국내 미기록종인 Corticaria elongata (Gyllenhal, 1827)는 딱정벌레목(Coleoptera), 섶벌레과(Lathridiidae)에 속하는 종으로 유럽과 북아프리카, 아프카니스탄, 네팔, 파키스탄, 터키, 인도, 러시아, 중국, 일본 등에 서식하고 있는 것으로 기록되어 있고 국내에는 전북 완주군에서 2015년 8월에 처음으로 채집되었다. 크기는 1.49mm이며 폭은 0.6mm이고, 높이는 0.34mm이다. 긴 타원형 모양이며 양쪽 측면은 평형에 가깝고, 등면은 적당히 솟아올랐다. 몸 색깔은 연한 갈색 혹은 짙은 노란색이고, 더듬이와 다리는 연한 노란색이다. 표피는 부드러운 털로 덮여있으며 털은 길고 기울어져있다.

This study was carried out to investigate the effect of legume cover crop culture on earthworm fauna in organic farmland. We compared sod culture with two kinds of legume crops of hairy vetch and crimson clover on organic citrus orchard to natural sod culture and conventional orchards in Jeju Island. We analyzed the soil characteristics and investigated the density of earthworms from the orchards. Organic matter content did not show much difference in soil analysis between organic and conventional orchard. But the biomass of earthworms in organic orchards is 3.8 times to 7.0 times higher than that in conventional cultivated orchards, and individuals of earthworms on organic orchards were 2.3~18 times higher than conventional orchards. The biomass of earthworms on hairy vetch and crimson clover cultivation was 44.8 g, 47.2 g in 2016, and 78.7 g, 31.8 g in 2017, respectively, which were higher than 32.8 g and 9.5 g of those on natural sod cultivation. Through this study, we found that hairy vetch and crimson clover cultivation improve the earthworm occurrence density in the soil on organic citrus orchard.