Naineris victoriae Day, 1977

Zhadan, Anna, 2020, Review of Orbiniidae (Annelida, Sedentaria) from Australia, Zootaxa 4860 (4), pp. 451-502 : 481-483

Naineris victoriae Day, 1977

Figure 17

Naineris victoriae Day, 1977: 238–239 , fig. 3k–p.

Material examined. Victoria: Westernport Bay , 38°22’S, 145°32’E, 22.11.1973, depth 9 m, coll. Fisheries & Wildlife (Melbourne), Holotype, AM W.7358; 09.01.1974, depth 12 m, AM W.7359, paratypes, 2 specimens from same location.

Type locality. Westernport Bay , Victoria .

Description. All specimens incomplete, thoracic width 1.7– 2 mm. Body slightly flattened in thorax, cylindrical in abdomen ( Fig. 17A , C–E). Prostomium conical with round tip ( Fig. 17 С– E). Thoracic chaetigers number-

ing 16–20, transition to abdomen indistinct ( Fig. 17A ). Branchiae lost in all specimens, presumably starting from chaetigers 8–9 where scars seen ( Fig. 17D, E ). Thoracic notopodial postchaetal lobes developed from first chaetiger, rapidly increasing in size, from digitate to foliaceous; in abdomen becoming long and narrow ( Fig. 17B , С–E, H, J). Thoracic neuropodial postchaetal lobes mammiform with one podal papillae situated in middle of lobe ( Fig. 17A, B, F, G, H, J ). In holotype neuropodia of chaetiger 14 bearing two podal papillae on one side of worm ( Fig. 17G ). Interramal cirrus developed on last thoracic and abdominal chaetigers; in abdomen becoming longer than neuropodia ( Fig. 17B, J, K ). Abdominal neuropodia simple, triangular with tips forming papillae ( Fig. 17K ). No subpodal flange, subpodal, stomach, or flange papillae. Notopodial chaetae crenulate capillaries; thoracic neuropodia bearing capillaries and thin curved serrated uncini in lower part of anterior row ( Fig. 17F, H, I ). Both rami supported by straight aciculae in abdomen; in neuropodia aciculae emergent, with curved bidentate tips ( Fig. 17J, K, L ).

Distribution. Australia, Victoria.

Habitat. Upper subtidal.

Remarks. Naineris victoriae differs from the other species of the genus by having interramal cirri and projecting bidentate neuropodial aciculae. The other unique characteristic, two podal papillae in the thoracic neuropodia, might be a malformation, as this was only found in one parapodia on one side of one specimen. The specimens studied here are in agreement with the original description.

Figures

FIGURE 17. Naineris victoriae, A–G: stereomicroscope, methylene blue staining; H–L: compound microscope. A–D: AM W.7359, paratype.A. Anterior part of the body, lateral view; B. Posterior thoracic chaetigers, lateral view; C. Thorax, dorso-lateral view; D. Thorax, dorsal view; E–L:AM W.7358, holotype. E. Thorax, dorso-lateral view; F. Neuropodia of chaetigers 2–5; G. Parapodia of chaetigers 14-16; H. Parapodium of chaetiger 6; I. Neurochaetae of parapodium of chaetiger 6; J. Parapodium of chaetiger 19; K. Posterior abdominal parapodium; L. Neuroacicula of posterior abdominal parapodium. a, acicula; br, branchia; cc, crenulated capillaries; fc, forked chaeta; ic; interramal cirrus; ne, neuropodium; no, notopodium; u, uncini.