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Issue: Vol. 5845 No. 1: 3 Jul. 2026
Type: Article
Published: 2026-07-03
DOI: 10.11646/zootaxa.5845.1.2
Page range: 28-51
Abstract views: 33
PDF downloaded: 7

Two new species of Aricidea (Aricidea) (Annelida: Paraonidae) from the Andaman coast and the Gulf of Thailand

Marine Ecosearch Management Co.; Ltd.; 4/31 Moo 1; Namnoi; Hatyai; Songkhla; Thailand; Marine Science Learning Center; Faculty of Science; Prince of Songkla University; Hatyai; Songkhla; Thailand
Marine Science Learning Center; Faculty of Science; Prince of Songkla University; Hatyai; Songkhla; Thailand
Department of Animal Production Technology and Fishery; School of Agricultural Technology; King Mongkut’s Institute of Technology Ladkrabang; Bangkok; 10520; Thailand
Laboratório de Poliquetologia (LaPol); Departamento de Zoologia; Instituto de Biociências; Universidade de São Paulo; Rua do Matão; travessa 14; n. 101; 05508-090; São Paulo; SP; Brazil
Unidad de Ecología y Biodiversidad Acuática; Instituto de Ciencias del Mar y Limnología; Universidad Nacional Autónoma de México. Circuito Exterior S/N; Cd. Universitaria; Cd. México; México
Annelida Aricidea Paraonids Polychaeta COI taxonomy

Abstract

Two new species of Paraonidae, Aricidea (Aricidea) pacharaphoni sp. nov., and A. (A.) sathingpra sp. nov., are described from the Southwestern Pacific. Aricidea (A.) pacharaphoni sp. nov., collected in the Andaman Coast and the Gulf of Thailand, is clearly distinguished from other species of Aricidea (Aricidea) by having an elongate, faintly annulated median antenna extending to chaetigers 3–7; chaetiger 3 with distinctive globose notopodial postchaetal lobes with long digitiform terminal tips; two types of branchiae, strap-like and foliaceous; and two types of modified neurochaetae, pseudocompound and stout acicular. Aricidea (A.) sathingpra sp. nov., was collected in the Gulf of Thailand and belongs to the articulated antenna group, being separated from all other species of this subgenus by having a triarticulated antenna; pair of distinctive round furrow protuberances on the prostomium; and 6–7 pairs of wide foliaceous branchiae. We suggested that the modification and shape of the notopodial postchaetal lobes in chaetiger 3 are an important morphological character to differentiate the species of this subgenus. Molecular phylogenetic and genetic distance analyses, based on cytochrome oxidase subunit I (COI) gene sequences support the recognition of Aricidea (A.) pacharaphoni sp. nov., as a distinct species. A taxonomic key for all world species of Aricidea (Aricidea) is included.

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How to Cite

Plathong, J., Plathong, S., Klangnurak, W., Ranauro, N. & Hernández-Alcantara, P. (2026) Two new species of Aricidea (Aricidea) (Annelida: Paraonidae) from the Andaman coast and the Gulf of Thailand. Zootaxa, 5845 (1), 28–51. https://doi.org/10.11646/zootaxa.5845.1.2