A Review of the Genus Eunice - Smithsonian Institution Libraries

232 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
10, 8.5 mm. Anterior body cylindrical, becoming dorsoventrally
flattened by setiger 50. Abruptly tapering to pygidium.
Anal cirri short, without articulations.
Prostomium (Figure 77d) distinctly shorter and narrower
than peristomium, less than l /2 as deep as peristomium.
Prostomial lobes frontally rounded, dorsally flattened; median
sulcus deep. Eyes lateral to bases of A-II, dark. Antennae in a
horseshoe, evenly spaced, with A-I thicker than other 3.
Ceratophores ring-shaped in all antennae, without articulations.
Ceratostyles tapering, without articulations. A-I barely to
posterior peristomial ring; A-II to setiger 1; A-I 11 to setiger 2.
Peristomium cylindrical; lower lip very muscular, forming
distinct ventrolateral pad. Separation between rings distinct
dorsally and ventrally only; anterior ring 4 /s of total peristomial
length. Peristomial cirri to front edge of peristomium or
posteriormost part of prostomium, basally inflated, tapering to
slender tips, without articulations.
Summary maxillary formula 1+1, 4-544-5, 6fO, 4-6+6-8,
and 1+1. Left Mx IV short; part of distal arc with Mx III, with
3 large and varying number of very small, knob-like teeth.
Branchiae (Figure 77a) present, pectinate, distinctly longer
than notopodial cirri, not reduced in mid-body region, flexible.
Branchiae from setiger 17-18 to setiger 196. Branchiae present
to near posterior end; present on more than 65% of total number
of setigers. First 2-3 pairs single filaments; all other branchiae
with 3 or more filaments. Where best developed, at about
setiger 25, branchiae with 12 slender filaments; more usually
branchiae with 8 to 9 filaments. Branchial stems slender,
flexible. Filaments longer than notopodial cirri in all but first
few and last 15-20 setigers.
Anterior neuropodial acicular lobes truncate, becoming
rounded by setiger 10 and conical by setiger 30, retaining that
shape through rest of body; aciculae emerging above midline.
All presetal lobes low, transverse folds. Anterior postsetal lobes
higher than acicular lobes, distally rounded, becoming reduced
to low, transverse folds by setiger 25. Anterior ventral cirri
thick, tapering, becoming basally inflated from setiger 10,
retaining inflated condition through rest of body. Inflated bases
gradually decreasing in importance posteriorly, forming low
transverse ridges in posterior half of body; narrow tips tapering.
All notopodial cirri slightly inflated basally, tapering to
digitiform tips; those in first 3-4 setigers distinctly longer than
those in next following setigers. Notopodial cirri decreasing
slowly in length over remainder of body, becoming about half
as long in last few setigers as in setiger 10. Notopodial cirri
without articulations.
Limbate setae marginally smooth. Pectinate setae (Figure
77b) in distinct fascicles of 15-20 in median and posterior
setigers, furled, flared. Both marginal teeth longer than other
teeth; 1 marginal tooth distinctly longer than other; -20 teeth
present. Shafts of compound falcigers (Figure 77c) slightly
inflated, marginally smooth, with distinct internal striations.
Appendages very large, tapering slightly to large heads,
bidentate. Proximal teeth slightly larger than distal teeth,
triangular, directed laterally. Distal teeth gently curved or
nearly erect. Guards symmetrically rounded, marginally
smooth; mucros absent. Pseudocompound falcigers and compound
spinigers absent. Aciculae projecting, with light to
medium brown cores and clear sheaths, tapering, usually
straight, slightly curved dorsally in some parapodia; crosssections
round. Subacicular hooks (Figure 77e) with light to
medium brown cores and clear sheaths, bidentate. Hooks first
present from setiger 22-23, present in all setigers thereafter,
always single (except for replacements). Hooks tapering
strongly to very small heads. Proximal teeth very much larger
than distal teeth. Both teeth directed distally.
UNKNOWN MORPHOLOGICAL FEATURES.—Pygidium.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 22, 56, 60. Unknown
Characters: 4,6.
ASSUMED STATES FOR PURPOSE OF PRF.PARING KEY.—
None.
REMARKS.—Eunice mutabilis is one of many species in
group B-4 described from the Red Sea by Gravier, it has been
considered synonymous with E. afra and is listed with similar
species in Tables 33 and 38. It is the only species in Table 38
with more than 10 branchial filaments and with the bases of the
ventral cirri inflated through posterior setigers.
130. Eunice mutilata Webster, 1884
FIGURE 77f-n; TABLES 27,31
Eunice mutilata Webster, 1884:315-316, pi. 9: figs. 36,36i-d, 37-40.
MATERIAL EXAMINED.—Holotype, USNM 4789, 1 specimen
in 3 pieces, plus 5 mounted slides of parapodia, Bermuda,
coll. G. Brown Goode.
COMMENTS ON MATERIAL EXAMINED.—The type lot consists
of an anterior end, a median piece, and a long section with
a posterior end; however, perhaps as much as 50 middle
setigers are missing. The three pieces match in all characters
and are here considered part of the holotype, but because an
unknown number of setigers are missing, no overall measurements
can be given.
DESCRIPTION.—Anterior end with 36 setigers; length 30
mm; maximal width 3.5 mm wide at setiger 10; length through
setiger 10, 10 mm.
Prostomium (Figure 77f) distinctly shorter and narrower
than peristomium, as deep as x li of peristomium. Prostomial
lobes frontally rounded, dorsally strongly inflated; median
sulcus deep. Eyes between bases of A-I and A-II, small, black.
Antennae in a straight line, evenly spaced, similar in thickness.
Ceratophores ring-shaped in all antennae, without articulations.
Ceratostyles tapering, with up to 5-6 very indistinct, cylindrical
articulations. A-I to posterior peristomial ring; A-II to
setiger 1; A-III to setiger 2. Peristomium cylindrical. Separa-