al., 2018 in postnodal area with only 17 postnodal crossveins; a single row of cells (partly with two rows of cells) between IR1 and RP1; distal side of discoidal cell not oblique; base of RP3/4 well basad of subnodus; base of IR2 aligned with subnodus.

The orthopteran Parahagla sibirica Sharov, 1968 (Prophalangopsidae) was collected from the nonmarine sedimentary strata from the Sinuiju Formation, Ryonsang-dong, North Phyongan Province, DPRK. On the basis of the well preserved orthopteran specimen, the third member of the Sinuiju Formation is correlated with the Jianshangou of the Yixian Formation, China.

Several cockroach specimens were recovered from the Sinuiju Formation in Paektho-dong, Sinuiju City, North Phyongan Province, Democratic People's Republic of Korea (DPRK). These specimens belong to Habroblattula drepanoides Wang, Liang et Ren, 2007. Fossil plant assemblages also recovered from the Sinuiju Formation are typical of Early Cretaceous floras from warm to temperature regions.

Numerous cockroach specimens are found in the materials collected in the Sinuiju Formation from Paektho-dong, Sinuiju City, North Phyongan Province, Democratic People's Republic of Korea (DPRK). Of them, there is Perlucipecta aurea Wei et Ren, 2013, which belongs to the Mesoblattinidae. This discovery not only extends the geographic distribution of Perlucipecta in the Mesozoic but also fills a blank in Mesoblattinidae study in Sinuiju region.

The beetle species Zygadenia liui (Coleoptera: Cupedidae: Ommatinae) is found in the materials collected in the Sinuiju Formation from Paekto-dong, Sinuiju City, North Pyongan Province, Democratic People's Republic of Korea (DPRK). This discovery extends the geographic distribution of Zygadenia in the Mesozoic.

A new fossil species, Stellularis sinuijuensis sp. nov. (Procercopidae) is described. New specimens were collected from the Lower Cretaceous nonmarine sedimentary strata from the Sinuiju Formation of DPRK. The remarkable new Procercopid distinctly differs from Stellularis longirostris Chen, Yao et Ren, 2015in having a tegmen with CuA1 3 times as long as CuA2, crossvein ir distal to crossvein r-m and crossvein m-cua at level of crossvein ir, and having a hind wing with apical margins lobate and CuP curved anteriorly, terminating at running to margin. The well preserved materials reveal fine details of the tegmen and hindwing.

A new fossil long-horned grasshopper together with a simple leg of Orthoptera were collected from the third member of the Sinuiju Formation from Paekto-dong, Sinuiju City, North Pyongan Province, Democratic People's Republic of Korea (DPRK). A new genus and species, Sinuijuboilus baektoensis gen. et sp. nov., is assigned to the family Prophalangopsidae. The new find not only broadens the distribution of the family Prophalangopsidae but also increases its diversity. This is the first fossil Orthoptera to be formally described from the Mesozoic of DPRK.