Description of Amphimonhystrella sinica sp. nov. and Cobbia zhangi sp. nov. of the family Xyalidae (Nematoda: Monhysterida) from the Yellow Sea, China Author Uang, Mian College of Life Sciences, Liaocheng University, Liaocheng 252059, China Author Sui, Xinxin 0009-0001-9679-0697 College of Life Sciences, Liaocheng University, Liaocheng 252059, China 1215702465@qq.com text Zootaxa 2024 2024-06-19 5471 3 343 354 http://dx.doi.org/10.11646/zootaxa.5471.3.4 journal article 298692 10.11646/zootaxa.5471.3.4 4d1f58d2-1ccb-4b6f-9ec2-47c453583a82 1175-5326 12190148 E5A2FCFF-9066-4A30-AEE0-3510B6BD7B32 Genus Amphimonhystrella Timm, 1961 Diagnosis (emended from Fonseca & Bezerra 2014 ). Body small, normally shorter than 1 mm . Cuticle striated or smooth under a light microscope. Inner labial sensilla papilliform; outer labial and cephalic sensilla setiform with the outer labial longer than the cephalic setae. Buccal cavity elongated with cuticularized walls. Amphidial fovea circular or oval, located relatively far from the anterior end of the body. Pharynx expanding slightly towards its base. Cardia relatively long and oval. Testes paired, the anterior testis located to the left of the intestine and the posterior one to the right. Spicules relatively short, curved ventrally. Gubernaculum present or absent. Female with an anterior outstretched ovary, left to intestine, postvulvar sac usually present. Tail conico-cylindrical with two terminal setae.