A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 67
Subacicular hooks (Figure 14e) black, bidentate, slender and
tapering. Hooks first present from setiger 19-22, present in all
setigcrs thereafter, always single (except for replacements).
Proximal teeth larger than distal teeth, directed laterally; distal
teeth short, blunt, directed distally.
UKNOWN MORPHOLOGICAL FEATURES.—Features associated
with far posterior sctigers.
EXPECTED STATE OF SELECTED UNKNOWN FEATURES.—
None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 14, 56. Unknown
Characters: 1, 2, 36, 37, 57-60, 63, 74, 78.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—37,1.
REMARKS.—Eunice argentinensis is listed with similar
species in Tables 27 and 29. Among the species in group B-2,
E. argentinensis, E.floridana, and E. prognatha have at least in
part knife-edged aciculae (£. argentinensis is the only one of
these in Table 29). Eunice argentinensis has subacicular hooks
first present from setigers 19-22, E. floridana has them from
setigers 29-40, and E. prognatha from setiger 35. Eunice
floridana has very long, slender antennae, with A-III distinctly
longer than the other antennae; the other two species have short
antennae where A-II and A-III are rather similar in size. In E.
prognatha the first 8-10 branchiae are simple filaments; all
anterior branchiae are pectinate with at least five filaments in E.
argentinensis.
18. Eunice armillata (Treadwell, 1922)
FIGURE 15; TABLE 23
Leodice armillata Treadwell, 1922:144-146, figs. 26-29, pi. 3: figs. 14-19.
MATERIAL EXAMINED.—Holotype, AMNH V-1920-1542,
Aua or Utile reef, Pago Pago Harbor, Samoa.
DESCRIPTION.—Holotype complete, of unknown sex, with
114 setigers; total length 46 mm; maximal width 2 mm at
setiger 15; length through setiger 10,6 mm; width at setiger 10,
1.75 mm. Anterior body cylindrical, becoming dorsoventrally
flattened medially and tapering slowly towards posterior end.
Prostomium (Figure 15a) distinctly shorter than and narrower
than peristomium, less than l /2 as deep as peristomium.
Prostomial lobes frontally rounded, dorsally inflated; median
sulcus deep. Eyes not observed. Antennae in a transverse line,
evenly spaced, similar in thickness. Ceratophores erect cylinders
in all antennae, without articulations. Ceratostyles tapering,
with up to 14 moniliform articulations. A-I to posterior
peristomial ring; A-II to setiger 2; A-III to setiger 3.
Peristomium cylindrical. Separation between rings distinct on
all sides; anterior ring 4 /5 of total peristomial length. Peristomial
cirri barely outreaching posterior peristomial ring, slender
and digitiform, without articulations.
Jaws not examined.
Branchiae (Figure 15e,f) present, pectinate, distinctly longer
than notopodial cirri, not reduced in mid-body region, erect.
Branchiae from setiger 6 to setiger 109. Branchiae present to
near posterior end, present on more than 65% of total number
of setigers. First 2 pairs single filaments, thereafter 2 filaments
in most setigers to setiger 80; a third, short filament present
scattered in a few setigers. From setiger 80, 1 or 2 filaments
irregularly scattered in about equal numbers of setigers. Stems
short, tapering. Filaments digitiform, longer than notopodial
cirri.
Neuropodial acicular lobes truncate with aciculae emerging
in upper 73 of lobe. Presetal lobes transverse folds. Anterior
postsetal lobes longer than acicular lobes, rounded, reduced to
transverse folds from setiger 15. Ventral cirri without basal
inflation in 5 anterior setigers; anterior ventral cirri digitiform.
Median ventral cirri basally inflated. Bases ovate or nearly
spherical, narrow tips tapering. Inflation rapidly reduced from
setiger 45 and missing posterior to setiger 60. Posterior ventral
cirri without basal inflation, becoming increasingly digitiform.
Notopodial cirri digitiform, decreasing somewhat in length
posteriorly, with up to 3 indistinct articulations in anterior and
median setigers. Far posterior notopodial and ventral cirri
similar in length and shape.
Limbate setae longer than all other setae, coarsely limbate,
marginally serrated. Pectinate setae (Figure 15b) very small;
shafts cylindrical, thick. Blades distally narrowly flaring, flat.
Both marginal teeth barely longer than other teeth, with about
10 teeth. Shafts of compound falcigers in anterior setigers
(Figure 15c) tapering, serrated, with distal beak. In posterior
setigers tapering, without serrations and beaks (Figure 15d).
Appendages very short, stocky, bidentate. Proximal teeth
slightly shorter than distal teeth, narrowly triangular, directed
obliquely distally. Distal teeth tapering, directed laterally,
distinctly more curved in posterior than in anterior setigers.
Guards asymmetrically bluntly pointed, marginally finely
serrated, without mucros. Pseudocompound falcigers and
compound spinigers absent. Aciculae paired, yellow, very
heavy, distally tapering to sharp tips; inferior aciculae gently
curved; cross-section of all aciculae round. Separation of core
and sheath indistinct in both aciculae and subacicular hooks.
Subacicular hooks yellow, bidentate. Hooks present from
setiger 34, present in all setigers thereafter, always single
(except for replacements); first several slender, becoming
increasingly heavy in posterior setigers, very coarse in far
posterior setigers (Figure 150- Hooks slightly tapering subdistally;
heads indistinct. Both teeth similar in size, directed
laterally.
UKNOWN MORPHOLOGICAL FEATURES.—Pygidium and anal
cirri; jaw apparatus.
EXPECTED STATE OF SELECTED UNKNOWN FEATURES.—Mx
III located immediately in front of left Mx IV; forming part of
a distal arc.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 56, 58, 59. Unknown
Characters: 13,14,40.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.