Longidorus armeniacae n. sp. is described and illustrated using morphological and molecular data. It was recovered from the rhizosphere of apricot trees in Semnan province, northeast Iran. The new species is characterized by having females with plump (body width at vulva 80–123 μm, a = 44.5–68.2), medium sized body 5.0–7.4 mm long, lip region 16–20 μm wide, continuous with body contour, amphidial fovea small, pouch-like, guiding ring at 29–35 μm distance from the anterior end, odontostyle and odontophore 101–121 and 68–89 μm long, respectively, pharyngeal bulb 125–154 μm long, vulva at 48.8–59.3%, tail short (c′ = 0.5–0.7), rounded, sometimes varying to short conical; males common with 80–107 μm long spicules, 8–13 ventromedian supplements; four juvenile developmental stages present and tail in J1 with a digitate mucro. The morphological differences of the new species with 15 species having comparable morphology and/or close phylogenetic affinities namely L. arthensis, L. athesinus, L. caespiticola, L. carniolensis, L. cholevae, L. helveticus, L. iuglandis, L. lignosus, L. magnus, L. picenus, L. pius, L. poessneckensis, L. profundorum, L. raskii and L. uroshis are discussed. The polytomous identification codes of the new species are as follows: A45-B34-C23-D3-E1-F234-G1-H1-I2-J1-K7. The phylogenetic relationships of the new species and other selected species of the genus were reconstructed using LSU D2-D3 and the ITS rDNA sequences.

亚美尼亚长草n. sp。使用形态学和分子数据进行描述和说明。它是从伊朗东北部塞姆南省的杏树根际中回收的。新种的特点是雌性丰满（外阴处体宽 80-123 μm，a = 44.5-68.2），体型中等，长 5.0-7.4 mm，唇区宽 16-20 μm，与身体轮廓连续，两栖类中央凹小，袋状，距前端 29-35 μm 的导向环，齿突和齿骨长分别为 101-121 和 68-89 μm，咽球长 125-154 μm，外阴占 48.8-59.3%，尾巴短（c' = 0.5-0.7），圆形，有时变为短圆锥形；雄性常见有 80-107 μm 长的针状体，8-13 个腹中线补充剂；四个幼年发育阶段出现在 J1 中，并带有一个指状微突。L. arthensis , L. athesinus , L. caespiticola , L. carniolensis , L. cholevae , L. helveticus , L. iuglandis , L. lignosus , L. magnus , L. picenus , L. pius , L. poessneckensis , L. L. raskii和L. uroshis被讨论。新种的多歧识别码如下：A45-B34-C23-D3-E1-F234-G1-H1-I2-J1-K7。使用LSU D2-D3和ITS rDNA序列重建了新种和该属其他选定种的系统发育关系。