A synopsis of the Tanaidacea (Crustacea: Peracarida) of Singapore, with a review of tanaidacean diversity in Southeast Asia and the South China Sea Author Kong, Chim Chee 0000-0001-6378-9561 Department of Biological Sciences, National University of Singapore, 16 Science Drive 4, Singapore 117558. & Department of Biological Sciences, National University of Singapore, 16 Science Drive 4, Singapore 117558. & St. John’s Island National Marine Laboratory, Tropical Marine Science Institute, National University of Singapore, 18 Kent Ridge Road, Singapore 119227. tmscck @ nus. edu. sg; https: // orcid. org / 0000 - 0001 - 6378 - 9561 tmscck@nus.edu.sg text Zootaxa 2024 2024-05-16 5451 1 1 75 http://dx.doi.org/10.11646/zootaxa.5451.1.1 journal article 10.11646/zootaxa.5451.1.1 1175-5334 11232365 911E1D07-22B1-479E-8720-25DBD50D0D56 Family Parapseudidae Guţu, 1981 Remarks. The family Parapseudidae was erected by Guţu (1981) and its diagnosis later revised by Larsen (2005) and Guţu (2008) . Key features of parapseudids include the (1) absence of a well-developed spiniform coxa on pereopod-1; (2) large size of pereopod-1, in relation to pereopods 2 and 3; and (3) small length of pereopod-4 dactylus (smaller than some distal spines on the propodus). The family contains two subfamilies Pakistanapseudinae Guţu, 2008 and Parapseudinae Guţu, 2008 , which were erected by Guţu (2008) as tribes and then promoted to subfamily rank by Błażewicz-Paszkowycz & Bamber (2012) . Guţu (2008) also provided identification keys to these tribes and genera. The two subfamilies are differentiated by the relative length of the pleonites and the presence or absence of a dorsotransversal row of small setae on the first pleonite ( Guţu 2008 ). Preserved specimens of this family are notoriously fragile and thus often incomplete ( Guţu 1996 , 1998c ), resulting in taxonomic difficulties.