Perinereis variodentata ( Augener, 1913 )

Hadiyanto, Hadiyanto, 2023, Nereididae (Annelida: Phyllodocida) from intertidal macroalgae in Western Australia, Zootaxa 5239 (2), pp. 151-203 : 175-176

Perinereis variodentata ( Augener, 1913)

Figs 13A–F , 20C–D

Nereis (Perinereis) variodentata Augener, 1913: 179–182 , fig. 19a–c, pl.3, fig. 50u.

Perinereis variodentata .— Kott 1951: 112–113, fig. 6a–d; Hartman 1954: 35; Hutchings & Turvey 1982: 140–141; HartmannSchröder 1983: 139; Hartmann-Schröder 1984: 29; Hutchings et al. 1991: 266–268, fig. 18a–c.

Type locality. Albany , Western Australia .

Material examined. Western Australia: Horrock , 28°23′23.32″S 114°25′48.98″E, 18 November 2020, 1 specimen ( WAM V11666 ) . Ellensbrook Beach , 33°54′25.59″S 114°59′16.29″E, 24 July 2016, 3 specimens ( WAM V11667 ) .

Comparative material. Perinereis variodentata , det. C. Glasby, Taylor Street Marina, Esperance , Western Australia, 33°51′S 121°55′E, coll. Mulligan, 17 March 2002, 2 ( NTM W18369 ) .

Description. Complete specimens with 66–75 chaetigers, body 22.1–36.0 mm long and 1.8–2.9 mm wide; cream yellow in alcohol. An incomplete specimen with 39 chaetigers, posterior end missing, remaining body 8.2 long and 1.1 mm wide; cream yellow in alcohol.

Prostomium as long as wide. Eyes black, two pairs, equal sizes, in trapezoidal arrangement. Palps one pair, palpophores globose, palpostyles conical. Antennae one pair, shorter than palps. Tentacular cirri four pairs with basal articulation, longest ones extending to chaetiger 6–9. Pharyngeal jaws reddish brown, curved at tips, with eight teeth on each jaw. Paragnaths reddish black, present on maxillary and oral rings, arranged as follows: Area I= 8 cones of two sizes, Area II= 7 cones in two oblique rows, Area III= 8 cones in two rows, Area IV= 12–13 cones in two oblique rows, Area V= 6 cones in two curved rows, Area VI= two long transverse bars in one row, Areas VII–VIII= 64–84 cones in 1–3 rows at lateral and 6 rows at ventral ( Figs 13A–B , 20C–D ).

Apodous segment as long as first chaetiger. First two chaetigers uniramous. Notopodia present with subconical dorsal and ventral ligules in anterior chaetigers, those ligules become digitiform in posterior chaetigers. Dorsal cirri cirriform, attached on middle of dorsal parapodia, twice longer than dorsal ligules, similar length throughout chaetigers. Neuropodia with subconical ventral ligules, acicular ligules, and triangular postchaetal lobes extending to same level of acicular ligule tips; ventral ligules become digitiform in posterior chaetigers. Ventral cirri cirriform, attached basally on ventral parapodia, as long as ventral ligules ( Fig. 13C ).

Notochaetae present with homogomph spinigers ( Fig. 13D ). Neurochaetae present with homogomph spinigers and heterogomph falcigers in dorsal fascicles, heterogomph spinigers ( Fig. 13E ) and falcigers ( Fig. 13F ) in ventral fascicles. All spinigerous blades short, with fine serrations. Falcigerous blades short, curved at tips, with fine serrations. Acicula black. Pygidium with anus on dorsal side, with slender anal cirri, as long as last five chaetigers.

Remarks. In our specimens, Area III has more paragnaths than that of materials examined in the original description (2) ( Augener 1913) and previous studies (1–6) ( Kott 1951; Hartman 1954; Hutchings & Turvey 1982; Hutchings et al. 1991). Area IV is sometimes present with 1–2 bars in additional to cones, and the lateral cones in the inner cluster of Area V almost contact Area VI ( Hartmann-Schröder 1984; Hutchings et al. 1991). Augener (1913) found homogomph falcigers in the dorsal fascicles of neurochaetae, but we and other studies ( Kott 1951; Hutchings & Turvey 1982; Hutchings et al. 1991) did not find them.

Distribution. Temperate Australia:South-West Australia, New South Wales, South Australia, Tasmania ( Table 2 ).

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

Figures

FIGURE 13. Perinereis variodentata (Augener, 1913) (WAM V11666); A, head, dorsal view; B, head, ventral view; C, parapodium, chaetiger 39, anterior view; D, notochaetae, homogomph spiniger, chaetiger 39; E, neurochaetae, ventral fascicle, heterogomph spiniger, chaetiger 39; F, neurochaetae, ventral fascicle, heterogomph falciger, chaetiger 39. Scale: A–B, 0.5 mm; C, 0.05 mm; D–F, 0.02 mm.

FIGURE 20. Comparative material from Western Australia and the Northern Territory sourced from the Museum & Art Gallery of the Northern Territory. Perinereis helleri (Grube, 1878) (NTM W19020; 2.0 mm wide at chaetiger 1): A, head, dorsal view; B, head, ventral view. Perinereis variodentata (Augener, 1913) (NTM W18369; 1.8 mm wide at chaetiger 1): C, anterior segments, dorsal view; D, proboscis, ventral dissection. Platynereis polyscalma Chamberlin, 1919 (NTM W19031; 2.8 mm wide at chaetiger 1): E, anterior segments, dorsal view; F, proboscis, ventral dissection. Platynereis uniseris Hutchings & Reid, 1991 (NTM W19003; 1.4 mm wide at chaetiger 1): A, anterior segments, dorsal view; B, proboscis, ventral dissection.