identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
4D5818AF01F751EF80974A3E96FFCDE1.text	4D5818AF01F751EF80974A3E96FFCDE1.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Phalacrostemma Marenzeller 1895	<div><p>Genus Phalacrostemma Marenzeller, 1895</p><p>New Japanese name.</p><p>Shinkai-Kanmurigokai.</p></div>	https://treatment.plazi.org/id/4D5818AF01F751EF80974A3E96FFCDE1	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Pensoft via Plazi	Nishi, Eijiroh;Kobayashi, Genki;Jimi, Naoto;Fujiwara, Yoshihiro;Kupriyanova, Elena K.	Nishi, Eijiroh, Kobayashi, Genki, Jimi, Naoto, Fujiwara, Yoshihiro, Kupriyanova, Elena K. (2026): A new species of Phalacrostemma (Annelida, Sabellariidae) from the West Mariana Ridge, northwestern Pacific. ZooKeys 1282: 305-321, DOI: 10.3897/zookeys.1282.191792
B5622CDC27E35D46B833F94F454DA642.text	B5622CDC27E35D46B833F94F454DA642.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Phalacrostemma ritto Nishi & Kobayashi & Jimi & Fujiwara & Kupriyanova 2026	<div><p>Phalacrostemma ritto sp. nov.</p><p>Figs 2, 3, 4</p><p>New Japanese name.</p><p>Ritto-Shinkai-Kanmurigokai.</p><p>Material examined.</p><p>Holotype: Japan • Western Mariana Ridge, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=142.0397&amp;materialsCitation.latitude=21.797167" title="Search Plazi for locations around (long 142.0397/lat 21.797167)">Ritto Seamount</a>, 21°47.830'N, 142°2.382'E (Fig. 1), depth 675 m; 10 October 2024, DSV Shinkai 6500 operated from RV Yokosuka, Cruise YK 24-15 C; leg. Jimi Naoto; on a spine of a cidarid sea urchin (Fig. 2 A – C); with tube; GenBank accession numbers: LC 931930 – LC 931933 (Table 2); JAMSTEC # 11820 An 93-1 . Paratype: 1 specimen with tube broken into two pieces between the anterior region and mid-abdomen; sampling data as for the holotype; GenBank accession numbers: LC 931926 – LC 931929 (Table 2); JAMSTEC # 11820 An 93-2 .</p><p>Description.</p><p>Based on the holotype and the paratype (paratype data in parentheses).</p><p>Holotype 10.0 mm in length without paleae and cauda (7.5 mm without paleae and cauda), 2.0 mm in width at parathoracic region. Operculum divided into two short, free lobes with distal ends positioned perpendicular to the longitudinal axis (Figs 2 G – I, 3 A – C). Opercular paleae longer than the operculum (Figs 2 I, 3 A); outer row with 25 paleae on the right, 28 on the left (22 on the left, 30 on the right), arranged spirally (Figs 2 F – I, 3 B).</p><p>Paleae simple, straight, with acute tips (Fig. 4 B, H); distal portions of some paleae black (Figs 2 I, 4 E, 4 F). Paleal thecae compact, with straight margins (Fig. 4 B – F, H – K). Paleae arranged in two rows; inner row with one palea on the left and two on the right (two on the left and one on the right), simple and straight with tapering tips, shorter than those of the outer row (Fig. 4 G, L, M). Eight conical opercular papillae on the right side and 11 on the left (13 on the right, 11 on the left), arranged peripherally to the outer paleae (Figs 2 F – I, 3 A – C); papillae with blunt tips (Fig. 3 A – C), approximately ½ length of the outer paleae, with a basal width / length ratio of 0.6–0.8.</p><p>Five pairs of flattened nuchal hooks; concave side limbate, with tips curved at approximately 45 °, wider than limbation (Figs 2 H, 2 I, 4 A). Median organ present at the dorsal junction of opercular lobes (Figs 2 H, 3 B); median organ slender, about ½ length of the conical opercular papillae (Fig. 3 B). Eyes not observed. Tentacular filaments absent. Buccal flaps present below a pair of palps (Figs 2 G, 2 I, 3 B, 3 C).</p><p>Chaetiger 1 (= segment 1) with neuropodial lobes and capillary neurochaetae (Fig. 3 A). Chaetiger 2 with a pair of triangular lateral lobes, a pair of neuropodial lobes, and branchiae (Figs 2 F, 2 G, 3 A). Dorsal tapering branchiae present from chaetiger 2 onwards (Figs 2 H, 3 A). Chaetigers 3–6 (parathorax) with two types of notochaetae — lanceolate ones interspersed with fine capillaries (Figs 3 A, 4 N) — and neurochaetae comprising slender lanceolate chaetae and fine capillaries.</p><p>Eleven abdominal chaetigers in the holotype and 13 in the paratype (Fig. 3 D). Eight pairs of dorsal branchiae, continuing from the second thoracic chaetiger to the third abdominal chaetiger (Fig. 3 A, E). Abdominal notopodia of chaetigers 1–5 unilobed, each with a single horizontal row of uncini (Fig. 3 D, E); notopodia of chaetigers 6 to last bilobed, forming erect, expanded tori bearing uncini (Figs 2 J, 4 O). Each uncinus with three vertical rows of teeth and 8–10 columns (Fig. 4 P, Q). Neuropodia with fine capillaries (Figs 2 J, 3 E, 3 F).</p><p>Cauda long, approximately 4.0 mm in length, equal to the combined length of the abdomen and thorax in live specimens (Fig. 2 D, E), smooth; about ¼ length of the abdomen in preserved specimens (Fig. 2 F).</p><p>Tubes attached to sea urchin spines and composed of small sand particles (Fig. 2 B, C); tubes with dark-brown inner lining; inner diameter of tubes 1.2–1.3 mm, outer diameter 2.5–3.5 mm.</p><p>Type locality.</p><p>Ritto Seamount, West Mariana Ridge, Japan (Fig. 1).</p><p>Etymology.</p><p>The specific name ritto, a noun in apposition, refers to the type locality, Ritto Seamount.</p></div>	https://treatment.plazi.org/id/B5622CDC27E35D46B833F94F454DA642	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Pensoft via Plazi	Nishi, Eijiroh;Kobayashi, Genki;Jimi, Naoto;Fujiwara, Yoshihiro;Kupriyanova, Elena K.	Nishi, Eijiroh, Kobayashi, Genki, Jimi, Naoto, Fujiwara, Yoshihiro, Kupriyanova, Elena K. (2026): A new species of Phalacrostemma (Annelida, Sabellariidae) from the West Mariana Ridge, northwestern Pacific. ZooKeys 1282: 305-321, DOI: 10.3897/zookeys.1282.191792
