FIGURE 6 in Partial revision of Japanese Pectinariidae (Annelida: Polychaeta), including redescriptions of poorly known species

FIGURE 6. Pectinaria hiuchiensis. Body, chaetae, hooks and uncini of CBM-ZW 1052. (A) Entire animal, lateral view. (B) Head and anterior part, lateral view. (C) Head and first chaetiger, dorsal view. (D) Palea. (E) Scaphe, dorsal view. (F) Hooks. (G–H) Chaetae of anterior chaetiger. (J) Uncinus from middle chaetiger. Scale bars 1 mm (A, B, C, E, F); 0.5 mm (D); 50 µm (G); 10 µm (H, J).Published as part of Nishi, Eijiroh, Matsuo, Kanako, Kazama-Wakabayashi, Maki, Mori, Atsushi, Tomioka, Shinri, Kajihara, Hiroshi, Hamaguchi, Masami, Kajihara, Naoto & Hutchings, Pat, 2014, Partial revision of Japanese Pectinariidae (Annelida: Polychaeta), including redescriptions of poorly known species, pp. 433-445 in Zootaxa 3895 (3) on page 440, DOI: 10.11646/zootaxa.3895.3.8, http://zenodo.org/record/23159

Lagis Malmgren 1866

GENUS <i>Lagis</i> Malmgren, 1866 <p> Type species. <i>Lagis koreni</i> Malmgren, 1866</p>Published as part of <i>Nishi, Eijiroh, Matsuo, Kanako, Kazama-Wakabayashi, Maki, Mori, Atsushi, Tomioka, Shinri, Kajihara, Hiroshi, Hamaguchi, Masami, Kajihara, Naoto & Hutchings, Pat, 2014, Partial revision of Japanese Pectinariidae (Annelida: Polychaeta), including redescriptions of poorly known species, pp. 433-445 in Zootaxa 3895 (3)</i> on page 437, DOI: 10.11646/zootaxa.3895.3.8, <a href="http://zenodo.org/record/231594">http://zenodo.org/record/231594</a&gt

Pectinaria hiuchiensis Kitamori 1965

<i>Pectinaria hiuchiensis</i> Kitamori, 1965 <p>[Japanese name: Hiuchi-umi-isagomushi] (Figs 6–7)</p> <p> <i>Pectinaria hiuchiensis</i> Kitamori, 1965: Kitamori (1965, 47).</p> <p> <b>Material examined.</b> (Non-type material) CBM-ZW 498, Takamoku-jima, Amakusa, west Kyushu. CBM-ZW 1052, St. AG8D, Ariake Sound, Kyushu, 32.96722222N, 130.42472222E, 12 November 2005, 22 m, mud, dredge, coll. K. Mori. KMNH-IvR 500, 694 and AM W 43556, same data as CBM-ZW 1052.</p> <p> <b>Description.</b> Based on CBM-ZW 1052 and 498. Body length 38 mm (CBM-ZW 1052) and 45 mm (CBM-ZW 498) including scaphe, width 8.0 mm at cephalic region, 5.0 mm at tail. Crown (operculum) with 9–10 paleae on each side. Paleae stout, flattened golden bristles, tapering to curved pointed tip (Fig. 6 D). Cephalic membrane (cephalic veil) with 32–35 papillae. Raised cephalic rim without marginal papillae.</p> <p>First pair of tentacular cirri arise from posterolateral margin of segment I. Second pair of tentacular cirri present on segment II, arise from connecting ridge (Fig. 6 B). Venter of segments III–V slightly glandular and smooth. Second segment without posterodorsal lobe (Fig. 6 A, B).</p> <p>Comb-like branchiae present on segments III–IV, each consisting of series of loose, flat lamellae (Fig. 6 A, B). Small ear-lobe (lappet) situated on dorsal side of first pair of branchia (Fig. 6 A). Glandular median plate (ventral shield) on segments III–V; lateral plate of segment IV extending to tuft of branchiae (Fig. 6 A, B). Dorsal chaetigers 17 pairs (on segments V–XXI), each bearing two kinds of bristles; one bordered with serrations along anterior portion, recurved dorsally, the other chaetae stout, straight, tapering to very acute tip (Fig. 6 G, H). Uncinigerous tori 13 pairs (on segments VIII–XX), segment XXI with lateral lobe bearing no uncini; uncini with 8 major teeth in lateral view, 6–7 minute (minor) teeth (Figs 6 J, 7B, C). Scaphe ovoidal, flattened dorsally, broadly divided into 2–3 lobes on each lateral margin by shallow notches, each lobe being furnished with small cirriform papillae (Fig. 6 A, E). Free end of scaphe with spatulate valve. Scaphal hooks 8–9 pairs, straight and slightly bent towards tip (Figs 6 F, 7A). Tube made of sand, 40 mm length, tube opening 9.0 mm in width, posterior aperture 5.0 mm wide.</p> <p> <b>Taxonomic remarks.</b> After the original description by Kitamori (1965), Sato (2010) recorded the species from Kaminoseki, the Seto Inland Sea area of Yamaguchi Prefecture. Sato <i>et al.</i> (2014) also recorded <i>P</i>. <i>hiuchiensis</i> from off Hiroshima, Tokushima, Okayama, and Kagawa, the Seto Inland Sea. The present paper is the fourth record of this species in Japan and a new record from Ariake Sound, extending its distribution westward from the Seto Inland Sea (see Fig. 1).</p> <p> Among the 22 described species of <i>Pectinaria</i> (Kitamori 1965, Hutchings & Peart 2002), <i>P. hiuchiensis</i> can be distinguished from other species by a combination of characters: the number of papillae (30–38) on the margin of the cephalic veil, number of pairs of cephalic spines (9–11), number of rows of major teeth on the uncini (2), and the number of pairs of scaphal hooks (9–10). <i>Pectinaria hiuchiensis</i> can be distinguished from other Japanese <i>Pectinaria</i> by the number of major teeth rows on uncinus (2 in <i>P</i>. <i>hiuchiensis</i>, 3–4 in <i>P. okudai</i>) and the number of chaetigers with uncini (13 in <i>P</i>. <i>hiuchiensis</i>, 12 in <i>P. okudai</i>). More information on other <i>Pectinaria</i> is in Kitamori (1965: unnumbered Table in p. 48).</p> <p>The number of cephalic spines, papillae on cephalic veil, and scaphal hooks varies between specimens examined, compared to those described by Kitamori (1965).</p>Published as part of <i>Nishi, Eijiroh, Matsuo, Kanako, Kazama-Wakabayashi, Maki, Mori, Atsushi, Tomioka, Shinri, Kajihara, Hiroshi, Hamaguchi, Masami, Kajihara, Naoto & Hutchings, Pat, 2014, Partial revision of Japanese Pectinariidae (Annelida: Polychaeta), including redescriptions of poorly known species, pp. 433-445 in Zootaxa 3895 (3)</i> on pages 439-441, DOI: 10.11646/zootaxa.3895.3.8, <a href="http://zenodo.org/record/231594">http://zenodo.org/record/231594</a&gt

Pectinaria Savigny

GENUS <i>Pectinaria</i> Savigny in Lamarck, 1818 <p> <i>Pectinaria</i> Savigny in Lamarck, 1818: 348.— Hartman (1941, 329).— Hartman (1959, 479).— Fauchald (1977, 120).— Holthe (1986, 20–21).</p> <p> <b>Diagnosis.</b> Rim of cephalic veil with numerous long cirri. Cephalic veil completely free from operculum, forming a dorsal semi-circular lobe covering the bases of numerous peristomial palps. Raised opercular margin smooth. Chaetigers 1–3 (segments V–VII) with notopodia and notochaetae only, chaetigers 4 to 15 or 16 biramous with notopodia, neuropodia, notochaetae and neurochaetae, chaetiger 16 or 17 with notopodia and notochaetae only <b>(</b> 16/ 12 or 17/13 <b>)</b>. Two types of notochaetae, smooth and serrated (or plumose). Neurochaetal uncini with major teeth arranged in two or three (or more) rows. Posterior 5 segments fused to form a flattened plate or scaphe and distinctly separated from the abdomen (based on Hutchings & Peart 2002: with underline—this study).</p>Published as part of <i>Nishi, Eijiroh, Matsuo, Kanako, Kazama-Wakabayashi, Maki, Mori, Atsushi, Tomioka, Shinri, Kajihara, Hiroshi, Hamaguchi, Masami, Kajihara, Naoto & Hutchings, Pat, 2014, Partial revision of Japanese Pectinariidae (Annelida: Polychaeta), including redescriptions of poorly known species, pp. 433-445 in Zootaxa 3895 (3)</i> on page 439, DOI: 10.11646/zootaxa.3895.3.8, <a href="http://zenodo.org/record/231594">http://zenodo.org/record/231594</a&gt

Pectinaria okudai Imajima & Hartman 1964

<i>Pectinaria okudai</i> (Imajima & Hartman, 1964) <p>[Japanese name: Okuda-umi-isagomushi] (Figs 8–9)</p> <p> <i>Pectinaria</i> (<i>Cistenides</i>) sp.: Okuda (1938, 128).</p> <p> <i>Cistenides okudai</i> Imajima & Hartman, 1964: 328.</p> <p> <i>Pectinaria okudai</i>: Kitamori (1965:46).— Nishi <i>et al.</i> (2012, 142).</p> <p> <b>Material examined.</b> IzRO-Pol-001-005, Shinjiko Lake, brackish water, 1–2 m, sandy mud, coll. D. Kataoka, deposited in Izumo Office of River, Chugoku Regional Development Bureau, Ministry of Land, Infrastructure and Transport, Japan.</p> <p>CBM-ZW 1053, Nakatsu Tidal Flat, Suo-Nada, Seto Inland Sea (Fig. 1), 33.6047636884N, 131.2378156185E, July 2012, intertidal muddy bottom, collected by hand, coll. E. Nishi. AM W 45877, Shinjiko Lake, and Nakaumi Lake, Shimane, muddy bottom, July 2012.</p> <p> <b>Description.</b> Based on 5 individuals of IRO-001-005. Body length 10–22 mm including scaphe, width 5 mm at cephalic region, 2 mm at tail. Crown (operculum) with 13–16 paleae on each side. Paleae tapering to pointed tip. Tips with rough teeth on inner side, recurved. Cephalic membrane (cephalic veil) with 10–15 papillae. Raised cephalic rim without marginal papillae.</p> <p>First pair of tentacular cirri arise from posterolateral margin of segment I. Second pair of tentacular cirri present on segment II, arise from a connecting ridge (Fig. 8 A). Second segment without posterodorsal lobe (Fig. 8 A).</p> <p>Comb-like branchiae present on segments III–IV, each consisting of a series of loose, flat lamellae (Fig. 8 A). Glandular median plate (ventral shield) on segments III–V (Fig. 8 A). Dorsal chaetigers 16 pairs (on segments V–XX), each bearing two kinds of bristles; one bordered with serrations along anterior portion, recurved dorsally, other stout, straight, tapering to acute tip (Figs 8 F, G, 9A, B). Uncinigerous tori 12 pairs (on segments VIII–XIX), segment XX (= 16th chaetiger) with lateral lobe without uncini; uncini with 7–9 major teeth in lateral view, arranged in 3–4 irregular rows, with over 30 minute (minor) teeth (Figs 8 H, J, 9D). Scaphe ovoidal, flattened dorsally, broadly divided into 6 lobes on each lateral margin (Fig. 8 A, D). Free end of scaphe with spatulate valve. Scaphal hooks 12–13 pairs, straight with slightly curved tip (Figs 8 E, 9C). Tube made of sand, ca. 30 mm in length, tube opening 2.0–3.0 mm in width, posterior aperture 1.5–2.0 mm wide.</p> <p> <b>Taxonomic remarks.</b> This species was first described from the Ise Sea (= currently Ise Bay) by Okuda (1938) and later redescribed by Imajima and Hartman (1964) as <i>Cistenides okudai</i>, new name. Kitamori (1965) recorded the same species with a note on uncini, as a species of <i>Pectinaria</i>. Recently the species was recorded in Shinjiko and Nakaumi Lakes and Seto Inland Sea (Nishi <i>et al.</i> 2012, 2013). The genera <i>Cistenides</i> and <i>Pectinaria</i> are distinguishable by the number of rows of large teeth in the uncini, the former has a single row of large teeth, the latter has two or three (or four) rows of large teeth. Based on scanning electron microscope observations, <i>Pectinaria okudai</i> (= <i>Cistenides</i> sp. <i>sensu</i> Okuda 1938) has 3–4 rows of teeth (Fig. 9 D; Nishi <i>et al.</i> (2012) and thus it had moved to the <i>Pectinaria</i> from <i>Cistenides</i> (Nishi <i>et al.</i> 2012). Hutchings & Peart (2002) showed the diagnosis of <i>Pectinaria</i> as “Neurochaetal uncini with major teeth arranged in two rows” (p. 110). Then we have changed the generic character to “uncini with 2 or 3 (or more) rows of teeth” (see above diagnosis of the genus) because some <i>Pectinaria</i> have 3 or more rows of large teeth in uncini.</p> <p> <i>Pectinaria okudai</i> is differentiated from other species in the genus by the number of uncinigerous tori and uncini shape.</p>Published as part of <i>Nishi, Eijiroh, Matsuo, Kanako, Kazama-Wakabayashi, Maki, Mori, Atsushi, Tomioka, Shinri, Kajihara, Hiroshi, Hamaguchi, Masami, Kajihara, Naoto & Hutchings, Pat, 2014, Partial revision of Japanese Pectinariidae (Annelida: Polychaeta), including redescriptions of poorly known species, pp. 433-445 in Zootaxa 3895 (3)</i> on pages 441-443, DOI: 10.11646/zootaxa.3895.3.8, <a href="http://zenodo.org/record/231594">http://zenodo.org/record/231594</a&gt