Eunice franklini Monro 1924

Eunice franklini Monro, 1924

Eunice franklini Monro, 1924:56–57, figs. 14–16.—Fauchald, 1986:250–251, figs. 41–45.

MATERIAL EXAMINED.—Holotype, BM(NH) ZK 1924.1.28.81, the Franklin Shoal, Arafura Sea, 9°53′S, 129°19′E.

DESCRIPTION.—Holotype incomplete, of unknown sex, with 92 setigers; length 105 mm; maximal width 7 mm at setiger 10; length through setiger 10, 15 mm.

Prostomium (Figure 48a) distinctly shorter and narrower than peristomium, less than as deep as peristomium. Prostomial lobes frontally rounded, dorsally inflated; median sulcus shallow. Antennae in transverse row, evenly spaced, similar in thickness. Ceratophores ring-shaped in all antennae, without articulations. Ceratostyles digitiform, with up to 10 irregular articulations in A-III. A-I to setiger 1; A-II to setiger 4 (only left present); A-III to setiger 7. Peristomium cylindrical. Separation between rings distinct dorsally, barely visible ventrally; anterior ring 5/6 of total peristomial length. Peristomial cirri to posterior of prostomium, slender and tapering, with 5 indistinct articulations.

Maxillary formula 1+1, 6+7, 8+0, 6+9, and presumably 1+1 according to Monro (1924, fig. 16).

Branchiae (Figure 48e) present, pectinate, distinctly shorter than notopodial cirri, not reduced in mid-body region (not apparent in illustration), erect. Branchiae from setiger 6 to end of fragment. First branchia with 5 filaments, maximum about 25 filaments. Branchial stems long, erect, shorter than notopodial cirri. Filaments short, digitiform.

Neuropodial acicular lobes flattened conical; aciculae emerging at midline. Anterior pre and postsetal lobes distinct, distally rounded in first 15 setigers, thereafter reduced to low transverse folds. Anterior ventral cirri tapering, blunt. Ventral cirri basally inflated in median setigers. Inflated bases indistinct, ovate; narrow tips tapering. Notopodial cirri supported by dark aciculae, very long, digitiform, without articulations.

Shafts of pectinate setae (Figure 48b) wide, cylindrical. Blades flat, slightly flaring. Both marginal teeth longer than other teeth, with ∼12 teeth. Shafts of compound falcigers (Figure 48d) slender, smoothly tapering, marginally smooth, without beaks or internal striations. Appendages slender; heads distinct, bidentate. Proximal and distal teeth similar in length; proximal teeth narrowly triangular, directed laterally. Distal teeth tapering, slimmer than proximal teeth, directed obliquely distally. Guards symmetrically bluntly rounded, marginally smooth; mucros absent. Pseudocompound falcigers and compound spinigers absent. Aciculae, including 2 of 4 notopodial aciculae, black, tapering, straight, pointed; cross-section round. Subacicular hooks black (Figure 48c), bidentate. Hooks first present from setiger 34; present in all setigers thereafter, always single (except for replacements). Hooks slender, gently curved. Both teeth similar in size. Proximal teeth triangular, directed obliquely distally. Distal teeth slightly narrower than proximal teeth, nearly erect.

UNKNOWN MORPHOLOGICAL FEATURES.—Relationship between Mx III and left Mx IV; all features associated with far posterior setigers, including branchial distribution; pygidium and anal cirri.

EXPECTED STATES OF SELECTED UNKNOWN FEATURES.—Mx III short and forming part of distal are with left Mx IV.

CHARACTERS USED IN PREPARATION OF KEY NOT SCORED.—Inappropriate characters: 56. Unknown Characters: 1, 2, 13, 14, 36–38, 40, 42, 47, 50, 51, 57–60, 74, 78.

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