Eunice papeetensis (Chamberlin 1919)

Eunice papeetensis (Chamberlin, 1919)

Leodice oliga papeetensis Chamberlin. 1919a:248–249, pl. 55: figs. 8–10, pl. 56: fig. 1.

MATERIAL EXAMINED.—Holotype, USNM 19397, Papeete, Tahiti, intertidal, 9 Nov 1899, Albatross.

DESCRIPTION.—Holotype incomplete with 37 setigers; length 8.5 mm; maximal width 2 mm; length through setiger 10, 2.5 mm.

Prostomium (Figure 83f) distinctly shorter and narrower than peristomium, less than as deep as peristomium. Prostomial lobes frontally rounded, dorsally excavate with a thickened rim; median sulcus shallow. Eyes behind bases of A-I, dark. Antennae in a horseshoe, with A-III isolated by a gap, similar in thickness. Ceratophores ring-shaped in all antennae, without articulations. Ceratostyles tapering, with up to 20 moniliform articulations in A-III. A-I to posterior edge of peristomium; A-II to setiger 8; A-III to setiger 9. Peristomium cylindrical. Separation between rings distinct ventrally and dorsally. Anterior ring of total peristomial length. Peristomial cirri to frontal edge of peristomium, slender, with 6 articulations.

Maxillary formula 1+1, 6+7, 8+0, 7+10, and 1+1. Mx III part of distal arc with left Mx IV.

Branchiae present, palmate, not reduced in mid-body region. Branchiae from setiger 6 to setiger 30 on one side and 33 on other side. Branchiae terminating well before posterior end, present on less than 55% of total number of setigers. First 2 and last 5 pairs single filaments; all other branchiae with 2 or maximally 3 filaments.

Anterior neuropodia distally truncate; median acicular lobes rounded; aciculae emerging at midline. Pre and postsetal lobes low, transverse folds. First 3 ventral cirri thick, tapering. Ventral cirri basally inflated from setiger 4. Inflated bases ovate; narrow tips tapering. Notopodial cirri long, basally inflated. Anterior notopodial cirri with about 5 articulations, with 3 or 4 articulations in posteriormost segments.

Pectinate setae (Figure 83a) small, flaring, flat. One marginal tooth distinctly longer than other, with ~10 teeth present. Shafts of compound falcigers (Figure 83d) distally inflated, marginally serrated. Appendages rather large; head distinct, bidentate. Both teeth well developed, directed laterally. Guards asymmetrically bluntly pointed; mucros absent. Pseudocompound falcigers and compound spinigers absent. Aciculae at least paired, yellow, distally truncate or gently hammer-headed (Figure 83b,e); cross-section round. Separation of cores and sheaths indistinct in both aciculae and subacicular hooks. Subacicular hooks (Figure 83c) yellow, tridentate with teeth in a crest. Hooks first present from setiger 21. Hooks with well-developed, distinct fangs.

UNKNOWN MORPHOLOGICAL FEATURES.—Relationship between Mx III and left Mx IV; pygidium and anal cirri.

EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEATURES.—None.

CHARACTERS USED IN PREPARATION OF KEY NOT SCORED.—Inappropriate Characters: 34, 56. Unknown Characters: 1, 2, 4, 6, 32, 42, 47, 50, 57–60, 63, 81, 82.

ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—None.