A Review of the Genus Eunice - Smithsonian Institution Libraries

310
TURES.—Mx III short; forming part of distal arc with left Mx
rv.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 22, 34, 56, 58, 59.
Unknown Characters: 42, 74,78.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Eunice spongicola was considered a synonym
olE.filamentosa by Hartman (1956); the former has very short
antennae and the inflated bases of the ventral cirri are ovate; in
E. filamentosa the antennae reach well beyond the tip of the
antennae and the inflated bases form thick transverse ridges.
Eunice spongicola is listed with similar species in Tables 33
and 39. It is one of two species with hammer-headed aciculae
listed in Table 39, the other being E. denticulata. The
ceratophores are long in all antennae in E. denticulata; they are
short and ring-shaped in E. spongicola. In E. denticulata the
subacicular hooks start -10 segments before the start of the
branchiae; in E. spongicola the start of branchiae and
subacicular hooks are separated only by two segments.
183. Eunice stanleyi, new species
FIGURE 105g-l; TABLES 24, 25
Eunice antillensis Ehlers, 1887:84-85 [in pan].
MATERIAL EXAMINED.—Holotype, MCZ 810,1 syntype of
Eunice antillensis Ehlers, Blake sta 45,25°33'N, 84°21'W, 185
m.
COMMENTS ON MATERIAL EXAMINED.—As indicated above,
the material of E. antillensis was composed of two species, one
of which appears to have been overlooked previously.
DESCRIPTION.—Holotype complete, of unknown sex, with
130 setigers; total length 58 mm; maximal width 4 mm wide;
length through setiger 10, 7 mm. Body cylindrical; parapodia
very short; anterior end truncate.
Prostomium (Figure 105g) distinctly shorter and narrower
than peristomium, as deep as x h of peristomium. Prostomial
lobes frontally rounded, dorsally inflated; median sulcus deep.
Eyes posterior to bases of A-I, black, hidden below peristomial
fold. Antennae in shallow horseshoe; A-I separated from A-I I
and III by distinct gap, similar in thickness. Ceratophores
ring-shaped in all antennae, without articulations. Ceratostyles
digitiform, with up to 11 cylindrical articulations in A-III. A-I
to posterior edge of peristomium; A-II to setiger 3; A-III to
setiger 6. Peristomium cylindrical, somewhat longer ventrally
than dorsally. Separation between rings distinct dorsally and
barely noticeable ventrally; anterior ring 3 /4 of total peristomial
length. Peristomial cirri to middle of peristomium, tapering,
with 4 articulations.
Jaws not examined.
Branchiae present, palmate, distinctly longer than notopodial
cirri, not reduced in mid-body region. Branchiae from setiger 4
to setiger 33. Branchiae terminating well before posterior end,
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
present on less than 55% of total number of setigers. First 8 and
last 8 branchiae single filaments (Figure 105h); maximum 2
filaments, found scattered from setiger 12 through setiger 25.
Filaments short, thick, longer than notopodial cirri in most
setigers.
Anterior neuropodial acicular lobes distally truncate, becoming
rounded to triangular posteriorly; aciculae emerging at
midline. Pre- and postsetal lobes low, transverse folds. First 3
ventral cirri thick, tapering, rather prominent. In branchial
region ventral cirri with indistinctly inflated bases; postbranchial
ventral cirri tapering. Inflated bases ovate; narrow tips
tapering. Notopodial cirri basally slightly inflated, tapering to
digitiform tips, with 3 distinct articulations.
Limbate setae slender, with narrow limbations. Pectinate
setae (Figure 105k) short, flaring, flat. One marginal tooth
thicker and longer than other teeth, with -15 teeth. Shafts of
anterior compound falcigcrs (Figure 1051) slightly inflated,
marginally serrated. Shafts of posterior falcigcrs (Figure 105i)
tapering, marginally smooth. Anterior appendages with very
low, triangular, laterally directed proximal teeth and gently
curved distal teeth, bidentatc. Posterior appendages with long,
tapering proximal teeth and distal teeth more distinctly bent
than in anterior appendages. Guards asymmetrically bluntly
pointed; anterior guards marginally serrated; posterior guards
marginally smooth; mucros absent. Pscudocompound falcigcrs
and compound spinigers absent. Aciculae paired, dark brown,
tapering, straight; cross-sections round. Subacicular hooks
(Figure 105j) dark brown to black, bidentatc. Hooks first
present from setiger 29, present in all setigers thereafter, always
single (except for replacements). Hooks tapering. Proximal
teeth much larger than distal teeth, triangular, directed laterally.
Distal teeth narrow, tapering, erect.
UNKNOWN MORPHOLOGICAL FEATURES.—Jaw structure;
pygidium and anal cirri.
EXPECTED STATES OF SELECTED UNKNOWN FEATURES.—
Mx III forming distal arc with left Mx IV; Mx VI absent.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 34, 56, 58, 59. Unknown
Characters: 4, 6, 74, 78.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Eunice stanleyi is listed with similar species in
Tables 24 and 25. It was discussed in relation to the rather
similar E. dubitata above. In addition to the distributional
differences mentioned there, the two species differ in the
structure of the compound hooks. The appendages of these
hooks have nearly erect, distal teeth in E. dubitata and have
distinctly bent distal teeth in E. stanleyi. In the subacicular
hooks of E. dubitata, the proximal teeth are narrower than the
distal teeth; in E. stanleyi, the proximal teeth are very much
thicker than the distal teeth.
ETYMOLOGY.—The species is named for Mr. Stanley S.
Hirsch, who at a very important time gave the author much
needed assistance.