Nicidion samoae (Hartmann-Schröder 1965)

Eunice samoae Hartmann-Schröder, 1965

Eunice mutilata samoae Hartmann-Schröder, 1965a: 134–135.

MATERIAL EXAMINED.—Holotype ZMH P 14272, Samoa, Tutuila, Matu'u Bay, 21–23 Oct 1959, algae on edge of fringing reef, coll. G. Hartmann and G. Hartmann-Schröder.

DESCRIPTION.—Holotype incomplete with 128 setigers; length 50 mm; maximal width 4 mm at setiger 15; length through setiger 10, 5 mm.

Prostomium (Figure 100a) distinctly shorter and narrower than peristomium, as deep as of peristomium. Prostomial lobes frontally obliquely truncate; dorsal surface flattened; median sulcus deep. Eyes not seen. Antennae in a horseshoe, evenly spaced, similar in thickness. Ceratophores ring-shaped in all antennae, without articulations. Ceratostyles medially inflated, thick and digitiform, with up to 5 cylindrical, indistinctly marked articulations in A-III. A-I to posterior peristomial ring; A-II to setiger 2; A-III to setiger 4. Peristomium flaring anteriorly. Separation between rings distinct on all sides; anterior ring ~ of total peristomial length. Peristomial cirri to middle of anterior peristomial ring, medially inflated, without articulations.

Maxillary formula 1+1,5+4,6+0,9+10, and 1+1. Mx III part of distal arc with left Mx IV.

Branchiae (Figure 100d) present, pectinate, distinctly longer than notopodial cirri, not reduced in mid-body region, erect. Branchiae from setiger 6 to setiger 51. Branchiae terminating well before posterior end, present on less than 55% of total number of setigers. First 2 and last 10 pairs single filaments; other branchiae pectinate with maximum 6 filaments at setiger 15. Filaments thick with abruptly tapering, narrow tips, about as long as notopodial cirri.

Anterior neuropodial acicular lobes rounded, becoming triangular in far posterior setigers (Figure 100e); aciculae emerging above midline. Presetal lobes low, transverse folds. Postsetal lobes free, rounded lobes in first 30–35 setigers, outreaching acicular lobes in first 30 setigers. Median postsetal lobes follow outline of acicular lobes closely. Posterior postsetal lobes low, transverse folds. First 5 ventral cirri thick and tapering. Ventral cirri basally inflated from setiger 6 through setiger 40. Inflated base large, transverse welts; narrow tips tapering. Posterior ventral cirri thick and tapering and about as long as notopodial cirri, but distinctly thicker. All notopodial cirri thick, basally inflated, without articulations.

Limbate setae slender, marginally smooth. Anterior pectinate setae (Figure 100c) furled, slightly flaring. One marginal tooth distinctly longer than other teeth; ~15 teeth present. Posterior pectinate setae (Figure 100f) slightly less furled, distinctly more flared. One marginal tooth longer than other teeth; ~20 teeth present. Shafts of compound falcigers (Figure 100b,g) distinctly inflated, marginally serrated; beak distinct. All appendages similar in size, triangular with distinct heads, bidentate. Proximal teeth narrow, slender, directed or curved slightly distally. Distal teeth distinctly larger than proximal teeth, gently curved. All guards symmetrically bluntly pointed, nearly rounded; mucros absent. Pseudocompound falcigers and compound spinigers absent. Aciculae single or paired, dark brown, tapering, nearly straight, blunt-tipped; cross-sections round. Separation between core and sheath indistinct in aciculae. Subacicular hooks (Figure 100h) with dark brown cores and clear sheaths, bidentate. Hooks first present from setiger 26, present in all setigers thereafter, always single (except for replacements). Hooks tapering, slightly bent. Proximal teeth larger than distal teeth; both teeth directed distally.

UNKNOWN MORPHOLOGICAL FEATURES.—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: 1,2,6,13,14.

ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—None.