A Review of the Genus Eunice - Smithsonian Institution Libraries

114 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
slender tips, at least as long as notopodial cirri in all except first
few branchiated setigers.
Anterior neuropodial acicular lobes rounded, from about
setiger 10 becoming increasingly obliquely conical with
aciculae emerging dorsal to midline. All presetal lobes low,
transverse folds. Anterior postsetal lobes about as high as
acicular lobes following outline of acicular lobes closely;
median and posterior postsetal lobes low folds. First 8 or 9
ventral cirri thick and tapering. Median ventral cirri basally
inflated. Inflated bases spherical; narrow tips short, nearly
button-shaped. Inflated bases reduced posterior to setiger 35,
absent in mid-posterior fragments; ventral cirri tapering in
posterior setigers. All notopodial cirri slender and tapering,
without articulations.
Limbate setae slender, nearly capillary with very narrow,
smooth limbations. Pectinate setae (Figure 34m) very small,
flat, flaring. One marginal tooth larger than other teeth; total of
10 teeth present. Shafts of compound falcigcrs (Figure 34n)
distally very slightly inflated and marginally serrated. Appendages
slender, with a very large head, bidentate. Proximal teeth
triangular, directed laterally; distal teeth sharply bent, truncate.
Guards symmetrically rounded, with sharply pointed mucros,
serrated along the cutting edge. Pseudocompound falcigers and
compound spinigers absent. Aciculae (Figure 34p) paired,
slender, yellow, tapering distally to slender, slightly curved or
bent tips; cross-section round. Separation between core and
sheath indistinct in both aciculae and subacicular hooks.
Subacicular hooks (Figure 34o) yellow, tridentate with teeth in
a crest. Hooks first present from setiger 33, present in all
setigers thereafter, always single (except for replacements).
Hooks slender, with large, triangular main fangs and smaller
teeth decreasing relatively evenly in size distally.
UNKNOWN MORPHOLOGICAL FEATURES.—Features associated
with posterior setigers; pygidium and anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 22, 56, 58, 59. Unknown
Characters: 1,2,16, 17, 23, 27-29, 37, 38,42.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—37,1;
38,1.
REMARKS.—Eunice congesta was considered a synonym of
E. vittata by Imajima and Hartman (1964:258); it is listed with
similar species in Tables 41 and 45. In addition to E. congesta,
E. mucronata has more than 15 branchial filaments. The two
species are very similar and cannot be safely separated on the
characters used in the key.
47. Eunice conglomerans Ehlers, 1887
FIGURE 35a-i; TABLES 33,36
Eunice conglomerans Ehlers, 1887:93-95, pi. 23: figs. 1-9, pi. 24: figs. 1-4.
MATERIAL EXAMINED.—One syntype, MCZ 706, Blake sta
10, 24°44X 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 2 h of body; dorsum strongly convex, especially in
anterior
x h 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 V2 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. Ceratophorcs ring-shaped in all antennae,
without articulations. Ccratostylcs digiliform, with 5 articulations
in A-I I and A-I 11 and 4 in A-I; all articulations cylindrical.
All antennae similar in length, barely reaching posterior margin
of peristomium. Pcristomium cylindrical wiih scoop-shaped
projecting lower lip. Separation between rings distinct dorsally;
vcntrally pcristomium also divided into 2 rings, but connection
between dorsal and ventral transverse grooves uncertain;
anterior ring 4 /s of total pcristomial length. Pcristomial 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