Eunice hawaiensis Treadwell 1906

Eunice hawaiensis Treadwell, 1906

Eunice hawaiensis Treadwell, 1906: 1166–1167, figs. 42–44.

Eunice hawaiiensis.—Fauchald, 1970:206 [note misspelling of species name].

MATERIAL EXAMINED.—Holotype, USNM 5210, Albatross sta 4134, off Hawaii Island, 225–324 fathoms, fine coral and volcanic sand.

COMMENTS ON MATERIAL EXAMINED.—The lower half of the peristomium and first setiger have been sliced off; the cut is indicated by a dashed line in the illustration. The specimen is otherwise in good condition; it is in part covered with a loose mucoid-appearing material and may have been tubicolous in life.

DESCRIPTION.—Holotype incomplete, of unknown sex, with 118 setigers; length 115 mm; maximal width 7 mm at setiger 10; length through setiger 10, 13 mm.

Prostomium (Figure 55a) distinctly shorter and narrower than peristomium, as deep as of peristomium. Prostomial lobes frontally rounded, dorsally slightly inflated; median sulcus deep. Palpal areas set off by frontal, horizontal grooves. Eyes between bases of A-I and A-II, brown. Antennae in shallow horseshoe, evenly spaced; A-I thinner than A-II and A-III. Ceratophores ring-shaped in all antennae, without articulations. Ceratostyles slender and tapering, without articulations. A-I to middle of anterior peristomial ring; A-II to setiger 5; A-III to setiger 8. Peristomium apparently cylindrical, considerably wider than prostomium. Separation between rings barely visible dorsally, indeterminable ventrally; anterior ring ~ of total peristomial length. Peristomial cirri to front edge of peristomium, tapering to slender tips, without articulations.

Maxillary formula 1+1, 8+9, 8+0, 12+12, 1+1 according to Treadwell (1906:1167).

Branchiae (Figure 55b) present, pectinate, distinctly longer than notopodial cirri, not reduced in mid-body region, erect. Branchiae from setiger 3 to 54. Branchiae terminating well before posterior end. Last 4 pairs single filaments; all other branchiae strongly pectinate with up to 30 filaments. Stems strong, erect, tapering, longer than notopodial cirri. Filaments slender, filiform, shorter than notopodial cirri.

Anterior neuropodial acicular lobes distally rounded, somewhat more pointed in last setigers present; aciculae emerging at midline. Pre- and postsetal lobes low, transverse folds. First 3 ventral cirri thick, tapering, becoming basally inflated in branchial region. Inflated bases ovate; narrow tips long, tapering. Postbranchial ventral cirri less distinctly inflated basally, becoming thick and tapering in last setigers present. Notopodial cirri distinctly inflated basally, tapering to slender, digitiform tips, similar in shape, but shorter in postbranchial region. Notopodial cirri without articulations.

Limbate setae long, slender. Pectinate setae (Figure 55e) very short, slender, tapering, flat. One marginal tooth distinctly longer than other teeth, with ~12 very long, slender teeth. Shafts of compound falcigers (Figure 55f) distally inflated, marginally smooth. Appendages long, narrow, with nearly parallel sides and small head, bidentate. Proximal teeth smaller than distal teeth, reduced triangular, directed laterally. Distal teeth erect, tapering. Guards symmetrically sharply pointed with short, slender mucros, marginally serrated. Pseudocompound falcigers and compound spinigers absent. Aciculae (Figure 55c) paired, yellow. Inferior aciculae blunt or truncate, slightly curved. Superior aciculae tapering to blunt tips, straight; cross-sections round. Separation between core and sheath indistinct in both aciculae and subacicular hooks. Subacicular hooks (Figure 55d) yellow, bidentate. Hooks first present from setiger 30, present in all setigers thereafter, always single (except for replacements). Hooks tapering to very small heads. Proximal teeth larger than distal teeth, tapering, directed laterally. Distal teeth very short, thick, sharply tapered. Guards short and truncate.

UNKNOWN MORPHOLOGICAL FEATURES.—Relationship between Mx III and left Mx IV; features associated with far posterior setigers; pygidium and anal cirri.

EXPECTED STATES OF SELECTED UNKNOWN FEATURES.—Mx III long and located behind left Mx II.

CHARACTERS USED IN PREPARATION OF KEY NOT SCORED.—Inappropriate Characters: 22, 56, 58, 59. Unknown Characters: 1, 2, 24, 25, 38, 42, 47, 50, 63.

ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—38,2.