A Review of the Genus Eunice - Smithsonian Institution Libraries

124 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
lae single in most parapodia, with dark brown to black cores
and clear sheaths, distally tapering to slender, gently curved
tips; cross-section round. Subacicular hooks (Figure 38g) with
dark brown to black cores and clear sheaths, bidentate. Hooks
first present from setiger 81, present in less than half the next
100 setigers, becoming more frequent in posterior half of body
and present in all setigers near posterior end of specimen,
always single (except for replacements). Hooks slender,
tapering smoothly, with very small heads. Proximal teeth
triangular and directed laterally; distal teeth nearly erect and
sharply tapered; at junction between teeth small, sharply
pointed bosses on both sides of hooks, making hooks appear
quadridentate in frontal view.
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 UNKNOWN MORPHOLOGICAL FEA-
TURES.—Mx III forms a distal arc with left Mx IV; branchiae
continued to near the posterior end.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 22, 56, 58, 59. Unknown
Characters: 1,2,11,12, 36-38,40,42.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—11,2;
12,2; 37,1; 38,1.
REMARKS.—Eunice djiboutiensis was distinguished from E.
aphroditois on the structure of the subacicular hooks. It is listed
with similar species in Tables 27 and 28. In contrast to E.
aphroditois, it lacks inflated bases to the posterior ventral cirri.
As usual in the genus, the very large specimens often lose the
subacicular hooks over large fractions of the body regions in
which they would be expected to be present. Gravier had two
specimens; the other specimen must have dissected for the jaw
structure because the specimen examined for this study had not
been dissected.
Eunice dubia Woodworth, 1907
Eunice dubia Woodworth, 1907:11-12, pi. 1: figs. 4-6, pi. 2: fig. 15.
Lysidice falax Woodworth, 1903:881.
REMARKS.—The name Eunice dubia was proposed for the
epitokous spawning ends of a palola by Woodworth. He had
previously referred to the same specimens as Lysidice falax. No
material is available and the illustration of the parapodia
indicates that no subacicular hooks or pectinate setae were
present. The species is here considered belonging to the genus
Palola.
54. Eunice dubitata Fauchald, 1974
FIGURE 39a-g; TABLES 4,24,25
Eunice dubitalus Fauchald, 1974b:18-21, fig. 2a-f [note original, incorrect
ending of species name].
MATERIAL EXAMINED.—Holotype and 3 paratypes, ZM
Bergen, 55042 and 55043, Hardangerfjorden, S of Huglhamaren,
59°48'42"N, O5°35'1O"E, 260-180 m, coral bottom,
Hardangerfjords-undcrsOkelscne St. Z13/59, Square H48-18, 6
Jun 1959.
COMMENTS ON MATERIAL EXAMINED.—Body shape and
parapodial structures arc difficult to identify properly because
of the poor fixation of the specimens.
DESCRIPTION.—Holotype incomplete, of unknown sex, with
-113 setigers; length 120 mm; maximal width 7 mm at setiger
10; length through setiger 10, 16 mm. Paratypes of unknown
sex; with 48 and 92 setigers; length 52 and 134 mm; maximal
width and length through setiger 10 about as in holotype. All
specimens basically cylindrical, with slightly flattened dorsum.
Prostomium (Figure 39c) distinctly shorter and narrower
than peristomium, as deep as '/2 of the pcristomium. Prostomial
lobes frontally rounded, dorsally inflated; median sulcus
shallow. Eyes between bases of A-I and A-II. Antennae in
shallow horseshoe, evenly spaced; A-I thicker than A-II and
A-I 11. Ccratophorcs ring-shaped in all antennae, without
articulations. Ceratostylcs of A-I basally slightly inflated; other
ccratostyles tapering, with up to 10 irregular articulations;
articulations basally cylindrical, becoming drop-shaped distally.
A-I to posterior pcristomial ring; A-II to setiger 1 in
holotype and sctigcr 3 in one paratype; A-I 11 to setiger 3 in
holotype and setiger 5 in one paratype. Antcnnal length of other
paratype resembling holotype closely. Peristomium cylindrical;
lower lip deeply scalloped. Separation between rings
distinct dorsally and ventrally; anterior ring 5 /6 of total
peristomial length. Peristomial cirri to posterior edge of
prostomium in holotype and middle of prostomium in
paratypes, slender and digitiform, with 4 to 7 articulations.
Maxillary formula of large paratype 1+1, 7+7, 6+0, 6+8,
1+1, and 1+1. Mx VI present. Mx III relatively long, but
forming distal arc with left Mx IV.
Branchiae (Figure 39g) present, palmate, distinctly shorter
than notopodial cirri, not reduced in mid-body region.
Branchiae from setiger 3 (4 and 5 in paratypes) to setiger 38 (38
and 48 in paratypes). Branchiae terminating well before
posterior end, on less than 55% of total number of setigers. First
several branchiae very short, button-shaped; occurrence of
branchiae from about setiger 25 very irregular. First 5-6 and
last 10-15 branchiae single filaments; maximum 3 filaments at
about setiger 10-20; even in this region most branchiae with 2
filaments only. Branchial stems reduced to short, basal area.
Filaments digitiform, shorter than notopodial cirri.
Neuropodial acicular lobes truncate or rounded; aciculae
emerging at midline. Pre- and postsetal lobes low, transverse
folds. Ventral cirri without inflation in -10 setigers. Bases
inflated from about setiger 10. Bases ovate; narrow tips
tapering. Inflated bases reduced from about setiger 35 and lost
by setiger 40. Remainder of ventral cirri thick, digitiform.
Anterior notopodial cirri basally inflated, tapering to long,
slender tips, with 5 to 7 articulations. Notopodial cirri without
articulations by setiger 20, reaching nearly middle of body in
most setigers.