Cylindrocorpus inevectus sp. n. associated with the oil palm weevil, Elaeidobius kamerunicus (Faust) (Coleoptera: Curculionidae), with a synopsis of the family Cylindrocorporidae and establishment of Longibuccidae n. fam. (Diplogastroidea: Nematoda)

Abstract

Cylindrocorpus inevectus sp. n. (Cylindrocorporidae: Nematoda) is described from oil palm owers (Elaeis guineensis Jacquin) and from the under surface of the elytra of the oil palm weevil, Elaeidobius kamerunicus (Faust) (Coleoptera: Curculionidae) in Malaysia. Cylindrocorpus inevectus sp. n. differs from previously described species in the genus (as de ned in the present study) by apparently having only eight pairs of genital papillae in contrast to nine or ten pairs. In addition, the male of the new species differs from C. macrolaimus (Schneider) and C. longistoma (Stefanski) by possessing a very short tail spine. The degree of stoma coverage by the pharyngeal sleeve is suggested as an important character and is 77% in C. longistoma but 91% in C. inevectus sp. n. In the male of C. erectus the bursa does not encircle the tail tip and the tail is much stouter than that of C. inevectus sp. n. In addition, there are only two pairs of pre-anal papillae and two pairs of dorso-lateral post-anal papillae in C. erectus but three pairs of pre-anal papillae and only one pair of dorso-lateral post-anal papillae in C. inevectus sp. n. From C. curzii the new species differs in having the bursal membrane continuing around the tail tip with only two pairs of pre-anal papillae reaching the bursal rim. A key to the genera of the Cylindrocorporidae is provided and Myctolaimus rif ei (Massey & Hinds, 1970) comb. n. is proposed. Because of their parasitic association with vertebrates and morphological characters distinct from those of the saprophagic Cylindrocorporidae,such as the corpus merging with the isthmus, the absence of a valve in the corpus, a posteriorly located vulva, the presence of lateral alae, a reduced number of genital papillae and ovoviviparousnature, members of the genus Longibucca, previously placed in the Cylindrocorporidae,are placed in the new family Longibuccidae fam. n.

Cylindrocorpus anoplophorae n. sp.(Nematoda: Cylindrocorporidae) isolated from the white-spotted longicorn beetle, Anoplophora malasiana (Coleoptera: Cerambycidae)

“…The body lengths of C. anoplophorae n. sp. are larger than those of C. erectus (Massey, 1960) and C. inevectus (Poinar et al, 2003). The values a of C. anoplophorae n. sp.…”

“…Five species have been included in the genus Cylindrocorpus: C. curzii, C. erectus, C. inevectus, C. longistoma, and C. macrolaimus (Poinar et al, 2003). C. anoplophorae n. sp.…”

“…Males of C. anoplophorae n. sp. have nine pairs of caudal papillae, i.e., three pairs at pre anal and six pairs at post anal, and long tail conoid, while the males of C. curzii have 10 pairs of caudal papillae (3 pre anal and 7 post anal) and short tail conoid (Goodey, 1935), C. longistoma have 10 pairs of caudal papillae (3 pre anal and 7 post anal) and long tail conoid (Goodey, 1927;Stefanski, 1922), and the males of C. erectus and C. inevectus have eight pairs of them (2 pre anal and 6 post anal) and short tail conoid (Massey, 1960;Poinar et al, 2003).…”

“…Five genera are included in the family, and each genus is distinguishable from the others based on the male bursa and female gonad (s) (Andrassy, 1984;Poinar et al, 2003): Cylindrocorpus has leptoderan bursa and paired Goodey (1939). However, Andrassy (1984) deleted the genus Cylindrocorpus as a junior synonym of the genus Myctolaimus Cobb, 1920, and located following seven species to the genus Myctolaimus: M curzii Goodey, 1935;M erectus Massey, 1960;M longistoma (Stefanski, 1922) Andrassy, 1984M macrolaimus (Schneider, 1866) Massey, 1960M pellucidus Cobb, 1920;M rifflei Massey and Hinds, 1970;M.…”

“…However, Andrassy (1984) deleted the genus Cylindrocorpus as a junior synonym of the genus Myctolaimus Cobb, 1920, and located following seven species to the genus Myctolaimus: M curzii Goodey, 1935;M erectus Massey, 1960;M longistoma (Stefanski, 1922) Andrassy, 1984M macrolaimus (Schneider, 1866) Massey, 1960M pellucidus Cobb, 1920;M rifflei Massey and Hinds, 1970;M. zamithi (Lordello, 1953) Andrassy, 1984. Poinar et al (2003, however, reestablished the genus Cylindrocorpus, described a species, C. inevectus, and moved following four species to the genus Cylindrocorpus: C. curzii Goodey, 1935;C.…”