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Pseudelzalia longisetagen. nov, sp. nov. andParamonohystera sinicasp. nov. from subtidal sediment in the East China Sea are described.Pseudelzaliais characterized by 6 labial papillae and 10 cephalic setae, cylindrical buccal cavity, elongate (>2 anal body diameter) spicules, and conico-cylindrical tail devoid of terminal setae. It differs fromElzaliaby the absence of terminal setae.Pseudelzalia longisetasp. nov. is 647–853 μm long, has 7–8 μm long cervical setae, 11–14 μm long caudal setae, 25–41 μm long spicules about 2.1–2.7 anal diameter, and pointed tail-tip.Paramonohystera sinicapossesses 12 cephalic setae, a character found in four congeners:Paramonohysterabuetschlii(Bresslau and Schuurmans Stekhoven in Schuurmans Stekhoven, 1935,ParamonohysterapilosaBoucher, 1971,ParamonohysteraconcinnaLorenzen, 1977 andParamonohysterahalerbaFadeeva and Belogurov, 1987. It differs fromP.buetschliiby shorter body (933–1023 μm versus 2000–2200 μm); fromP.pilosaby the much shorter spicules (79–88 μm versus 167 μm) and narrower head (13–16 µm versus 32 µm); fromP.concinnaby smooth cephalic setae (versus segmented); and fromP.halerbaby the absence of two rows of setae on the ventral side of the tail (versus present). Based on the evaluation of nominal species, we recognize 14 valid species and provide an emended diagnosis and a tabular key forParamonohystera. http://www.zoobank.org/urn:lsid:zoobank.org:pub:474B8F17-AED7-4078-8176-DFC499B78526 [ABSTRACT FROM AUTHOR]