Leodice annulicornis (Johnston 1865)

Eunice annulicornis Johnston, 1865

Eunice annulicornis Johnston, 1865:131–132.—Baird in Johnston, 1865:340.

MATERIAL EXAMINED.—Holotype, BM(NH) ZK 1962.6.1. Spinola N.Sy. 23 Feb 1821 (see comment below).

DESCRIPTION.—Holotype complete, of unknown sex, with 145 setigers, last 33 in regeneration; total length 135 mm; maximal width 4 mm; length through setiger 10, 12.5 mm.

Prostomium (Figure 9a) distinctly shorter and narrower than peristomium, as deep as the peristomium. Prostomial lobes frontally rounded, dorsally inflated; median sulcus deep. Eyes not observed. Antennae in a transverse row, evenly spaced, similar in thickness. Ceratophores ring-shaped in all antennae, without articulations. Ceratostyles tapering, with up to 13 moniliform articulations in A-III; articulations limited to distal half of styles. A-I to middle of peristomium; A-II to setiger 1; A-III to setiger 2. Peristomium cylindrical. Separation between rings visible only dorsally between bases of peristomial cirri; anterior ring of total peristomial length. Peristomial cirri to middle of prostomium, slender and digitiform, with 6 articulations.

Jaws not observed.

Branchiae present, pectinate (Figure 9c), distinctly shorter than notopodial cirri in most setigers, longer than the notopodial cirri in the few setigers around setiger 15, not reduced in mid-body region, erect. Branchiae from setiger 3 to setiger 134, missing in 12 last (regenerating) setigers. Branchiae present to near posterior end, present on more than 65% of total number of setigers. Last 2–3 pairs single filaments; all other branchiae with at least two filaments. Maximum 9 filaments from about setiger 15. Length of branchiae decreasing rapidly from about setiger 25; numbers of filaments reduced to 3–4; this number retained for rest of branchial region. Stems tapering, about as long as filaments. Filaments distinctly shorter than notopodial cirri, digitiform.

Median acicular lobes distally truncate with aciculae emerging dorsal to midline. Pre- and postsetal lobes low, transverse folds. Ventral cirri tapering from narrow bases through setiger 5. Median ventral cirri basally inflated. Bases ovate or spherical, narrow tips digitiform. Inflated bases reduced from about setiger 30. Ventral cirri digitiform in posterior of body. All notopodial cirri slightly inflated basally, articulated in all setigers with 3–4 distinct articulations in most segments.

Limbate setae slender. Shafts of pectinate setae (Figure 9c) wide, flat. Blades flaring, flat. One marginal tooth distinctly longer than other teeth, with ˜15 teeth. Shafts of compound falcigers (Figure 9b) inflated, with distinct internal striations, marginally smooth; distal beaks present. Appendages short, with wide bases, bidentate. Proximal teeth shorter than distal teeth, broadly triangular, directed laterally. Distal teeth gently curved, directed laterally. Guards symmetrically bluntly pointed, without mucros. Pseudocompound falcigers and compound spinigers absent. Aciculae paired, black, tapering, gently curved; cross-section round. Subacicular hooks (Figure 9d) black, bidentate. Hooks first present from setiger 35, present in all setigers thereafter, always single. Hooks distally rapidly tapering. Both teeth of similar size, directed obliquely distally.

UNKNOWN MORPHOLOGICAL FEATURES.—Pygidium and anal cirri not described; jaws not described.

EXPECTED STATES OF SELECTED UNKNOWN FEATURES.—Mx III long, located between Mx II and Mx IV, but not part of arc with left Mx IV.

CHARACTERS USED IN PREPARATION OF KEY NOT SCORED.—Inappropriate Characters: 56, 58, 59. Unknown Features: 4,6,13,14,75,78.

ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—75,1.