Correction to: ‘Revisiting Stygocapitella (Annelida, Parergodrilidae) in Japan, with insights into their amphi-Pacific diversification’ (2024), by Natsumi Hookabe et al.

R. Soc. Open Sci. 11, 231782 (Published online 19 June 2024). (https://doi.org/10.1098/rsos.231782).

The electronic publication of Hookabe et al. (2024) [1] does not include evidence of registration in ZooBank (https://zoobank.org/) within the work itself, which is a requirement by Articles 8.5.3 and 78.2.4 of the International Code of Zoological Nomenclature (2012) [2]. As a result, the newly proposed species name, Stygocapitella itoi, was rendered unavailable.

To rectify this situation, we have registered this correction article under the ZooBank LSID: urn:lsid:zoobank.org:pub:22DF47ED-12F3-4A2A-8854-454A650689BC along with species descriptions. Furthermore, we corrected a part of ‘Material and Methods’ and figure legends where specimen deposition IDs were incorrectly shown in Hookabe et al. [1].

Material and methods

All specimens were collected at Ishikari Beach and Furen Lake, Hokkaido, northern Japan, in March and September 2019 (figure 1a,b ). Pits about 105−180 cm deep were dug with a shovel on the dune, where the groundwater table was about 2 m in depth (figure 1c ). Type and voucher specimens have been deposited in the National Museum of Nature and Science, Tsukuba (NMST), Japan.

Figure 1.

Collection localities of specimens examined in the present study. (a) Map showing the collection site of the specimens examined in the present study. (b) Lands of the collection site at Ishikari Beach. (c) Image of sampling specimens, Ishikari Beach.

Results

Taxonomy

Family Parergodrilidae Reisinger 1925 [3]

Genus Stygocapitella Knöllner 1934 [4]

[Japanese name: Sunaito-gokai]

Type species. Stygocapitella subterranea Knöllner 1934 [4]

Stygocapitella budaevae Cerca, Meyer, Purschke & Struck 2020

[New Japanese name: Kita-sunaito-gokai]

(figure 2a–h )

Figure 2.

Stygocapitella budaevae, female (NMST-Pol 113497). (a) Whole body, ventral view; Roman numerals represent the chaetigers. (b) Magnification of anterior end, ventrolateral view. (c) Chaetiger 1. (d) Chaetiger 2. (e) Chaetiger 3; asterisks mark whip-like bilimbate chaetae, black arrowheads mark bilimbate chaetae, and white arrowheads mark forked chaetae. (f) Magnification of forked chaetae; black arrowheads mark teeth of forked chaetae. (g) Oocytes. (h) Posterior end showing slightly forked pygidium; arrowheads point to the anal slit on pygidium. (a–f), (h) SEM images. (g) Microphotograph taken under light microscopy. Abbreviations: pe, peristomium; pr, prostomium; py, pygidium. Scale bars: (a) 100 µm, (b) 50 µm, (c–e) 5 µm, (f) 1 µm, (g,h) 25 µm.

Material examined

Five specimens were collected at 27 m inland from a high water line, Ishikari Beach, Hokkaido Prefecture, Japan (43°14.8283ʹ N, 141°20.8683ʹ E). NMST-Pol 113496, female, preserved in formalin, 120 cm depth, on 5 March 2019. NMST-Pol 113497, female, Au-coated and mounted on a SEM stub, 120 cm depth, on 5 March 2019. NMST-Pol 113498, female, preserved in formalin, 120 cm depth, on 6 March 2019; NMST-Pol 113499, male, preserved in formalin, 130 cm depth, on 7 March 2019; NMST-Pol 113500, male, preserved in 99% EtOH, 150 cm depth, on 19 March 2019. Two specimens were collected at 6 m inland from a high water line, Furen Lake, Hokkaido Prefecture, Japan (43°17ʹ54.9ʺ N, 145°23ʹ07.7ʺ E). NMST-Pol 113501, male, preserved in 10% formalin, 130 cm depth, on 13 September 2019. NMST-Pol 113502, male, preserved in 10% formalin, 130 cm depth, on 13 September 2019.

Description

Body 0.9−1.0 mm in length, 100 µm in width; whitish and translucent in life. Prostomium broadly rounded, without appendages; peristomium followed by 1 achaetiger + 10 chaetigers + 2 achaetigers (= 13 segments) (figure 2a,b ). Chaetiger 1 bearing two whip-like bilimbate, two bilimbate and two forked chaetae (figure 2c ). Chaetiger 2 possessing four bilimbate and two forked chaetae (figure 2d ), remaining 3−10 chaetigers with two bilimbate and two forked chaetae (figure 2e ). Forked chaetae comprise two regular teeth between the outer prongs (figure 2f ). Male with paired spermioducts opening ventrally in chaetiger 9. Female with genital pores at ventral boundary between chaetigers 9 and 10, and possessing 1–2 oocytes (20−75 µm in length) (figure 2g ). Pygidium slightly forked (figure 2h ).

Remarks

The chaetal pattern of chaetiger 1 (two whip-like bilimbate, two bilimbate and two forked chaetae) and the chaetal pattern of chaetiger 2 (four bilimbate and two forked chaetae) agree with the morphology of S. budaevae Cerca, Meyer, Purschke & Struck 2020 [5].

Distribution and habitat

The species is known from Volchanets, Primorsky Krai region, Russia and Ishikari Beach and Furen Lake, Hokkaido, Japan; beach with medium-sized sand grains at or above the higher water [5].

Stygocapitella itoi sp. nov.

[New Japanese name: Ito-sunaito-gokai]

(figure 3a–g )

Figure 3.

Stygocapitella itoi sp. nov., male, paratype (NMST-Pol P−927), SEM images. (a) Whole body, ventral view; Roman numerals represent the chaetigers. (b) Magnification of anterior end, ventral view. (c) Chaetiger 1. (d) Chaetiger 2. (e) Chaetiger 3; asterisks mark whip-like bilimbate chaetae; black arrowheads mark bilimbate chaetae, and white arrowheads mark forked chaetae. (f) Magnification of forked chaetae; white arrowheads mark teeth of forked chaetae. (g) Posterior end showing slightly forked pygidium; arrow heads point to anal slit on pygidium. Abbreviations: pe, peristomium; pr, prostomium; py, pygidium. Scale bars: (a,b) 100 µm, (c–e) 5 µm, (f) 1 µm, (g) 25 µm.

ZooBank

urn:lsid:zoobank.org:act:E783F15C−1ED9−49B8-BCF2−3A25EEE7E421.

Type materials

Two type specimens, all collected at 27 m inland from the high water line, Ishikari Beach, Hokkaido Prefecture, Japan (43°14.8283′ N, 141°20.8683′ E). Holotype: NMST-Pol H−926, male, preserved in 99% ethanol, 140 cm depth, on 6 March 2019. Paratype: NMST-Pol P−927, male, Au-coated and mounted on a SEM stub, 140 cm depth, on 6 March 2019.

Additional materials

One female specimen used for DNA extraction, 150 cm depth at the same locality as type materials, on 7 March 2019. One male specimen collected at Furen Lake (43°17ʹ54.9ʺ N, 145°23ʹ07.7ʺE), 105 cm depth on 13 September 2019, used for DNA extraction.

Description

Body 0.9−1.2 mm in length, 100 µm in width, whitish and translucent in life. Prostomium broadly rounded, without appendages; peristomium followed by 1 achaetiger + 10 chaetigers + 2 achaetigers (= 13 segments) (figure 3a,b ). Chaetiger 1 was equipped with two whip-like bilimbate, one bilimbate and two forked chaetae (figure 3c ). Chaetigers 2−10 bearing two bilimbate and two forked chaetae (figure 3d,e ). Forked chaetae comprise two regular teeth between the outer prongs (figure 3f ). Male with paired spermioducts opening ventrally in chaetiger 9. Female with genital pores at ventral boundary between chaetigers 9 and 10, oocytes not recognized. Pygidium slightly forked (figure 3g ).

Remarks

Stygocapitella itoi sp. nov. possesses the same chaetal pattern as Stygocapitella australis, S. furcata Cerca, Meyer, Purschke & Struck 2020, and S. pacifica, but distinguishable from the latter three by (i) having a slightly forked pygidium and (ii) having forked chaetae that comprise two teeth and two outer prongs.

Etymology

The new species is named in honour of Dr. Tatsunori Itô (1945−1990), who greatly contributed to Japanese meiobenthology by a handbook for the general public Organisms in Sand Interstices [6].

Distribution and habitat

The species is known from Ishikari Beach and Furen Lake, Hokkaido; dunes of seacoast, moist sand.

Declaration of AI use

We have not used AI-assisted technologies in creating this article.

Conflict of interest declaration

We declare we have no competing interests.

Funding

No funding has been received for this article.