A Review of the Genus Eunice - Smithsonian Institution Libraries

276
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
ring-shaped in all antennae, without articulations. Ceratostyles
slender and digitiform; maximum 5-6 long articulations in
A-II and III. Three median antennae to middle of setiger 1; A-I
to middle of peristomium. Peristomium with deeply flaring
pocket on dorsal side, otherwise conically expanding posteriorly.
Separation between rings distinct dorsally and ventrally;
anterior ring 5 /s of total peristomial length. Remnants of
peristomial cirri present.
Maxillary formula 1+1, 6+6, 8+0, 5+12, 2+1, and 1+1. Mx
III very short. Unusual features include 2 teeth on left Mx V
and presence of distinct Mx VI.
Branchiae present, palmate, distinctly shorter than notopodial
cirri, not reduced in mid-body region. Branchiae from
setiger 10 on left side and 13 on right side to setiger 110.
Branchiae terminating well before posterior end, present on
more than 65% of total number of setigers. Most branchiae
single, short filaments; some scattered segments with 2 or 3
short, cylindrical branchial filaments (Figure 92e); last few
filaments short, nearly button-shaped.
Neuropodial acicular lobes rounded in anterior setigers,
slightly more conical in posterior setigers; aciculae emerging
dorsal to midline. All pre- and postsetal lobes low, transverse
folds. First 9 ventral cirri digitiform. Ventral cirri distinctly
basally inflated in setigers 10 through setiger 30. Inflated bases
ovate; narrow tips tapering. Far posterior ventral cirri digitiform,
resembling notopodial cirri in shape and length. All
notopodial cirri basally slightly inflated, distally tapering with
slender, digitiform tips, without articulations.
Limbate setae slender, nearly capillary. Ten or more
pectinate setae in median and posterior setigers. Pectinate setae
(Figure 92c) flaring, flat. One marginal tooth longer and thicker
than other teeth; -15 teeth present. Shafts of compound
falcigers (Figure 92a) tapering, with poorly defined internal
striations, without marginal teeth. Appendages short, slender,
bidentate. Both teeth similar in size. Guards symmetrically
rounded; mucros absent Pseudocompound falcigers and
compound spinigers absent. Aciculae single anteriorly, paired
in median and posterior setigers, black, tapering. Aciculae
strongly projecting in median setigers; cross-sections knifeedged,
distally pointed. Subacicular hooks (Figure 92b) black,
bidentate. Hooks first present from setiger 35, present in all
setigers thereafter, always single (except for replacements).
Hooks tapering smoothly to small head. Proximal teeth about
twice as large as distal teeth; both teeth directed distally.
UNKNOWN MORPHOLOGICAL FEATURES.—Pygidium and
anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 34, 56, 58, 59. Unknown
Characters: 4, 6, 13, 14,27-29, 39,40, 42, 74, 78.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Eunice prognatha belongs to either group B-2
or to group B-4; the branchial start is exactly at the (rather
arbitrarily determined) breakoff point between the two groups.
It is listed with similar species in both groups (Tables 27 and
31, and Tables 33 and 36). It is unique in Table 31 in that it has
palmate branchiae with only three filaments; all other species in
this table have pectinate branchiae (i.e., a distinct, elongated
branchial stem is present). It is the only species listed in Table
36 with branchiae distinctly shorter than the notopodial cirri.
Mclntosh (1885) reported that the peristomial cirri reached
the frontal margin of the peristomium and that up to five
branchial filaments could be present in a branchia; neither one
of these statements can be confirmed.
9. Eunice pruvoti, new name
FIGURE 92f-l; TABLES 33.36
Eunice anceps Pruvol. 1930:69.
Eunice afra.—Fauvel in Pruvoi, 1930:69 (in ptrt. noi Eunice afra Peten,
1854|.
MATERIAL EXAMINED.—One syntype, MNHN, Paris, Kuts,
He de Pino, Nouvellc Caledonie, 1928, coll. Mmc Pruvot; 1
syntype, MNHN, Paris, Collection Francais, Nouvelle Caledonie,
forme jcunc no. 10.
COMMENTS ON MATERIAL EXAMINED.—Both syntypes are
currently labeled Eunice afra, and the labels are in Pierre
Fauvel's handwriting; the second specimen also has a label
naming it as "Eunice jeune no. 10." The small syntype is
nearly translucent, slender, and narrow and not distinctly
dorsally flattened; the anterior end has been deeply dissected
and the jaws are now missing. The description is based on the
larger of the syntypes.
DESCRIPTION.—Large syntype complete, of unknown sex,
with 115 setigers; total length 34 mm long; maximal width 3
mm; length through setiger 10, 5 mm. Anterior body
cylindrical, becoming dorsally flattened and rather wide with
crowded setigers by setiger 10; posterior end abruptly tapering
and flattened. Anal cirri as long as the last 15 setigers, without
articulations. Small syntype complete, of unknown sex, with
about 100 setigers; total length 22 mm; maximal width 1 mm
wide; length through setiger 10, 3 mm.
Prostomium (Figure 92f) distinctly shorter than peristomium,
distinctly narrower than peristomium, less than x li as
deep as peristomium. Prostomial lobes frontally truncate,
dorsally somewhat flattened; median sulcus deep. Palpal
regions set off by horizontal, frontal grooves. Eyes between
bases of A-I and A-II, large, dark. Antennae in a horseshoe,
evenly spaced, similar in thickness. Ceratophores ring-shaped
in all antennae, without articulations. Ceratostyles thick,
sausage-shaped, digitiform, with 1 or 2 cylindrical, distinct
articulations. Antennae to middle of anterior peristomial ring.
Peristomium slightly flaring anteriorly, with distinct, muscular
lower lip. Separation between rings distinct dorsally and
ventrally; anterior ring ~ A /s of total peristomial length.