Leodice gracilicirrata Treadwell 1922

Eunice gracilicirrata (Treadwell, 1922)

Leodice gracilicirrata Treadwell, 1922:149–150, figs. 36–38, pl. 5: figs. 1–8.

Eunice armillata.—Hartman, 1956:282 [not Eunice armillata Treadwell, 1922].

MATERIAL EXAMINED.—Holotype, AMNH IV-1920-1535, Suva Harbor, Fiji.

COMMENTS ON MATERIAL EXAMINED.—The antennae are all bent over and cannot be illustrated as stretched without damage to the specimen; the sizes of the antennae given below are low estimates.

DESCRIPTION.—Holotype complete, of unknown sex, with 323 setigers; length 214 mm; maximal width 2.5 mm at setiger 10; length through setiger 10, 9 mm.

Prostomium (Figure 51a) distinctly shorter and narrower than peristomium, as deep as of the peristomium. Prostomial lobes frontally rounded, dorsally inflated; median sulcus deep. Antennae in shallow horseshoe; A-I and A-II close together, separated by gap from A-III; A-III slimmer than A-I and A-II. Ceratophores ring-shaped in all antennae, without articulations. Ceratostyles tapering, slender, with up to 5 indistinct, long, cylindrical articulations; articulations limited to distal half of styles. A-I to middle of anterior peristomial ring; A-II to setiger 2; A-III to front edge of setiger 4. Peristomium about twice as long as prostomium, cylindrical. Separation between rings distinct dorsally and ventrally and less well marked, but visible also laterally; anterior ring ∼ of total peristomial length. Peristomial cirri to tip of prostomium, slender, with 3 or 4 indistinct articulations.

Jaws not examined.

Branchiae (Figure 51f) present, pectinate, distinctly longer than notopodial cirri, not reduced in mid-body region, erect. Branchiae from setiger 3 to setiger 181. Branchiae terminating well before posterior end, present on less than 55% of total number of setigers. First 2 pairs single filaments; maximum 7 filaments in setiger 20–60, thereafter numbers decreasing gradually. From setiger 145 to setiger 181 only single filaments present. Branchial stems slender, tapering, shorter than notopodial cirri. Filaments very long, slender, digitiform. Last few branchiae short, nearly button-shaped protrusions.

Neuropodial acicular lobes distally truncate; aciculae emerging at midline. Presetal lobes low, transverse folds. Anterior postsetal lobes about as long as acicular lobes, rounded, becoming reduced to low, transverse folds by setiger 20. Ventral cirri digitiform through setiger 10, thereafter basally inflated through next 40 setigers, retaining long, digitiform narrow tips. Inflated bases ovate, decreasing rapidly from setiger 60, essentially lost by setiger 70. Posterior to setiger 100, ventral cirri tapering and digitiform. Anterior notopodial cirri slender and tapering, similar in length to anterior ventral cirri. Notopodial cirri increasing rapidly in length, by setiger 10 longer than half of body width, with 2 to 5 indistinct articulations. Median and posterior notopodial cirri without articulations. Notopodial cirri long in all branchial segments, thereafter decreasing rapidly to about setiger 240. Posterior to setiger 240 ventral cirri and notopodial cirri again of about same length (Figure 51g); far posterior notopodial cirri less than half as wide as ventral cirri.

Limbate setae slender, marginally serrated. Pectinate setae (Figure 51e) large, tapering, flat. Either 1 or both marginal teeth longer than other teeth, with ∼12 teeth. Shafts of compound falcigers (Figure 51c) inflated, with fine marginal serrations. Appendages slender, bidentate. Proximal teeth smaller than distal teeth, triangular, directed laterally. Distal teeth tapering, curved. Guards symmetrically rounded, marginally finely serrated; mucros absent. Pseudocompound falcigers and compound spinigers absent. Aciculae paired, yellow, straight; cross-sections round. Superior aciculae (Figure 51b) tapering abruptly, distally covered with a fine hood or mucro. Inferior aciculae bluntly rounded. Separation between core and sheath indistinct in both aciculae and subacicular hooks. Subacicular hooks (Figure 51d) yellow, bidentate. Hooks first present from setiger 63, present in all setigers thereafter, always single (except for replacements). Hooks distally strongly curved; heads small. Proximal teeth larger than distal teeth, triangular, directed laterally. Distal teeth less than half as massive as proximal teeth, nearly erect.

UNKNOWN MORPHOLOGICAL FEATURES.—Jaw structure; 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: 56, 58, 59. Unknown Characters: 13, 14.

ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—None.