The Tribolodon hakonensis is an anadromous fish that migrates to freshwater for spawning in spring. During this upstream migration, olfaction plays a crucial role by sensing olfactory cues dissolved in the aquatic environment. This study involved anatomical and histological analyses of the olfactory organ in the sea rundace Tribolodon hakonensis during the spawning season, from March to April 2021, in Korea. Anatomically, the external morphology of the olfactory organ comprises a pair of semicircular anterior nostrils, posterior nostrils, and nasal flaps on the snout. Internally, each olfactory organ contains an oval rosette consisting of 30 to 34 lamellae within the olfactory chamber. Histologically, the sensory epithelium exhibits a continuous distribution pattern with a thickness of 49.70±7.49 μm (range: 39.35 to 64.58 μm) extending from the anterior part to the terminal part of the olfactory lamella. This epithelium contains olfactory receptor neurons, supporting cells, basal cells, and cilia. The non-sensory epithelium, located at the terminal part, has a thickness of 48.74±5.40 μm (range: 38.06 to 59.24 μm) and features stratified epithelial cells and basal cells. Mucous cells, mucus, and lymphatic cells are found in both the sensory and non-sensory epithelia. Based on these results, the olfactory characteristics of T. hakonensis are considered suitable for its ecological traits that facilitate swimming through the middle layer of the water column. These findings could be served as foundational taxonomic data for the genus.

A Truncatipennes species, Pentagonica subcordicollis Bates is newly recorded in Korea. Here we provide a diagnosis and systematic accounts of P. subcordicollis. Consequently, a total of three species of Pentagonia have been recorded in the Korea, including the present species.

Cambodia covers an area of 181,035 sq km among them, forests cover 53 percent. As a tropical monsoon climate, average annual rainfall is about 1,400 mm(about 55 in) on the central plain and increases to as much as 3,800 mm (150 in) in the mountains and along the coast. The average annual temperature is about 27°C (about 80°F). There are many wildlife diversity in Cambodia, but regulated or unregulated logging and mining have diminished the country's wildlife rapidly. This expedition was conducted three times in 2009 (7.2-7.11, 10.16-22, 12.25-12.30). Central Cadamon Protected Forest (N 11° 41' 13" E 103° 26' 31.3") and Seima Biodiversity Conservation Area (N 12° 08' 20.8", E 106° 55' 2.7") were main area surveyed by pitfall trap, light trap and sweeping etc. As the result, totally 611 individuals of 11 families in Coleoptera was collected, among them Gonocephalumspecies of Tenebrionidae was highest number and species in Melonthidae, Chrysomelidae and Dynastidae etc., were collected, specially kind of Hydrophilidae species from wetland was surved in the expedition.