Eunice nesiotes (Chamberlin 1919)

Eunice nesiotes (Chamberlin, 1919)

Leodice nesiotes Chamberlin, 1919a:253–256, pl. 57: figs. 6, 7.

MATERIAL EXAMINED.—Holotype, USNM 19749, Albatross, 1899–1900 (no station indicated), Marshall Islands, 12 fathoms, came up on anchor.

COMMENTS ON MATERIAL EXAMINED.—The holotype has been dried out or exposed to very strong alcohol at one time, so most of notopodial cirri and branchiae are badly distorted.

DESCRIPTION.—Holotype incomplete mature female with large eggs in body cavity of 101 setigers; length 90 mm; maximal width 6 mm; length through setiger 10, 10 mm.

Prostomium (Figure 79a) distinctly shorter and narrower than peristomium, less than as deep as peristomium. Prostomial lobes frontally obliquely truncate, dorsally flattened, tilted laterally; median sulcus shallow, continued as ridge along prostomial midline. Antennae in a horseshoe, with A-I isolated by a gap, similar in thickness. Ceratophores ring-shaped in all antennae, without articulations. Ceratostyles tapering, irregularly articulated with up to 5 long, cylindrical articulations in A-III. A-I to posterior edge of peristomium; A-II to setiger 7; A-III to setiger 10. Peristomium cylindrical, somewhat ribbed dorsally, ventrally folded into several shallow folds. Separation between rings distinct dorsally, and barely visible ventrally; anterior ring of total peristomial length. Peristomial cirri to front edge of peristomium or somewhat beyond, slender and tapering, with 2 long articulations.

Maxillary formula 1+1, 5+6, 6+0, 4+9, and 1+1. Mx III forming part of distal arc with left Mx IV.

Branchiae (Figure 79e) present, pectinate, distinctly longer than notopodial cirri, not reduced in mid-body region, erect. Branchiae from setiger 6 to end of fragment. First 2 branchiae single, short filaments; maximum 14 filaments present. Branchial stems short, tapering. Filaments long, slender.

Neuropodial acicular lobes distally rounded or truncate; aciculae emerging dorsal to midline. Pre- and postsetal lobes low, transverse folds. First 5 ventral cirri thick, tapering. Ventral cirri basally inflated in branchial region. Inflated bases thick, transverse welts; narrow tips very long, distally truncate, digitiform. Notopodial cirri very long, tapering from slightly inflated bases, less dominant in posterior than in anterior setigers. Notopodial cirri without articulations.

Pectinate setae (Figure 79b) coarse, tapering, flat. One marginal tooth slightly longer than other teeth; ~10 coarse teeth present. Shafts of compound falcigers (Figure 79d) slightly inflated, marginally smooth. Appendages slender, bidentate. Both teeth directed laterally. Guards asymmetrically bluntly pointed, with convexity covering proximal teeth; mucros absent. Pseudocompound falcigers and compound spinigers absent. Aciculae paired, black, tapering to bluntly conical tips, straight; cross-sections round. Subacicular hooks (Figure 79c) black, bidentate. Hooks first present from setiger 31, present in all setigers thereafter, always single (except for replacements). Hooks slender. Proximal teeth twice as large as distal teeth, directed laterally.

UNKNOWN MORPHOLOGICAL FEATURES.—All features associated with posterior parapodia; pygidium and anal cirri.

EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEATURES.—None.

CHARACTERS USED IN PREPARATION OF KEY NOT SCORED.—Inappropriate Characters: 56. Unknown Characters: 4, 6, 13,14, 36–38; 40, 42,47, 50, 57–60, 63, 74, 78.

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