A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 109
Presetal lobes low, transverse folds. Anterior postsetal lobes as
high as acicular lobes, projecting as free lobes on ventral sides
of acicular lobes, becoming reduced to low, transverse folds
from about setiger 25. First 4 ventral cirri thick, tapering.
Ventral cirri basally inflated from setiger 5; inflated portion
forming thick transverse ridges; narrow tips tapering. Inflated
bases becoming reduced from about setiger 55; ventral cirri
from about setiger 70 slender, tapering, about as thick as
notopodial cirri. Notopodial cirri supported by internal aciculae
in all setigers. Anterior notopodial cirri basally inflated, short,
tapering, becoming slightly longer and distinctly narrower in
the last 50 setigers present. All notopodial cirri without
articulations, relatively short.
Limbate setae marginally smooth. Shafts of pectinate setae
slender, cylindrical. Blades of anterior pectinate setae (Figure
32c) slightly flaring, becoming more distinctly flaring in
posterior setigers (Figure 32c). One marginal tooth slightly
longer than other teeth; -12 teeth present. Shafts of compound
falcigers (Figure 32b, 0 slightly inflated, marginally smooth,
without internal striations or distal beaks. Appendages short,
tapering, with large heads, bidentate. Proximal teeth larger than
distal teeth, narrow-based triangular, directed laterally, but
tilted distally in anterior setigers (Figure 32f), directed distally
(Figure 32b) in posterior setigers. Distal teeth tapering,
distinctly bent in anterior setigers and gently curved in
posterior setigers. Guards symmetrically bluntly pointed in and
marginally serrated anterior setigers, rounded and marginally
smooth in posterior setigers, without mucros. Pseudocompound
falcigers and compound spinigers absent. Aciculae
single, light copper-colored in anterior setigers, becoming
distinctly darker brown in posterior setigers, distinctly projecting,
thick, tapering, straight, cross-section round. Subacicular
hooks (Figure 32d) copper- to chestnut-colored, bidentate.
Hooks first present from setiger 28 or 30, present in all setigers
thereafter, always single (except for replacements). Hooks
tapering to narrow, bent necks and distinct head. Proximal teeth
larger than distal teeth, directed laterally, but tilted distally.
Distal teeth shorter than proximal teeth, blunt, directed
obliquely laterally.
UNKNOWN MORPHOLOGICAL FEATURES.—Features associated
with far posterior setigers; pygidium and anal cirri.
EXPECTED STATES OF SELECTED UNKNOWN FEATURES.—
Branchiae missing on posterior half of body.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 22, 56, 58, 59. Unknown
Characters: 1,2, 38-40,42, 74, 78.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—38,2.
REMARKS.—Eunice coccinioides is listed with similar
species in Tables 24 and 26. It is characterized by the
copper-chestnut colored aciculae and subacicular hooks, which
sets it apart from other species in the group. The subacicular
hooks have a distinctly bent neck and the proximal teeth of the
subacicular hooks are distally tilted up, resembling the
condition in some of the abranchiate species in group B-4.
43. Eunice collaris Grube, 1869
FIGURE 33; TABLES 33,35
Eunice collaris Grube, 1869:494-495 [in part].
MATERIAL EXAMINED.—Three syntypes, ZMB F500, F501,
and F2035, Tor, Red Sea, among corals, coll. Ehrenberg.
COMMENTS ON MATERIAL EXAMINED.—None of the syntypes
are complete, two are very soft and generally in bad
shape, but are sufficiently complete, and so distributional
features can be identified as can the shapes of the setae. The
syntype from F500 is in very good condition and is here
described in detail.
DESCRIPTION.—Syntype from F500 incomplete with 56
setigers; length 44 mm; maximal width 6 mm at setiger 10;
length through setiger 10, 12 mm. Anterior end cylindrical,
frontally truncate; body becoming dorsally flattened towards
posterior end of fragment.
Prostomium (Figure 33a) distinctly shorter and narrower
than peristomium, as deep as l /2 of the peristomium. Prostomial
lobes frontally rounded, dorsally flattened; median sulcus deep.
Eyes present posterior to bases of A-I. Antennae evenly spaced,
similar in thickness. Ceratophores ring-shaped in all antennae,
without articulations. Ceratostyles digitiform; maximum 8
articulations in A-I 11; articulations cylindrical basally, becoming
drop-shaped, nearly moniliform distally. A-I to setiger 1;
A-I I to setiger 2 and A-I 11 to setiger 4. Peristomium cylindrical;
lower lip slightly inflated, distinctly muscular. Separation
between rings well marked dorsally and ventrally and faintly
visible laterally; anterior ring - 3 A of total peristomial length.
Peristomial cirri short and digitiform; articulations absent.
Jaws not examined.
Branchiae (Figure 330 present, pectinate, distinctly longer
than notopodial cirri, not reduced in mid-body region, flexible.
Branchiae from setiger 17 (18 in other specimens) to end of
incomplete specimens. All branchiae pectinate with up to 12
filaments at about setiger 50. Branchial stem weak, flexible.
Branchial filaments long, slender.
Neuropodial acicular lobes symmetrically rounded; aciculae
emerging at midline. All presetal lobes low folds. Anterior
postsetal lobes distinct ridges behind acicular lobe; median and
posterior postsetal lobes low, transverse folds. First 3-4 ventral
cirri thick and tapering. Median ventral cirri slightly inflated
basally. Inflated bases ovate; narrow tips tapering. Inflated
bases totally lost by setiger 50; posterior ventral cirri thick and
tapering. All notopodial cirri distinctly inflated basally, and
tapering to long tips; basal inflated region especially distinct in
setigers 5-25, without articulations.
Limbate setae slender, marginally serrated. Pectinate setae
(Figure 33e), numbering up to 12 in a parapodium, tapering,
furled into shallow scoops; 1 marginal tooth distinctly longer
than other teeth; -15 teeth present. Shafts of compound
falcigers (Figure 33d) slightly inflated, very finely marginally
serrated. Appendages long, tapering; head distinct, bidentate.