Meloidogyne arenaria
(Neal, 1889) Chitwood, 1949
Anguillula arenaria Neal, 1889
Tylenchus arenarius (Neal, 1889) Cobb, 1890
M. arenaria thamesi (Neal, 1889) Chitwood et al., 1952
M thamesi (Chitwood et al., 1952) Goodey, 1963

M. arenaria is considered one of the "major" Meloidogyne species due to its worldwide economic importance. It is commonly encountered in warmer regions and is seldom found in areas where average monthly temperatures approach freezing. It is the most morphologically and cytologically variable of the Meloidogyne species. Two host races have been differentiated , one that reproduces on peanut (race 1), and race 2 which cannot. M. arenaria is a mitotically parthenogenetic species with chromosome numbers that range from 30-50.

Most molecular RFLP studies have demonstrated that M. arenaria is most similar to M. javanica. Mitochondrial restriction digests indicate a range of variability that equals or exceeds the variability found between M. arenaria and the other mitotically parthenogenetic "major" species (M. javanica, and M. incognita).

Morphological identification
Key morphological characteristics are described in detail in Eisenback and Triantaphyllou (1991) and in Eisenback et al., (1981). They specifically mention: a highly variable perineal pattern which often is characterized by a dorsal arch that is low and rounded, with striae that range from smooth to wavy, the female stylet ( 13-17 um) that is robust and characteristically wide near the knobs, the male head shape of low to moderately rounded, and second stage juvenile stylet (10-12 um) with fairly large, distinctly separate knobs.

Key References:
Eisenback, J.D., Hirschmann, H., Sasser, J.N., and A.C.Triantaphyllou. 1981. A Guide to the Four Most Common Species of Root-Knot Nematodes, (Meloidogyne species) with a pictorial key. A Coop. Publ. Depts. Plant Pathol. and Genetics and U.S. Agency for International Development, Raleigh, NC.

Eisenback, J.D. and H.H.Triantaphyllou. 1991. Root-knot nematodes: Meloidogyne species and races. In Manuel of Agricultural Nematology, W.R. Nickle, ed. Marcel Dekker, Inc. New York. pp. 191- 274.

DNA Sequences Obtained
Specimen: Collected:
Brito DPI in culture
Special B
TXB717 Texas
TX B723 Texas