Members of the order Comatulida (Echinodermata: Crinoidea) are widely distributed on Indo-Pacific reefs, where they host a highly diverse and understudied cryptofauna, which makes them a potential source of hidden biodiversity. In this study, shallow-water crinoid populations and their symbiotic communities from the Bangka Archipelago (North Sulawesi, Indonesia) were investigated. Presence and diversity of the symbionts, focusing on their host selectivity patterns, were assessed. A total of 39 comatulid species belonging to six families were found. Overall, symbiont fauna included 70 species belonging to 11 families within eight orders. The results showed variable host specificity among symbionts’ families, and patterns correlated with host size for some symbiont taxa. This study provides the first baseline dataset of crinoid assemblages and their symbiont diversity in the understudied region of North Sulawesi, within the Coral Triangle.

Comatulida（Echinodermata：Crinoidea）目的成员广泛分布在印度太平洋礁石上，那里藏有种类繁多且研究不足的隐密动物，这使它们成为隐藏生物多样性的潜在来源。在这项研究中，调查了邦加群岛（印度尼西亚北苏拉威西省）的浅水滨海藻类种群及其共生群落。评估了共生体的存在和多样性，重点是它们的宿主选择性模式。总共发现了属于六个科的39种小种。总体而言，共生动物区系包括八个阶中11个科的70种。结果显示，共生体家族之间的寄主特异性不同，并且与某些共生类群的寄主大小相关。