Eunice tubicola (Treadwell 1922)

Eunice tubicola (Treadwell, 1922)

Leodice tubicola Treadwell, 1922:139–142, figs. 17–23, pl. 3: figs. 1–6.

Eunice tubifex.—Hartman, 1956:282–283 [in part, not Eunice tubifex Crossland, 1904].

MATERIAL EXAMINED.—Holotype, AMNH 1540, Pago Pago, Samoa, 1920.

COMMENTS ON MATERIAL EXAMINED.—The anterior end had been dissected and the jaws are now missing. The lower lip had been sliced off, so the illustration is partly a reconstruction (below the dashed line indicated in the illustration). Remnants of a stiff horny tube was also present in sample, as were two fragments of another specimen, apparently of the same species.

DESCRIPTION.—Holotype complete, with 83 setigers; total length 26.5 mm; maximal width 1.2 mm at about setiger 10; length through setiger 10,4.0 mm.

Prostomium (Figure 111a) distinctly shorter and narrower than peristomium, less than as deep as peristomium. Prostomial lobes frontally rounded, dorsally flattened; median groove shallow. Eyes not observed. Antennae in a horseshoe, evenly spaced, similar in thickness. Ceratophores ring-shaped in all antennae, without articulations. Ceratostyles digitiform, without articulations. All antennae similar in length, none reaching beyond anterior peristomial ring. Peristomium cylindrical. Separation between rings distinct dorsally and ventrally; anterior ring ∼ of total peristomial length. Peristomial cirri digitiform, without articulations, barely reaching middle of anterior peristomial ring.

Jaws missing.

Branchiae (Figure 111e) present; single filaments, about as long as notopodial cirri. Branchiae from setiger 22 on one side and 24 on other side to setiger 69. Branchiae terminating well before posterior end, present on more than 65% of total number of setigers. All branchiae digitiform filaments, about as long as notopodial cirri.

Anterior neuropodial acicular lobes (Figure 111b) obliquely truncate with small, rounded tabs above aciculae; aciculae emerging at midline. Median and posterior neuropodial acicular lobes nearly triangular with straight dorsal and distal edges. Pre- and postsetal lobes low, transverse folds. First 5 ventral cirri digitiform, thereafter basally strongly inflated, through rest of body. Inflated bases thick, transverse welts; narrow tips short and button-shaped. Anterior notopodial cirri medially inflated, becoming digitiform in posterior setigers, but retaining same length as in anterior setigers. Notopodial cirri without articulations.

Limbate setae marginally serrated. Pectinate setae small (Figure 111g), delicate, tapering, flat. About 12 teeth present. Shafts of compound falcigers (Figure 111f) strongly inflated. Appendages short and slender, bidentate. Proximal and distal teeth well developed, slender, tapering, curved and nearly parallel in median setigers, diverging in anterior setigers (Figure 111d). Guards blunt with marginal teeth; mucros absent. Pseudocompound falcigers absent. Compound spinigers (Figure 111c) in first 12 setigers. Shafts strongly inflated; appendages long, knife-like and marginally serrated. Aciculae single, yellow, smoothly tapering, straight; cross-sections round. Subacicular hooks (Figure 111h) dark yellow (honey-colored) or amber, bidentate. Hooks first present from setiger 21, present in all setigers thereafter, always single (except for replacements). Hooks about as thick as aciculae, gently curved with distinct narrow necks and distinct heads. Proximal teeth very much larger than distal teeth, strongly curved. Distal teeth nearly erect.

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

EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEATURES.—Mx III long and straight, located behind left Mx II.

CHARACTERS USED IN PREPARATION OF KEY NOT SCORED.—Inappropriate Characters: 22, 33, 34, 39–42, 56, 60. Unknown Characters: 13, 14, 74, 78.

ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—None.