Neanthes jihueiensis, Hsueh, 2019

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 : 179-180

publication ID

https://doi.org/10.11646/zootaxa.4554.1.5

publication LSID

lsid:zoobank.org:pub:682FE7E7-26D7-4A12-8424-942836D0585E

DOI

https://doi.org/10.5281/zenodo.5924665

persistent identifier

https://treatment.plazi.org/id/03CE8794-FFC9-454A-FF18-FB82FDB4F86F

treatment provided by

Plazi

scientific name

Neanthes jihueiensis
status

n. sp.

Neanthes jihueiensis n. sp.

Figs 5A – G View FIGURE 5 , 6A – E View FIGURE 6 , Table 2

Material examined. Holotype ( NMNS 7946-016 View Materials ), Jihuei (23°06.86´N 121°24.18´E), Taitung County, Taiwan, rocky intertidal hard bottom, 28 April 2017 GoogleMaps . Paratype: 1 specimen ( NMNS 7946-017 View Materials ), collection location and habitat information same as holotype, 29 April 2017 .

Description. Holotype, incomplete, posterior end missing, remaining body length 94.5 mm (45.5) with 121 (86) chaetigers, maximum width 2.5 mm (1.5) at chaetiger 5 (6), excluding parapodia; brown to beige in alcohol ( Fig. 5A View FIGURE 5 ). Prostomium wider than long, one pair antennae arise antero-laterally, palpophores spherical and biarticulate with sub-conical palpostyles, four pairs of tentacular cirri, longest posterior tentacular cirri reaching chaetiger 4 ( Fig. 5B View FIGURE 5 ). Two pairs of black eyes, in trapezoidal arrangement, subequal in size. One apodous anterior segment present, about 1.2 times as long as chaetiger 1. Pharynx with dark brown jaws, each with 4 lateral teeth; brown to dark conical paragnaths as: I=3 (2), in a triangle (in longitudinal line with 2); II=8 (11) (left), 12 (13) (right), in 2 oblique rows; III=15 (18), in 2–3 transverse rows; IV=28 (23) (left), 34 (25) (right), in 4–5 oblique rows; V=3, in a triangle ( Fig. 5C View FIGURE 5 ); VI=2 (3) (left), 3 (right), in a transverse row; VII/VIII=18 (27), in 2–3 rows.

Notopodial dorsal ligules rounded on anterior chaetigers, narrowed triangular with a pointed tip on posterior chaetigers ( Fig. 5 View FIGURE 5 D–G). Dorsal cirri basally attached to dorsal ligule on anterior chaetigers, mid-dorsally attached to dorsal ligule on posterior chaetigers; about as long as dorsal ligule on anterior chaetigers, shorter than dorsal ligule on posterior chaetigers ( Fig. 5 View FIGURE 5 D–G). Notopodial ventral ligule conical on anterior chaetigers, narrowed triangular with a blunt tip on posterior chaetigers. Neuropodium with prominent inferior lobe and less developed superior lobe on anterior chaetigers, both lobes less developed on posterior chaetigers. Neuropodial postchaetal lobe absent. Neuropodial ventral ligule conical on anterior chaetigers, narrowed triangular with a pointed tip on posterior chaetigers; ventral cirri mid-ventrally attached to ventral edge of parapodia, shorter than ventral ligule ( Fig. 5 View FIGURE 5 D–G).

Notochaetae present from chaetiger 3 to posterior chaetigers, homogomph spinigers ( Fig. 6A View FIGURE 6 ). Neurochaetae dorsal fascicle: homogomph spinigers ( Fig. 6B View FIGURE 6 ), and heterogomph falcigers with medium-length, serrated terminal blade ( Fig. 6C View FIGURE 6 ). Neurochaetae ventral fascicle: heterogomph spinigers ( Fig. 6D View FIGURE 6 ), and heterogomph falcigers with medium-length, serrated terminal blade ( Fig. 6E View FIGURE 6 ). Pygidium not observed.

Etymology. The name is derived from the name of a coastal village, Jihuei, where the worm was collected.

Type locality. Jihuei , Taitung County, Taiwan .

Distribution. Only known from the type locality.

Remarks. Neanthes jihueiensis n. sp. has 3 conical paragnaths on Area V of the pharynx, which is also seen in N. donghaiensis and N. vitabunda reported from China and Philippines, respectively ( Pflugfelder 1933: 72, fig. 12b; Wu et al. 1981: 132; Table 2). Neanthes jihueiensis n. sp., however, is readily distinguished from the latter two species by having neuropodial heterogomph falcigers with medium-length terminal blade, whereas that of the latter two species is long terminal blade ( Pflugfelder 1933: 72, fig. 12d; Wu et al. 1981: 133, fig. 82H; Fig. 6C, E View FIGURE 6 ). Of the nine species reported in the present study, two have 3 conical paragnaths on Area V of the pharynx as in N. jihueiensis n. sp.: N. babuzai n. sp. (n=18) and N. kinmenensis n. sp. (n=2) ( Table 2). Neanthes jihueiensis n. sp., however, differs from these two species by having fewer conical paragnaths on Area VII/VIII (18–27 versus 35 and up) and neuropodial heterogomph falcigers with a medium-length terminal blade (versus a long terminal blade) ( Figs 2C, E View FIGURE 2 , 6C, E View FIGURE 6 , 10C, E View FIGURE 10 ; Table 2).

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Phyllodocida

Family

Nereididae

Genus

Neanthes