Perinereis wilsoni Glasby & Hsieh 2006
Creators: name: Yang, Deyuan
name: Zeng, Sheng
name: Wang, Zhi
name: Zhang, Yanjie
name: Yang, Dazuo
name: Glasby, Christopher J.
name: Hwang, Jiang-Shiou
name: Cai, Lizhe
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Phyllodocida
Nereididae
Perinereis
Perinereis wilsoni

description: Perinereis wilsoni Glasby & Hsieh, 2006
Fig. 1 A – K
Material examined.
• 23007-1 and 23007-2, both collected from Dalian, Liaoning, China (38.87315 ° N, 121.676671 ° E), 08 August 2023, preserved in 95 % ethanol.
Description.
Description based on 23007-1 and 23007-2. 23007-1 complete, 93 chaetigers, 7.0 cm in length, 2.9 mm wide at chaetiger 10 (excluding parapodia); and 4.0 mm wide at chaetiger 10 (including parapodia) (Fig. 1 A). 23007-2 complete, 6.5 cm in length, 98 chaetigers, 2.3 mm wide at chaetiger 10 (excluding parapodia), 3.7 mm wide at chaetiger 10 (including parapodia).
Prostomium and anterior dorsum with dark brown pigmentation. Prostomium anterior margin entire, pear-shaped, wider than long, with shallow longitudinal groove in central area. Antennae conical, about one-third length relative to prostomium length. Palps longer than prostomium, biarticulate, with palpophores and palpostyles (Fig. 1 A, C, J). Palpophores barrel-shaped, slightly wider basally, palpostyles spherical (or globular). Eyes black (Fig. 1 A).
Pharynx fully everted (Fig. 1 A, C – F, J – K). Jaws brown, with 7 teeth (based on 23007-1) (Fig. 1 B). Tentacular cirri extend back 3–12 setigers; posterodorsal one extending to chaetiger 8–12.
Paragnath counts (Fig. 1 C – E, J – K): area I with 1 conical paragnath; area II with 9 or 11 conical paragnaths on left, 11 or 14 conical paragnaths on right (23007-1, II = 9: 11; 23007-2, II = 11: 14); area III with 14–17 conical paragnaths, central patch with 9–12 in 2 rows, 2–3 laterally on either side (23007-1, III = 3: 9, 2 R: 2; 23007-2, III = 2: 12, 2 R: 3); area IV with 18–22 conical paragnaths on each side (23007-1, IV = 18: 25; 23007-2, III = 22: 22), bars absent; area V with 1 conical paragnath; area VI with 3–5 shield-shaped bars on each side (23007-1, VI = 5: 3; 23007-2, VI = 5: 5); area VII – VIII with 19 conical paragnths in 2 rows.
Notopodia with 2 lobes, prechaetal lobe absent. Dorsal cirri longer than notopodial ligule, about 1.5 times length of the notopodial ligule throughout. Notopodial ligule similar to median ligule throughout. Neuropodial postchaetal lobe rounded, not projecting beyond acicular lobe. Ventral ligule similar in length to acicular ligule in all chaetigers (Fig. 1 F, G, I).
Notopodia homogomph spinigers only. Neuropodial heterogomph spinigers present throughout. At chaetiger 10, lower neurochaetae all heterogomph falcigers, upper neurochaetae with heterogomph falcigers, and heterogomph spinigers. At chaetiger 30 and following chaetigers, lower neurochaetae present heterogomph spinigers.
Remarks.
Perinereis wilsoni was established by Glasby and Hsieh (2006), who provided a comprehensive description and discussion. In this study, we initially identified our specimens as P. wilsoni based on the key and description provided by Glasby and Hsieh (2006). Specifically, in P. wilsoni, the dorsal cirri are approximately 1.5 times the length of the dorsal notopodial lobe anteriorly and 2–3 times longer posteriorly; Area IV has 29.8 (± 3.6) conical paragnaths, and Area V has 1–3 conical paragnaths, usually in a longitudinal line. In contrast, in P. mictodonta, the dorsal cirri are either equal to or only slightly longer than the dorsal notopodial lobe throughout the body; Area IV has 35.3 (± 6.8) conical paragnaths, and Area V has 3 conical paraganths, usually in a triangle arrangement. Our specimens more closely resemble P. wilsoni, having dorsal cirri about 1.5 times the length of the dorsal notopodial lobe throughout the body (or only increasing slightly in length posteriorly), Area IV with 18–22 conical paragnaths, and Area V with 1 conical paragnath. However, despite the statistically significant difference in these morphometric characters (see pp. 573, Glasby and Hsieh 2006), the characters all show overlap (see pp. 560 & 572, Glasby and Hsieh 2006), and thus, morphology alone may not be sufficient to distinguish all specimens belonging to P. wilsoni and P. mictodonta.
The ITS genes may presently be the most effective and reliable method for accurately identifying these species, as these sequences were generated from the paratypes of P. wilsoni (Chen et al. 2002; Glasby and Hsieh 2006). DNA sequence-based NCBI BLAST and phylogenetic analyses of ITS sequences also support our identification (see next sections).
Distribution.
Japan; China (based on ITS genes). Other records require validation using at least ITS data.
description: Published as part of Yang, Deyuan, Zeng, Sheng, Wang, Zhi, Zhang, Yanjie, Yang, Dazuo, Glasby, Christopher J., Hwang, Jiang-Shiou & Cai, Lizhe, 2024, Molecular systematics of Perinereis and an investigation of the status and relationships of the cultured species Perinereis wilsoni Glasby & Hsieh, 2006 (Annelida, Nereididae), pp. 1297-1314 in Zoosystematics and Evolution 100 (4) on pages 1297-1314, DOI: 10.3897/zse.100.127201