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Eunice denticulata Webster 1884

Comprehensive Description

provided by Smithsonian Contributions to Zoology
Eunice denticulata Webster, 1884

Eunice denticulata Webster, 1884:316–317, pl. 10: figs. 41, 41a–b, 42–45.

MATERIAL EXAMINED.—Two syntypes, plus 9 slide preparations of parapodia, USNM 4790, Bermuda, coll. G. Brown Goode, 1876 or 1877.

DESCRIPTION.—Large syntype incomplete, with 125 setigers; length 35 mm; maximal width 3 mm at setiger 10; length through setiger 10, 7 mm. Small syntype incomplete, with 76 setigers; length 25 mm; maximal width 3 mm at setiger 10; length through setiger 10, 6 mm. Anterior end inflated; rest of body slightly dorsoventrally flattened, but basically cylindrical.

Prostomium (Figure 37d) distinctly shorter and narrower than peristomium, less than as deep as peristomium. Prostomial lobes frontally rounded, dorsally inflated; median sulcus deep. Dark eyes posterior to bases of A-I. Ceratophores long in all antennae, without articulations. Ceratostyles tapering, without articulations; A-III slightly longer than other antennae; none reaching beyond peristomium. Peristomium massive, cylindrical, with distinct, muscular lower lip. Separation between rings distinct ventrally, visible, but poorly marked dorsally; anterior ring of total peristomial length. Peristomial cirri to middle of anterior peristomial ring, without articulations, slender and tapering.

Maxillary formula of large syntype 1+1, 6+6, 6+0, 3+9, and 1+1. Mx III part of distal arc with left Mx IV. Left Mx IV with reduced dentate portion and relatively long wing overlapping Mx III.

Branchiae (Figure 37h) present, palmate, distinctly longer than notopodial cirri, not reduced in mid-body region. Branchiae from setiger 27 in both specimens. First 10–12 pairs single filaments; where best developed, towards end of fragments, branchiae with up to 3 filaments. Filaments digitiform, about as long as notopodial cirri.

Anterior neuropodial acicular lobes (Figure 37e) broadly asymmetrically truncate with aciculae emerging near upper edge; small elevated tabs present superior to acicula; median and posterior acicular lobes without the elevated tabs (Figure 37a). All presetal and postsetal lobes low folds. Anterior ventral cirri thick and tapering, becoming basally inflated from about setiger 10. Inflated bases elongated transverse welts; narrow tips tapering. Inflated bases reduced from about setiger 65 and absent from about setiger 85. Posterior ventral cirri short and digitiform. Anterior notopodial cirri long and digitiform, becoming slender in branchial region, but retaining similar length throughout, without articulations.

Limbate setae narrow and marginally frayed. Pectinate setae (Figure 37g,k) narrow, tapering and furled. Both marginal teeth thicker and slightly longer than other teeth; ∼12 teeth present. Shafts of compound falcigers (Figure 37i) distally inflated, some marginally serrated, others with smooth margins. Appendages (Figure 37b,i) slender, varying in length, bidentate. Proximal teeth very much larger than distal teeth, directed laterally or slightly basally. Distal teeth short and bent. Guards distally symmetrically rounded; mucros absent. Pseudocompound falcigers and compound spinigers absent. All aciculae single; anterior aciculae dark yellow, darkening to brown from about setiger 15, distally slightly expanded, slightly hammer-headed (Figure 37f,l), bent towards anterior end; cross-section round. Subacicular hooks (Figure 37c,j) brown, bidentate. Hooks first present from setiger 18–19, present in all setigers thereafter, always single (except for replacements). Shafts strongly curved; head very distinct; proximal teeth large, curved, directed laterally or basally. Distal teeth smaller, strongly curved and directed laterally.

UNKNOWN MORPHOLOGICAL FEATURES.—Posterior termination of branchiae; pygidium and anal cirri.

EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEATURES.—Branchiae continued to near posterior end.

CHARACTERS USED IN PREPARATION OF KEY NOT SCORED.—Inappropriate Characters: 22, 34, 56, 58, 59. Unknown Characters: 1, 2, 36–38, 40, 42, 74, 78.

ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—37,1; 38,1.
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bibliographic citation
Fauchald, Kristian. 1992. "A Review of the Genus Eunice (Polychaeta: Eunicidae) Based upon Type Material." Smithsonian Contributions to Zoology. 1-422. https://doi.org/10.5479/si.00810282.523

Comprehensive Description

provided by Smithsonian Contributions to Zoology
Eunice conglomerans Ehlers, 1887

Eunice conglomerans Ehlers, 1887:93-95, pl. 23: figs. 1-9, pl. 24: figs. 1–4.

MATERIAL EXAMINED.—One syntype, MCZ 706, Blake sta 10, 24°44′N, 83°26′W, 68 m. Two syntypes, ZMB 6730, Key West, 2–3 m, coll. A. Agassiz.

DESCRIPTION.—MCZ syntype complete with 166 setigers; total length 163 mm; maximal width 3.5 mm at setiger 10; length through setiger 10, 6.5 mm. Ventrum flattened in anterior of body; dorsum strongly convex, especially in anterior of body except cylindrical prostomium and peristomium. ZMB syntypes both incomplete with 228 and 223 setigers; a posterior fragment encased in thick, pergamentaceous tubes also present.

Prostomium (Figure 35a) distinctly shorter than peristomium, about as wide as peristomium, as deep as of the peristomium. Prostomial lobes frontally obliquely truncate, dorsally flattened; median sulcus deep. Eyes small, black, posterior to bases of A-I. Six antennae present; A-III apparently duplicated. Antennae arranged in a straight line, evenly spaced, similar in thickness. Ceratophores ring-shaped in all antennae, without articulations. Ceratostyles digitiform, with 5 articulations in A-II and A-III and 4 in A-I; all articulations cylindrical. All antennae similar in length, barely reaching posterior margin of peristomium. Peristomium cylindrical with scoop-shaped projecting lower lip. Separation between rings distinct dorsally; ventrally peristomium also divided into 2 rings, but connection between dorsal and ventral transverse grooves uncertain; anterior ring of total peristomial length. Peristomial cirri short and tapering, without articulations.

Maxillary formula of both ZMB specimens 1+1, 5+5, 6+0, 2+6, and 1+1. Left Mx IV very small, curving around Mx III, appearing nearly fused to Mx III.

Branchiae present, palmate, distinctly longer than notopodial cirri, not reduced in mid-body region. Branchiae from setiger 29 (from setigers 23 and 27 in other specimens) to setiger 165. Branchiae present to near posterior end, present on more than 65% of total number of setigers. Most branchiae with 2 filaments; maximum 4 filaments from about setiger 130. Branchial stems short, flexible and conical. Filaments long, robust, strongly wrinkled with very large internal blood vessels. Anterior neuropodial acicular lobes asymmetrically rounded with aciculae emerging from distal end above midline; median and posterior acicular lobes (Figure 35b,c) becoming symmetrically conical posteriorly. All pre- and postsetal lobes low folds. First 4 ventral cirri thick and tapering. Ventral cirri becoming inflated with large, transverse welt-like glandular bases from about setiger 5; narrow tips tapering. From about setiger 100, basal inflations decreasing in importance. Far posterior ventral cirri thick, digitiform and held curved up along the posterior face of parapodia (Figure 35c); glandular contents of ventral cirri retained (apparently) even in these posterior segments. Anterior notopodial cirri thick, basally inflated and tapering, becoming distinctly digitiform from beginning of branchial region; far posterior notopodial cirri slender and digitiform; all notopodial cirri without articulations.

Limbate setae long, slender, rare in posterior setigers. Most dorsal fascicles numerically dominated by very long, slender pectinate setae. Pectinate setae (Figure 35g) tapering, furled. Both marginal teeth longer than other teeth; ∼15 teeth present. Shafts of compound falcigers (Figure 35f,h) distinctly inflated, marginally strongly serrated. Appendages of superior hooks (Figure 35h) in anterior setigers, apparently nearly unidentate in that both teeth, but especially proximal teeth reduced and the distal teeth nearly erect. Inferior hooks (Figure 35d) in same fascicle distinctly bidentate with small teeth; appendages narrower and somewhat longer than in posterior setigers. In posterior setigers all appendages (Figure 35f) similar; each appendage with both teeth well developed; proximal teeth very large. Guards distally symmetrically rounded, marginally strongly serrated in all hooks; mucros absent. Pseudocompound falcigers and compound spinigers absent. Aciculae (Figure 35i) single, black, distally bent dorsally, with slightly, but distinctly knobbed appearance, nearly bidentate in some setigers; cross-section round. First few subacicular hooks increasingly darker brown, from about setiger 30 hooks black, bidentate. Hooks first present from setiger 22, present in all setigers thereafter, always single (except for replacements). Hooks (Figure 35e) with distinct curved heads with very large, parrot-beaked main fangs and much smaller, curved distal teeth. Guards distally rounded.

UNKNOWN MORPHOLOGICAL FEATURES.—Pygidium and anal cirri.

EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEATURES.—None.

CHARACTERS USED IN PREPARATION OF KEY NOT SCORED.—Inappropriate Characters: 34, 56, 58, 59. Unknown Characters: 39, 40, 74, 78.

ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—None.
license
cc-by-nc-sa-3.0
bibliographic citation
Fauchald, Kristian. 1992. "A Review of the Genus Eunice (Polychaeta: Eunicidae) Based upon Type Material." Smithsonian Contributions to Zoology. 1-422. https://doi.org/10.5479/si.00810282.523