A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 69
REMARKS.—Eunice armillata was compared to E.
mindanavensis by Hartman (1956:282). It is listed with species
from group A-2 (Fauchald, 1970) in Table 23, rather than with
species in group B-2, to which E. mindanavensis belongs,
because both subacicular hooks and aciculae are clear yellow,
rather than brown or black. In addition to this species, £.
leptocirris, E. schizobranchia, and E. stigmatura have branchiae
continued to near the posterior end; the other species in
Table 23 have the branchiae terminating posterior to setiger
100, but well before the posterior end. The ceratostyles of E.
leptocirris and E. schizobranchia lack articulations; the other
two species have articulated ceratostyles. Eunice stigmatura
has both bi- and tridentate subacicular hooks, and resembles
species listed in Table 46 more closely than the species in Table
22. Eunice armillata has only bidentate subacicular hooks and
is furthermore characterized by a low number of branchial
filaments compared to most other species in the group.
19. Eunice articulate Ehlers, 1887
FlOURE 16a-e; TABLES 19, 20
Eunice articulala Ehlers, 1887:83, pi. 24: figs. 8-10.
MATERIAL EXAMINED.—Two syntypes, MCZ 140 and 799,
Blake, 3 Apr 1869, off French Reef, Cast No. 1, 15 fathoms.
COMMENTS ON MATERIAL EXAMINED.—The two syntypes
do not belong to the same taxon; the specimen from MCZ 140
belongs to group B, probably to subgroup 2, the one from MCZ
799 to group A-1. The species has been considered related to E.
websteri (= E. longicirrata Webster) and Ehlers description
matches the specimen from MCZ 799; thus the following
description is based on this specimen. The specimen from MCZ
140 is briefly characterized at the end of this description. The
syntype from MCZ 799 previously has been dry.
DESCRIPTION.—Syntype incomplete, of unknown sex, with
132 setigers; length about 50 mm; width more than 3 mm;
length through setiger 10 not determined. Body cylindrical,
dorsoventrally flattened medially.
Prostomium (Figure 16a) distinctly shorter than and narrower
than peristomium, less than V2 as deep as peristomium,
bent dorsally. Prostomial lobes frontally truncate, dorsally
inflated; median sulcus deep. Eyes lateral to bases of A-I.
Antennae in transverse row, evenly spaced; A-I 11 distinctly
heavier than other antennae. Ceratophores ring-shaped in all
antennae, without articulations. Ceratostyles slender and
tapering; articulations cylindrical, becoming increasingly dropshaped
distally; maximum 17 articulations in A-III. A-I to
setiger 5; A-II to setiger 7; A-III to setiger 11. Peristomium
cylindrical. Separation between rings distinct only dorsally;
anterior ring 3 A of total pcristomial length. Peristomial cirri
reaching well beyond prostomium, about as long as A-I,
extremely slender, nearly filiform, with 6 very long articulations.
Maxillary formula 1+1, 5+6, 5+0, 4+7, and 1+1.
Branchiae (Figure 16e) present, pectinate, distinctly longer
than notopodial cirri, not reduced in mid-body region, erect.
Branchiae from setiger 4 through setiger 55. Branchiae
terminating well before posterior end, present on less than 55%
of total number of setigers. First and last 2 or 3 pairs single
filaments; maximum 6 filaments at about setiger 15. Branchiae
and filaments shorter than notopodial cirri in anterior branchial
region; both longer than notopodial cirri in posterior branchial
setigers. Stems thick, tapering, longer than filaments. Filaments
digitiform, slender in anterior setigers.
Shape of neuropodia indeterminable. Median ventral cirri
basally inflated; postbranchial ventral cirri slender, digitiform.
Anterior notopodial cirri long, slender, nearly filiform, with 3
cylindrical articulations, much longer than branchiae. Median
and postbranchial notopodial cirri short, tapering, without
articulations.
Limbate setae straight, narrowly limbate. Pectinate setae
numerous. Shafts of pectinate setae (Figure 16d) cylindrical,
slender. Blades tapering, flat. One marginal tooth longer than
other teeth; 15 teeth present. Shafts of compound falcigers
(Figure 16c) tapering, marginally smooth, without internal
striations or distal beak. Appendages large, with parallel sides;
basal boss distinct; head large, bidentate. Proximal teeth
triangular, directed laterally. Distal teeth larger than proximal
teeth, thick, directed obliquely distally. Guards symmetrically
bluntly pointed, marginally serrated, without mucros. Pseudocompound
falciger and compound spinigers absent. Aciculae
yellow, 2-3 in a parapodium, distally pointed, straight;
cross-section round. Separation of core and sheath indistinct in
both aciculae and subacicular hooks. Subacicular hooks (Figure
16b) yellow, bidentate. Hooks first present from setiger 40,
present in all setigers thereafter, always single (except for
replacements). Hooks tapering smoothly to tips; heads small.
Proximal teeth larger than distal teeth, directed laterally. Distal
teeth tapering, directed obliquely distally.
Syntype from MCZ 140 frontally deeply dissected, with 80
setigers; length 55 mm. Maxillary formula 1+1,4+4, 6+0,4+7,
and 1+1. Branchiae from setiger 5 to end; all branchiae
pectinate with erect stems. Shafts of pectinate setae slender,
cylindrical; blades distinctly flaring, flat. One marginal tooth
longer and thicker than the other teeth; -25 teeth. Aciculae
paired, black, distally bent. Subacicular hooks from setiger 32,
black, bidentate.
UKNOWN MORPHOLOGICAL FEATURES.—Characters associated
with posterior end; relationship between Mx III and left
Mx IV; neuropodial structures.
EXPECTED STATE OF SELECTED UNKNOWN FEATURES.—Mx
III long, straight, located behind left Mx II; distal arc absent;
Mx VI absent.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 56, 58, 59. Unknown
Characters: 1,2,4-6,43-49, 51, 52, 54, 55.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.