A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 255
directed laterally, tapering, thick. Hoods symmetrically
rounded; mucros and marginal serrations absent. Aciculae
single, yellow, tapering to blunt tips, anteriorly straight with
narrow hood, posteriorly gently curved, without hoods.
Subacicular hooks from setiger 24, single, yellow, tridentate.
Hooks with distinct bent neck; heads large. Fangs decreasing
evenly in size, evenly spaced. Proximal fangs triangular,
parrot-beaked. Secondary fangs slender, nearly straight Tertiary
fangs triangular, tapering, straight.
UNKNOWN MORPHOLOGICAL FEATURES.—Anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 56, 58, 59. Unknown
Characters: 65,66.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—A note in Augener's handwriting in the vial
with the holotype refers this specimen to Eunice rubra as a
juvenile. The species by definition belongs to group C-l and is
compared to similar taxa in Tables 41 and 44; it is the only
species in Table 44 to have hooded tapering aciculae. The setae
resemble those of species in group C-2 as well.
147. Eunice parvibranchis Grube, 1870
FIGURE 84j-m; TABLES 33, 39
Eunice parvibranchis Grube, 1870b:55.
MATERIAL EXAMINED.—TWO syntypes, ZMH V-804,
Upolu, Fiji Islands; ZMB Q 2266, Fiji Islands, coll. Godeffroy.
COMMENTS ON MATERIAL EXAMINED.—Both syntypes are
incomplete and are now very soft. A posterior fragment present
in same vial as the Hamburg syntype appears to belong to a
species of Palola in that it lacks subacicular hooks and
pectinate setae. At one time, the Berlin syntype has been dry
and is now difficult to measure in detail. The description is
based on the Hamburg specimen, with notes on the Berlin
specimen where it differs. As indicated the specimens are very
soft, and so the structure, especially of the parapodia, cannot be
determined very accurately.
DESCRIPTION.—Hamburg syntype incomplete with 133
setigers; length 144 mm; maximal width 4 mm; length through
setiger 10, 10 mm. Berlin syntype incomplete with -145
setigers; length about 65 mm.
Prostomium (Figure 841) distinctly shorter and narrower than
peristomium, less than x /i as deep as peristomium. Prostomial
lobes frontally rounded, dorsally inflated; median sulcus
shallow. Eyes posterior to bases of A-I, faded. Antennae in a
semicircle with A-I well in front of other antennae, evenly
spaced, similar in thickness. Ceratophores ring-shaped in all
antennae, without articulations. Ceratostyles thick and digitiform;
none outreaching peristomium; A-III longest. Peristomium
cylindrical, with distinct muscular lower lip. Separation
between rings distinct on all sides; anterior ring 4 /s of total
peristomial length. Peristomial cirri to middle of anterior
peristomial ring, digitiform, without articulations.
Jaws on left hand side all missing in Hamburg syntype;
lining of oral cavity intact; left-hand jaws possibly shed or
never developed. Formula for right hand side 1, 6, 10, and 2
(Mx III missing). Maxillary formula of Berlin syntype 1+1,
5+5, 7+0, 2+9, 1+1. Mx III and left Mx IV part of distal arc.
Branchiae present, palmate, distinctly longer than notopodial
cirri, not reduced in mid-body region. Branchiae from setiger
20 to end of fragment (from setiger 19 in Berlin syntype), most
branchiae with 2 filaments. Where best developed, around
setiger 40, 3 filaments present. Filaments longer than notopodial
cirri except in first 3-4 branchial segments, slender and
digitiform.
Neuropodial acicular lobes probably rounded or truncate. All
presetal lobes low, transverse folds. Anterior postsetal lobes
possibly as high as acicular lobes, becoming low, transverse
folds in median and posterior setigers. Anterior ventral cirri
tapering; basally inflated from about setiger 5-6 at least
through setiger 50. Inflated bases ovate; narrow tips tapering.
Posterior ventral cirri tapering. Notopodial cirri short and
medially inflated, without articulations.
Limbate setae slender, marginally smooth. Pectinate setae
(Figure 84j) distally flaring, slightly furled. Both marginal teeth
slightly longer than other teeth; -16 teeth present Shafts of
compound falcigers (Figure 84i) distinctly inflated, marginally
serrated. Appendages short and tapering, bidentate. Proximal
teeth about as large as distal teeth, narrowly triangular, directed
laterally. Distal teeth gently curved. Guards symmetrically
rounded, marginally serrated; mucros absent. Pseudocompound
falcigers and compound spinigers absent. Aciculae
brown, lighter in posterior than in anterior setigers, slightly
tapered, truncate, straight; cross-section round. Subacicular
hooks (Figure 84k) brown, bidentate. Hooks from setiger 19
(from setiger 17 in Berlin syntype), present in all setigers
thereafter, always single (except for replacements). Hooks
abruptly tapering distally. Proximal and distal teeth similar in
size. Proximal teeth thick, short. Distal teeth about one-half as
thick as proximal teeth.
UNKNOWN MORPHOLOGICAL FEATURES.—Relationship between
Mx III and left Mx IV; parapodial and setal characters of
far posterior setigers; pygidium and anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 22, 34, 56. Unknown
Characters: 1, 2, 4, 6, 36-40, 44,47, 50, 57-60, 63, 74, 78.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—37,1;
38,1.
REMARKS.—Eunice parvibranchis belongs to group B-4 and
closely resembles several other species in the group as
indicated in Tables 33 and 39. Most species listed in Table 39
have subacicular hooks starting about 10 segments later than