A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 237
visible ventrally; anterior ring 4 /s of total peristomial length.
Peristomial cirri to front edge of peristomium or somewhat
beyond, slender and tapering, with 2 long articulations.
Maxillary formula 1+1, 5+6, 6+0, 4+9, and 1+1. Mx III
forming part of distal arc with left Mx IV.
Branchiae (Figure 79e) present, pectinate, distinctly longer
than notopodial cirri, not reduced in mid-body region, erect.
Branchiae from setiger 6 to end of fragment. First 2 branchiae
single, short filaments; maximum 14 filaments present.
Branchial stems short, tapering. Filaments long, slender.
Neuropodial acicular lobes distally rounded or truncate;
aciculae emerging dorsal to midline. Pre- and postsetal lobes
low, transverse folds. First 5 ventral cirri thick, tapering.
Ventral cirri basally inflated in branchial region. Inflated bases
thick, transverse welts; narrow tips very long, distally truncate,
digitiform. Notopodial cirri very long, tapering from slightly
inflated bases, less dominant in posterior than in anterior
setigers. Notopodial cirri without articulations.
Pectinate setae (Figure 79b) coarse, tapering, flat. One
marginal tooth slightly longer than other teeth; -10 coarse teeth
present. Shafts of compound falcigers (Figure 79d) slightly
inflated, marginally smooth. Appendages slender, bidentate.
Both teeth directed laterally. Guards asymmetrically bluntly
pointed, with convexity covering proximal teeth; mucros
absent. Pseudocompound falcigers and compound spinigers
absent. Aciculae paired, black, tapering to bluntly conical tips,
straight; cross-sections round. Subacicular hooks (Figure 79c)
black, bidentate. Hooks first present from setiger 31, present in
all setigers thereafter, always single (except for replacements).
Hooks slender. Proximal teeth twice as large as distal teeth,
directed laterally.
UNKNOWN MORPHOLOGICAL FEATURES.—All features associated
with posterior parapodia; pygidium and anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 56. Unknown Characters:
4, 6, 13,14, 36-38; 40, 42,47, 50, 57-60, 63, 74, 78.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—37,1;
38,1.
REMARKS.—Eunice nesiotes is listed with similar species
Tables 27 and 31. The ventral cirri are basally inflated through
the posterior end in this species; however, the shape cannot be
determined accurately. Two other species listed in Table 31
have such distribution of the inflated bases. Eunice borneensis
has short peristomial cirri; E. guildingi and E. nesiotes have
peristomial cirri reaching the middle of the prostomium. The
peristomial cirri lack articulations in E. guildingi; they have
two long articulations in E. nesiotes.
134. Eunice nicidioformis Treadwell, 1906
FIGURE 79f-m; TABLES 11,24,25
Eunice nicidiaformis Treadwell, 1906:1169, figs. 49-51.
MATERIAL EXAMINED.—Lectotype, USNM 5213, and 5
paralectotypes, USNM 142035, Albatross sta 4098, Hawaiian
Islands, 6.5 miles off Puniawa (= Pauwela) Point, Maui
(~21°O1X 156°12'W), 23 Jul 1902, 174-278 m, fine coral
sand and foraminifera, beamtrawl. Four paralectotypes, USNM
5419, Albatross sta 4077, Hawaiian Islands, 6.1 miles off
Puniawa (= Pauwela) Point, Maui (-H'Vl'N, 156°15'W), 21
Jul 1902, 181-194 m, fine coral sand and foraminifera,
beamtrawl.
DESCRIPTION.—Holotype complete female with large eggs
in body cavity with 97 setigers; total length 45 mm; maximal
width 2 mm; length through setiger 10, 6 mm. Body slender,
cylindrical with long, slender antennae and long, tapering anal
cirri. Anal cirri as long as last 15 setigers combined.
Prostomium (Figure 79i) distinctly shorter and narrower than
peristomium, less than 1 /2 as deep as peristomium. Prostomial
lobes frontally rounded, dorsally excavate with a thickened
rim; median sulcus deep. Eyes near bases of A-II, dark.
Antennae in a horseshoe, with A-I isolated by a gap, similar in
thickness. Ceratophores ring-shaped in all antennae, without
articulations. Ceratostyles tapering, with up to 10 distinct
articulations; articulations cylindrical, drop-shaped distally in
A-I. A-I to setiger 1; A-II to setiger 7; A-II I to setiger 13.
Antennae of paratypes generally shorter, but A-I always
outreaching peristomium and A-III longer than all other
antennae in all specimens. Peristomium slightly flaring
anteriorly, lower lip scalloped, muscular. Separation between
rings distinct dorsally and ventrally; anterior ring ~ 5 /6 of total
peristomial length. Peristomial cirri to middle of prostomium,
slender and tapering, with 9 articulations.
Maxillary formula of a paratype from USNM 5213 1+1,7+7,
8+0, 6+12, and 1+1. Teeth small, slender. Mx III part of distal
arc with left Mx IV.
Branchiae (Figure 79f) present, single filaments, distinctly
shorter than notopodial cirri. Branchiae from setiger 6-8 to
setigers 40-50. Branchiae terminating well before posterior
end, present on less than 55% of total number of setigers. First
20 branchiae digitiform, slightly shorter than notopodial cirri.
In last several branchial setigers branchiae short spurs on dorsal
side of notopodial cirri; spurs forming part of vascularized
sleeves surrounding bases of notopodial cirri (Figure 79j) in
varying number of median setigers. Spurs decreasing in size
posteriorly, disappearing at about setigers 40-50.
All neuropodial acicular lobes symmetrically conical; aciculae
emerging at midline. Anterior presetal lobes excavate,
becoming low, transverse folds by setiger 25. All postsetal
lobes low, transverse folds. First 9 ventral cirri thick, tapering.
Median ventral cirri basally inflated. Inflated bases very large,
nearly spherical; narrow tips digitiform. From about setiger 20
inflated bases rapidly reduced, completely missing by setiger
30. Posterior ventral cirri triangular, tapering to distinct tips.
Anterior notopodial cirri very long, nearly filiform, with 6 to 8
cylindrical articulations. Notopodial cirri reduced to half length
by setiger 20, without articulations. Posterior notopodial cirri