A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 83
in 120-150 m depth. The specimen was not available; the
description below is summarized from the original description.
DESCRIPTION.—Holotype (and only specimen) incomplete,
with 50 setigers; total length 12 mm; maximal width 1 mm.
Ceratostyles slender and digitiform, articulated, especially
distally, with long, cylindrical articulations, becoming apparently
drop-shaped distally. A-III to setiger 10. Two pairs of
peristomial cirri present; outer pair to posterior end of
prostomium; medial pair somewhat shorter.
Branchiae present, palmate. Branchiae from setiger 3
through setiger 48. Maximum number of filaments 2.
Limbate setae illustrated as marginally smooth. Pectinate
setae absent. Shafts of compound falcigers inflated. Appendages
small, linear, bidentate. Proximal teeth triangular, distal
teeth slender, curved. Guards illustrated as symmetrically
sharply pointed, but not mucronate. Pseudocompound falcigers
and compound spinigers absent. Aciculae yellow, tapering to
blunt tips and distally curved. Subacicular hooks yellow,
trideniate with teeth in a crest. Hooks first present from setiger
45. Two distal teeth emerging from common base.
UKNOWN MORPHOLOGICAL FEATURES.—Shape features
associated with pro- and peristomium; jaw structure (but see
comments below); all parapodial features; setal distribution and
shapes must be confirmed; pygidium and anal cirri.
EXPECTED STATES OF SELECTED UNKNOWN FEATURES.—
The species is too poorly known to make meaningful
predictions.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: None known. Unknown
Characters: 1, 2, 4-19, 24-26, 28, 29, 32-34,
37-68,74,75,78,81,82.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Rullier considered the peristomium as two
asetigerous segments; the distribution of branchiae and
subacicular hooks has been recalculated to the conventions
used in this paper; thus the numbers will not agree with those
originally stated.
The jaws appear to be highly unusual. Rullier specifically
stated that maxillae were absent and that the whole apparatus
consisted of two pairs of mandibles. The illustration, seen from
the ventral side, shows a pair of very slender forceps and a pair
of curved, medially excavated lateral pieces fused to a narrow
carrier in the midline posteriorly; the dorsal and distal ends of
each half are strongly denticulated with very small, even teeth.
These jaws resemble those of juvenile eunicids and onuphids.
The structure of the jaws as illustrated and the other features
specified indicate that Rullier had a juvenile specimen, perhaps
anteriorly damaged, suggested by the doubled peristomial cirri,
of group C-l orC-2.
Eunice bicirrata is here considered a juvenile, possibly
indeterminable. It is listed with similar species in Tables 41 and
42 and in Tables 46-48. It is too poorly known to be included
in the key. The description of a new species based on a juvenile
does not, per se, make the taxon invalid.
28. Eunice biformicirrata (Treadwell, 1922)
FIGURE 21g-m; TABLES 27,32
Leodice biformi-cirrata Treadwell. 1922:148-149, figs. 34, 35, pi. 4: figs.
6-11.
Eunice grubei Hartman, 1956:282 [not Eunice grubei Gravier, 1900].
MATERIAL EXAMINED.—Holotype, AMNH 1527, Suva, Fiji,
Apr 1920, coll. A.L. Treadwell.
DESCRIPTION.—Holotype complete male with 137 setigers;
total length 217 mm; maximum width 7 mm at setiger 15.
Length through setiger 10,17 mm; width at setiger 10,6.5 mm.
Anterior body cylindrical with strongly convex dorsum,
becoming ventrally flattened in median setigers and dorsoventrally
flattened in posterior setigers. Anterior end truncate,
tapering slowly posteriorly.
Prostomium (Figure 21g) distinctly shorter than and narrower
than peristomium, less than x ji as deep as peristomium.
Prostomial lobes frontally rounded, dorsally inflated; median
sulcus deep. Eyes not seen. Antennae in a horseshoe, evenly
spaced, similar in thickness. Ceratophores ring-shaped, without
articulations. Ceratostyles tapering; basal 73 without articulations;
styles increasingly articulated in median l /i and
articulations distinctly moniliform in distal x h of each antenna.
A-I to middle of peristomium; A-II and A-III to setiger 1;
maximally -10 articulations. Peristomium cylindrical. Separation
between rings distinct ventrally and at bases of peristomial
cirri; anterior ring 3 A of total peristomial length. Peristomial
cirri to middle of first peristomial ring, thick and tapering, with
about 7 short, moniliform articulations.
Jaws missing; according to Treadwell, maxillary formula
1+1,5+5, 6+0, +8, and 1+1.
Branchiae (Figure 21h,i) present, pectinate, distinctly longer
than notopodial cirri, not reduced in mid-body region, erect.
Branchiae from setiger 3 to setiger 132. Branchiae present to
near posterior end, present on more than 65% of total number
of setigers. First and last 5 branchiae single filaments;
maximum number of filaments 7 reached at setiger 10,
thereafter number of filaments decreasing slowly; by setiger
100 (Figure 21h) only 2 filaments left. Branchial stems thick,
tapering, shorter than filaments. Filaments digitiform.
Anterior neuropodial acicular lobes short, asymmetrically
truncate or rounded with aciculae emerging well above
midline; median and posterior acicular lobes broadly asymmetrically
truncate. All pre- and postsetal lobes low, continuous
folds. Anterior ventral cirri digitiform in 3 first setigers. Ventral
cirri strongly inflated from about setiger 4. Inflated bases
spherical; narrow tips digitiform. Inflation decreasing posterior
to setiger 60; far posterior ventral cirri digitiform. All
notopodia tapering with 2 or 3 cylindrical articulations.
Limbate setae longer than other setae, marginally serrated.
Pectinate setae (Figure 211) very small; shaft cylindrical,
narrow; blades flat, flared. One marginal tooth longer than
other teeth; -20 very fine teeth. Shafts of compound falcigers
(Figure 21j) tapering, internally striated, marginally smooth,