Eunice pauroneurata (Chamberlin 1919)

Eunice pauroneurata (Chamberlin, 1919)

Leodice pauroneurata Chamberlin, 1919a:249–253, pl. 57: figs. 8–9, pl. 58: figs. 1–9, pl. 59: figs. 1–3.

MATERIAL EXAMINED.—Holotype, USNM 19756, Albatross sta 3401, off Galapagos Islands, 0°59′S, 88°58′30″W, 722 m, Globigerina ooze, 28 Mar 1891.

COMMENTS ON MATERIAL EXAMINED.—The holotype has been deeply dissected frontally; the illustration of the anterior end is a partial reconstruction, especially of the outline of the lower lip.

DESCRIPTION.—Holotype incomplete female with 97 setigers; length 42 mm; maximal width 5.5 mm; length through setiger 10,6 mm.

Prostomium (Figure 85d) distinctly shorter and narrower than peristomium, less than as deep as peristomium. Prostomial lobes frontally rounded, dorsally inflated; median sulcus deep. Eyes not observed. Bases of antennae hidden below peristomial fold. Antennae in a horseshoe, evenly spaced, with A-III considerably heavier than other 4. Ceratophores ring-shaped in all antennae, without articulations. Ceratostyles tapering, A-I and A-II with 3 or 4 long cylindrical articulations along distal half. A-I to posterior peristomial ring; A-II to setiger 8; A-III incomplete. Peristomium cylindrical. Separation between rings distinct dorsally and ventrally; anterior ring of total peristomial length. Peristomial cirri to middle of anterior peristomial ring, without articulations.

Maxillary formula 1+1, 7+7, 8+0, ?+8,1+1. Mx III long and located immediately behind left Mx II. Left Mx IV missing.

Branchiae (Figure 85e) present, pectinate, distinctly shorter than notopodial cirri, not reduced in mid-body region, flexible. Branchiae from setiger 8 to end of fragment. First branchiae single filaments; maximum 5 filaments at setiger 15; most segments with 3 or 4 filaments; some with 5 even in last segments present. Branchial stems short, tapering. Filaments digitiform.

Neuropodial acicular lobes distally rounded or truncate; aciculae emerging at midline. Pre- and postsetal lobes low, transverse folds. First 4 ventral cirri thick, tapering. Ventral cirri basally inflated from setiger 5. Inflated bases ovate; narrow tips digitiform. Inflated bases reduced from about setiger 50. By setiger 70–75 ventral cirri short, slender and digitiform. All notopodial cirri prominent, basally inflated, tapering to blunt tips, without articulations.

Pectinate setae (Figure 85h) tapering, flat. One marginal tooth slightly longer than other teeth; ~12 teeth present. Shafts of compound falcigers (Figure 85f) tapering, marginally smooth. Appendages large, with distinct heads, bidentate. Proximal teeth larger than distal teeth, triangular, directed laterally. Distal teeth curved. Guards distally rounded, margin smooth, mucros absent. Pseudocompound falcigers and compound spinigers absent. Aciculae (Figure 85g) paired, dark, sharply pointed, straight or gently curved; cross-section round. Subacicular hooks (Figure 85i) dark, bidentate. Hooks first present from setiger 27, present in all setigers thereafter, always single (except for replacements). Hooks slender, tapering. Proximal teeth about twice as large as distal teeth. Both teeth directed distally.

UNKNOWN MORPHOLOGICAL FEATURES.—All characters associated with far posterior setigers, pygidium, and anal cirri.

EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEATURES.—None.

CHARACTERS USED IN PREPARATION OF KEY NOT SCORED.—Inappropriate Characters: 56, 58, 59. Unknown Characters: 1, 2, 4, 6, 13, 14, 23, 36–38, 40, 74, 78.

ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—37,1; 38,1.