A Review of the Genus Eunice - Smithsonian Institution Libraries

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bidentate. Hooks first present from setiger 24-31, present in all
setigers thereafter, always single (except for replacements).
Hooks subdistally curved; head large; both teeth strongly
curved, directed laterally. Proximal teeth about twice as large as
distal teeth. Guards truncate.
DESCRIPTION OF Nicidion incerta.—Holotype complete, of
unknown sex, with 158 seugers; total length 38 mm; maximal
width 1.5 mm at setiger 20; length through setiger 10,2.75 mm;
width at setiger 10, 1.25 mm. Body ventrally flattened
anteriorly, becoming cylindrical medially and retaining that
shape for the rest of body. Truncate anteriorly, slowly tapering
posteriorly. Pygidium is dorsally smooth; only the short anal
cirri are present.
Prostomial lobes (Figure 29q) frontally rounded, dorsally
slightly inflated; median sulcus shallow. Eyes not observed
(illustrated as being behind and between A-I and A-II in
Hansen, 1882). Antennae in shallow horseshoe, evenly spaced
and similar in thickness. Ceratophorcs short, ring-shaped.
Ceratostyles thick, digitiform, without articulations. A-I to
middle of anterior peristomial ring; A-II to middle of posterior
peristomial ring; A-III to middle of posterior peristomial ring,
slightly outreaching A-II. Nuchal fold with lateral notch; lower
lip entire. Peristomium tapering anteriorly. Separation between
rings distinctly dorsally and ventrally; anterior ring ~ 3 A» of total
peristomial length. Peristomial cirri barely outreaching posterior
peristomial ring, thick, ovate, without articulations.
Jaws not examined.
Branchiae absent.
Neuropodial acicular lobes symmetrically rounded. Pre- and
postsetal lobes low, transverse folds. Ventral cirri tapering
through first 9 setigers, distinctly inflated from about setiger
10. Inflated bases large, spherical; distal tips digitiform.
Inflated bases decreasing in size from about setiger 60 and
totally missing posterior to setiger 100. Posterior ventral cirri
short, thick, tapering; distinctly shorter than notopodial cirri.
Notopodial cirri well separated from neuropodial acicular
lobes, thick, without articulations. Anterior neuropodial cirri
digitiform. Median and posterior neuropodial cirri tapering.
Limbate setae medially thick, marginally serrated, slightly
longer than other setae. Pectinate setae not seen. Shafts of
posterior compound falcigers (Figure 29p) distally inflated,
without distinct beaks, marginally serrated, without internal
striations. Appendages short, tapering, with distinct heads.
Proximal teeth about as large as distal teeth, narrowly tapering,
directed slightly to distinctly distally. Distal teeth tapering,
directed obliquely distally, slender. Guards of posterior
compound hooks symmetrically rounded, without mucros or
marginal serrations. Posterior aciculae single, about as thick as
subacicular hooks, brown, without distinct separation between
sheath and core, tapering to blunt tips, straight. Subacicular
hooks (Figure 29o) single, brown, without separation into
sheath and core, bidentate. Hooks abruptly tapering to distinct,
bent necks. Proximal teeth longer than distal teeth, erect,
straight or slightly tilted distally, erect. Distal teeth short, thick,
blunt, erect.
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
UKNOWN MORPHOLOGICAL FEATURES.—Pygidium and anal
cirri.
EXPECTED STATE OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 22, 31-42, 56, 58, 59.
Unknown Characters: 74, 78.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—According to G. Hartwich (in litt.), a label in
the vial indicated that three of these specimens should be the
types of E. gagzoi Augcner (1922b). This label reads (in
translation from German): "Eunice Gagzoi n.sp. (cariboea Gr.
partim). 2 complete specimens without, one complete specimen
with a few scattered branchiae." The original description of E.
gagzoi is very brief and contains no discussion of the
relationship between E. cariboea and E. gagzoi.
One clue to the identity of the specimens that he considered
types of his new species is available. Augcner indicated that
one of the types should consist of 161 segments and be 32 mm
long. No such specimen is present in the Berlin material. Two
posteriorly branchiaicd specimens in the Hamburg collections
arc labeled as original material of E. gagzoi. and one of these
matches the size and length mentioned by Augcner closely.
These two specimens were selected as lectotypes of E. gagzoi
and are described below. No specimens from ZMB belong to £.
gagzoi; they are E. cariboea as here defined or go to E.
excariboea (see below).
Specimens of E. cariboea may be confused with small
specimens oiE.filamentosa from which they clearly differ in
the shape of the subacicular hooks, by the total absence of
branchiae, and by the tapering, rather than hammer-headed
acicula. Eunice cariboea can be separated from E. gagzoi on a
similar set of characters, except that in the latter the aciculae are
abruptly tapering with a short, bent tip, rather than hammerheaded
as in E. filamentosa or smoothly tapering and gently
curved as in E. cariboea. As indicated, E. cariboea is here
restricted to include only abranchiate forms; the two other
species confounded with E. cariboea in the type lot are both
branchiated, but are otherwise dissimilar. One of these species,
E. gagzoi, was discussed above; the other one is herein newly
recognized as E. excariboea (see below).
Eunice cariboea is listed with similar species in Tables 33
and 40. Five abranchiate species lack antcnnal articulations, in
addition to E. cariboea; these include E. cincta, E. goodei, E.
imogena, and E. wasinensis. Of these, E. imogena has
subacicular hooks first present from about setiger 50; the other
four species have hooks present from about setiger 15 through
setiger 31. Eunice cincta lacks inflated bases to the median
cirri; the other species listed all have inflated bases. These bases
are thick, transverse welts in E. cariboea and E. wasinensis and
ovate in the other two species. Eunice cariboea and E.
wasinensis can be separated on various differences in soft-body