Pseudonereis anomala Gravier, 1899

Hadiyanto, Hadiyanto, 2023, Nereididae (Annelida: Phyllodocida) from intertidal macroalgae in Western Australia, Zootaxa 5239 (2), pp. 151-203 : 182-183

Pseudonereis anomala Gravier, 1899

Fig. 17A–F

Pseudonereis anomala Gravier, 1989b: 290–292 , figs 5–9; Day 1967: 333, fig. 14.12.g–j; Hutchings & Turvey 1982: 141–142; Hylleberg et al. 1986: 13–14, fig. 7; Hutchings & Glasby 1985: 108–109; Çinar & Ergen 2005: 316–318, fig. 4A–D; Bakken 2007: 148–152, figs 2–3; Glasby et al. 2013: 259, figs 6A, 7A, B.

Type locality. Djibouti, Gulf of Aden .

Material examined. Western Australia: False Cape Bosut, Bidyadanga , 18°34′18.40″S 121°43′42.87″E, 3 November 2020, 1 specimen ( WAM V11690 ) . Cape Keraudren , 19°57′51.30″S 119°47′16.94″E, 5 November 2020, 1 specimen ( WAM V11691 ) .

Description. Complete specimens with 57–76 chaetigers, body 13.5–37.3 mm long and 1.0–2.0 mm wide; cream yellow in alcohol.

Prostomium as long as wide. Eyes black, two pairs, equal size, in trapezoidal arrangement. Eyes two pairs, equal size. Palps one pair, palpophores globose, palpostyles conical.Antennae one pair, shorter than palps. Tentacular cirri four pairs with basal articulation, longest one extending to chaetiger 3. Pharyngeal jaws black, curved at tips, with eight teeth on each jaw. Paragnaths translucent brown, present on maxillary and oral rings, arranged as follows: Area I= 1–3 cones, Area II= 16–23 p-bars in a triangle, Area III= 32–58 p-bars in 3–4 rows, Area IV= 32–33 p-bars in four curved rows, Area V= 0, Area VI= 5–8 cones in one row, Areas VII–VIII= 12–15 cones in one row ( Fig. 17A ).

Apodous segment as long as first chaetiger. First two chaetigers uniramous. Notopodia present with digitiform dorsal and ventral ligules, dorsal ligules prolonged in posterior chaetigers. Dorsal cirri cirriform, attached on middle of dorsal parapodia, about three times longer than dorsal ligules. Neuropodia with digitiform ventral ligules, acicular ligules, and triangular postchaetal lobes extending below acicular ligule tips. Ventral cirri cirriform, attached basally on ventral parapodia, as long as ventral ligules ( Fig. 17B ).

Notochaetae present with homogomph spinigers ( Fig. 17C ) in anterior chaetigers, homogomph falcigers ( Fig. 17D ) from chaetiger 23–39. Notopodial falcigerous blades medium-sized, with fine serrations. Neurochaetae present with heterogomph falcigers ( Fig. 17E ) and homogomph spinigers in dorsal fascicles, heterogomph spinigers ( Fig. 17F ) and falcigers in ventral fascicles. All spinigerous blades long, with fine serrations. Neuropodial falcigerous blades short, with fine serrations. Acicula black. Pygidium with anus on dorsal side, anal cirri cirriform, as long as last three chaetigers.

Remarks. In specimens collected from Thailand, paragnaths on Area VI are arranged in 1–2 rows ( Hylleberg et al. 1986). The tentacular and anal cirri of our specimens are shorter than those of materials examined by Bakken (2007). Notopodial homogomph falcigers can be present from chaetiger 5 to mid-body ( Glasby et al. 2013), earlier than those of our specimens.

It is noteworthy that the Indonesian species Pseudonereis trimaculata ( Horst, 1924) has been found just to the north of the present specimens in Tranquil Bay (13°56′S 127°18′E) intertidally in a sandy bay with rocky headlands (NTM W19035 ). It can easily be distinguished from P. anomala by the form of paragnaths in Area VI (see key below).

Distribution. Tropical Indian Ocean, Mediterranean Sea, Aegean Sea ( Table 2 ).

Habitat. Intertidal, estuary, subtidal, rocky shores, sand ( Table 2 ).

Figures

FIGURE 17. Pseudonereis anomala Gravier, 1899 (WAM V11690); A, proboscis, ventral dissection; B, parapodium, chaetiger 22, posterior view; C, notochaetae, homogomph spiniger, chaetiger 22; D, notochaetae, homogomph falciger, chaetiger 22; E, neurochaetae, dorsal fascicle, heterogomph falciger, chaetiger 22; F, neurochaetae, ventral fascicle, heterogomph spiniger, chaetiger 32. Scale: A, 0.5 mm; B, 0.1 mm; C–F, 0.01 mm.