Eunice biannulata Moore 1904

Eunice biannulata Moore, 1904

Eunice biannulata Moore, 1904, pp. 487–490, pl. 37: figs. 10–18, pl. 38: fig. 42.—Berkeley and Berkeley, 1939, p. 335.—[?] Hartman, 1939, p. 13.—Fauchald [in press].

Eunice longicirrata.—Hartman, 1944, pp. 104–107, pl. 6: figs. 118–122, partim [not E. longicirrata Webster].

MATERIAL.—La Jolla, shale and sandstone reefs just north of caves, 1940, Allan Hancock Foundation station 1210–40, 1 specimen (USNM 38983).

DISTRIBUTION.—E. biannulata is known from southern California and western Mexico (Moore, 1904; Berkeley and Berkeley, 1939; Hartman, 1944 and Fauchald, in press). It is found intertidally and in very shallow water. The possible wider distribution is not known since E. biannulata has been confused with several related species.

Eunice biannulata Moore, 1904

Eunice biannulata Moore, 1904:487–490, pl. 37: figs. 10–18, pl. 38: fig. 42.—Fauchald, 1969:2–4, fig. 1a-e.

MATERIAL EXAMINED.—Holotype, CAS Type 35 (Inv. cat. no. 019712), San Diego, California, coll. E.C. Starks.

DESCRIPTION.—Holotype complete, with 139 setigers; total length 105 mm; maximum width 3 mm at setiger 15. Length through setiger 10, 12 mm; width at setiger 10, 2.75 mm. Body slender, cylindrical throughout.

Prostomium (Figure 21b) distinctly shorter than peristomium, about as wide as peristomium, as deep as of the peristomium. Prostomial lobes frontally truncate, dorsally flattened; median sulcus deep. Eyes dark, posterior to and between A-I and A-II. Antennae in a horseshoe, evenly spaced, similar in thickness. Ceratophores ring-shaped in all antennae, without articulations. Ceratostyles slender and tapering; basal – of ceratostyle without articulations; distal portions increasingly articulated; final 5–6 articulations rounded, drop-shaped. A-I to second peristomial ring; A-II to setiger 2; A-III to setiger 4. Peristomium slightly flaring ventrally, with distinct, muscular lower lip. Separation between rings distinct on all sides; anterior ring of total peristomial length. Peristomial cirri to front edge of peristomium, basally slightly inflated, with 4 cylindrical articulations.

Jaws not examined. Mandibles strongly calcified.

Branchiae present, pectinate, distinctly longer than notopodial cirri, not reduced in mid-body region, erect. Branchiae from setiger 3 through setiger 50. Branchiae terminating well before posterior end, present on less than 55% of total number of setigers. First and the last 2–3 pairs single filaments, maximum 8 filaments at about setiger 10. Branchial stem erect, tapering, longer than filaments. Filaments slender and digitiform, about as long as notopodial cirri.

Anterior neuropodial acicular lobes symmetrically truncate, becoming asymmetrically rounded with aciculae emerging superior to midline in far posterior setigers (Figure 21a). Pre-and postsetal lobes low, transverse folds. Anterior ventral cirri thick, tapering, becoming distinctly inflated basally from about setiger 6. Inflated bases spherical; narrow tip rather large, digitiform. Inflated bases decreasing posterior to setiger 90, indistinct in last 10–15 setigers. Far posterior ventral cirri digitiform. All notopodial cirri medially inflated; anterior and median ones with 3–4 cylindrical articulations; posterior ones without articulations.

Limbate setae about as long as compound hooks, smooth-edged. Shafts of pectinate setae (Figure 21c) wide, cylindrical; blades furled, tapering. Both marginal teeth distinctly longer than other teeth, ~10 very large teeth present. Shafts of compound falcigers (Figure 21f) tapering in most setigers, slightly inflated distally in a few setigers, marginally smooth; distal beak absent. Appendages thick, barely tapering; heads large, bidentate. Proximal teeth triangular, directed laterally; distal teeth shorter than proximal teeth, bent, directed laterally. Guards distally symmetrically rounded, marginally serrated; mucros absent. Pseudocompound falcigers and compound spinigers absent. Aciculae (Figure 21d) paired, yellow, tapering to blunt, distinctly curved tips; cross-sections round. Separation of core and sheath indistinct in both aciculae and subacicular hooks. Subacicular hooks (Figure 21e) yellow, bidentate. Hooks first present from setiger 38, present in all setigers thereafter, paired in some setigers. Hooks barely tapering; head indistinct. Proximal teeth large, directed laterally; distal teeth short, narrow, directed obliquely distally.

UKNOWN MORPHOLOGICAL FEATURES.—Jaw structure; pygidium and anal cirri.

EXPECTED STATE OF UNKNOWN MORPHOLOGICAL 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: None.

ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—None.