A new species of Trileptium (Nematoda: Thoracostomopsidae) from Bahia, Brazil

ABSTRACT A new species of a free-living marine nematode found in Brazil is described: Trileptium ribeirensis sp. nov. The type material is deposited in the Nematoda collection of the Museu de História Natural da Bahia, located at the Universidade Federal da Bahia. Trileptium includes eleven valid species of nematodes that have teeth and jaws positioned forward. The species was collected with the help of corers (3.5 cm in diameter and 30 cm long) on a sandy beach in Bahia. This species is distinguished from its congeners based on a combination of characters of the male (cuticle, buccal cavity, supplement and gubernaculum). An updated taxonomic key to the genus is presented.

摘要 本文记述了在巴西发现的1个新的自由生活海洋线虫物种：里贝里三孔线虫（Trileptium ribeirensis sp. nov.）。模式标本保存于巴伊亚联邦大学（Universidade Federal da Bahia）所属的巴伊亚自然历史博物馆（Museu de História Natural da Bahia）的线虫馆藏中。三孔线虫属（Trileptium）目前共计11个有效物种，该属物种均具有前伸的齿与颌结构。该新种采自巴伊亚州的一处沙滩，采集所用工具为直径3.5厘米、长30厘米的取样管（corers）。本种可通过雄性个体的多项特征组合（包括角质层、口囊、交配辅助器及引带）与同属其他物种区分。本文同时提供了该属的更新版分类检索表。