Description, biologie et histologie de quatre espèces nouvelles de nématodes parasites deDryocoetes hectographus Reit. (Col. Scolytidae)

On the track of the Red Queen: bark beetles, their nematodes, local climate and geographic parthenogenesis

“…Individuals of the genus Parasitorhabditis live as such Dauerlarve in the digestive tract of bark beetles. Several studies have shown that a heavy infection by these nematodes may damage the intestinal epithelium of their hosts (Rühm & Chararas, 1957; Nickle, 1963; Lieutier, 1984a). Rühm & Chararas (1957) suggested that such lesions could result in death of their hosts but a statistical re‐analysis of their results showed that the presence of nematodes in the digestive tract was not significantly associated with dead hosts ( χ 2 = 0.065; P = 0.97).…”

“…Several studies have shown that a heavy infection by these nematodes may damage the intestinal epithelium of their hosts (Rühm & Chararas, 1957; Nickle, 1963; Lieutier, 1984a). Rühm & Chararas (1957) suggested that such lesions could result in death of their hosts but a statistical re‐analysis of their results showed that the presence of nematodes in the digestive tract was not significantly associated with dead hosts ( χ 2 = 0.065; P = 0.97). Moreover, Lieutier (1984a,b) clearly showed that despite the lesions, Parasitorhabditis exert no or only very slight effects on host performance (here: I. sexdentatus ) and do not regulate host populations.…”

Nematodes of the order Rhabditida from Tehran province, Iran. The family Panagrolaimidae with description of Halicephalobus persicus sp. n. and a key to species of Halicephalobus Timm, 1956

“…Moreover, these specimens also fit well with the population studied by Rühm (1956) On the other hand, the Iranian specimens resemble Panagrolaimus chalcographi Fuchs, 1930 andPanagrolaimus chararasi Rühm in Rühm &Chararas, 1957 in stoma shape, ovary length and female and male tail morphology, and could be confused with these species. However, Iranian specimens of P. dendroctoni can be distinguished from P. chalcographi by the cheilorhabdia refringence (not visible vs clearly visible), and stegostom morphology (without vs with denticles).…”

Relationship between the Nematodes and Bark and the Ambrosia Beetles.

“…hunanensis D. lini Ektaphelenchinae Seinurinae Zhao et al, 2008Kanzaki et al, 2009bD. teratospicularis Blastophagus Orthotomicus Taphrorychus Tomicus D. eproctatus Sriwati et al, 2008 Parasitorhabditis Rhabditidae Rhabditidae 2 Ceratocystis minor Lieutier and Laumond, 1978;Hunt and Poinar, 1971 NGM Nematode Growth Medium Kaya, 1984 Lieutier andLaumond, 1978;Rühm, 1956Rühm 1956Rühm and Chararas 1957P. hectographi Dr. hectographus I. confusus Nickle, 1963a Bl.…”