Arin Ngamniyom, Rakchanok Koto, Weerawich Wongroj, Thayat Sriyapai, Pichapack Sriyapai, and Busaba Panyarachun

DOI: 10.14456/sjst-psu.2018.143

pp. 1158 - 1166

Abstract

Scale-worms are polychaetes of the family Polynoidae that are commonly distribute in marine environments. This
study aims identify and introduce two scale-worms as Capitulatinoe cf. cupisetis and Eunoe cf. oerstedi from the western coast of
the Gulf of Thailand. Using scanning electron microscopy of adult worms, the antennae, palps, prostomium, cirri, setigers,
parapodia, saetae and elytra are described. In addition, the phylogenetic relationships of our specimens with other polychaete
species were analyzed based on partial sequences of 28S, 18S and 16S ribosomal DNA (rDNA) genes. The rDNA sequences
identified C. cf. cupisetis and E. cf. oerstedi were respectively recovered within Arctonoinae and Polynoinae in a monophyletic
Polynoidae. The congruence or incongruence of the morphological and molecular data is discussed in the text. These findings
increase the knowledge of polynoid polychaete worms in Thailand, although two scale-worms remain to be identified of the
precise species