Four fossil specimens of teeth belonging to the genus Heteroptychodus (Hybodontiformes: Elasmobranchii) are recorded as the first report of a fresh water elasmobranch from the Lower Cretaceous Kanmon Group. These specimens are yielded from two locations in the Fukuoka Prefecture, Kyushu Island, west Japan. These specimens are identified as Heteroptychodus steinmanni Yabe et Obata, 1930. The Heteroptychodus specimens from Japan are recorded from brackish or lacustrine sediments of Tokushima, Wakayama, Mie and Gunma Prefectures, and their geological age are limited in the Hauterivian to Barremian.
A new species of the genus Falcileptoneta KOMATSU, 1970 is described under the name Falcileptoneta ananensis sp. nov. The species have characteristic structure of male palp, and was collected from under dead leaves on the ground in forest.
The genus Tanaecia Butler, 1869, widely distributed in Southeastern Asia, has been classified into the tribe Adoliadini (Limenitidinae, Nymphalidae). In this paper, Tanaecia clathrata and the related species are discussed. The following sixteen taxa described before are mentioned: caerulescens, clathrata, coelebs, ellida, heringi, lautensis, mulsa, nicevillei, purpurea, regalis, regina, siluvana, sirius, solium, subclathrata, and violaria. The characteristics of their type specimens are examined and they are classified into four species: Tanaecia clathrata, T. heringi, T. mulsa, and T. nisakai sp. nov. A new species, T. nisakai, and two new subspecies, i. e. T. heringi siriwijaya and T. heringi riauensis, are described.