Eunice collini Augener 1906

Eunice collini Augener, 1906

Eunice collini Augener, 1906:133–135, pl.4: figs. 66–73.

Eunice rosaurae Monro, 1939:351–352, fig. 28a–f [in part].

MATERIAL EXAMINED.—Holotype, MCZ 2011, Blake sta 288, off Barbados, 730 m. One syntype of E. rosaurae, BM(NH) ZK 1941.1.1.217-221, off St. George, Grenada, 12°05′N, 61°49′W, 720–800 m, 27 Nov 1937, trawled, Rosaura Expedition, Atlantic, 1937–1938, sta 34.

DESCRIPTION.—Holotype of E. collini incomplete with 94 setigers; length 45 mm; maximal width 4 mm at about setiger 15; length through setiger 10, 7 mm. Syntype of E. rosaurae complete with 76 setigers; total length 42 mm; maximal width 5 mm at about setiger 15; length through setiger 10, 9 mm. Body anteriorly inflated; posterior end wide and dorsoventrally flattened; anterior and posterior ends abruptly tapered.

Prostomium (Figure 34a,e) distinctly shorter and narrower than peristomium, as deep as of the peristomium. Prostomial lobes frontally rounded, dorsally inflated; median sulcus very deep. Eyes absent. Antennae in a horseshoe, evenly spaced, similar in thickness. Ceratophores ring-shaped in all antennae, without articulations. Ceratostyles tapering, without articulations, smooth or irregularly wrinkled. A-I to second peristomial ring; A-II to setiger 2; A-III incomplete in both specimens. Peristomium flaring anteriorly. Separation between rings distinct dorsally and ventrally; anterior ring ∼ of total peristomial length. Peristomial cirri to front margin of peristomium, slender and digitiform, without articulations.

Jaws not examined.

Branchiae (Figure 34k) present, palmate, distinctly shorter than notopodial cirri, not reduced in mid-body region, erect. Branchiae from setiger 16 to setiger 85 in holotype; from setiger 12 to setiger 70 in syntype of E. rosaurae. Branchiae terminating well before posterior end. Most branchiae short, thick, single filaments; scattered along branchiated region, especially posteriorly, short, nearly tubercular second filaments present.

All neuropodial acicular lobes truncate or gently rounded; aciculae emerging at midline. All pre- and postsetal lobes low, transverse folds. Anterior ventral cirri thick and tapering. Ventral cirri basally inflated from setiger 5. Inflated bases ovate, narrow tips tapering. Inflated bases reduced from about setiger 50; free tips elongating and becoming digitiform (Figure 34d). In far posterior setigers ventral cirri about twice as long as notopodial cirri but otherwise similar (Figure 34k). Anterior notopodial cirri basally inflated, distally slender; posterior notopodial cirri similar in shape but somewhat longer, without articulations.

Limbate setae slender; margins smooth. Shafts of pectinate setae slender (Figure 34f); blades distinctly flaring, flat. One marginal tooth slightly longer than other teeth; about 10 teeth present. Shafts of compound falcigers (Figure 34c,i) tapering from wide distal end; margins smooth. Appendages thick, tapering; heads distinct, bidentate. Proximal teeth about twice as large as distal teeth, directed laterally; distal teeth nearly erect or gently curved, tapering. Guards symmetrically rounded; cutting edge frayed rather than serrated; mucros absent. Pseudocompound falcigers and compound spinigers absent. Aciculae single in anterior parapodia, paired in all median and posterior parapodia. Superior aciculae (Figure 34h) with knife-shaped cross-section, light to dark brown, distally pointed. Inferior aciculae (Figure 34g) with round cross-section, distally tapering to straight tips, dark brown to jet-black. Both aciculae projecting (Figure 34d,k), for nearly half their length in median and posterior setigers, nearly half width of body represented by projecting aciculae in far posterior setigers. Posterior notopodial cirri supported by internal black aciculae; notopodial aciculae absent in anterior setigers. Subacicular hooks (Figure b,j) black, bidentate. Hooks first present from setiger 26–27, present in all setigers thereafter, always single (except for replacements). Hooks tapering, with distinct heads; proximal teeth much larger than distal teeth, directed laterally; distal teeth directed distally. Thin, pergamentaceous tube associated with syntype of E. rosaurae.

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

EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEATURES.—Mx III short, forming distal arc with left Mx IV.

CHARACTERS USED IN PREPARATION OF KEY NOT SCORED.—Inappropriate Characters: 14, 22, 56, 58, 59. Unknown Characters: 1, 2, 6, 23, 38–40, 42, 74, 78.

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