Eunice edwardsi McIntosh 1885

Eunice edwardsi McIntosh, 1885

Eunice edwardsi McIntosh, 1885:280–282, figs. 39–40, pl. 38: figs. 14, 15, pl. 20A: figs. 4–7.

MATERIAL EXAMINED.—Holotype, BM(NH) ZK. 1885.12.1.3., off Prince Edward Island, Indian Ocean, 46°40′S, 37°50′E, 567 and 274 m, 27 Dec 1873, Challenger sta 145.

COMMENTS ON MATERIAL EXAMINED.—The holotype has at one time been dried out and the setae are all broken; it is in two pieces and has been deeply dissected frontally; the jaw apparatus is now missing.

DESCRIPTION.—Holotype complete, of unknown sex, with 118 setigers; total length about 70 mm; maximal width 3.5 mm wide at setiger 10; length through setiger 10, 8 mm. Body circular in cross-section, tapering posteriorly.

Prostomium (Figure 39h) distinctly shorter and narrower than peristomium, less than as deep as peristomium. Prostomial lobes frontally rounded, dorsally inflated; median sulcus shallow. Eyes between bases of A-I and A-II, black. Antennae in transverse row; A-I and A-II grouped together, separated by gap from A-III; all antennae similar in thickness. Ceratophores ring-shaped in all antennae, without articulations. Ceratostyles digitiform, with up to 5 cylindrical articulations in A-III. A-I to middle of anterior peristomial ring; A-II to setiger 1; A-III to setiger 3. Peristomium about twice as long as prostomium, cylindrical. Separation between rings especially distinct dorsally and ventrally, but also visible laterally; anterior ring of total peristomial length. Peristomial cirri to middle of prostomium, digitiform, without articulations.

Maxillary formula (1+1), 8+8, 10+0, 6+12, and 1+1 according to McIntosh (1885, fig. 39). Mx I missing in illustration.

Branchiae present, pectinate, about as long as notopodial cirri, not reduced in mid-body region, erect. Branchiae from setiger 3 to setiger 34; to setiger 41 according to McIntosh (1885). Branchiae terminating well before posterior end, present on less than 55% of total number of setigers. First 5 and last 2 branchiae single filaments, between setiger 10 and 20 number of filaments increasing to 5 or 6.

Neuropodial acicular lobes distally rounded, becoming conical in last segments present; aciculae emerging at midline. Pre- and postsetal lobes visible only as low folds. First 5 ventral cirri thick, tapering, becoming distinctly inflated basally from about setiger 6. Inflated bases ovate; narrow tips tapering. Inflated bases reduced from about setiger 25. Posterior ventral cirri somewhat shorter and thicker than notopodial cirri, tapering. Notopodial cirri basally somewhat inflated, rather thick in first 20 setigers, becoming increasingly digitiform posteriorly, without articulations.

All setae broken. According to McIntosh's illustrations (1885, pl. 20A: figs. 5–8), pectinate setae with few teeth and 1 marginal tooth distinctly longer than other teeth. Compound falcigers bidentate; both teeth well developed. Guards blunt without marginal serrations; mucros absent. Aciculae yellow, apparently bluntly rounded distally; cross-section round. Subacicular hooks yellow, bidentate. Hooks first present from setiger 28. Hooks tapering. Both teeth directed distally. Proximal teeth very much larger than distal teeth.

UNKNOWN MORPHOLOGICAL FEATURES.—Relationship between Mx III and left Mx IV; details of setal structures; pygidium and anal cirri.

EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEATURES.—Mx III long and located behind left Mx II. Pseudocompound falcigers and compound spinigers absent.

CHARACTERS USED IN PREPARATION OF KEY NOT SCORED.—Inappropriate Characters: 56, 58, 59. Unknown Characters: 65–68, 71, 72, 81, 82.

ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—71,2; 72,2.