Eunice guanica (Treadwell 1921)

Eunice guanica (Treadwell, 1921)

Leodice guanica Treadwell, 1921: 39–40, figs. 107–116, pl. 2: figs. 9–12.

Eunice afra.—Hartman, 1956:282 [not Eunice afra Peters, 1854].

MATERIAL EXAMINED.—Holotype, AMNH 1915–1342, Sand Key, Key West, Florida.

DESCRIPTION.—Holotype complete, of unknown sex, with 224 setigers; total length 100 mm; maximal width 4 mm at setiger 10; length through setiger 10, 7 mm. Body anteriorly cylindrical with very short parapodia.

Prostomium (Figure 52f) distinctly shorter and narrower than peristomium, as deep as of peristomium. Prostomial lobes short, frontally rounded, dorsally inflated; median sulcus short. Antennae in a nearly complete circle and directed forwards, evenly spaced, similar in thickness. Ceratophores ring-shaped in all antennae, without articulations. Ceratostyles digitiform, with 2 or 3 cylindrical articulations in A-II and A-III. A-I to middle of anterior peristomial ring; A-II to middle of anterior peristomial ring; A-III to posterior edge of anterior peristomial ring. Peristomium more than twice as long as prostomium, cylindrical with a ventral depression anteriorly. Peristomium divided ventrally into 3 equally long parts; posteriormost of these parts distinct also dorsally representing posterior peristomial ring, separation indistinct laterally. Peristomial cirri barely reach front edge of posterior peristomial ring, tapering, without articulations.

Jaws missing.

Branchiae present, distinctly longer than notopodial cirri, not reduced in mid-body region. Branchiae from setiger 19 to setiger 224. Branchiae present to near posterior end, present on more than 65% of total number of setigers. First 10 branchiae single filaments, thereafter some segments with 2 filaments, others with single filaments, up to of segments in branchial region, without branchiae. Branchiae very long (Figure 52g), slender, digitiform, outreaching notopodial cirri in all but a few posterior branchial segments.

Anterior neuropodial acicular lobes distally symmetrically rounded; posterior acicular lobes triangular with prominently projecting aciculae; aciculae emerging at midline. All presetal lobes low transverse folds. Anterior postsetal lobes higher than acicular lobes, distally rounded; postsetal lobes reduced to low folds by beginning of branchial region. First 6–7 ventral cirri digitiform. Ventral cirri becoming basally inflated in median setigers. Bases ovate; narrow tips short and button-shaped. Inflated bases continued through rest of body. Notopodial cirri tapering, similar in length except shorter in first 2 segments. Notopodial cirri without articulations.

Limbate setae slender, marginally frayed. Pectinate setae (Figure 52i) relatively large, but very delicate, flaring, flat. Both marginal teeth distinctly longer than other teeth, with 15 teeth. Shafts of compound falcigers (Figure 52h) distally inflated, marginally smooth. Appendages tapering; head small, bidentate. Proximal teeth considerably larger than distal teeth, tapering, directed slightly distally. Distal teeth gently curved, tapering. Guards symmetrically rounded; mucros absent. Pseudocompound falcigers and compound spinigers absent. Aciculae single, black, distally tapering to blunt, straight tips; cross-sections round. Subacicular hooks (Figure 52j) black, bidentate. Hooks first present from setiger 36, present in all setigers thereafter, always single (except for replacements). Hooks abruptly tapered with small heads; both teeth directed distally, very small, blunt.

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

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

CHARACTERS USED IN PREPARATION OF KEY NOT SCORED.—Inappropriate Characters: 34, 56, 60. Unknown Characters: 13, 14, 40, 74, 78.

ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—None.