Two new species of Parahesione (Annelida: Hesionidae) associated with ghost shrimps (Crustacea: Decapoda) and their phylogenetic relationships

Naoto Jimi; Hiroki Nakajima; Taigi Sato; Brett C Gonzalez; Sau Pinn Woo; Greg W Rouse; Temir Britayev

doi:10.7717/peerj.16346

Two new species of Parahesione (Annelida: Hesionidae) associated with ghost shrimps (Crustacea: Decapoda) and their phylogenetic relationships

PeerJ. 2023 Nov 1:11:e16346. doi: 10.7717/peerj.16346. eCollection 2023.

Authors

Naoto Jimi^{1

2}, Hiroki Nakajima³, Taigi Sato³, Brett C Gonzalez⁴, Sau Pinn Woo⁵, Greg W Rouse⁶, Temir Britayev⁷

Affiliations

¹ Nagoya University, Toba, Japan.
² Centre for Marine and Coastal Studies, Universiti Sains Malaysia, Penang, Malaysia.
³ University of the Ryukyus, Okinawa, Japan.
⁴ Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology, Washington D.C., United States.
⁵ Universiti Sains Malaysia, Penang, Malaysia.
⁶ Scripps Institution of Oceanography, California, United States.
⁷ AN Severtzov Institute of Ecology and Evolution, Moscow, Russia.

Abstract

Two new species of Hesionidae, Parahesione pulvinata sp. nov. and Parahesione apiculata sp. nov. are described based on materials collected at tidal flats in Okinawa (Japan) from burrows of the ghost shrimps Neocallichirus jousseaumei and Glypturus armatus. The two new species are characterized by having eight enlarged cirri, dorsal cirrophores with dorsal foliose lobe and biramous parapodia, and by lacking median antenna. Parahesione apiculata sp. nov. has digitate lobes on the posterior margin of the dorsal foliose lobe (absent in P. pulvinata sp. nov.). The two new species were never found outside the ghost shrimp burrows, suggesting they are obligate symbionts. Phylogenetic analyses based on four concatenated genes suggest that the symbiotic lifestyle has evolved several times in Hesionidae.

Keywords: Decapoda; Papua New Guinea; Polychaeta; Polychaetes; Ryukyu Islands; Symbiosis.

MeSH terms

Animal Distribution
Animal Structures
Animals
Annelida*
Decapoda*
Phylogeny
Polychaeta*

Grants and funding

This study was supported by the JSPS KAKENHI (No. JP19J00160) and the Environment Research and Technology Development Fund (Grant Number: JPMEERF20204R01) of the Environmental Restoration and Conservation Agency of Japan to Naoto Jimi. This work was also supported by the Christensen Foundation for Madang collecting by Greg Rouse. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.