A Review of the Genus Eunice - Smithsonian Institution Libraries

180
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
antennae, without articulations. Ceratostyles tapering, with up
to 20 short, cylindrical articulations in A-III. A-I to posterior
peristomial ring; A-I I to setiger 6; A-III to setiger 12 when
folded back over dorsum. Peristomium slightly wider than
prostomium, tapering anteriorly. Separation between rings
distinct dorsally and ventrally; anterior ring 5 /6 of total
peristomial length. Peristomial cirri to posterior edge of
prostomium, digitiform, with 3 to 4 cylindrical articulations.
Maxillary formula 1+1,4+4,8+0,5+8,and 1+1. Mx III part
of distal arc with left Mx IV. Mx VI absent. Jaws friable; right
Mx IV damaged so number of teeth uncertain.
Branchiae (Figure 58j) present, pectinate, distinctly longer
than notopodial cirri, not reduced in mid-body region, erect.
Branchiae from setiger 17 to end of fragment. Maximum 8
filaments in setigers 25 to 30. Stems long, erect in median
setigers, shortening rapidly posteriorly. Filaments relatively
thick, folded up against branchial stems, relative length of
filament increasing posteriorly, but shorter than notopodial cirri
in all setigers.
Neuropodial acicular lobes rounded; aciculae emerging
above midline. Presetal lobes low, transverse folds. Postsetal
lobes free, distinct lobes, higher than acicular lobes, becoming
reduced in size, following outline of acicular lobes in posterior
end of fragment. Ventral cirri thick, tapering; inflated bases
totally imperceptible. Notopodial cirri basally inflated, prominent,
with 2 to 3 long, cylindrical rings.
Limbate setae slender, marginally smooth. Pectinate setae
(Figure 58i) gently furled, slightly flaring. One marginal tooth
longer than other teeth, with 13 to 14 teeth. Shafts of compound
falcigers (Figure 58f) slender, tapering, marginally smooth.
Appendages narrow, tapering; heads distinct, bidentate. Proximal
teeth slightly longer than distal teeth, tapering, directed
obliquely distally. Distal teeth tapering, curved. Guards
symmetrically rounded, marginally smooth; mucros absent.
Pseudocompound falcigers and compound spinigers absent.
Aciculae single, with brown cores and clear sheaths, tapering,
straight; cross-sections round. Subacicular hooks (Figure 58h)
with brown cores; heads completely clear, nearly translucent,
bidentate. Hooks first present from setiger 23, present in all
setigers thereafter, always single (except for replacements).
Hooks tapering, with distinct head. Proximal teeth larger than
distal teeth, triangular, directed laterally. Distal teeth triangular,
erect.
UNKNOWN MORPHOLOGICAL FEATURES.—Relationship between
Mx III and left Mx IV; features associated with posterior
setigers, including branchial distribution; pygidium and anal
cirri.
EXPECTED STATES OF SELECTED UNKNOWN FEATURES.—
None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 51, 54, 55. Unknown
Characters: 1,2,6, 36-40,47, 50, 57-60,63.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—371-
38,1.
REMARKS.—Eunice jagori has remained incompletely
known since it was originally described; it is listed with similar
species in Tables 33 and 35. The ventral cirri are not basally
inflated in median setigers, which is an unusual feature in the
genus, but perhaps most characteristic is the crowding of the
posterior setigers, with the parapodia carried on fleshy ridges.
Eunice januarii Grube, 1881:111.
Eunice januarii Grube, 1881
REMARKS.—The material of this species currently present in
Zoologisches Museum, Berlin, consists of a large specimen and
two parapodia. It lacks peristomial cirri and has we 11-developed
fascicles of compound spinigers and lacks compound falcigers.
The species belong to the genus Marphysa and will be treated
in a review of that genus.
94. Eunice japonica, new name
FIGURE 59a-c; TABLES 19. 20
Eunice gracilis Moore, 1903:440-441. pi. 25: figi. 46-48.
Eunice longicirrala.—Imajima and Hartman, 1964:256 Inol Eunice longicirraw
Webster. 1884].
MATERIAL EXAMINED.—Holotype of E. gracilis Moore,
1903, USNM 15724, Albatross sta 3730, off Omae Zaki,
Honshu Island, Japan, approximate position 34°36'N,
138°14'E, 16 May 1900, 62-67 m, mud, gravel, rock.
COMMENTS ON MATERIAL EXAMINED.—Station 3730 was a
surface tow, according to the published station list; several
dredge and beam trawl hauls were taken off Omae Zaki on the
same day in approximately the same depths. The specimen may
have come from any one of these hauls. The position indicated
is that of the cape, Omae Zaki proper.
DESCRIPTION.—Holotype complete, of unknown sex, with
110 setigers; total length 50 mm; maximal width 2.5 mm;
length through setiger 10, 7 mm. Body cylindrical with
relatively long segments. Two pairs of anal cirri present;
ventral pair long; dorsal pair very short. All anal cirri with long,
cylindrical articulations.
Prostomium (Figure 59e) distinctly shorter and narrower
than peristomium, less than x li as deep as peristomium.
Prostomial lobes frontally rounded, dorsally flattened; median
sulcus shallow. Eyes between bases of A-I and A-I I. Antennae
in horseshoe, evenly spaced, similar in thickness. Ceratophores
ring-shaped in all antennae, without articulations. Ceratostyles
slender, tapering; articulations long, cylindrical in A-I I and
A-III, nearly moniliform in A-I. Maximum 10 articulations in
A-III; articulations indistinct towards bases of 3 longer
antennae. A-I to middle of anterior peristomial ring; A-II to
setiger 3; A-III to setiger 5. Peristomium cylindrical. Separation
between rings distinct on all sides, but especially distinct
dorsally; anterior ring ~ 3 A of total peristomial length. Peristomial
cirri to posterior half of prostomium, slender and tapering,