A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 123
a wide triangular base, nearly scoop-shaped. Ventral cirri
basally inflated in branchial region; bases ovate; narrow tips
tapering. Anterior notopodial cirri basally distinctly inflated
with a narrowed attachment to body wall. Notopodial cirri
decreasing in length in branchial region, retaining similar shape
in all setigers. Notopodial cirri without articulations.
Limbate setae slender, nearly capillary. Pectinate setae
(Figure 38f) in thick fascicles. Shafts wide, cylindrical. Blades
narrow, tapering, furled. Both marginal teeth longer than other
teeth; with -15 teeth. Prebranchial setigers with compound
falcigers in thick fascicles; numbers of falcigers decreasing
posteriorly; in last segments present only 4 or 5 in each
parapodium. Shafts (Figure 38d) tapering and marginally
serrated, with distinct beaks. Appendages large, head distinct,
bidentate. Proximal teeth smaller than distal teeth, narrowly
tapering, directed laterally. Distal teeth long, slender, blunttipped,
directed obliquely distally. Guards symmetrically
bluntly pointed, marginally coarsely serrated; mucros absent.
Pseudocompound falcigers and compound spinigers absent.
Aciculae single, dark yellow in anterior setigers, darkening to
dark brown in last segments, tapering to smooth, sharp tips;
cross-section round. Subacicular hooks (Figure 38e) brown,
bidentate. Hooks first present from setiger 28, present in all
setigers thereafter, always single (except for replacements).
Hooks distally abruptly tapered. Proximal teeth larger than
distal teeth, directed laterally. Distal teeth erect.
UNKNOWN MORPHOLOGICAL FEATURES.—Relationship between
Mx III and left Mx IV; features associated with far
posterior setigers, including branchial distribution; pygidium
and anal cirri.
EXPECTED STATES OF SELECTED UNKNOWN FEATURES.—
Mx III forms part of distal arc with left Mx IV; branchiae
continued to near posterior end.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 22, 56. Unknown
Characters: 1,2,36,38,40,42,47,50,51,57-60,63,74,78.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—37,1;
38,1.
REMARKS.—The strongly flattened body and the large
numbers of compound hooks in anterior setigers are features
often present in the genus Marphysa. Other features, most
importantly the presence of peristomial cirri, align the species
with the genus Eunice. It is listed with similar species in Tables
33 and 38 and can be separated from all other species in these
tables by the body form.
53. Eunice djiboutiensis Gravier, 1900
FIGURE 38g-i; TABLES 27,28
Eunice aphroditois djiboutiensis Gravier, 1900:224-229, figs. 73-77, pi. 13:
figs. 63, 67.
MATERIAL EXAMINED.—One syntype, MNHN, Paris, Djibouti,
coll. Jousseaume and Goudieu, 1897.
COMMENTS ON MATERIAL EXAMINED.—The anterior end
has been flattened and details of the prostomium and
peristomium are difficult to distinguish. Gravier originally had
two specimens.
DESCRIPTION.—Syntype with 318 setigers, missing a few
setigers posteriorly; length 320 mm; maximal width 10 mm at
setiger 10; length through setiger 10,20 mm. Body cylindrical,
very stiff, dark reddish brown.
Prostomium distinctly shorter than peristomium. Prostomial
lobes apparently frontally rounded, dorsally slightly inflated;
median sulcus deep. Eyes at bases of A-I. Antennae in a straight
line, evenly spaced, similar in thickness. Ceratophores ringshaped
in all antennae, without articulations. Ceratostyles
incomplete, apparently digitiform, rather thick, without articulations.
No antennae projecting beyond peristomium. Peristomium
massive, cylindrical; lower lip and nuchal folds
scalloped. Separation between rings distinct dorsally and
ventrally; anterior ring 8 /9 of total peristomial length. Peristomial
cirri to middle of anterior peristomial ring, without
articulations, basally inflated, tapering to thick, digitiform tips,
without articulations.
Maxillary formula according to Gravier (1900:227-228)
1+1,5+6, 6+0,4+8, and 1+1.
Branchiae (Figure 38i) present, pectinate, distinctly longer
than notopodial cirri, not reduced in mid-body region, erect.
Branchiae from setiger 5 to end of specimen. All branchiae
with two or more filaments; maximum 25 filaments; number of
filaments reduced slowly posteriorly to about 5. Branchiae
longer than notopodial cirri in anterior 2 /3 of body; posterior
notopodial cirri clearly longer than branchiae. Total length of
branchiae is less than l /2 body width in all setigers. Anterior
stems short, thick, tapering stiff; posterior stems slender,
digitiform. Filaments thick, digitiform, shorter than notopodial
cirri.
Anterior neuropodial acicular lobes wide and truncate;
posterior acicular lobes also truncate, but narrower with
aciculae emerging above midline. Pre- and postsetal lobes low
folds. First 5 ventral cirri thick, tapering, thereafter modestly
basally inflated through next 20-30 setigers. Inflated bases
ovate, narrow tips digitiform. Inflated bases gradually reduced;
ventral cirri broadly transversely attached tapering to digitiform
tips in last 150 setigers. Notopodial cirri basally inflated,
tapering to thick, digitiform tips, without articulations.
Limbate setae frayed marginally. Pectinate setae (Figure
38h) numbering up to 25 in a parapodium. Shafts wide,
cylindrical. Blades flat, flaring. One marginal tooth longer than
other teeth; with 15-25 teeth. Shafts of compound falcigers at
least as thick as aciculae, tapering, marginally smooth,
copper-colored. All appendages lost, illustrated by Gravier
(1900, fig. 76) as short, triangular, bidentate. Proximal teeth
short, directed obliquely distally; distal teeth nearly erect; small
bosses apparently present between proximal and distal teeth.
Guards asymmetrically bluntly pointed; mucros absenL Pseudocompound
falcigers and compound spinigers absent. Acicu-