A Review of the Genus Eunice - Smithsonian Institution Libraries

302 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
Brazil, 23°49'S, 45°25'30"W, muddy beach intertidal zone, 21
June 1986, coll. A.E. Migotto and M.A. da Mota, 1 specimen.
Praia do Baraquec,aba, Sao Sebastiao, Brazil, 23°50'S,
45°26'W, fine sand, intertidal, 23 Jun 1986, coll. Moists A. da
Mota, 1 specimen.
COMMENTS ON MATERIAL EXAMINED.—The types are not
available; the two specimens examined come from the type
locality; they were made available by A.E. Migotto through P.
da Cunha Lana. The specimen illustrated and described is from
Praia do Baraquecaba.
DESCRIPTION.—Specimen described in detail complete with
706 setigers; total length 1455 mm; maximal width 23 mm at
setiger 25; length through setiger 10, 35 mm; width at setiger
10, 21 mm. Other specimen complete with 689 setigers; total
length 1370 mm; maximal width 20 mm at setiger 20; length
through setiger 10, 30 mm. Anterior part of body through
setiger 100 cylindrical with small parapodia; both dorsum and
ventrum convex. Body dorsoventrally flattened posteriorly,
tapering slowly over the last 250 setigers to posterior end,
which is ~5 mm wide. Anterior end abruptly tapering. Anal
cirri missing in both specimens. Both specimens dark-bronze
colored as preserved; anterior appendages and notopodial cirri
light colored with darker cross-bands or spots.
Prostomium (Figure 102a) distinctly shorter and narrower
than peristomium, as deep as l /2 of peristomium. Prostomial
lobes frontally obliquely, dorsally inflated; median sulcus
shallow, nearly vertically directed, narrow. Each prostomial
lobe divided longitudinally in large lateral part and smaller
medial part Lateral parts ovate, frontally and dorsally flattened,
sloping from high edge at junction with medial parts laterally;
medial parts inflated, frontally rounded. Antennae in a
horseshoe, with A-I directly in front of A-II; with A-III isolated
by a gap, similar in thickness. Bases of A-I and A-II located in
continuation of lines separating lateral from medial portions of
each half prostomial half; base of A-III at head of median
prostomial sulcus. Ceratophores long in A-I and ring-shaped in
other 3, without articulations. Ceratostyles slender and tapering,
none reaching beyond anterior peristomial ring, without
articulations. A-II thicker and somewhat longer than A-III.
Peristomium cylindrical, massive; lower lip muscular. Separation
between rings distinct dorsally and barely visible ventrally;
anterior ring 5 /6 of total peristomial length. Peristomial cirri
barely reaching beyond front edge of posterior peristomial ring,
basally inflated, without articulations.
Maxillary formula 1+1, 9+5, 6+0, 3+8, 1+1, and 1+1. All
teeth, except Mx VI slender, tapering and circular in
cross-section and strongly opalized with dark, nearly black tips.
Mx VI low, knife-edged ridges. Mx III long and located behind
left Mx II.
Branchiae (Figure 102e,k) present, pectinate, distinctly
longer than notopodial cirri; length of branchiae ~ 2 h width of
body where best developed, not reduced in mid-body region,
erecL Branchiae from setiger 7-14 to setiger 686. Branchiae
present to near posterior end, present on more than 65% of total
number of setigers. All except for last 3 pairs pectinate;
maximum 40 filaments from about setiger 35. Number of
filaments slowly reduced posteriorly; in last 200 segments less
than 20 filaments present in each branchia. Branchial stems
long, slender and tapering. All filaments longer than notopodial
cirri except in last 100 branchiated setigers.
Anterior neuropodial acicular lobes (Figure 102d) bilobed,
with aciculae emerging from depressions between halves;
neuropodial acicular lobes low, rounded to truncate from early
branchial setigers through rest of body. Presetal lobes low
transverse folds. Postsetal lobes follow outline of acicular lobes
closely. Anterior ventral cirri short, nearly conical with pointed
tips. Ventral cirri basally inflated from first branchial setigers;
inflated bases retained in all remaining setigers. From about
setiger 40 through setiger 500 ventral cirri thick, flattened
ridges supported on thick folds of tissue; distal lips entirely
absent. Far posterior ventral cirri with thick tapering tips. All
notopodial cirri with ventrally directed expansion attached near
bases; especially in anterior branchial region, this accessory
notopodial lobe pendant and nearly drop-shaped. Distal end of
anterior notopodial cirri conical, tapering to slender lips. Distal
end of median notopodial cirri tapering to slender tips,
becoming rather thick and nearly triangular in posterior
setigers. Notopodial cirri without articulations.
Limbale setae short, tapering and marginally pilose. Anterior
pectinate setae (Figure 102c,j) tapering, furled, becoming
nearly fiat in posterior setigers (Figure 102h). One marginal
tooth longer than other distinctly short, trim teeth; -12 teeth
present. Shafts of compound falcigers (Figure 102b, f.i) inflated
and marginally smooth; inner ends of shafts dark brown or
black in most setigers. Appendages long, slender, with nearly
parallel sides and a very small head, bidentate. Relative length
of appendages decreasing posteriorly. Proximal teeth triangular,
directed laterally. Distal teeth nearly erect in most hooks,
gently curved in some median setigers. Guards symmetrically
bluntly to sharply pointed, marginally smooth; mucros absent.
Pseudocompound falcigers and compound spinigers absent.
Aciculae usually numbering 3-4, black, tapering, blunt with
straight tips; cross-sections round. Separation of acicular cores
and sheaths indistinct. Subacicular hooks (Figure 102g) with
dark brown to black core and clear sheath, tapering to slender,
slightly curved, simple tips. Hooks first present from setiger 51
or 56, present in all setigers thereafter; multiple hooks in most
setigers, up to 4 hooks present.
UNKNOWN MORPHOLOGICAL FEATURES.—Anal cirri.
EXPECTED STATE OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 22, 56, 60. Unknown
Characters: 13, 14.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—This species was originally described with
bidentate subacicular hooks, which appear to be present in