Eunice biformicirrata (Treadwell 1922)

Eunice biformicirrata (Treadwell, 1922)

Leodice biformi-cirrata Treadwell, 1922:148–149, figs. 34, 35, pl. 4: figs. 6–11.

Eunice grubei Hartman, 1956:282 [not Eunice grubei Gravier, 1900].

MATERIAL EXAMINED.—Holotype, AMNH 1527, Suva, Fiji, Apr 1920, coll. A.L. Treadwell.

DESCRIPTION.—Holotype complete male with 137 setigers; total length 217 mm; maximum width 7 mm at setiger 15. Length through setiger 10, 17 mm; width at setiger 10, 6.5 mm. Anterior body cylindrical with strongly convex dorsum, becoming ventrally flattened in median setigers and dorsoventrally flattened in posterior setigers. Anterior end truncate, tapering slowly posteriorly.

Prostomium (Figure 21g) distinctly shorter than and narrower than peristomium, less than as deep as peristomium. Prostomial lobes frontally rounded, dorsally inflated; median sulcus deep. Eyes not seen. Antennae in a horseshoe, evenly spaced, similar in thickness. Ceratophores ring-shaped, without articulations. Ceratostyles tapering; basal without articulations; styles increasingly articulated in median and articulations distinctly moniliform in distal of each antenna. A-I to middle of peristomium; A-II and A-III to setiger 1; maximally ~10 articulations. Peristomium cylindrical. Separation between rings distinct ventrally and at bases of peristomial cirri; anterior ring of total peristomial length. Peristomial cirri to middle of first peristomial ring, thick and tapering, with about 7 short, moniliform articulations.

Jaws missing; according to Treadwell, maxillary formula 1+1, 5+5, 6+0, ?+8, and 1+1.

Branchiae (Figure 21h, i) present, pectinate, distinctly longer than notopodial cirri, not reduced in mid-body region, erect. Branchiae from setiger 3 to setiger 132. Branchiae present to near posterior end, present on more than 65% of total number of setigers. First and last 5 branchiae single filaments; maximum number of filaments 7 reached at setiger 10, thereafter number of filaments decreasing slowly; by setiger 100 (Figure 21h) only 2 filaments left. Branchial stems thick, tapering, shorter than filaments. Filaments digitiform.

Anterior neuropodial acicular lobes short, asymmetrically truncate or rounded with aciculae emerging well above midline; median and posterior acicular lobes broadly asymmetrically truncate. All pre- and postsetal lobes low, continuous folds. Anterior ventral cirri digitiform in 3 first setigers. Ventral cirri strongly inflated from about setiger 4. Inflated bases spherical; narrow tips digitiform. Inflation decreasing posterior to setiger 60; far posterior ventral cirri digitiform. All notopodia tapering with 2 or 3 cylindrical articulations.

Limbate setae longer than other setae, marginally serrated. Pectinate setae (Figure 21l) very small; shaft cylindrical, narrow; blades flat, flared. One marginal tooth longer than other teeth; ~20 very fine teeth. Shafts of compound falcigers (Figure 21j) tapering, internally striated, marginally smooth, with distinct distal beak. Appendages short, tapering with distinct heads, bidentate. Proximal teeth curved, triangular, directed laterally; distal teeth longer than proximal teeth, tapering, curved, directed laterally. Guards asymmetrically bluntly pointed, marginally smooth, without mucros. Pseudocompound falcigers and compound spinigers absent. Aciculae (Figure 21k) paired, black, blunt, gently curved in most setigers; cross-section round. Subacicular hooks (Figure 21m) black, bidentate. Hooks first present from setiger 27, present in all setigers thereafter, always single (except for replacements). Hooks with large heads and narrow necks. Proximal teeth slender, tapering, directed obliquely distally; distal teeth shorter than proximal teeth, but distinctly thicker, directed obliquely laterally.

UKNOWN MORPHOLOGICAL FEATURES.—Pygidium and anal cirri; relation between Mx III and left Mx IV.

EXPECTED STATE OF UNKNOWN MORPHOLOGICAL FEATURES.—Mx III part of distal arc with left MX IV; short, curved. Left Mx IV distinctly shorter than right Mx IV, curved.

CHARACTERS USED IN PREPARATION OF KEY NOT SCORED.—Inappropriate Characters: 56, 58, 59. Unknown Characters: 13,14,74,78.

ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—None.