Neanthes cf. nanhaiensis Wu, Sun & Yang, 1981

Hsueh, Pan-Wen, 2019, Neanthes (Annelida: Nereididae) from Taiwanese waters, with description of seven new species and one new species record, Zootaxa 4554 (1), pp. 173-198 : 186-188

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Neanthes cf. nanhaiensis Wu, Sun & Yang, 1981


Neanthes cf. nanhaiensis Wu, Sun & Yang, 1981

Figs 11A – F View FIGURE 11 , 12A – F View FIGURE 12 , Table 2

Material examined. Two specimens (NMNS 7946-029), station C2 (25°12.78´N 121°23.5´E), Bali, New Taipei City, Taiwan, subtidal muddy bottom, 9 January 2015.

Description. Incomplete, posterior body missing, remaining body length 15.0 mm (12.0) with 34 (37) chaetigers, maximum width 1.5 mm (1.0) at chaetiger 6 (4), excluding parapodia; beige in alcohol ( Fig. 11A View FIGURE 11 ). Prostomium wider than long, one pair antennae arise antero-laterally; palpophores spherical and biarticulate with sub-conical palpostyles, four pairs of tentacular cirri present. Two pairs of purple red eyes, in trapezoidal arrangement, anterior pair slightly larger than posterior pair. One apodous anterior segment present, about 1.1 times as long as chaetiger 1. Pharynx with brownish jaws, each with 5–6 lateral teeth; dark conical paragnaths as: I=0; II=6 (7) (left), 9 (8) (right), in 2–3 oblique rows; III=3 (1), in a transverse row; IV=9 (7) (left), 13 (8) (right), in a cluster; V=0; VI=0; VII=1; VIII=0 ( Fig. 11A, B View FIGURE 11 ).

Notopodial dorsal ligule digitiform on anterior chaetigers, narrowed triangular with a pointed tip on posterior chaetigers ( Fig. 11 View FIGURE 11 C–F). Dorsal cirri attached basally to dorsal notopodial ligule throughout, about as long as dorsal ligule. Notopodial prechaetal lobe present on chaetiger 3 to 25, about 2/3 as long as notopodial ventral ligule ( Fig. 11C, D View FIGURE 11 ). Notopodial ventral ligule digitiform throughout. Neuropodial postchaetal lobe present, digitiform projecting beyond neuropodial acicular ligule. Neuropodial ventral ligule digitiform; ventral cirri basally attached to base of ventral ligule, shorter than ventral ligule ( Fig. 11 View FIGURE 11 C–F).

Notochaetae present on chaetiger 3 to posterior chaetigers, homogomph spinigers ( Fig. 12A View FIGURE 12 ). Neurochaetae dorsal fascicle: homogomph spinigers ( Fig. 12B View FIGURE 12 ), and heterogomph falcigers with medium-length, serrated terminal blade ( Fig. 12C View FIGURE 12 ). Neurochaetae ventral fascicle: homogomph spinigers ( Fig. 12D View FIGURE 12 ), heterogomph falcigers with medium-length ( Figs. 12C, E View FIGURE 12 ) and long, serrated terminal blade ( Fig. 12F View FIGURE 12 ). Pygidium not observed.

Distribution. South China Sea, northeastern Taiwan Strait.

Remarks. The two specimens examined in the present study are very similar to N. cf. nanhaiensis from China in terms of: 1) number of lateral teeth on jaws, 2) paragnath patterns, 3) the presence/absence of prechaetal lobe on anterior chaetigers, 4) types of notopodial and neuropodial chaetigers. Both species have 5 to 6 lateral teeth on jaws. The paragnath pattern of the present specimens is the same as that of N. cf. nanhaiensis on Areas I, III & V– VIII, with a slightly different in the range of conical paragnath numbers on Areas II & IV ( Table 2). Both species have prechaetal lobes on anterior chaetigers, notopodial and neuropodial homogomph spinigers, medium and long neuropodial heterogomph falcigers ( Wu et al. 1981: 139–140, figs 86A–E, G, H; Figs 11D View FIGURE 11 , 12 View FIGURE 12 A–F). Additionally, both species were collected from subtidal soft bottom habitats ( Wu et al. 1981: 139). Few minor differences between the two are: 1) the present specimens have more slender notopodial and neuropodial ligules than that of N. cf. nanhaiensis , 2) dorsal cirri of the present specimens are about as long as the dorsal ligule, whereas those of N. cf. nanhaiensis are longer than the dorsal ligule ( Wu et al. 1981: 139–140, fig. 86A–E, G, H; Fig. 12 View FIGURE 12 C–F). However, the latter difference may be due to specimen damage as tip of dorsal cirri in the present specimens were broken off during the trawling process.