Eunice narconi Baird 1869

Eunice narconi Baird, 1869

Eunice narconi Baird, 1869:350-351.

MATERIAL EXAMINED.—Three syntypes, BM(NH) ZB 1972.73, Narcon Island, Antarctic Seas, Erebus and Terror Southern Seas Expedition, 1839–1843.

COMMENTS ON MATERIAL EXAMINED.—The type material has been dried out at one time, so illustrating the soft-parts would be meaningless. The material consists of three anterior ends and some fragments of median and posterior setigers. One anterior end is in very bad shape and even the number of segments cannot be determined; the description is based on the other two anterior fragments.

DESCRIPTION.—Larger fragment with about 75 setigers; length 25 mm; maximal width 2 mm; length through setiger 10, 6 mm. Shorter fragment with about 50 segments; length 17 mm; maximal width 1.5 mm; length through setiger 10,5 mm.

Prostomium distinctly shorter and narrower than peristomium. Prostomial lobes frontally rounded, dorsally inflated; median sulcus shallow. Shape and length of antennae cannot be determined. Peristomium cylindrical. Anterior peristomial ring of total peristomial length. Peristomial cirri short, without articulations.

Jaws not examined.

Branchiae present, palmate. Branchiae from setiger 8 to setigers 33–35. Branchiae terminating well before posterior end, present on less than 55% of total number of setigers. Where best developed at around setiger 15 at least 3 filaments present.

Parapodial shape cannot be described in detail; ventral cirri with distinctly inflated bases in branchial region.

Limbate setae slender, marginally finely serrated. Pectinate setae (Figure 78f) tapering, flat. One marginal tooth very much longer and stronger than all other teeth; ~10 teeth present. Shafts of compound falcigers (Figure 78g) distinctly inflated, marginally serrated. Appendages long, narrow, bidentate. Both teeth gently curved. Guards distally bluntly pointed, marginally serrated; mucros absent. Pseudocompound falcigers and compound spinigers absent. Aciculae (Figure 78e) paired, yellow, tapering to blunt points, gently curved ventrally; cross-sections round. Separation between core and sheath indistinct in both aciculae and subacicular hooks. Subacicular hooks (Figure 78d) yellow, bidentate. Hooks first present from setiger 35–38. Hooks distally curved. Proximal teeth larger than distal teeth. Both teeth directed distally.

UNKNOWN MORPHOLOGICAL FEATURES.—Most prostomial and peristomial features; jaw structure; nearly all parapodial features; pygidium and anal cirri.

EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEATURES.—None.

CHARACTERS USED IN PREPARATION OF KEY NOT SCORED.—Inappropriate Characters: 56, 58, 59. Unknown Characters: 1, 2, 4, 6, 11–23, 25, 32–34, 39, 40, 43–52, 54, 55, 57–64, 81, 82.

ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—None.