Amphictene japonica ( Nilsson, 1928 ), Nilsson, 1928

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, Zootaxa 3895 (3), pp. 433-445: 435

publication ID

http://dx.doi.org/10.11646/zootaxa.3895.3.8

publication LSID

lsid:zoobank.org:pub:21C2567F-8E60-40B5-BD68-A79AFEC8C5A3

persistent identifier

http://treatment.plazi.org/id/03C5AC3E-FFDE-8261-E3E8-55E8FB781B6B

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Plazi

scientific name

Amphictene japonica ( Nilsson, 1928 )
status

 

Amphictene japonica ( Nilsson, 1928)  

[new Japanese name: Nihon-umi-isagomushi] ( Figs 2–3 View FIGURE 2 View FIGURE 3 )

Pectinaria (Amphictene) japonica Nilsson, 1928: 52   .

Amphictene japonica: Okuda (1934, 321)   ; Imajima & Hartman (1964, 327).

Material examined. CBM-ZW 497, 1 specimen, Incheon, Songdo, North Korea, 26 August, 1987. ZIHU Shiro Okuda’s Collection, “ Pectinaria japonica   ”, 6 specimens (3 complete, 3 separated into two or three parts), 1932, Choshi, Chiba Prefecture (see Fig. 1), coll. Mr. K. Ose.

Description. Body length 55.0 mm including scaphe, width 5.0 mm at cephalic region. Crown (operculum) with 12 paleae on each side. Paleae stout, flattened golden bristles, tapering to curved pointed tip ( Fig. 3 View FIGURE 3 A –C). Cephalic membrane (cephalic veil) damaged and poorly preserved. Raised cephalic rim with 26 marginal papillae ( Fig. 3 View FIGURE 3 B, C).

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. 3 View FIGURE 3 B). Segment II with small posterodorsal ear-lobe (lappet) on base of tentacular cirri ( Fig. 3 View FIGURE 3 B). Venter of segments III –IV slightly glandular and smooth. First chaetiger (segment V) with an anteroventral lobe and a small ear-lobe situated on ventral side of chaetal tuft ( Fig. 3 View FIGURE 3 A, B). Second chaetiger (segment VI) with anteroventral lobe, anterior margin nearly smooth ( Fig. 3 View FIGURE 3 B).

Comb-like branchiae present on segments III –IV, each consisting of a series of loose, flat lamellae ( Fig. 3 View FIGURE 3 A, B). Large subquadrate glandular flaps (lobes) present ventrally at base of second pair of branchiae on segment IV ( Fig. 3 View FIGURE 3 A, B). Glandular median plate (ventral shield) on segments III –IV ( Fig. 3 View FIGURE 3 A). Dorsal chaetigers 16 pairs (on segments V –XX), 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. Uncinigerous tori 13 pairs (on segments VIII –XX); uncini with 8 major teeth in lateral view, 6–7 minute teeth ( Fig. 3 View FIGURE 3 E). Scaphe ovoidal, flattened dorsally, broadly divided into 2–3 lobes on each lateral margin by shallow notches, each lobe with small cirriform papillae ( Fig. 3 View FIGURE 3 D). Free end of scaphe with spatulate valve. Scaphal hooks 21–22 pairs, straight and slightly bending near tip. Tube not retained with specimen.

Taxonomic remarks. Amphictene japonica   specimens of Shiro Okuda’s collection have been dried and subsequently placed in ethanol and are thus poorly preserved and in a poor condition ( Fig. 2 View FIGURE 2 B). According to the label ( Fig. 2 View FIGURE 2 A), Okuda’s description is based on those six specimens (1934: p. 323–324).

Amphictene japonica   can be distinguished from other Japanese pectinariid species by the cephalic rim having marginal papillae and by presence of a large number of scaphal hooks (usually more than 20 pairs).

ZIHU

Zoological Institute, Hokkaido University

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Terebellida

Family

Pectinariidae

Genus

Amphictene

Loc

Amphictene japonica ( Nilsson, 1928 )

Nishi, Eijiroh, Matsuo, Kanako, Kazama-Wakabayashi, Maki, Mori, Atsushi, Tomioka, Shinri, Kajihara, Hiroshi, Hamaguchi, Masami, Kajihara, Naoto & Hutchings, Pat 2014
2014
Loc

Pectinaria (Amphictene) japonica

Nilsson 1928: 52
1928