Abstract
The family Longidoridae Thorne, 1935 is a big taxon of Dorylaimina sub-family. Its species are ectoparasites of vascular plants inhabiting terrestrial biotopes. Longidoridae is one of the most homogeneous groups of Dorylaimina, which differs distinctly in morphology and biology from other dorylaimids, but its representatives structurally and ecologically are very similar to each other. Seventeen species of this family belonging to three genera were previously reported from the territory of Ukraine. This paper presents first record of Longidorus intermedius Kozlowska & Seinhorst, 1979 and new records of closely related species Longidorus elongatus (de Man, 1876) Thorne & Swanger, 1936 from Ukraine. Data on morphology, morphometrics and main differences between Ukrainian populations of these two species are provided. Ukrainian populations of L. intermedius are also compared in details with other previously reported populations of this species, and main differences are described. The presence of only three juvenile developmental stages in L. intermedius was confirmed. In model natural and anthropogenically altered localities on the territory of Opillia, the host preference of L. intermedius and L. elongatus was analyzed in detail. On this territory, L. intermedius is closely associated with Quercus robur L., so it can be used as an indicator for natural and semi-natural forests in which oak associations represent a primary vegetation type. On the contrary, L. elongatus populations were reported from the rhizosphere of a wide range of host plants. According to its chorological characters, L. intermedius can be also used in phylogeographical research in order to determine the formation ways of nemoral complexes of soil organisms after the Last Glacial Maximum.
Highlights
The genus Longidorus Micoletzky, 1922 consists of more than 150 valid species which are ectoparasites of vascular plants inhabiting terrestrial biotopes [1]
Nine Longidorus species have been previously reported from Ukraine: Longidorus attenuatus Hoo per, 1961, L. caespiticola Hooper, 1961, L. danuvii Barsi, Lamberti, De Luca, 2007, L. distinctus Lamberti, Сholeva, Agostinelli, 1983, L. elongatus Thorne & Swanger, 1936, L. holovachovi Peneva, Susulovsky, Lazarova, 2009, L. poessneckensis Altherr, 1974, L. rubi Romanenko & Tomilin in Romanenko, 1993 and L. sylphus Thorne, 1939. [11, 13, 14]
This is the first report of L. intermedius on the territory of Ukraine
Summary
The genus Longidorus Micoletzky, 1922 consists of more than 150 valid species which are ectoparasites of vascular plants inhabiting terrestrial biotopes [1]. Four populations of Longidorus genus were identified as Longidorus intermedius Kozlovska, Seinhorst, 1979 This is the first report of L. intermedius on the territory of Ukraine. Most populations of L. intermedius were collected in oak forests from the rhizosphere of Quercus spp It has been reported on the rhyzosphere of some other plant species, for example olive Olea europea L. in Spain and from the grasses in Belgium and Poland [4, 10]. Based on these data, Bulga rian nematologists concluded that this species is closely associated with oak forests and its potential distribution range may extend eastwards to the Dnipro River [10]
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