Amphictene sp.1
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publication ID |
https://doi.org/ 10.11646/zootaxa.5151.1.1 |
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publication LSID |
lsid:zoobank.org:pub:135CC8D7-CAFA-4B23-9006-AB8613E982A0 |
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persistent identifier |
https://treatment.plazi.org/id/039E87CF-FFE1-FFE1-C39A-FF72BB8AFC35 |
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treatment provided by |
Plazi |
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scientific name |
Amphictene sp.1 |
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Figs 1 View FIGURE 1 & 7 View FIGURE 7 .
Material examined. SCSMBC030872, 1 spec. incomplete with anterior 15 segments, Yellow Sea, 122°20'43.8"E 33°01'00.1"N, 20 m, mud, coll. P. Ni, X Zhong, B. Chou & L. He, Sep 2017, sta. H31. Preserved specimen stained with Rose Bengal.
Description. Preserved specimen width progressively becoming narrower posteriorly ( Fig. 7A–B View FIGURE 7 ). Specimen incomplete with anterior 15 segments, body length 6.5 mm including paleae and scaphe, width 0.8 mm at cephalic regions ( Fig. 7A–B View FIGURE 7 ).
Cephalic veil oval, free from operculum, with 10 smooth cirri on anterior and lateral margins ( Fig. 7C–D View FIGURE 7 ). Pair of ear-shaped lobes adjacent to both sides of dorsal base of cephalic veil. Prostomial buccal tentacles short with deep medial grooves and inserted ventrally to cephalic veil ( Fig. 7C–D View FIGURE 7 ).
Operculum semicircular; dorsal and lateral margins well developed, with two pairs of lateral long cirri and 12 ventral triangular lappets; with 11 pairs of golden paleae, curved dorsally, acute with extended tips; with small median papilla between both rows of paleae ( Fig. 7E View FIGURE 7 ).
Segments 1 and 2 each with pair of tentacular cirri on lateral sides of body, with annuli, second pair larger and inserted more dorsally ( Fig. 7C, E View FIGURE 7 ). Pair of small ventral lappets present ventrally to tentacular cirri, near cephalic veil, on segment 1. Segment 2 with pair of lateral lobes and mid ventral lobes on ventral margin ( Fig. 7C–D View FIGURE 7 ).
Comb-like branchiae present on segments 3–4, 1 st pair larger and inserted more ventrally ( Fig. 7C–E View FIGURE 7 ). Segment 3 with pair of small dorso-lateral pads ( Fig. 7C, E View FIGURE 7 ). Dorso-lateral pads absent on segment 4 ( Fig. 7C, E View FIGURE 7 ). Ventral glandular lobes present on segments 3–6 ( Fig. 7C–D View FIGURE 7 ).
Notopodia other than those of segment 1 which bear paleae, on segments 5–15, each bearing two kinds of notochaetae. Neuropodia on segments 8–15, each with raised torus with a transverse row of uncini; each uncinus with U-shaped anterior peg embedded into torus, several rows of minor teeth, and four longitudinal rows of major teeth, each with 6–8 teeth ( Fig. 7F View FIGURE 7 ).
Scaphe lost. Tube not retained.
Distribution. Southern Yellow Sea ( Fig. 1 View FIGURE 1 ).
Habitat. Muddy sediment in shallow water.
Remarks. The species can be distinguished from other species A. jianqingi n. sp. A. alata Zhang, Zhang & Qiu, 2015 and A. japonica ( Nilsson, 1928) from Chinese waters for specimen of Amphictene sp.1 has 4–5 longitudinal rows of major teeth on uncinus. As we only have a damaged incomplete specimen, we can only identify the animal to genus level and characterize the taxon by the cirri or lappets on the dorsal and lateral margins of the operculum, with the formal description requiring more material to be collected.
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.