<br> Phylogenetic relationships within the marine Chromadorea are complex, and the taxonomic positions at the family and genus levels remain flexible due to discrepancies between morphological and molecular evidence. During our taxonomic study in the Yellow Sea, two species,<br> Pseudochromadora crispata<br> sp. nov.<br> and<br> Microlaimus parakoranus<br> sp. nov.<br> , are described.<br> Pseudochromadora crispata<br> sp. nov.<br> is characterized by a short body, a coarsely annulated cuticle with lateral alae, a unispiral amphidial fovea, slightly curved spicules, a gubernaculum plate shaped with a cuticularized lateral piece, four ventral precloacal copulatory thorns, and one pair of postcloacal thorns.<br> Microlaimus parakoranus<br> sp. nov.<br> is characterized by a finely striated cuticle, short cephalic setae, a cryptocircular amphidial fovea, the absence of somatic setae, slightly curved spicules with swollen proximal ends, a heavily cuticularized gubernaculum, and a conical tail with a slightly cylindrical distal end. Phylogenetic analysis within Chromadorea indicates that the genera<br> Prodesmodora<br> and<br> Molgolaimus<br> should be transferred to Chromadorida, the genera<br> Nudora<br> and<br> Monoposthia<br> should be removed from Microlaimida based on morphological and molecular evidence, and<br> Onepunema<br> should be kept in Desmodoridae despite its anomalous phylogenetic position.<br>
