A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 183
transverse folds. All ventral cirri thick, tapering, not distinctly
inflated anywhere, an inflation on body wall proximal to
ventral cirri present in most setigers, may represent remnant
inflated bases. Anterior notopodial cirri digitiform, about as
long as peristomial cirri. Notopodial cirri tapering with slightly
inflated bases in branchial region, becoming digitiform in last
20 setigers. Notopodial cirri without articulations.
Limbate setae long, slender. Pectinate setae (Figure 59h)
number at least 10 in a parapodium, tapering, furled. Both
marginal teeth longer than other teeth, with -20 teeth. Shafts of
compound falcigers (Figure 59i) inflated, marginally serrated.
Appendages short, tapering; heads distinct, bidentate. Both
teeth equally well developed. Proximal teeth narrowly tapering,
directed laterally. Distal teeth tapering, nearly erect. Guards
short, symmetrically bluntly pointed, nearly rounded, marginally
serrated; mucros absent. Pseudocompound falcigers and
compound spinigcrs absent. Aciculae single, yellow, smoothly
tapering, straight; cross-sections round. Separation between
core and sheath indistinct in both aciculae and subacicular
hooks. Subacicular hooks (Figure 59g) yellow, bidentate.
Hooks first present from setiger 31, present in all setigers
thereafter, always single (except for replacements). Proximal
teeth much larger than distal teeth, triangular, directed
obliquely laterally. Distal teeth triangular, erect. Guards short
and truncate.
UNKNOWN MORPHOLOGICAL FEATURES.—Relationship between
Mx III and left Mx IV; pygidium and anal cirri.
EXPECTED STATES OF SELECTED UNKNOWN FEATURES.—
None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 51, 54, 55, 58, 59.
Unknown Characters: 4, 6, 42.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Eunice johnsoni is listed with similar species in
Tables 22 and 23. Of the species listed in Table 22, E. johnsoni
and E. schizobranchia have a very late start of the branchiae;
the other species have branchiae from setigers 3-6. The
subacicular hooks and aciculae are both yellow in E. johnsoni.
In E. schizobranchia, the aciculae are black, whereas the
subacicular hooks are yellow.
96. Eunice kerguelensis Averincev, 1974
FIGURE 60a-c; TABLES 41,43,46,49
Eunice kerguelensis Averincev, 1974:172, pi. 31: figs. 11-14.
MATERIAL EXAMINED.—Holotype, ZIL, 1/15808, Antarctic
Ocean near Kerguelen Island, 49°38'7"S, 70 o 43'7",OB sta 121,
141 m, 20 May 1956, coll. Averincev, Ushakov, Belayev.
COMMENTS ON MATERIAL EXAMINED.—The anterior end
has been deeply dissected and especially the peristomium has
been partially reconstructed in the illustration.
DESCRIPTION.—Holotype incomplete, of unknown sex, with
26 setigers; length 4 mm; maximal width 0.3 mm; length
through setiger 10, 1.2 mm. Body cylindrical throughout
Prostomium (Figure 60c) about as long as peristomium,
about as wide as peristomium, as deep as l /2 of peristomium.
Prostomial lobes frontally rounded, dorsally very slightly
inflated; median sulcus shallow. Eyes between bases of A-I and
A-II, large reddish. Antennae in horseshoe, evenly spaced,
similar in thickness. Ceratophores ring-shaped in all antennae,
without articulations. Ceratostyles digitiform, with up to 9
angular articulations in A-III. A-I to posterior peristomial ring;
A-II (only 1 present) to setiger 4; A-III to setiger 4.
Peristomium cylindrical, with distinct muscular lower lip.
Separation between rings distinct on all sides; anterior ring ~ 2 /3
of total peristomial length. Peristomial cirri to middle of
anterior peristomial ring, digitiform, without articulations.
Maxillary formula 1+1,8+11,8+0,7+10, and 1+1 according
to Averincev (1974:172).
Branchiae present, palmate, longer than notopodial cirri, not
reduced in mid-body region. Branchiae from setiger 3
(according to Averincev, both parapodia on setiger 3 now
missing) to end of fragment. Where best developed, branchiae
with 2 slender tapering filaments. Filaments of same length as
notopodial cirri.
Neuropodial acicular lobes distally rounded; aciculae emerging
at midline. Pre- and postsetal lobes low, transverse folds.
First 3 ventral cirri thick, tapering. Ventral cirri becoming
basally inflated from setiger 4-5. Inflated bases ovate; narrow
tips tapering. Inflated bases retained to end of fragment
Notopodial cirri basally slightly inflated, tapering to narrow
tips, without articulations.
Limbate setae marginally smooth. Pectinate setae now
missing, illustrated by Averincev (1974, pi. 31: fig. 13) as
tapering, with 1 marginal tooth very much longer than other
teeth, with -10 teeth totally. Shafts of compound falcigers
(Figure 60a) inflated, marginally serrated. Appendages slender,
tapering; heads large, bidentate. Proximal teeth smaller than
distal teeth, tapering, directed basally. Distal teeth curved,
directed nearly laterally. Guards symmetrically sharply
pointed, sometimes appearing mucronate. Pseudocompound
falcigers and compound spinigers absent. Aciculae mostly
paired, yellow, tapering, straight; cross-sections round. Separation
between core and sheath indistinct in both aciculae and
subacicular hooks. Subacicular hooks (Figure 60b) yellow,
tridentate with teeth in a crest Hooks first present from setiger
19, present in all setigers thereafter always single (except for
replacements). Hooks with large curved main fangs. Fangs
decreasing evenly in size distally.
UNKNOWN MORPHOLOGICAL FEATURES.—Relationship between
Mx III and left Mx IV; all features associated with
posterior parapodia; pygidium and anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—The high number of teeth in Mx III suggests that this
jaw piece was long and located behind left Mx II rather than
part of a distal arc.