A Review of the Genus Eunice - Smithsonian Institution Libraries

148 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
In E. floridana the peristomial cirri reach the middle of the
prostomium; in the other species, the peristomial cirri do not
outreach the peristomium.
70. Eunice franklini Monro, 1924
FIGURE 48a-e; TABLES 27,31
Eunice franklini Monro, 1924:56-57, figs. 14-16.—Fauchald, 1986:250-251.
figs. 41-45.
MATERIAL EXAMINED.—Holotype, BM(NH) ZK
1924.1.28.81, the Franklin Shoal, Arafura Sea, 9°53'S,
129°19'E.
DESCRIPTION.—Holotype incomplete, of unknown sex, with
92 setigers; length 105 mm; maximal width 7 mm at sctigcr 10;
length through setiger 10, 15 mm.
Prostomium (Figure 48a) distinctly shorter and narrower
than peristomium, less than x li as deep as peristomium.
Prostomial lobes frontally rounded, dorsally inflated; median
sulcus shallow. Antennae in transverse row, evenly spaced,
similar in thickness. Ceratophores ring-shaped in all antennae,
without articulations. Ceratostyles digitiform, with up to 10
irregular articulations in A-III. A-I to setiger 1; A-II to setiger
4 (only left present); A-III to setiger 7. Peristomium cylindrical.
Separation between rings distinct dorsally, barely visible
ventrally; anterior ring 5 /6 of total peristomial length. Peristomial
cirri to posterior x h of prostomium, slender and tapering,
with 5 indistinct articulations.
Maxillary formula 1+1, 6+7, 8+0, 6+9, and presumably 1+1
according to Monro (1924, fig. 16).
Branchiae (Figure 48e) present, pectinate, distinctly shorter
than notopodial cirri, not reduced in mid-body region (not
apparent in illustration), erect. Branchiae from setiger 6 to end
of fragment. First branchia with 5 filaments, maximum about
25 filaments. Branchial stems long, erect, shorter than
notopodial cirri. Filaments short, digitiform.
Neuropodial acicular lobes flattened conical; aciculae
emerging at midline. Anterior pre- and postsetal lobes distinct,
distally rounded in first 15 setigers, thereafter reduced to low
transverse folds. Anterior ventral cirri tapering, blunt. Ventral
cirri basally inflated in median setigers. Inflated bases
indistinct, ovate; narrow tips tapering. Notopodial cirri supported
by dark aciculae, very long, digitiform, without
articulations.
Shafts of pectinate setae (Figure 48b) wide, cylindrical.
Blades flat, slightly flaring. Both marginal teeth longer than
other teeth, with -12 teeth. Shafts of compound falcigers
(Figure 48d) slender, smoothly tapering, marginally smooth,
without beaks or internal striations. Appendages slender; heads
distinct, bidentate. Proximal and distal teeth similar in length;
proximal teeth narrowly triangular, directed laterally. Distal
teeth tapering, slimmer than proximal teeth, directed obliquely
distally. Guards symmetrically bluntly rounded, marginally
smooth; mucros absent. Pseudocompound falcigers and compound
spinigers absent. Aciculae, including 2 of 4 notopodial
aciculae, black, tapering, straight, pointed; cross-section round.
Subacicular hooks black (Figure 48c), bidentate. Hooks first
present from setiger 34; present in all setigers thereafter, always
single (except for replacements). Hooks slender, gently curved.
Both teeth similar in size. Proximal teeth triangular, directed
obliquely distally. Distal teeth slightly narrower than proximal
teeth, nearly erect.
UNKNOWN MORPHOLOGICAL FEATURES.—Relationship between
Mx III and left Mx IV; all features associated with far
posterior setigers, including branchial distribution; 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: 56. Unknown Characters:
1, 2, 13, 14, 36-38,40,42,47, 50, 51, 57-60. 74, 78.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—37,1;
38,1.
REMARKS.—Eunice franklini is listed with similar species in
Tables 27 and 31; justification for including the species in
group B-2 was given by Fauchald (1986).
The combination of very short, numerous branchial filaments
and extremely long notopodial cirri is unique to the
genus. In addition E. franklini has compound falcigers with
mucronate guards, a feature shared only with E. amphiheliae of
the species listed in Table 31. The two species are readily
separated on the relatively length of the branchiae; despite their
length, these are outreached by the notopodial cirri in E.
franklini and are distinctly longer than the notopodial cirri in E.
amphiheliae.
71. Eunice frauenfeldi Grube, 1866
FIGURE 48f-k; TABLES 27,32
Eunice frauenfeldiGrube, 1866c:175; 1867:11-12, pi. 1: fig.3.
MATERIAL EXAMINED.—Holotype, ZMB 4008, St. Paul's
Island, South Atlantic.
DESCRIPTION.—Holotype incomplete, of unknown sex, with
77 setigers; length 45 mm; maximal width 5 mm at setiger 10;
length through setiger 10, 7 mm. Body dorsally inflated and
ventrally flattened, with parallel sides and short parapodia.
Prostomium (Figure 480 distinctly shorter and narrower than
peristomium, as deep as V2 of the peristomium. Prostomial
lobes frontally obliquely transverse, dorsally excavate with
thickened rim; median sulcus shallow. Eyes not seen. Antennae
very large, in shallow horseshoe, evenly spaced, similar in
thickness. Ceratophores ring-shaped in all antennae, without
articulations. Ceratostyles tapering, with up to 14 articulations
in A-III; inner articulations cylindrical, becoming drop-shaped
distally. A-I to posterior peristomial ring; A-II to setiger 1;
A-III to setiger 2. Peristomium cylindrical, with distinct,
muscular lower lip. Separation distinct dorsally and ventrally;