Yeatesinia barbata gen. n., sp. n. (Nematoda: Plectida: Plectidae), a most remarkable nematode from New Zealand

in Nematology
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The new genus and species Yeatesinia barbata gen. n., sp. n. is described from a sand dune habitat in New Zealand. The new genus is characterised by a body length of 299-357 μm in females and 304-361 μm in males, lip region rounded dorso-ventrally, broad laterally, dorsally inclined, lateral sides of lip region with two large, horn-like, projections, each bearing one seta at its base, each amphid surrounded by three setiform sensilla, oral opening a broad transverse slit located on the dorsal body surface, and different structure of cuticle in the dorsal and ventral body sectors. This combination of unique morphological characters clearly separates the new genus from all other members of the Plectidae. The phylogenetic affinities of Yeatesinia gen. n. and its relationships to other genera of the family Plectidae are discussed.

Yeatesinia barbata gen. n., sp. n. (Nematoda: Plectida: Plectidae), a most remarkable nematode from New Zealand

in Nematology



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    Examples of free-living nematodes with subterminal position of the oral opening (arrows), median section view of anterior body end. A: Subdorsal oral opening in Yeatesinia barbata gen. n., sp. n.; B: Subdorsal oral opening in Campylaimus sp.; C: Subdorsal oral opening in Diplopeltula sp.; D: Subventral oral opening in Elaphonema sp. (Scale bar: A-D = 20 μm.)

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    Yeatesinia barbata gen. n., sp. n. A: Entire female; B: Female anterior end, surface view; C: Entire male; D: Male anterior end, surface view. (Scale bar: A-D = 20 μm.)

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    Diagrammatic view of labial region of Yeatesinia barbata gen. n., sp. n. (Not to scale.)

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    SEM of Yeatesinia barbata gen. n., sp. n. A, B: Entire female; C: Anterior end, left subventral view; D: Anterior end (collapsed due to fixation), right lateral view; E: Anterior end, dorsal view showing oral opening; F, G: Anterior end, apical view. (Scale bars: A, B = 50 μm; C-G = 5 μm.)

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    SEM of Yeatesinia barbata gen. n., sp. n. A: Female tail, lateral view; B: Posterior part of female tail, lateral view; C: Lateral ala and deirid (arrow); D: Vulval region showing vulva and somatic sensilla; E: Male cloacal region, subventral view (arrow points at mid-ventral precloacal setiform sensillum); F: Male posterior end, left lateral view; G: Posterior part of male tail, lateral view; H: Male caudal region, lateral view; I: Male caudal region, subventral view. (Scale bars: A, F, H, I = 10 μm; B-E, G = 5 μm.)

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