Expanding the taxonomy of crab spiders (Araneae, Thomisidae) in Sumatra: a new genus, five new species, and regional records

The taxonomy of crab spiders (Thomisidae) has been the focus of many reviews, adding new genera such as <i>Ibana</i> and <i>Crockeria</i> while synonymising <i>Ascurisoma</i> with <i>Cebrenninus</i>, and describing many new species. A collection of crab spiders from Jambi Province (Sumatra, Indonesia) revealed further diversity, resulting in the description of a new genus, <i>Rangkayo</i> Dhiya'ulhaq & Benjamin, <b>gen. nov.</b>, and five new species: <i>Crockerianeofelis</i> Dhiya'ulhaq & Benjamin, <b>sp. nov.</b> (♂♀), <i>Ibanasvarnadvipa</i> Dhiya'ulhaq & Benjamin, <b>sp. nov.</b> (♂♀), <i>Phartaroseomaculata</i> Dhiya'ulhaq & Benjamin, <b>sp. nov.</b> (♀), <i>Rangkayohitam</i> Dhiya'ulhaq & Benjamin, <b>sp. nov.</b> (♂♀), and <i>Rangkayoperkaso</i> Dhiya'ulhaq & Benjamin, <b>sp. nov.</b> (♂♀). Additionally, new records of <i>Angaeuschristae</i> Benjamin, 2013 (♂), <i>Angaeusverrucosus</i> Benjamin, 2017 (♂), <i>Crockeriakinabalu</i> Benjamin, 2016 (♂), <i>Epidiuselongatus</i> Benjamin, 2017 (♂), and <i>Phartabimaculata</i> Thorell, 1891 (♂♀) are provided for Sumatra, as well as high-resolution images of <i>Cebrenninusmagnus</i> Benjamin, 2016 (♂) and <i>Cebrenninusrugosus</i> Simon, 1887 (♀). The present study highlights the considerable biodiversity of tropical crab spiders and underscores the importance of continued taxonomic and ecological research in Southeast Asia in general, and the Indonesian archipelago in particular.