Paramaldane glandicincta, Wang, Yueyun & Li, Xinzheng, 2016

Wang, Yueyun & Li, Xinzheng, 2016, A new Maldane species and a new Maldaninae genus and species (Maldanidae, Annelida) from coastal waters of China, ZooKeys 603, pp. 1-16 : 2-3

Taxon classification Animalia Capitellida Maldanidae

Paramaldane glandicincta sp. n. Figs 1, 2

Type material examined.

Holotype: MBM 008120, complete. Original label: South China Sea, Station 6175, mud sediment, 141 m, 28 January 1959. Paratypes: MBM 008130, 1 complete specimen, Southeast of Hainan Island, 18°30'N, 110°45'E. Original label: South China Sea, Station 6156, mud sediment, 100 m, 8 March 1960; MBM 008214, two incomplete specimens, posterior part lost, Southeast of Hainan Island, 18°30'N, 110°30'E. Original label: South China Sea, Station 6143, mud sediment, 122.5 m, 22 April 1959.

Type locality.

China, south of Hainan Island, 17°30'N, 110°00'E, 28 January 1959.

Diagnosis.

Complete specimen with 19 chaetigers and two preanal achaetigerous segments. Cephalic plate rounded. Cephalic rim with two lateral creases, margin of the rim almost smooth. Anterior chaetigers biannulate. Sixth chaetiger with thick, collar-like glandular band. Rim of anal plate with deep lateral notches,ventral margin of anal rim crenulate, dorsal margin smooth.

Description.

Holotype complete, 43 mm long, and 2.0 mm wide at the third chaetiger. Paratype of MBM 008130 complete, 74 mm long and 2.5 mm wide. Body cylindrical with 19 chaetigers, two preanal achaetigerous segments, and pygidium. First chaetiger without neurochaetae. Anterior part of the sixth chaetiger with thick glandular band forming a low collar and overlapping posterior part of the fifth chaetiger (Figs 1A, F; 2 C–E).

Cephalic plate obliquely truncated, edge almost circular (Fig. 1B, C). Cephalic rim smooth (Fig. 1C), with a pair of shallow lateral creases (Fig. 1B). Deep furrow from lateral crease runs backward on peristomium to front edge of first chaetiger. Margin of posterior part of cephalic rim very weakly undulating (Fig. 1B, C). Anterior parts of rim completely smooth, and fused with prostomial palpode. Prostomial palpode indistinct, smoothly circular. Cephalic keel short and slightly arched. Nuchal grooves short, slightly curved, isolated from cephalic rim (Fig. 1B).

First four chaetigers completely biannulate, each comprising an achaetigerous and chaetigerous annulus. First six chaetigers short, following chaetigers elongated. Epidermal glands developed well on chaetigers 1-6. Glands only present on parapodial tori of following segments.Thick glandular band resembling a collar located on anterior part of sixth chaetiger, covering rear of fifth chaetiger, divided into dorsal and ventral parts by two lateral slits (Figs 1F, 2C). Dorsal margin of glandular band smooth (Fig. 2E). A small notch on ventral median line of ventral glandular band (Figs 1A, 2D).

Neurochaetae beginning to present on second chaetiger, with many small teeth on main fang (Figs 1G, 2H, I). Anterior chaetigers with simple capillary notochaetae. Middle and posterior chaetigers with long spirally-fringed notochaetae and short companion notochaetae (Fig. 2J). Long notochaetae with spinose spiral bands imbricated over main shaft (Figs 1H, 2M). Short companion chaetae two kinds: geniculate and capillary chaetae (Figs 1I, J, 2K). Geniculate companion chaetae with a long whip-like tip (Fig. 2K); transitional part smooth and thicker than shaft (Fig. 2L).

Two preanal achaetigerous segments marked by parapodial rudiments (Figs 1D, 2F, G). First achaetigerous segment longer than last one. Anus on dorsal side with a flaplike anal valve (Figs 1D, 2F). Pygidium forming a flat anal plate with a pair of deep lateral notches (Fig. 2F). Ventral part of the anal rim with 7-8 conspicuous crenulations (Fig. 1E). Dorsal rim smooth to slightly crenulated.

Etymology.

The specific name glandicincta is a combination of glans and cinctus (meaning "belt", feminine form cincta), refering to the characteristic glandular belt on the six chaetiger.

Remarks.

Paramaldane glandicincta sp. n. is characterised by a collar-like glandular band on the anterior margin of the sixth chaetiger.