A Review of the Genus Eunice - Smithsonian Institution Libraries

228
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
absent. Aciculae yellow, slender, tapering, straight; crosssections
round. Separation between core and sheath indistinct
in both aciculae and subacicular hooks. Subacicular hooks
(Figure 75g) yellow, tridentate with teeth in crest. Hooks first
present from setiger 27, present in all setigers thereafter, always
single (except for replacements). Hooks with large curved main
fang; 2 distal fangs emerging from common base; tertiary fangs
very much smaller than secondary fangs.
UNKNOWN MORPHOLOGICAL FEATURES.—None.
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 multicylindri was described from rather
well-preserved material and enough specimens to allow
statistical treatment of material along the same lines presented
by Fauchald (in press). Variability in material is indicated in
Table 10.
Eunice multicylindri is listed with similar species in Tables
41 and 42. It is characterized more by a combination of
character states than by a single unique one. It is discussed in
the section on E. medicina.
127. Eunice multipectinata Moore, 1911
FIGURE 76a-i; TABLES 27, 32
Eunice nudtipectinata Moore, 1911:248-251, pi. 15: figs. 20-23.
MATERIAL EXAMINED.—Holotype, USNM 16919, Albatross
sta 4377, Southern California, 10.2 miles southwest of
Point Loma (~32°35'N, 117°25'W), 17 Mar 1904, 232-547 m,
green mud and sand, dredge; USNM 16880, Albatross sta
4431,2 specimens, Southern California, 3.5 to 5.2 miles NE of
Brockway Point, Santa Rosa Island (approximately 34°06 / N,
120°04'W), 15 Apr 1904, 69-82 m, green and yellow mud,
rock and sand, various dredges.
COMMENTS ON MATERIAL EXAMINED.—The holotype was
at one time desiccated by exposure to highly concentrated
alcohol and is now partially distorted; the two other specimens
examined are part of the original material, but were not
designated as types by Moore.
DESCRIPTION.—Holotype complete with 196 setigers; total
length 172 mm; maximal width 7 mm; length through setiger
10,16 mm. Body cylindrical, tapering slowly posteriorly. Anal
cirri as long as last 12 setigers combined.
Prostomium (Figure 76d) distinctly shorter and narrower
than peristomium, less than 1 /i as deep as peristomium.
Prostomial lobes frontally rounded, dorsally excavate with a
thickened rim; median sulcus shallow, but distinct. Eyes
between bases of A-I and A-II, dark. Antennae evenly spaced,
similar in thickness. Ceratophores ring-shaped in all antennae,
without articulations. Ceratostyles tapering, with cylindrical
articulations except drop-shaped distalmost articulations in
A-I. A-I to posterior peristomial ring; A-II to setiger 1; A-III
incomplete in all specimens, apparently at least as long as A-II.
Peristomium cylindrical; front edge of lower lip coarsely
scalloped, muscular. Separation between rings distinct dorsally
and ventrally; anterior ring about 5 A of total peristomial length.
Peristomial cirri to front of anterior peristomial ring; in 1
specimen to posterior end of prostomium, slender and
digitiform, with 5 to 6 articulations.
Maxillary formula of specimen from USNM 16880 1+1,
8+8, 9+0, 7+11, 1+1, and 1+1. Mx VI small with barely
projecting point. Mx III short; part of distal arc with left Mx IV.
Branchiae (Figure 76a,e) present, pectinate, distinctly longer
than notopodial cirri, not reduced in mid-body region, erect.
Branchiae from setiger 7-8 to sctiger 1%. Branchiae present to
near posterior end, present on more than 65% of total number
of setigers. Single filaments in first 8-10 branchiated setigcrs;
up to 12 slender filaments in trim scries at sctigcrs 15-20.
Branchial stems slender. Filaments shorter than notopodial cirri
in all setigers. Branchiae shorter than notopodial cirri except in
setigers 15-30.
All neuropodial acicular lobes asymmetrically obliquely
rounded; aciculae emerging from upper edge of lobes. All
pre- and postsetal lobes low, transverse folds. First 4 ventral
cirri thick, digitiform, becoming basally inflated from about
setiger 5. Inflated bases distinct, elevated ridges along lower
edge of neuropodia; narrow tips tapering. Inflated bases
reduced from about setiger 65, remaining visible in all but last
50-60 setigers. Far posterior ventral cirri very long, slender,
digitiform, about twice as long as neuropodial acicular lobes.
All notopodial cirri slender, tapering, slightly inflated basally.
Anterior notopodial cirri with up to 7 indistinct articulations;
articulations lost by setiger 15.
Limbate setae marginally serrated. Pectinate setae (Figure
76c,i) tapering, flat or slightly furled. One marginal tooth very
much longer than all other teeth; 10-15 teeth present. Shafts of
compound falcigers tapering, marginally finely serrated in
anterior setigers (Figure 76b), marginally smooth in posterior
setigers (Figure 76g). Anterior appendages tapering, bidentate.
Proximal teeth larger than distal teeth, curved, laterally
directed. Distal teeth distinctly curved. Median and posterior
appendages less tapering. Proximal teeth triangular, directed
laterally, straight. Distal teeth similar to those in anterior
appendages. Guards bluntly to sharply symmetrically pointed,
marginally sometimes frayed; mucros absent. Pseudocompound
falcigers and compound spinigers absent. Aciculae
(Figure 76f) paired in all but few posterior setigers, with dark
brown to black cores and clear sheaths, tapering, distinctly
bent. Curvature of aciculae at right angles to each other in some
parapodia; cross-sections round. Subacicular hooks (Figure
76h) with dark brown to black cores and clear sheaths,
bidentate. Hooks first present from setigers 37 and 39 in 2