A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 221
articulations in A-111. A-I to posterior peristomial ring; A-II and
A-III to setiger 3; A-I 11 slightly longer than A-II. Peristomium
cylindrical. Separation between rings distinct nearly all way
around body, indistinct only for short stretch laterally; anterior
ring 5 /6 of total peristomial length. Peristomial cirri to middle of
prostomium, slender and tapering, with 5 indistinct articulations.
Maxillary formula of specimen from ZMW 1062 1+1, 6+6,
10+0, 4+8, 1+1, and 1+1. Mx III with very short, small teeth,
forming an arc with left Mx IV. Mx VI small plate with small
point on either side.
Branchiae (Figure 73d,i,j) present, pectinate, distinctly
shorter than notopodial cirri, reduced in mid-body region,
flexible. Branchiae from setiger 7-8 to setiger 127. Branchiae
present to near posterior end, present on more than 65% of total
number of setigers. All anterior and posterior branchiae with 2
or more filaments, in median region, from about setiger 35 to
65, branchiae reduced to single, relatively long filaments
(Figure 73i). Maximum -8 filaments at about setiger 15.
Filaments short, digitiform.
Anterior neuropodial acicular lobes rounded; posterior
acicular lobes triangular or conical; aciculae emerging at
midline. All prc- and postsetal lobes low, transverse folds.
Anterior ventral cirri thick, tapering, becoming basally inflated
from about setiger 10. Inflated bases distinct transverse welts;
narrow tips tapering. Inflated bases reduced from about setiger
55-60, completely missing from about setiger 60-65. Posterior
ventral cirri tapering, broadly attached ventrally, nearly
scoop-shaped. All notopodial cirri digitiform, with 2 or more
articulations. Anterior notopodial cirri about as long as
peristomial cirri, becoming shorter from about setiger 3, but
very much longer than branchiae in all setigers, retaining about
same length from setiger 10 through rest of body, becoming
slowly slimmer. Notopodial cirri articulated throughout body.
Limbate setae marginally serrated. All pectinate setae
(Figure 73d,g,k) tapering, flat. Both marginal teeth slightly
longer than other teeth; number of teeth increasing from -15 to
-20 posteriorly. Shafts of pectinate setae increasing in length
posteriorly. Pectinate setae numbering -10 in all parapodia.
Shafts of compound falcigers (Figure 73c, 0 tapering, with
distinct distal beak, marginally smooth, with distinct internal
striations. Appendages elongated with parallel sides anteriorly
(Figure 73c), becoming shorter and distinctly tapering posteriorly
(Figure 730, bidentate. Proximal and distal teeth similar in
size. Proximal teeth triangular, directed laterally. Distal teeth
gently curved. Anterior guards symmetrically rounded, becoming
symmetrically bluntly pointed in posterior setigers; mucros
absent. Pseudocompound falcigers and compound spinigers
absent. Aciculae (Figure 73e) at least paired, up to 4 present,
with dark brown, nearly black cores and clear sheaths, tapering
with slender tips, bent or curved dorsally; cross-sections round.
Subacicular hooks (Figure 73h) with dark brown, nearly black
cores and clear sheaths, bidentate. Hooks first present from
setiger 38 or 41, present in all setigers thereafter, 2 in most
setigers; 3 or more in some setigers. Proximal teeth larger than
distal teeth, triangular, directed laterally. Distal teeth nearly
erect.
UNKNOWN MORPHOLOGICAL FEATURES.—None.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 56, 58, 59. Unknown
Characters: 4,6.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—The species belongs to group B-2 and is
compared to similar species in Tables 27 and 29. A
characteristic feature is the reduced number of branchial
filaments in median region of body; this pattern is present in E.
antennata and a few similar species in group C-2, but is
otherwise not known to be present in any other species in the
genus.
123. Eunice mindanavensis Mclntosh, 1885
FIGURE 731-p; TABLES 27,30
Eunice mindanavensis Mclntosh, 1885:289-291, figs. 50,51, pi. 39: figs. 9,10,
pi. 20A: figs. 21, 22.
MATERIAL EXAMINED.—Holotype, BM(NH) ZK
1885.12.1.51a, off Mindanao, Philippines, 7°3'N, \2\°AVE,
148 and 186 m, stones and gravel, 26 Oct 1874, Challenger sta
201.
COMMENTS ON MATERIAL EXAMINED.—The holotype is
now in three pieces; an anterior end consisting of 21 setigers
(cut into two pieces) and a posterior end of 42 setigers. The two
pieces clearly belong to the same specimen and appear to
represent a complete specimen. Mclntosh reported only the first
of the two depths listed above; Alex Muir (in litL) informed me
that station 201 included hauls at two different depths.
DESCRIPTION.—Holotype complete with 63 setigers; total
length -40 mm; maximal width 4 mm; length through setiger
10, 7 mm. Body thickset anteriorly, circular in cross-section,
tapering strongly, with relatively few, very distinct segments.
Prostomium (Figure 731) distinctly shorter and narrower than
peristomium, less than l /i as deep as peristomium. Prostomial
lobes frontally rounded; dorsally flattened lobes; median sulcus
deep. Eyes not seen. Antennae covered by large overhanging
peristomial fold, similar in thickness. Ceratophores ring-shaped
in all antennae, without articulations. Ceratostyles tapering and
slender, with up to 15 relatively long, rather indistinct,
cylindrical articulations. A-I to setiger 1, A-II to setiger 3; A-III
to setiger 7. Peristomium roughly cylindrical. Separation
between rings distinct dorsally and possibly ventrally; separation
on ventral side confounded by presence of superficial
folds; anterior ring ~ 6 fr of total peristomial length. Peristomial
cirri to tip of prostomium, tapering, with 7 long, cylindrical
articulations.