Cirriformia ryukyuensis, Jimi & Fujiwara & Kajihara, 2024
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publication ID |
https://doi.org/10.12782/specdiv.29.281 |
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persistent identifier |
https://treatment.plazi.org/id/03F55461-1E3F-FFA6-9F1D-D7D3EC08FAFB |
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treatment provided by |
Felipe |
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scientific name |
Cirriformia ryukyuensis |
| status |
sp. nov. |
Genus Cirriformia Hartman, 1936 View in CoL [Japanese name: Mizuhikigokai-zoku] Cirriformia ryukyuensis sp. nov. [New Japanese name: Okinawa-mizuhiki] ( Figs 4–6 View Fig )
Material examined. Senaga Island: one of unknown sex, body length 20 mm, body width 1 mm, 169 chaetigers, 20 October 2014, coll. N. Jimi. Holotype (NSMT-Pol H-930), COI INSD accession no. PP891597.
Description. Body length 20 mm and width 1 mm, 169 chaetigers, and color in life orange. Color in alcohol pale yellow ( Fig. 4A View Fig ). Specimen with black pigmentation in anterior ventral zone. Body elongated, dorsally inflated and grooved throughout, ventral surface not grooved. Eyes absent. Prostomium broad triangular and pigmented ( Fig. 5). Paired nuchal organs located on lateral side of prostomium, oval. Peristomium with one annulation with some wrinkles, deeply grooved in junction between peristomium and chaetiger 1. Branchiae start from chaetiger 1, one pair per segment. Branchiae arising from notopodial ridge, not shifting to mid-dorsal section. Notopodia and neuropodia separat- ed, forming shoulders shifting from a position closer to dorsum to a more median position along midbody. Two groups of dorsal tentacles arising from chaetigers 4–5; each group with 16–19 tentacles. Notopodia and neuropodia with capillary chaetae and spines. Notochaeta: 1–7 capillary chaetae per fascicle along entire body, 2–3 spines ( Fig. 6A View Fig ) present from chaetiger 29 and following chaetigers, spines short, slightly curved, blunt. Neurochaeta: 1–5 capillary chaetae per fascicle along entire body, 2–3 spines ( Fig. 6B View Fig ) present from chaetiger 16 and following chaetigers, spines short, slightly curved, blunt. Pygidium simple, with terminal anus.
Methyl Green Staining Pattern. The edge of dorsal region of chaetigers 1–3 was notably stained. Segment after tentacles were stained forming complete rings around segments, inter-segmental grooves not staining ( Fig. 4B, C View Fig ).
Etymology. This specific name is an adjective after the type locality (Ryukyu Islands).
Distribution and habitat. Only known from tidal flats of Senaga Island, Ryukyu Islands.
Remarks. This species resembles C. chicoi Magalhães, Seixas, Paiva, and Elias, 2014 and C. melanacantha (Grube, 1872) in dorsal tentacles arising from chaetigers 4–5. This species can be discriminated by branchiae starting from chaetiger 1, whereas C. chicoi start from peristomium. Also, C. melanacantha does not have hooks in notopodia.
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