Eunice collaris Grube 1870

Eunice collaris Grube, 1869

Eunice collaris Grube, 1869:494–495 [in part].

MATERIAL EXAMINED.—Three syntypes, ZMB F500, F501, and F2035, Tor, Red Sea, among corals, coll. Ehrenberg.

COMMENTS ON MATERIAL EXAMINED.—None of the syntypes are complete, two are very soft and generally in bad shape, but are sufficienntly complete, and so distributional features can be identified as can the shapes of the setae. The syntype from F500 is in very good condition and is here described in detail.

DESCRIPTION.—Syntype from F500 incomplete with 56 setigers; length 44 mm; maximal width 6 mm at setiger 10; length through setiger 10, 12 mm. Anterior end cylindrical, frontally truncate; body becoming dorsally flattened towards posterior end of fragment.

Prostomium (Figure 33a) distinctly shorter and narrower than peristomium, as deep as of the peristomium. Prostomial lobes frontally rounded, dorsally flattened; median sulcus deep. Eyes present posterior to bases of A-I. Antennae evenly spaced, similar in thickness. Ceratophores ring-shaped in all antennae, without articulations. Ceratostyles digitiform; maximum 8 articulations in A-III; articulations cylindrical basally, becoming drop-shaped, nearly moniliform distally. A-I to setiger 1; A-II to setiger 2 and A-III to setiger 4. Peristomium cylindrical; lower lip slightly inflated, distinctly muscular. Separation between rings well marked dorsally and ventrally and faintly visible laterally; anterior ring ∼ of total peristomial length. Peristomial cirri short and digitiform; articulations absent.

Jaws not examined.

Branchiae (Figure 33f) present, pectinate, distinctly longer than notopodial cirri, not reduced in mid-body region, flexible. Branchiae from setiger 17 (18 in other specimens) to end of incomplete specimens. All branchiae pectinate with up to 12 filaments at about setiger 50. Branchial stem weak, flexible. Branchial filaments long, slender.

Neuropodial acicular lobes symmetrically rounded; aciculae emerging at midline. All presetal lobes low folds. Anterior postsetal lobes distinct ridges behind acicular lobe; median and posterior postsetal lobes low, transverse folds. First 3–4 ventral cirri thick and tapering. Median ventral cirri slightly inflated basally. Inflated bases ovate; narrow tips tapering. Inflated bases totally lost by setiger 50; posterior ventral cirri thick and tapering. All notopodial cirri distinctly inflated basally, and tapering to long tips; basal inflated region especially distinct in setigers 5–25, without articulations.

Limbate setae slender, marginally serrated. Pectinate setae (Figure 33e), numbering up to 12 in a parapodium, tapering, furled into shallow scoops; 1 marginal tooth distinctly longer than other teeth; ∼15 teeth present. Shafts of compound falcigers (Figure 33d) slightly inflated, very finely marginally serrated. Appendages long, tapering; head distinct, bidentate. Proximal teeth narrow, directed basally, distal teeth distally blunt, curved. Guards symmetrically bluntly pointed, marginally serrated, without mucros. Pseudocompound falcigers and compound spinigers absent. Aciculae single, dark brown, bluntly pointed and straight; cross-section round. Subacicular hooks (Figure 33c,b,c) brown, bidentate. Hooks first present from setiger 27 or 33, present in all setigers thereafter, always single (except for replacements). Hooks abruptly tapered, with distinct head at right angles to long axis. Proximal teeth very large, blunt; distal teeth short and rounded.

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

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

CHARACTERS USED IN PREPARATION OF KEY NOT SCORED.—Inappropriate Characters: 56, 58, 59. Unknown Characters: 1, 2, 15, 37, 38, 40, 47, 50, 63, 74, 78.

ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—37,1; 38,1.