Fadeeva Natalia P, Karpova Alena A
Far Eastern Federal University; FEFU Campus; 10 Ajax Bay; Russky Island; Vladivostok; 690922; Russia; A.V. Zhirmunsky National Scientific Centre of Marine Biology FEB RAS; 17 Paltchevsky St.; Vladivostok; 690041; Russia.
Zootaxa. 2024 Nov 7;5537(1):115-132. doi: 10.11646/zootaxa.5537.1.6.
Little is known about the diversity and systematics of nematodes from intertidal sands of the Sea of Japan (East Sea). Here, nematodes of the rare genus Gairleanema and two new species of the family Xyalidae are described and illustrated. Metadesmolaimus innii sp. nov. can be easily distinguished by the combination of a large conspicuous amphideal fovea and unequal long spicules (the right spicule is larger than the left one). Rhynchonema pulchrum sp. nov. can be easily distinguished from all known congeneric species in having a combination of the following features: the number of annulations from the anterior end to the anterior edge of the amphideal fovea (37-38 in males and 34 in females); amphideal fovea form and size (oval in males vs сircular in females); large spicules with proximal capitulum, gubernaculum with paddle-like apophysis and inflated precloacal annuli. Gairleanema arenosa sp. nov. is characterized by the combination of the following characters: the moderately long body (1445-1707μm), long setiform labial sensilla with bulbous swellings and thin cephalic setae; unispiral small amphidial fovea located at the posterior edge of the cephalic capsule, dorsal tooth, subventral onchia and small denticles; four-five pairs of mamilliform supplementary organs.
关于来自日本海（东海）潮间带沙地的线虫的多样性和系统分类学，我们所知甚少。在此，我们描述并展示了稀有属Gairleanema的线虫以及Xyalidae科的两个新物种。新种Innii Metadesmolaimus可以通过大而明显的侧器凹和不等长的交合刺（右交合刺比左交合刺大）的组合轻松区分。新种Rhynchonema pulchrum可以通过以下特征的组合与所有已知同属物种轻松区分：从前端到侧器凹前缘的环纹数量（雄性为37 - 38条，雌性为34条）；侧器凹的形状和大小（雄性为椭圆形，雌性为圆形）；带有近端头的大交合刺、带有桨状突起的引带和膨胀的泄殖腔前环纹。新种Gairleanema arenosa的特征如下：身体适度长（1445 - 1707μm），具带球状肿胀的长丝状唇感器和细的头部刚毛；单螺旋小侧器凹位于头囊后缘，背齿、亚腹侧齿和小齿；四到五对乳头状辅助器官。
