The family Symphytognathidae is reported from Thailand for the first time. Three new species: , , and are described and illustrated. Distribution is expanded and additional morphological data are reported for Lin & Li, 2009. Specimens were collected in Thailand between July and August 2018. The newly described species were found in the north mountainous region of Chiang Mai, and was collected in the coastal region of Phuket. DNA sequences are provided for all the species here studied. The relations of these symphytognathid species were tested using previously published phylogenetic analyses on micro orb-weavers. Also, we used micro CT analysis to build 3D models of the male genitalia and somatic characters of two species of Wunderlich, 1995. The molecular phylogeny and 3D models were used to discuss the taxonomy and circumscription of the currently valid symphytognathid genera, with focus on and Marples, 1951. Based on this, three new combinations are suggested: (Lin & Li, 2009), , (Lin & Li, 2009), , and (Lin & Li, 2009), A new record of Miller et al. 2014 is reported from Brunei.

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http://dx.doi.org/10.3897/zookeys.1012.57047DOI Listing

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