Eunice fauveli Gravier 1900

Eunice fauveli Gravier, 1900

Eunice fauveli Gravier, 1900: 236–239, figs. 89–93, pl. 12: fig. 60.

MATERIAL EXAMINED.—Holotype, MNHN, Paris, Obock, Red Sea, coll. J. Jousseaume, 1894.

DESCRIPTION.—Holotype complete, of unknown sex, with 216 setigers; total length 302 mm; maximal width 8 mm at about setiger 20; length through setiger 10, 18 mm; width at setiger 10, 7.5 mm. Body through setiger 10 cylindrical; remainder dorsoventrally flattened with short, crowded, wide segments. Anal cirri as long as last 10 setigers, without articulations.

Prostomium (Figure 44a) distinctly shorter and narrower than peristomium, less than as deep as peristomium. Prostomial lobes frontally rounded, dorsally slightly flattened; median sulcus deep. Eyes on lateral sides of bases of A-II, dark. Antennae in deep horseshoe, evenly spaced, similar in thickness. Ceratophores ring-shaped in all antennae, without articulations. Ceratostyles tapering to relatively slender tips, with up to 7 cylindrical articulations in one A-II. A-I to setiger 1; A-II to setiger 3; A-III to setiger 4 (incomplete). Peristomium cylindrical. Separation between rings distinct dorsally and ventrally; anterior ring ∼ of total peristomial length. Peristomial cirri to anterior of anterior peristomial ring, slender and tapering, without articulations.

Maxillary formula 1+1, 5+5, 6+0, 4+9, and 1+1. Left Mx IV short with reduced teeth, forming a distal arc with Mx III. Mx VI missing. Jaws strongly calcified, rather brittle.

Branchiae (Figure 44b) present, pectinate, distinctly longer than notopodial cirri, not reduced in mid-body region, erect. Branchiae from setiger 18 to setiger 216. Branchiae present to near posterior end, more than 65% of total number of setigers. First branchiae single filaments; maximum 14 filaments from about setiger 35. First 5–6 pairs shorter than notopodial cirri; all other branchiae, including last ones, clearly longer than notopodial cirri. Stems slender, tapering, longer than notopodial cirri. Filaments slender, nearly filiform, longer than notopodial cirri. Branchiae increasingly conspicuous towards posterior end.

Neuropodial acicular lobes distally truncately rounded, becoming slightly conical near posterior end; aciculae emerging at midline. Presetal lobes low, transverse folds. Postsetal lobes higher than acicular lobes and rounded in first 20 setigers, becoming low, transverse folds by setiger 25. First 9 ventral cirri tapering. Ventral cirri becoming modestly basally inflated from about setiger 10. Inflated bases ovate; narrow tips tapering. Inflated bases decreasing in importance posteriorly. From about setiger 100 ventral cirri tapering. Anterior notopodial cirri slender, basally distinctly inflated, with 3–4 articulations. Articulations are lost by first branchial segments; basally inflations and slender, tapering tips retained in all setigers.

Limbate setae slender, marginally smooth. Pectinate setae (Figure 44e) tapering, furled. One marginal tooth longer than all other teeth, with ∼16 teeth. Shafts of compound falcigers (Figure 44b) very gently inflated, or tapering without inflated region, marginally smooth; internal striations present; beaks distinct. Appendages rather large, tapering, with large, distinct heads and distinct basal bosses, bidentate. Teeth similar in size, tapering. Proximal teeth directed slightly distally. Distal teeth nearly erect. Guards symmetrically bluntly pointed, rarely with very short mucros, marginally frayed. Pseudocompound falcigers and compound spinigers absent. Aciculae mostly single, rarely paired in posterior setigers, brown, deepening to dark brown in posterior setigers, tapering, distally straight, blunt; cross-section round. Subacicular hooks (Figure 44d) light to medium brown, bidentate. Hooks first present from setiger 41, present in all setigers thereafter, always single (except for replacements). Hooks tapering to small heads. Teeth small. Proximal teeth larger than distal teeth, directed laterally. Distal teeth directed obliquely distally.

UNKNOWN MORPHOLOGICAL FEATURES.—Pygidium and anal cirri.

EXPECTED STATE OF SELECTED UNKNOWN FEATURES.—None.

CHARACTERS USED IN PREPARATION OF KEY NOT SCORED.—Inappropriate Characters: 56, 58, 59. Unknown Characters: 74,78.

ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—None.