Classification and Characteristics Charts of the Orders Dorylaimida and Triplonchida
Nematodes in the family Longidoridae are
identified by the greatly elongated odontostyle
(50-200 Ám long) plus the odontophore which may be plain or heavily flanged.
Loof and Coomans (1972) observed that the genera Longidorus and Paralongidorus on the one hand, and Xiphinema on the other, exhibit distinct differences with regard to location, shape, and size of the nucleus of the dorsal esophageal gland. These and other observations support the subdivision of the Longidoridae into two subfamilies, Longidorinae and Xiphineminae.
Molecular characerization, based on D2-D3 region of 28S and partial 18S rRNA
genes resolves three Clades of species of Longidorus, Paralongidorus
and Xiphinema. Clade I is cmprised of
Longidorus and Paralongidorus,
Clade II of Xiphinema americanum and
Xiphidorus, and Clade III of the non-americanum
Xiphinema spp. (Palomares-Rius et
Decraemer, W, and Robbins, R.T. 2007. The who, what and where of Longidoridae and Trichodoridae. J. Nematology 39:295-297.
Lamberti, Taylor and Seinhorst, Nematode Vectors of Plant Viruses, New York: Plenum Press (1974), pp. 40-41.
Loof, P.A.A. and Coomans, A. 1972. The Oesophageal Gland Nuclei of Longidoridae (Dorylaimida). Nematologica 18:213-233.
Palomares-Rius, J.E., Cantalapiedra-Navarette, C., Gutierrez-Gutierrez, C., Liebanas, G., Castillo, P. 2013. Morphological and molecular characterisation of Paralongidorus plesioepikimis n.sp. (Nematoda: Longidoridae) from southerrn Spain. Nematology 15:363-378.
Robertson and Taylor, Nematode Ultrastructure. The Feeding Apparatus of Longidorus and Xiphinema, Scottish Horticultural Research Institute (1977), p. 3.
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