Neanthes kaomeiensis, 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 : 181-182

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.5924671

persistent identifier

https://treatment.plazi.org/id/03CE8794-FFC7-4547-FF18-FA51FCE6FDD2

treatment provided by

Plazi

scientific name

Neanthes kaomeiensis
status

n. sp.

Neanthes kaomeiensis n. sp.

Figs 7A – K View FIGURE 7 , 8A – D View FIGURE 8 , Table 2

Material examined. Holotype ( NMNS 7946-022 View Materials ), Kaomei (24°18.9´N 120°32.68´E), Taichung City, Taiwan, intertidal soft bottom, 22 October 2005 GoogleMaps . Paratypes: 4 specimens ( NMNS 7946-023 View Materials 026 View Materials ), collection location, habitat and date information same as holotype .

Description. Holotype, incomplete, posterior end missing, remaining body length 18.0 mm (6.0-22.5) with 57 (22–87) chaetigers, maximum width 2.0 mm (1.0) on chaetiger 7, excluding parapodia; beige in alcohol ( Fig. 7A View FIGURE 7 ). 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 8 (7–9, n=3) ( Fig. 7B View FIGURE 7 ). Two pairs of black eyes, in trapezoidal arrangement, subequal in size. One apodous anterior segment present, about 1.1 times as long as chaetiger 1. Pharynx with light brown jaws, each jaw with 6 (4–5, n=1) lateral teeth; light brown conical paragnaths as: I=6 (7, n=1, sample size of Areas II to VIII same as Area I), in a cluster; II=12 (9) (left), 12 (10) (right), in crescentic rows; III=36 (30), in 3–4 transvers rows; IV=11 (8) (left), 12 (8) (right), in 2–3 crescentic rows; V=0; VI=1 (left), 1 (right); VII/VIII=0 ( Fig. 7B, C View FIGURE 7 ).

Notopodial dorsal ligule narrowed triangular with a pointed tip throughout ( Fig. 7 View FIGURE 7 D–G). Dorsal cirri basally attached to dorsal ligule throughout, shorter than dorsal ligule throughout ( Fig. 7 View FIGURE 7 D–G). Notopodial prechaetal lobe present on chaetiger 3 to 24, cirriform, about 2/3 as long as notopodial ventral ligule ( Fig. 7D, E View FIGURE 7 ). Notopodial ventral ligule narrowed triangular throughout. Neuropodium with prominent inferior and superior lobes on anterior chaetigers, both lobes elongated projecting beyond neuropodial postchaetal lobe. Notopodial postchaetal lobe present, triangular with a pointed tip on anterior chaetigers, digitiform on posterior chaetigers. Neuropodial ventral ligule narrowed triangular on anterior chaetigers, less developing on posterior chaetigers; ventral cirri basally attached to parapodia, shorter than ventral ligule throughout ( Fig. 7 View FIGURE 7 D–G).

Notochaetae present from chaetiger 3 to posterior chaetigers, homogomph spinigers ( Fig. 8A View FIGURE 8 ). Neurochaetae dorsal fascicle: homogomph spinigers ( Fig. 8B View FIGURE 8 ). Neurochaetae ventral fascicle: sesquigomph spinigers ( Fig. 8C View FIGURE 8 ), and sesquigomph falcigers with long, serrated terminal blade ( Fig. 8D View FIGURE 8 ). Pygidium round, one pair of filamentous anal cirri attached ventrally, extending 18 chaetigers.

Etymology. The name is derived from the name of nearby village, Kaomei, where the worm was collected.

Type locality. Kaomei , Taichung City, Taiwan .

Distribution. Only known from the type locality.

Remarks. Of the 22 Neanthes species reported from East and Southeast Asia, N. glandicincta and N. wilsonchani are two only species similar to N. kaomeiensis n. sp., which have 0 & 1 conical paragnath on Areas V & VI of the pharynx, respectively and the presence of a prechaetal lobe on anterior chaetigers ( Southern 1921: 590–591, text-fig. 5b–e, pl. XXIII, fig. 9A, C; Lee & Glasby 2015: 82, 85; Fig. 7D, E View FIGURE 7 ; Table 2). However, N. kaomeiensis n. sp. can be readily distinguished from N. glandicincta by the following characters: 1) the length ratio of the peristomium to chaetiger 1, 2) the length of the longest posterior tentacular cirri, 3) numbers of lateral teeth on jaws, 4) numbers of conical paragnaths on Areas III & VII/III, and 5) number of chaetigers with a notopodial prechaetal lobe and length of pygidial cirri. The length ratio of the peristomium to chaetiger 1 in N. kaomeiensis sp. nov. is about 1.1 ( Table 2), whereas that of N. glandicincta exceeds 2.0 ( Southern 1921: pl. XXIII, fig. 9A). The longest posterior tentacular cirri of N. kaomeiensis n. sp. reach to chaetiger 8~9 ( Table 2), but that of N. glandicincta reaches to chaetiger 3 ( Southern 1921: 590). Neanthes kaomeiensis n. sp. has fewer lateral teeth on jaws than N. glandicincta (4–6 versus 15–16) ( Southern 1921: 590; Table 2). Numbers of conical paragnaths on Areas III & VII/III of the pharynx in N. kaomeiensis n. sp. are 30–36 & 0, respectively ( Table 2), but that of N. glandicincta is 50 & 7, respectively ( Southern 1921: 590). Neanthes kaomeiensis n. sp. has prechaetal lobes on chaetiger 3 to 24, whereas N. glandicincta has prechaetal lobes on chaetiger 3 to 100+ ( Southern 1921: 591–592, text-fig. 5b–e, pl. XXIII, fig. 9H, G). Neanthes kaomeiensis n. sp. differs from N. wilsonchani by having greater numbers of conical paragnaths on Areas I & III of the pharynx (6–7 & 3 0–36 versus 0–4 & 6–7, respectively) ( Lee & Glasby 2015: 85; Table 2). Moreover, N. kaomeiensis n. sp. has prechaetal lobes only on chaetiger 3 to 24, but that of N. wilsonchani are found on anterior to posterior chaetigers ( Lee & Glasby 2015: 89). Lastly, N. kaomeiensis n. sp. is the only species of the nine species reported in the present study that has neuropodial sesquigomph spinigers and long sesquigomph falcigers ( Fig. 8C, D View FIGURE 8 ; Table 2). Neanthes glandicincta reported from Taiwan by Wu (1967) was not encountered in the present study.

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Phyllodocida

Family

Nereididae

Genus

Neanthes