A Review of the Genus Eunice - Smithsonian Institution Libraries

298
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
Mayeria, on the grounds that Mayer's eunicid species could not
be referred to a dorvilleid genus. I am not convinced that the
Atlantic palolo can be identified with E. schemacephala and
prefer to use the name E.fucata Ehlers for the species described
in great detail by Ebbs; presumably the same seen by Mayer.
The names associated with Mayer's species are listed also
under E.fucata.
Eunice schemacephala is indeterminable.
177. Eunice schizobranchia Claparede, 1870
FIGURE lOOi-q; TABLES 22,23
Eunice schizobranchia Claparede, 1870:394, pi. 2: fig. 6.—Fauvel, 1923:407-
408, fig. 160 a-k.
MATERIAL EXAMINED.—One specimen, MNHN, Paris, Gulf
of Naples, Oct. 1899, identified by P. Fauvel.
DESCRIPTION.—Specimen complete with 731 setigers plus
short, regenerating posterior end with pygidium; total length
655 mm; maximal width 5 mm at setiger 10; length through
setiger 10, 10 mm. Body cylindrical through first half,
thereafter tapering very nearly imperceptibly towards posterior
end. All segments of about the same length, with relatively
short laterally situated parapodia.
Prostomium (Figure 1001) distinctly shorter and narrower
than peristomium, less than '/2 as deep as peristomium.
Prostomial lobes frontally obliquely truncate, dorsally flattened,
sloping from posteromedial region obliquely forwards;
median sulcus distinct ventrally, very short dorsally. Eyes not
observed. Antennae in a horseshoe with A-I and A-II emerging
close together, well lateral to midline; A-III isolated on small
medial elevation, similar in thickness. Ceratophores ringshaped
in all antennae, without articulations. Ceratostyles
slender and tapering, without articulations. A-I and A-III to
middle of anterior peristomial ring; A-II to setiger 1.
Peristomium flaring anteriorly; lower lip large and muscular.
Separation between rings distinct dorsally and ventrally;
anterior ring 5 /6 of total peristomial length. Peristomial cirri
barely reaching posterior 73 of anterior peristomial ring,
slender and digitiform, without articulations.
Maxillary formula 1+1,4+4, 6+0, 2+6, and 1+1. Mx III part
of arc with left Mx IV. Mx V reduced with barely distinct teeth.
Mx VI absent.
Branchiae (Figure lOOq) present, pectinate, distinctly longer
than notopodial cirri, not reduced in mid-body region, erect.
Branchiae from setiger 67 to setiger 730. Branchiae present to
near posterior end, present on more than 65% of total number
of setigers. First 100 branchiae single filaments; maximum
seven filaments. Number of filaments retained through rest of
body; even in last branchiated setigers 6 filaments may be
present. Branchial stems short, strongly tapering. Filaments
long and digitiform, outreaching notopodial cirri in all but few
first setigers.
Anterior neuropodial acicular lobes (Figure lOOi) rounded
with aciculae emerging above midline, above emergence of
aciculae distinct, tapering cirri present. Median and posterior
neuropodial acicular lobes triangular, retaining small superior
tab even in last setigers. All presetal lobes low, transverse folds.
Anterior postsetal lobes higher than acicular lobes and rounded,
following outline of acicular lobes closely from about setiger
30. First 9 ventral cirri tapering to digitiform tips. Ventral cirri
basally inflated from setiger 10 through rest of body. Inflated
bases nearly spherical; narrow tips tapering. Bases of posterior
ventral cirri thick, transverse welts; narrow tips short and
button-shaped. All notopodial cirri basally slightly inflated,
retaining same length throughout, decreasing in thickness
posteriorly, without articulations.
Limbate setae marginally serrated. Pectinate setae (Figure
100m), apparently missing in first 20 setigers, slender,
tapering, furled with thickened margins. One marginal tooth
very long; -7 rather coarse teeth present. Compound falcigers
in thick, double fascicles in anterior setigers, decreasing in
numbers posteriorly, reduced to single anterior fascicle by
setiger 25. Shafts of compound falcigers (Figure lOOj.k.p)
slightly inflated, marginally serrated; internal striations and
beaks distinct. Appendages of hooks in anterior fascicles of
anterior setigers (Figure 100k) long and slender, tapering,
bidentate. Both teeth distinct and slender. Proximal teeth
slightly smaller than distal teeth, directed laterally. Distal teeth
slender and nearly erect. In posterior fascicles of anterior
setigers, especially towards upper ends of fascicles appendages
relatively longer and teeth reduced (Figure 100J). Proximal
teeth small knobs and distal teeth short, erect knobs. In
posterior setigers appendages long, slender and tapering
(Figure lOOp); head large. Proximal teeth large, laterally
directed, triangular. Distal teeth curved, very much smaller than
proximal teeth. Guards longer than appendages in all hooks,
symmetrically rounded and marginally strongly serrated;
mucros absent. Pseudocompound falcigers and compound
spinigers absent. All aciculae (Figure lOOo) tapering, distally
straight; cross-sections round. In anterior setigers up to 4
aciculae in oblique series, in posterior setigers all aciculae
single. Anterior aciculae black, becoming lighter posteriorly,
light brown near posterior end. Subacicular hooks (Figure
lOOn) clear and translucent, rather than yellow, bidentate.
Hooks first present from setiger 60, first irregularly occurring,
by setiger 300 present in all setigers, always single (except for
replacements). All hooks emerging nearly at right angles with
aciculae, projecting well beyond ventral cirrus in all setigers.
Hooks distally tapering. Proximal teeth larger than distal teeth;
both teeth directed distally.
UNKNOWN MORPHOLOGICAL FEATURES.—Pygidium
anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 22, 56, 60. Unknown
Characters: 13, 14,42, 74, 78.
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