A Review of the Genus Eunice - Smithsonian Institution Libraries

152 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
UNKNOWN MORPHOLOGICAL FEATURES.—Relationship between
Mx III and left Mx IV; all features associated with
anterior setigers, including branchial distribution; pygidium
and anal cirri.
EXPECTED STATES OF SELECTED UNKNOWN FEATURES.—
Mx III short and forming part of distal arc with left Mx IV.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 22, 58, 59. Unknown
Characters: 4, 6-12, 14-20, 24, 25, 39, 42, 51, 52, 54-56,
65,66, 80-82.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Eunice fucata was synonymized with E. schemacephala
by Augener (1925:28-29) after an examination of
the types of the latter. The latter is here considered to be
indeterminable. The two are here considered separable. Eunice
fucata is listed in Tables 27 and 28 and listed with other species
with simple spine-like subacicular hooks in Table 50. Of the
species listed in Table 28, E. sebastiani as well as this species
has these kinds of subacicular hooks. Eunice fucata has up to
12 branchial filaments; E. sebastiani has 40 filaments, and the
relative lengths of the antennae are very different in the two
species.
73. Eunice fuscafasciata (Treadwell, 1922)
FIGURE 49e-h; TABLES 33, 40
Nicidionfusca-fasciata Treadwell. 1922:156-157, figs. 47-50. pi. 7: fig. 5.
MATERIAL EXAMINED.—Syntype, AMNH 1920-1529, Pago
Pago, Samoa. Syntype, AMNH 1920-1537, Pago-Pago, Samoa.
COMMENTS ON MATERIAL EXAMINED.—The syntype from
1529 is labeled Nicidionflava-fasciata; the syntype from 1537
is labeled Nicidion fusca-fasciata. The latter is the specimen
illustrated by Treadwell (1922, pi. 7: fig. 5). The present
description and illustrations are based on the specimen from
1529.
DESCRIPTION.—Syntype described incomplete, of unknown
sex, with 84 setigers; length 33 mm; maximal width 1.3 mm at
setiger 10; length through setiger 10, 3 mm.
Prostomium (Figure 49e) distinctly shorter and narrower
than peristomium, as deep as 1 /2 of the peristomiurn. Prostomial
lobes frontally rounded, dorsally inflated; median sulcus deep.
Antennae large, in transverse row, evenly spaced, similar in
thickness. Ceratophores ring-shaped in all antennae, without
articulations. Ceratostyles medially inflated, with up to 8
cylindrical articulations in A-III; articulations distinct on distal
half of ceratostyles only. A-I to middle of anterior peristomial
ring; A-I I to anterior edge of posterior peristomial ring; A-III to
posterior edge of peristomium. Peristomium cylindrical with
distinctly muscular lower lip. Separation between rings barely
visible dorsally, invisible elsewhere; anterior ring 4 /5 of total
peristomial length. Peristomial cirri short, slender and digitiform,
without articulations.
Maxillary formula 1+1, 5+6, 6+0, 4+9, and presumably 1+1
according to information in Treadwell (1922).
Branchiae absent.
Neuropodial acicular lobes distally truncate; aciculae emerging
at midline. Pre- and postsetal lobes low, transverse folds.
Anterior ventral cirri thick and tapering. Ventral cirri basally
inflated in median setigers. Inflated bases ovate; narrow tips
tapering. Posterior ventral cirri slender. Anterior notopodial
cirri thick, tapering, becoming distinctly medially inflated in
posterior setigers, without articulations.
Pectinate setae (Figure 490 slightly flaring, flat. One
marginal tooth distinctly longer than the teeth, with -10 teeth.
Shafts of compound falcigcrs (Figure 49g) distally inflated,
marginally smooth. Appendages short with distinct head,
bidentate. Proximal teeth larger than distal teeth, pointed,
tapering, directed basally. Distal teeth slender, curved. Guards
distally symmetrically rounded; mucros absent. Pseudocompound
falcigcrs and compound spinigers absent. Aciculae with
black cores and clear sheaths, tapering distally to blunt, straight
tips; cross-section round. Subacicular hooks (Figure 49h) with
black cores and clear sheaths, bidentate. Hooks first present
from setiger 23, present in all setigers thereafter, always single
(except for replacements). Hooks with distinctly bent, narrowed
necks, distinct heads. Both teeth directed obliquely
distally; proximal teeth larger than distal teeth.
UNKNOWN MORPHOLOGICAL FEATURES.—Relationship between
Mx III and left Mx IV; setal characters associated with
far posterior setigers; pygidium and anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—Mx III short and forming part of distal arc with left
Mx IV.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 31-42, 56, 58, 59.
Unknown Characters: 1, 2, 13, 14,47, 50, 63.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—The structure of the subacicular hooks of £.
fuscafasciata resembles those in E. afra and the species is
compared to other species in group B-4 in Table 33 and with
other abranchiate species in Table 40. Only two abranchiate
species have articulated ceratostyles; of these, E. fuscafasciata
has cylindrical articulations and E. curticirris has distinctly
moniliform articulations. The differences between this species
and E. brevis was discussed above.
Eunice fusicirris Grube, 1878
Eunice fusicirris Grube, 1878a:102-103.
REMARKS.—Grube described E. fusicirris as having short,
thick antennae and peristomial cirri without articulations. The
notopodial cirri were thick and stumpy in anterior setigers,
becoming more slender in posterior setigers. Branchiae were
present from setiger 5 to setiger 37 (of 50 setigers in the