Deladenus prorsus n. sp. (Nematoda: Neotylenchidae) in dunnage wood from Malaysia intercepted in Ningbo, China

Abstract

Deladenus prorsus n. sp., isolated from dunnage wood originating from Malaysia and intercepted in Ningbo port, P.R. China, is described and illustrated. The dunnage wood material appeared to have holes resembling the typical exit holes of wood-boring insects and have associated blue stain. The new species is characterised by the presence of both the mycophagous and infective forms (Deladenus consists of mycetophagous-only forms and those with known female dimorphism), the body length of 814 (670-1147) and 898 (812-979) μm for mycetophagous males and females, respectively, and 1129 (1114-1352) μm for the infective female, and by the very anterior position of the excretory pore which is situated at 30.7 (24.4-33.0), 30.6 (25.4-35.6) and 37.9 (27.3-39.7) μm for the mycetophagous males and females and infective females, respectively, and the distance that the excretory pore is located anterior to the hemizonid which is 82 (77-90), 74 (54-92) and 86 (64-106) μm for the mycetophagous males and females and infective females, respectively. The diagnostic value of the excretory pore and the hemizonid of the species of the genus are discussed. The ribosomal DNA ITS region was sequenced and analysed.