A Review of the Genus Eunice - Smithsonian Institution Libraries

84 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
with distinct distal beak. Appendages short, tapering with
distinct heads, bidentate. Proximal teeth curved, triangular,
directed laterally; distal teeth longer than proximal teeth,
tapering, curved, directed laterally. Guards asymmetrically
bluntly pointed, marginally smooth, without mucros. Pscudocompound
falcigers and compound spinigers absent. Aciculae
(Figure 21k) paired, black, blunt, gently curved in most
setigers; cross-section round. Subacicular hooks (Figure 21m)
black, bidentate. Hooks first present from setiger 27, present in
all setigers thereafter, always single (except for replacements).
Hooks with large heads and narrow necks. Proximal teeth
slender, tapering, directed obliquely distally; distal teeth
shorter than proximal teeth, but distinctly thicker, directed
obliquely laterally.
UKNOWN MORPHOLOGICAL FEATURES.—Pygidium and anal
cirri; relation between Mx III and left Mx IV.
EXPECTED STATE OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—Mx III part of distal arc with left MX IV; short,
curved. Left Mx IV distinctly shorter than right Mx IV, curved.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 56, 58, 59. Unknown
Characters: 13, 14, 74, 78.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—The specimen is very well preserved; it is a
nearly mature male with sperm discs in the coelom.
Eunice biformicirrata is listed with similar species in Tables
27 and 32. In addition to E. biformicirrata, two species in Table
32, E. laurillardi and E. longicirris, have the notopodial cirri
articulated throughout the body; the other species either lack
such articulations altogether or the notopodial cirri are
articulated only in the anterior, usually pre-branchial and early
branchial setigers. In E. biformicirrata, the peristomial cirri
reach the middle of the peristomium; in both the other species
the peristomial cirri are longer, reaching at least the middle of
the prostomium.
29. Eunice bilobata Treadwell, 1906
FIGURE 22; TABLES 27, 29
Eunice bilobata Treadwell, 1906:1168-1169, figs.47, 48.
MATERIAL EXAMINED.—Holotype, USNM 5212, Albatross
sta 3871, Auau Channel, between Maui and Lanai islands,
20°52'20"N, 156°41'35"W, 24-79 m, fine white sand, 12 Apr
1902.
COMMENTS ON MATERIAL EXAMINED.—The holotype consists
of a well-preserved anterior end and three median
fragments, which probably all derive from the same specimen;
size and general constitution are similar, but several intermediate
sections must be missing, because the fragments do not
match well. The description is based on the anterior end only.
DESCRIPTION.—Anterior fragment with 35 setigers; length
18 mm; maximal width 6 mm; length through setiger 10,7 mm.
Head and anterior 5-6 segments cylindrical; remainder of
fragment dorsoventrally flattened.
Prostomium (Figure 22a) distinctly shorter and narrower
than peristomium, as deep as l /i of the peristomium, nearly
hidden under large antennae. Prostomial lobes frontally
obliquely truncate, dorsally flattened; median sulcus deep.
Eyes absent. Ceratophores ring-shaped in all antennae, without
articulations. Ceratostylcs digitiform, with up to 12 irregular,
indistinct cylindrical articulations in A-II. A-I to posterior
margin of peristomium; A-II reach setiger 7; A-III incomplete;
at least as long as A-II. Peristomium strongly flaring anteriorly;
with distinct, muscular lower lip. Separation between rings
distinct dorsally, possibly also ventrally, but distorted by
overlapping fold; anterior ring 9 /io of total peristomial length.
Peristomial cirri to middle of prostomium, digitiform, without
articulations.
Maxillary formula 1+1, 5+6, 6+0, 3+9, and 1+1.
Branchiae (Figure 22e) present, pectinate, distinctly shorter
than notopodial cirri, not reduced in mid-body region, flexible.
Branchiae from setiger 7, present on all fragments. All
branchiae pectinate with up to 18 filaments. Branchial stems
curved dorsally and twisted posteriorly in most segments.
Filaments short, slender.
Neuropodial acicular lobes broadly rounded; aciculae
emerging dorsal to midline. Pre- and postsetal lobes low,
transverse folds. First 3 ventral cirri thick, tapering, becoming
basally inflated from setiger 4. Inflated bases thick, ovate;
narrow tips tapering. Anterior notopodial cirri long, basally
inflated, tapering to thick, digitiform tips; in branchial region
notopodial cirri shorter, tapering from bases. Notopodial cirri
with up to 7 articulations anteriorly; number of articulations
decreasing posteriorly; median and posterior notopodial cirri
with 3 or 4 articulations.
Limbate setae long, narrow. Pectinate setae (Figure 22c)
large, tapering, flat. Marginal teeth no longer than other teeth,
about 10 long, distally tapering teeth present. Shafts of
pectinate setae distinctly punctate. Shafts of compound
falcigers (Figure 22b) tapering. Appendages short, bidentate.
Both teeth similar in size. Proximal teeth directed laterally.
Distal teeth directed obliquely distally. Guards symmetrically
rounded, without mucros. Pseudocompound falcigers and
compound spinigers absent. Aciculae paired, dark, superior
aciculae bent with irregular knobs (Figure 22d); other aciculae
tapering to straight, blunt points; cross-section of aciculae
round. Subacicular hooks black, bidentate. Hooks first present
from setiger 25, present in all setigers thereafter, always single
(except for replacements).
UNKNOWN MORPHOLOGICAL FEATURES.—Relation between
Mx III and left Mx IV; features associated with posterior
setigers; pygidium and anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—Branchiae continued to the far posterior end.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 14, 56. Unknown