A Review of the Genus Eunice - Smithsonian Institution Libraries

240 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
and A-II. Antennae in a horseshoe, evenly spaced, with A-III
thicker than other four. Ceratophores ring-shaped in all
antennae, without articulations. Ceratostyles tapering, with up
to 20 short, cylindrical articulations in A-III. A-I to middle of
anterior peristomial ring; A-II to seuger 3; A-III to setiger 6.
Peristomium cylindrical. Separation between rings visible only
dorsally between bases of peristomial cirri; anterior ring 4 /s of
total peristomial length. Peristomial cirri to middle of prostomium,
slender, with 7 articulations.
Jaws missing. Illustration in Schmarda (1861) indicating a
maxillary formula of 1+1, 4+5, 6+0, +6, and 1+1. Mx III
forming part of distal arc with left Mx IV. Mx VI possibly
present.
Branchiae (Figure 80b) present, pectinate, distinctly longer
than notopodial cirri, not reduced in mid-body region, erect.
Branchiae from setiger 6 on one side and setiger 7 on other side
to setiger 180. Branchiae present to near posterior end, present
on more than 65% of total number of setigers. All branchiae
with 2 or more filaments; maximum 18 filaments present.
Branchial stems thick, tapering, erect. Filaments distinctly
shorter than notopodial cirri in all branchial setigers, thick,
digitiform.
Anterior neuropodial acicular lobes distally truncate, becoming
obliquely truncate by setiger 25, symmetrically conical by
setiger 100; aciculae emerging dorsal to midline. All pre- and
postsetal lobes low, transverse folds. First 4 ventral cirri
tapering. Ventral cirri distinctly inflated between setiger 5 and
setiger 30. Inflated bases ovate; narrow tips tapering. Inflated
bases decreasing in importance from about setiger 30; upper
face of cirri becoming excavated to form shallow scoops
covering lower edge of neuropodia. Scoops becoming shallower
in far posterior setigers; last few setigers with slender,
tapering ventral cirri. All notopodial cirri basally inflated,
tapering to slender tips, with up to 7 articulations in
prebranchial setigers; numbers of articulations reduced to 3 by
last setigers. Notopodial cirri dominant parapodial features in
most setigers, becoming increasingly dominant in last setigers
present.
Limbate setae slender, marginally serrated. Pectinate setae
(Figure 80d) in thick fascicles in median and posterior setigers,
tapering, flat. Both marginal teeth distinctly longer than other
teeth; 15 teeth present. Shafts of compound falcigers (Figure
80c) tapering, marginally smooth. Appendages relatively short,
bidentate. Both teeth of same size. Proximal teeth triangular,
directed laterally. Distal teeth directed obliquely distally.
Guards symmetrically bluntly pointed; mucros absent. Pseudocompound
falcigers and compound spinigers absent. Notopodial
aciculae paired, brown. Aciculae (Figure 80e) paired in
most setigers, with brown cores and clear sheaths, tapering to
slender tips, curved; cross-section round. Subacicular hooks
(Figure 800 with brown cores and clear sheaths, bidentate.
Hooks first present from setiger 30, present in all setigers
thereafter, always single (except for replacements). Hooks
slender, tapering. Proximal teeth distinctly larger than distal
teeth, directed laterally. Distal teeth curved.
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: 56, 58, 59. Unknown
Characters: 40,42.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Eunice nigricans was considered a synonym of
E. macrobranchia by Augener (1925), which lead Hartman
(1959:313) to refer it to E. aphroditois, based on the synonymy
of E. macrobranchia with E. aphroditois proposed by
Mclntosh (1905). The species belongs to group B-2 as do other
two taxa named; they arc compared to other tax a in the group
in Table 27. In contrast to E. aphroditois, which lacks
articulations of the ceratostyles and notopodial cirri, both £.
macrobranchia and E. nigricans have articulated ceratostyles
and, in the case of the latter, also articulated noiopodial cirri.
Among the species listed in Table 29, peristomial cirri well
outreach the peristomium in E. kinbergi, E. microprion, E.
nigricans, E. philocorallia, and E. plicata; in the other species,
including E. macrobranchia, the peristomial cirri are considerably
shorter. Of the species with long peristomial cirri, E.
philocorallia and E. microprion have short branchiae; in the
other species the branchiae are about as long as the notopodial
cirri or clearly outreach them. In E. nigricans posterior ventral
cirri are tapering from the bases, in E. kinbergi posterior ventral
cirri are scoop-shaped, and in E. plicata bases of posterior
ventral cirri are inflated and welt-shaped.
136. Eunice northioidea Moore, 1903
FIGURE 80g-m; TABLES 27,32
Eunice northioidea Moore, 1903:433-435, pi. 25: figs. 36-38.
MATERIAL EXAMINED.—Holotype, USNM 15728, Albatross
sta 3718, Japan, 1.2 miles off Ose Zaki, Honshu Island,
(-35°02X 138°47'E) 11 May 1900, 117 m, volcanic sand,
shells and rock, beam trawl.
DESCRIPTION.—Holotype incomplete with 86 setigers;
length 58 mm; maximal width 2.5 mm; length through setiger
10, 7 mm. Body cylindrical; only slightly dorsoventrally
flattened posteriorly.
Prostomium (Figure 80g) distinctly shorter and narrower
than peristomium, less than x /i as deep as peristomium.
Prostomial lobes frontally rounded, dorsally inflated; median
sulcus deep. Eyes at bases of A-II, reddish. Antennae in a
horseshoe, with A-I isolated by a gap, similar in thickness.
Ceratophores ring-shaped in all antennae, without articulations.
Ceratostyles slender and tapering; A-II and A-III with
cylindrical articulations; A-I with distally drop-shaped and