A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 245
Eunice oliga papeetensis (Chamberlin, 1919)
leodice oliga papeetensis Chamberlin, 1919a:248-249
REMARKS.—Originally described as subspecies, this form is
here considered a distinct species and described as such below.
140. Eunice ornata Andrews, 1891
FIGURE 81f-o; TABLES 12, 46,48
Eunice ornata Andrews, 1891:284-285, pi. 13: figs. 6-13.
MATERIAL EXAMINED.—Eight syntypes, USNM 4874 and
4875, Beaufort, North Carolina, 1885.
COMMENTS ON MATERIAL EXAMINED.—Data for all syntypes
is summarized in Table 12. Syntype in USNM 4875 is a
juvenile, apparently of the same species, but is not further
considered in this description.
DESCRIPTION.—Syntype described complete with 110 setigers;
total length 45 mm; maximal width 2 mm wide; length
through setiger 10, 6 mm. Body cylindrical, slightly dorsoventrally
flattened posteriorly. Anal cirri slender, as long as last 15
setigers combined, without articulations.
Prostomium (Figure 81i) distinctly shorter and narrower than
peristomium, less than ! /2 as deep as peristomium. Prostomial
lobes frontally rounded, dorsally strongly inflated; median
sulcus deep. Palpal regions distinct by frontal grooves. Eyes
between bases of A-I and A-II, indistinct. Antennae in a
horseshoe, evenly spaced, similar in thickness. Ceratophores
ring-shaped in all antennae, without articulations. Ceratostyles
slender and tapering, with up to 15 moniliform to drop-shaped
articulations in A-III. A-I to posterior peristomial ring; A-II to
setiger 1; A-III to setiger 3. A-III always longer than A-II.
Peristomium cylindrical, with distinct muscular lower lip.
Separation between rings distinct dorsally and ventrally,
indistinct only over a very short lateral distance; anterior ring
3 A of total peristomial length. Peristomial cirri to posterior edge
of prostomium or front edge of peristomium, slender and
tapering, with up to 7 long, cylindrical articulations; most
specimens with 4 to 5 articulations.
Summary maxillary formula 1+1, 8+8-9, 7-9+0, 6+9-10,
and 1+1. Mx III long, located behind left Mx II.
Branchiae (Figure 81h) present, pectinate, distinctly longer
than notopodial cirri, reduced in mid-body region in some
syntypes, erect. Branchiae from setiger 5 to setiger 110.
Branchiae present to near posterior end, present on more than
65% of total number of setigers. Only first branchiae single
filaments; all other branchiae with 3 or more filaments, up to 20
filaments present. Branchial stems erect, tapering. Filaments
about as long as notopodial cirri in anterior and median
setigers, slender and digitiform. In second half of body number
of filaments reduced to 3 (Figure 81j); filaments decreasing in
length so in last
l h of body notopodial cirri longer than
branchiae. Most specimens with no increase in number of
filaments towards posterior end; in 1 specimen an increase to 4
filaments in posterior end was noted
Anterior neuropodial lobes asymmetrically conical with
aciculac emerging on dorsal side; farther posteriorly acicular
lobes become flattened and symmetrically rounded; aciculac
emerging at midline. All presetal lobes obliquely transverse
folds. Anterior postsetal lobes forming collars, about as high as
acicular lobes; by setiger 30 postsetal lobes reduced to low,
transverse folds. First 9 ventral cirri thick and tapering. Bases
of ventral cirri inflated, with nearly spherical glandular
structure from about setiger 10 to setiger 35-40; narrow tips
digitiform. Inflated bases reduced over next 5-10 setigers. Far
posterior ventral cirri slender and digitiform, very nearly as
long as notopodial cirri. Anterior notopodial cirri tapering, with
3 to 5 articulations. Articulations lost in first branchial setigers;
all other notopodial cirri slender, tapering, increasingly more
prominent as branchiae become reduced.
Limbate setae marginally frayed. Anterior pectinate setae
(Figure 8 If) tapering, furled. Both marginal teeth of about same
length; 10 teeth present. Median and posterior pectinate setae
(Figure 8In) slightly flaring, flat. One marginal tooth distinctly
longer than other teeth; -15 teeth present. Shafts of compound
falcigers (Figure 81g,l) slightly inflated, marginally serrated.
Anterior appendages tapering, bidentate. Proximal teeth shorter
than distal teeth, slender, directed laterally. Distal teeth slender,
directed obliquely distally. Posterior appendages bidentate with
proximal teeth longer than distal teeth, triangular, directed
laterally. Distal teeth tapering, bent. Guards asymmetrically
bluntly pointed, marginally serrated; mucros absent. Pseudocompound
falcigers and compound spinigers absent. Aciculae
yellow; anterior aciculae tapering to blunt cones, bent;
cross-section round. Median and posterior aciculae (Figure
81k) flattened in anterior-posterior axis with distal end
distinctly bidentate, bent dorsally. Proximal teeth larger than
distal teeth (Figure 81m), directed laterally. Distal teeth erect.
Separation between core and sheath indistinct in both aciculae
and subacicular hooks. Subacicular hooks (Figure 8I0) yellow,
tridentate with teeth in a crest. Hooks first present from setiger
22-25, present in all setigers thereafter, always single (except
for replacements). Hooks with large main fang and 2 distal
fangs emerging from common base.
UNKNOWN MORPHOLOGICAL FEATURES.—Pygidium
anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 56, 58, 59. Unknown
Characters: 4, 6,42.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Eunice ornata is listed with similar species in
Tables 46 and 48. The structure of median and posterior
aciculae is unusual as is the shift between pectinate setae with
even marginal teeth to ones with one long marginal tooth from
anterior to posterior setigers. It has up to 20 branchial
and