A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 163
Prostomium (Figure 52f) distinctly shorter and narrower
than peristomium, as deep as V2 of peristomium. Prostomial
lobes short, frontally rounded, dorsally inflated; median sulcus
short. Antennae in a nearly complete circle and directed
forwards, evenly spaced, similar in thickness. Ceratophores
ring-shaped in all antennae, without articulations. Ceratostyles
digitiform, with 2 or 3 cylindrical articulations in A-II and
A-III. A-I to middle of anterior peristomial ring; A-II to middle
of anterior peristomial ring; A-III to posterior edge of anterior
peristomial ring. Peristomium more than twice as long as
prostomium, cylindrical with a ventral depression anteriorly.
Peristomium divided ventrally into 3 equally long parts;
posteriormost of these parts distinct also dorsally representing
posterior peristomial ring, separation indistinct laterally.
Peristomial cirri barely reach front edge of posterior peristomial
ring, tapering, without articulations.
Jaws missing.
Branchiae present, distinctly longer than notopodial cirri, not
reduced in mid-body region. Branchiae from setiger 19 to
sctigcr 224. Branchiae present to near posterior end, present on
more than 65% of total number of setigers. First 10 branchiae
single filaments, thereafter some segments with 2 filaments,
others with single filaments, up to 'A of segments in branchial
region, without branchiae. Branchiae very long (Figure 52g),
slender, digitiform, outreaching notopodial cirri in all but a few
posterior branchial segments.
Anterior neuropodial acicular lobes distally symmetrically
rounded; posterior acicular lobes triangular with prominently
projecting aciculae; aciculae emerging at midline. All presetal
lobes low transverse folds. Anterior postsetal lobes higher than
acicular lobes, distally rounded; postsetal lobes reduced to low
folds by beginning of branchial region. First 6-7 ventral cirri
digitiform. Ventral cirri becoming basally inflated in median
setigers. Bases ovate; narrow tips short and button-shaped.
Inflated bases continued through rest of body. Notopodial cirri
tapering, similar in length except shorter in first 2 segments.
Notopodial cirri without articulations.
Limbate setae slender, marginally frayed. Pectinate setae
(Figure 52i) relatively large, but very delicate, flaring, flat.
Both marginal teeth distinctly longer than other teeth, with 15
teeth. Shafts of compound falcigers (Figure 52h) distally
inflated, marginally smooth. Appendages tapering; head small,
bidentate. Proximal teeth considerably larger than distal teeth,
tapering, directed slightly distally. Distal teeth gently curved,
tapering. Guards symmetrically rounded; mucros absent.
Pseudocompound falcigers and compound spinigers absent.
Aciculae single, black, distally tapering to blunt, straight tips;
cross-sections round. Subacicular hooks (Figure 52j) black,
bidentate. Hooks first present from setiger 36, present in all
setigers thereafter, always single (except for replacements).
Hooks abruptly tapered with small heads; both teeth directed
distally, very small, blunt.
UNKNOWN MORPHOLOGICAL FEATURES.—Jaw structure;
pygidium and anal cirri.
EXPECTED STATES OF SELECTED UNKNOWN FEATURES.—
Mx III short and forming part of distal arc with left Mx IV.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 34, 56, 60. Unknown
Characters: 13, 14,40, 74, 78.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Eunice guanica is listed with similar species in
Tables 33 and 36. It is one of three species in Table 36 in which
the bases of the ventral cirri remain inflated through posterior
setigers; the other two species are E. cirrobranchiata and E.
excariboea. In the latter the branchiae do not start until setigers
78-79; in the two former, branchiae are present from about
setigers 19 and 28 respectively. In E. cirrobranchiata at least
some of the subacicular hooks are tridentate with the teeth in
tandem; all subacicular hooks are bidentate in E. guanica.
Eunice guildingi Baird, 1869:351.
81. Eunice guildingi Baird, 1869
FIGURE 53a -e; TABLES 27,31
MATERIAL EXAMINED.—Holotype, BM(NH) 1839.12.27.5,
St. Vincent, West Indies.
DESCRIPTION.—Holotype complete, of unknown sex, with
258 setigers; total length 138 mm; maximal width 6 mm at
setiger 10; length through setiger 10, 7 mm.
Prostomium (Figure 53a) distinctly shorter and narrower
than peristomium, less than x li as deep as peristomium.
Prostomial lobes frontally rounded, dorsally inflated; median
sulcus deep. Eyes not observed. Antennae in horseshoe, evenly
spaced, similar in thickness. Ceratophores ring-shaped in all
antennae, without articulations. Ceratostyles digitiform; A-I
without articulations; A-II and A-III with up to 7 long,
cylindrical articulations. A-I to posterior peristomial ring. A-II
to posterior edge of setiger 1; A-III to setiger 2. Peristomium
slightly flaring anteriorly, with distinct muscular lower lip.
Separation between rings distinct on all sides; anterior ring ~ 3 A
of total peristomial length. Peristomial cirri to middle of
prostomium, slender and digitiform, without articulations.
Maxillary formula 1+1, 5+5, 7+0, 6+8, and 1+1.
Branchiae (Figure 53e) present, pectinate, distinctly longer
than notopodial cirri, not reduced in mid-body region, erect.
Branchiae from setiger 5 to setiger 236. Branchiae terminating
well before posterior end, more than 65% of total number of
setigers. First branchia with 3 filaments; maximum 11
filaments at setiger 15. From about setiger 40 number of
filaments reduced rapidly and by setiger 60 2 filaments
remaining. Last 20 branchiae single filaments. Posterior to
setiger 50 filaments short and easily overlooked. Branchial
stems slender, cylindrical, longer than notopodial cirri. Filaments
filiform, longer than notopodial cirri.
Anterior neuropodial acicular lobes broadly rounded; median
and posterior acicular lobes asymmetrically rounded;