A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 157
Limbate and pectinate setae unknown. Shafts of compound
falcigcrs distally inflated, without marginal serrations, with
internal striations. Appendages tapering, bidentate. Proximal
teeth larger than distal teeth, tapering, directed laterally. Distal
teeth tapering, curved, distally directed obliquely laterally.
Guards of compound falcigers distally symmetrically rounded,
marginally smooth; mucros absent. Pseudocompound falcigers
and compound spinigers absent. Up to 3 aciculae in anterior
setigers, single in median setigers (setiger 40), dark, pointed,
bent in anterior setigers. Subacicular hooks with dark core and
clear sheath, bidentate. Distribution unknown, single. Proximal
teeth larger than distal teeth, directed laterally, tilted upward
distally. Distal teeth short, thick, tapering, directed distally.
UNKNOWN MORPHOLOGICAL FEATURES.—Most features
remain unknown.
EXPECTED STATES OF SELECTED UNKNOWN FEATURES.—
Species too poorly known to allow any predictions.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 34, 56. Unknown
Characters: 1, 2, 4-8, 10-12, 14-16; 18, 19, 24-26, 28, 29,
36-38,40,45-52, 57-60,63, 65-68,80.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Described from St. Thomas in the West Indies,
this species was compared to E. filamentosa by Mclntosh. It
has not been reported since it was first recorded. It belongs to
group B-4 and has been compared to similar species in Tables
33 and 34. The only other species in Table 34 with distally
drop-shaped articulations in the antennae is E. collaris. The two
species differ in many characters; perhaps most noticeable are
the differences in the branchial structures. Eunice goodsiri has
palmate branchiae with up to two filaments; E. collaris has
pectinate branchiae with up to 12 filaments.
Eunice goodsiri is too poorly known to be included in the
key.
76. Eunice gracilicirrata (Treadwell, 1922)
FIGURE 51a-g; TABLES 22,23
Ltodice gracilicirrata Treadwell, 1922:149-150, figs. 36-38, pi. 5: figs. 1-8.
Eunice arndllata.—Hartman, 1956:282 [not Eunice armillata Treadwell,
1922].
MATERIAL EXAMINED.—Holotype, AMNH IV-1920-1535,
Suva Harbor, Fiji.
COMMENTS ON MATERIAL EXAMINED.—The antennae are
all bent over and cannot be illustrated as stretched without
damage to the specimen; the sizes of the antennae given below
are low estimates.
DESCRIPTION.—Holotype complete, of unknown sex, with
323 setigers; length 214 mm; maximal width 2.5 mm at setiger
10; length through setiger 10,9 mm.
Prostomium (Figure 51a) distinctly shorter and narrower
than peristomium, as deep as x /i of the peristomium. Prostomial
lobes firontally rounded, dorsally inflated; median sulcus deep.
Antennae in shallow horseshoe; A-I and A-II close together,
separated by gap from A-I II; A-I 11 slimmer than A-I and A-II.
Ceratophores ring-shaped in all antennae, without articulations.
Ceratostyles tapering, slender, with up to 5 indistinct, long,
cylindrical articulations; articulations limited to distal half of
styles. A-I to middle of anterior peristomial ring; A-II to setiger
2; A-I 11 to front edge of setiger 4. Peristomium about twice as
long as prostomium, cylindrical. Separation between rings
distinct dorsally and ventrally and less well marked, but visible
also laterally; anterior ring ~ 4 /s of total peristomial length.
Peristomial cirri to tip of prostomium, slender, with 3 or 4
indistinct articulations.
Jaws not examined.
Branchiae (Figure 510 present, pectinate, distinctly longer
than notopodial cirri, not reduced in mid-body region, erect.
Branchiae from setiger 3 to setiger 181. Branchiae terminating
well before posterior end, present on less than 55% of total
number of setigers. First 2 pairs single filaments; maximum 7
filaments in setiger 20-60, thereafter numbers decreasing
gradually. From setiger 145 to setiger 181 only single filaments
present. Branchial stems slender, tapering, shorter than notopodial
cirri. Filaments very long, slender, digitiform. Last few
branchiae short, nearly button-shaped protrusions.
Neuropodial acicular lobes distally truncate; aciculae emerging
at midline. Presetal lobes low, transverse folds. Anterior
postsetal lobes about as long as acicular lobes, rounded,
becoming reduced to low, transverse folds by setiger 20.
Ventral cirri digitiform through setiger 10, thereafter basally
inflated through next 40 setigers, retaining long, digitiform
narrow tips. Inflated bases ovate, decreasing rapidly from
setiger 60, essentially lost by setiger 70. Posterior to setiger
100, ventral cirri tapering and digitiform. Anterior notopodial
cirri slender and tapering, similar in length to anterior ventral
cirri. Notopodial cirri increasing rapidly in length, by setiger 10
longer than half of body width, with 2 to 5 indistinct
articulations. Median and posterior notopodial cirri without
articulations. Notopodial cirri long in all branchial segments,
thereafter decreasing rapidly to about setiger 240. Posterior to
setiger 240 ventral cirri and notopodial cirri again of about
same length (Figure 51g); far posterior notopodial cirri less
than half as wide as ventral cirri.
Limbate setae slender, marginally serrated. Pectinate setae
(Figure 5 le) large, tapering, flat. Either 1 or both marginal teeth
longer than other teeth, with -12 teeth. Shafts of compound
falcigers (Figure 51c) inflated, with fine marginal serrations.
Appendages slender, bidentate. Proximal teeth smaller than
distal teeth, triangular, directed laterally. Distal teeth tapering,
curved. Guards symmetrically rounded, marginally finely
serrated; mucros absent. Pseudocompound falcigers and compound
spinigers absent. Aciculae paired, yellow, straight;
cross-sections round. Superior aciculae (Figure 51b) tapering
abruptly, distally covered with a fine hood or mucro. Inferior
aciculae bluntly rounded. Separation between core and sheath