Eunice armillata (Treadwell 1922)

Eunice armillata (Treadwell, 1922)

Leodice armillata Treadwell, 1922:144–146, figs. 26–29, pl. 3: figs. 14–19.

MATERIAL EXAMINED.—Holotype, AMNH V-1920–1542, Aua or Utile reef, Pago Pago Harbor, Samoa.

DESCRIPTION.—Holotype complete, of unknown sex, with 114 setigers; total length 46 mm; maximal width 2 mm at setiger 15; length through setiger 10, 6 mm; width at setiger 10, 1.75 mm. Anterior body cylindrical, becoming dorsoventrally flattened medially and tapering slowly towards posterior end.

Prostomium (Figure 15a) distinctly shorter than and narrower than peristomium, less than as deep as peristomium. Prostomial lobes frontally rounded, dorsally inflated; median sulcus deep. Eyes not observed. Antennae in a transverse line, evenly spaced, similar in thickness. Ceratophores erect cylinders in all antennae, without articulations. Ceratostyles tapering, with up to 14 moniliform articulations. A-I to posterior peristomial ring; A-II to setiger 2; A-III to setiger 3. Peristomium cylindrical. Separation between rings distinct on all sides; anterior ring of total peristomial length. Peristomial cirri barely outreaching posterior peristomial ring, slender and digitiform, without articulations.

Jaws not examined.

Branchiae (Figure 15e, f) present, pectinate, distinctly longer than notopodial cirri, not reduced in mid-body region, erect. Branchiae from setiger 6 to setiger 109. Branchiae present to near posterior end, present on more than 65% of total number of setigers. First 2 pairs single filaments, thereafter 2 filaments in most setigers to setiger 80; a third, short filament present scattered in a few setigers. From setiger 80, 1 or 2 filaments irregularly scattered in about equal numbers of setigers. Stems short, tapering. Filaments digitiform, longer than notopodial cirri.

Neuropodial acicular lobes truncate with aciculae emerging in upper of lobe. Presetal lobes transverse folds. Anterior postsetal lobes longer than acicular lobes, rounded, reduced to transverse folds from setiger 15. Ventral cirri without basal inflation in 5 anterior setigers; anterior ventral cirri digitiform. Median ventral cirri basally inflated. Bases ovate or nearly spherical, narrow tips tapering. Inflation rapidly reduced from setiger 45 and missing posterior to setiger 60. Posterior ventral cirri without basal inflation, becoming increasingly digitiform. Notopodial cirri digitiform, decreasing somewhat in length posteriorly, with up to 3 indistinct articulations in anterior and median setigers. Far posterior notopodial and ventral cirri similar in length and shape.

Limbate setae longer than all other setae, coarsely limbate, marginally serrated. Pectinate setae (Figure 15b) very small; shafts cylindrical, thick. Blades distally narrowly flaring, flat. Both marginal teeth barely longer than other teeth, with about 10 teeth. Shafts of compound falcigers in anterior setigers (Figure 15c) tapering, serrated, with distal beak. In posterior setigers tapering, without serrations and beaks (Figure 15d). Appendages very short, stocky, bidentate. Proximal teeth slighly shorter than distal teeth, narrowly triangular, directed obliquely distally. Distal teeth tapering, directed laterally, distinctly more curved in posterior than in anterior setigers. Guards asymmetrically bluntly pointed, marginally finely serrated, without mucros. Pseudocompound falcigers and compound spinigers absent. Aciculae paired, yellow, very heavy, distally tapering to sharp tips; inferior aciculae gently curved; cross-section of all aciculae round. Separation of core and sheath indistinct in both aciculae and subacicular hooks. Subacicular hooks yellow, bidentate. Hooks present from setiger 34, present in all setigers thereafter, always single (except for replacements); first several slender, becoming increasingly heavy in posterior setigers, very coarse in far posterior setigers (Figure 15f). Hooks slightly tapering subdistally; heads indistinct. Both teeth similar in size, directed laterally.

UKNOWN MORPHOLOGICAL FEATURES.—Pygidium and anal cirri; jaw apparatus.

EXPECTED STATE OF SELECTED UNKNOWN FEATURES.—Mx III located immediately in front of left Mx IV; forming part of a distal arc.

CHARACTERS USED IN PREPARATION OF KEY NOT SCORED.—Inappropriate Characters: 56, 58, 59. Unknown Characters: 13, 14, 40.

ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—None.