Ophryotrocha labronica labronica La Greca & Bacci, 1962

Paxton, Hannelore & Åkesson, Bertil, 2010, The Ophryotrocha labronica group (Annelida: Dorvilleidae) — with the description of seven new species, Zootaxa 2713, pp. 1-24 : 2-5

Ophryotrocha labronica labronica La Greca & Bacci, 1962

Figure 2 A, B, H; 4D, E; Table 1

Ophryotrocha labronica La Greca & Bacci, 1962: 15 , figs 1–4, 7, 8, 11–16, 18; Pleijel & Eide 1996; Dahlgren et al. 2001; Simonini 2002; Åkesson & Paxton 2005; Heggøy et al. 2007; Simonini et al. 2009; Wiklund et al. 2009. Ophryotrocha labronica labronica: Paxton & Åkesson 2007 , figs 5–8.

Material examined. Type material: Neotype ( SMNH 6422), cultured from specimens collected in the Bay of Naples (Mergellina harbour) Italy, 1965. Other material: Live cultures from same collection.

Diagnosis. Prostomium with short, ovate antennae, palps absent ( Fig. 2 A, B); two eyes medially connected; parapodia uniramous, lacking dorsal and ventral cirri, with dorsal protrusion; supra-acicular simple chaetae and subacicular coarsely serrated falcigers ( Fig. 2 H); pygidium with two cirri, pygidial median stylus absent in adults; up to five dorsal median rosette glands on posterior segments in males, up to three in females; anterior edge of mandibles with 25-28 teeth; maxillae with falcate P1-forceps, bidentate P2-forceps, K-forceps right bidentate, left falcate; gonochoristic; chromosomes 2n = 6; diameter of eggs 120–130 µm; tubular egg masses; released larvae without parapodia, with long pygidial median stylus ( Figs. 4 D, E).

Remarks. For a detailed description see Paxton & Åkesson (2007).

Distribution. Mediterranean and adjacent eastern North Atlantic; South Pacific: Sydney, Australia.

TABLE 1. Comparison between species of the O. labronica group.

Figures

FIGURE 2. SEM images. A, Complete female Ophryotrocha labronica labronica, dorsal view; B, same, ventral view; C, anterior end of Ophryotrocha vellae, sp. nov., dorsal view; D, anterior end of Ophryotrocha macrovifera, sp. nov., ventral view; E, nuchal organ of Ophryotrocha vellae, sp. nov.; F, median parapodia of Ophryotrocha macrovifera, sp. nov.; G, chaetae of same; H, falciger of Ophryotrocha labronica labronica.

FIGURE 4. SEM images. A, Posterior end of Ophryotrocha macrovifera, sp. nov., dorsal view; B, enlargement of same to show rosette glands; C, rosette gland of Ophryotrocha vellae, sp. nov.; D, recently released larva of Ophryotrocha labronica labronica, dorsal view; E, 2 - chaetiger larva of same, ventral view; F, 6 - chaetiger juvenile of Ophryotrocha vellae, sp. nov., dorsal view.