| Summary: | <i>Choniomyzon taiwanensis</i> n. sp. is described based on specimens collected from examining external egg masses of spiny lobster <i>Panulirus longipes longipes</i> (Milne-Edwards, 1868), obtained from Hualien, Taiwan. The new species differs from its congeners in possessing the following characteristics: (1) small prosome (about 0.84 mm); (2) armature of antennule being 1, 1, 2, 2, 1, 1, 1, 2, 1, 1+1 (aesthetasc), 4, 6+1 (aesthetasc); (3) five-segmented antenna; (4) second segment of antenna bearing 1 inner seta; (5) two-segmented maxilla. Based on the evidence of distinctive morphological features and host preference, <i>Choniomyzon taiwanensis</i> n. sp. is a new species. Until now, four species of <i>Choniomyzon</i> have been known living on decapods, and the new species reported here is the first record of <i>Choniomyzon</i> species from spiny lobster in Taiwanese waters.
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