A Review of the Genus Eunice - Smithsonian Institution Libraries

130 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—Mx III short, forming part of distal arc with left Mx
IV.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 56, 60. Unknown
Characters: 1,2,4, 6, 33, 36-40, 51, 58, 59, 74, 78, 81, 82.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—33,2;
37,1; 38,1.
REMARKS.—Eunice eimeorum differs clearly from E. pacifica
in the distribution of branchiae, which are present from
setiger 5 in E. eimeorum and from setiger 17-21 in E. pacifica.
Clear amber subacicular hooks are present from setiger 38 in E.
eimeorum and dark brown, nearly black subacicular hooks
present from setigers 23-28 in E. pacifica. The specimens of
the two species are similar in size.
Eunice eimeorum is listed with similar species in Tables 27
and 31. The appendage of compound hooks resembles the
compound hooks of E. pelamidis.
58. Eunice elegans (Verrill, 1900)
FIGURE 41a-k; TABLES 24,25
Leodice elegans Verrill, 1900:640-641.
Leodice longicirrata.—Treadwell, 1921:11-14, figs. 3-12, pi. 1: figs. 1-4
[not Eunice longicirrata Webster, 1884].
Eunice longicirrata.—Hartman, 1942:9 [not Eunice longicirrata Webster,
1884].
MATERIAL EXAMINED.—Holotype, YPM 2730, Bermuda,
low [shallow] water, Apr 1898, coll. A.E. Verrill and party.
DESCRIPTION.—Holotype complete, of unknown sex, with
133 setigers; total length 75 mm; maximal width 3 mm at
setiger 10; length through setiger 10, 8 mm. Body cylindrical
anteriorly, becoming ventrally flattened posteriorly.
Prostomium (Figure 41b) distinctly shorter and narrower
than peristomium, as deep as l li of peristomium. Prostomial
lobes frontally obliquely truncate, flattened dorsally and
ventrally; median sulcus very shallow. Eyes between bases of
A-I an A-II. Antennae in a horseshoe, evenly spaced.
Ceratophores long in all antennae, without articulations. Only
left A-II present (Figure 41a), now detached, digitiform, with 9
short, but distinctly cylindrical articulations, to setiger 2.
Peristomium cylindrical, about twice as long as prostomium.
Separation between rings distinct on all sides, but especially
well marked dorsally and ventrally; anterior ring 3 /4 of total
peristomial length. Peristomial cirri to middle of prostomium,
tapering, with 4 indistinct articulations.
Jaws not examined.
Branchiae (Figure 41c) present, pectinate, distinctly longer
than notopodial cirri, not reduced in mid-body region, erect.
Branchiae from setiger 3 through setiger 33. Branchiae
terminating well before posterior end, present on less than 55%
of total number of setigers. First and last branchiae single
filaments; maximum 10 filaments at setiger 10-15. Branchiae
covering dorsum where best developed. Stems slender, erect.
Filaments trim, slender, shorter than notopodial cirri.
Anterior neuropodial acicular lobes rounded, becoming
increasingly conical posteriorly (Figure 4Id); aciculae emerging
above midline. Pre- and postsetal lobes low, transverse
folds. First 4 ventral cirri tapering. Ventral cirri basally inflated
from setiger 5 through about setiger 50. Inflated bases ovate;
narrow tips tapering. Posterior ventral cirri broadly attached,
tapering to blunt tips, forming very shallow, open scoops
around ventral margin of neuropodia. Notopodial cirri supported
by aciculae; anterior notopodial cirri basally inflated and
indistinctly separated into 4 articulations. Articulations lost in
first few setigers of branchial region; notopodial cirri becoming
slender and tapering from first postbranchial setigcrs, retaining
that shape to the end.
Limbate setae slender, marginally finely serrated. Pectinate
setae (Figure 41c,j) tapering, flat. One marginal tooth longer
than other teeth, about, 10 teeth present; anterior pectinate setae
somewhat asymmetrical, becoming symmetrical in postbranchial
region. Shafts of anterior compound falcigers (Figure
41k) tapering, becoming gently inflated (Figure 410 in
postbranchial setigcrs, marginally smooth; beaks indistinct.
Anterior appendages tapering; heads indistinct, bidentatc.
Proximal teeth very much shorter than distal teeth, triangular.
Distal teeth tapering, nearly erect. Guards asymmetrically
bluntly pointed. Postbranchial appendages short, with large
heads. Proximal teeth and distal teeth similar in size; proximal
teeth tapering, directed basally. Distal teeth smoothly curved.
Guards symmetrically rounded; all guards marginally smooth;
mucros absent. Pseudocompound falcigers and compound
spinigers absenL Neuropodial aciculae paired, dark yellow to
amber-colored; anterior aciculae (Figure 41 i) distally expanded
into rounded knobs; postbranchial aciculae (Figure 41h)
sharply tapered; superior aciculae gently curved dorsally;
cross-section round. Separation between core and sheath
indistinct in both aciculae and subacicular hooks. Subacicular
hooks (Figure 41g) amber-colored, bidentate. Hooks first
present from setiger 30, present in all setigers thereafter,
usually 2-3 hooks in a parapodium. Hooks with narrow necks
and distinct heads. Proximal teeth twice as large as the distal
teeth, triangular, directed laterally. Distal teeth tapering, erect.
Guards distally truncate.
UNKNOWN MORPHOLOGICAL FEATURES.—Jaw structure;
pygidium and anal cirri.
EXPECTED STATES OF SELECTED UNKNOWN FEATURES.—
Mx III long, located behind left Mx II.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 56, 60. Unknown
Characters: 17,23.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Eunice elegans resembles E. websteri (= E.
longicirrata Webster) but differs in the changing shape of the
aciculae and compound hooks in different parts of the body,
and also in the maximum number of branchial filaments and