A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 235
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Eunice mutilatoides was characterized very
briefly by Augener (1922b) and has remained unreported since
that time. It is listed with similar species in Tables 25 and 26.
In addition to E. mutilatoides, the only species in Table 26 with
poorly developed, palmate branchiae and without articulations
of the ceratostyles is E. palauensis. The branchiae outreach the
notopodial cirri in E. palauensis; they are distinctly shorter
than the notopodial cirri in all setigers in E. mutilatoides.
132. Eunice narconi Baird, 1869
Eunice narconi Baird. 1869:350-351.
FIGURE 78d-g; TABLES 19,21
MATERIAL EXAMINED.—Three syntypes, BM(NH) ZB
1972.73, Narcon Island, Antarctic Seas, Erebus and Terror
Southern Seas Expedition, 1839-1843.
COMMENTS ON MATERIAL EXAMINED.—The type material
has been dried out at one time, so illustrating the soft-parts
would be meaningless. The material consists of three anterior
ends and some fragments of median and posterior setigers. One
anterior end is in very bad shape and even the number of
segments cannot be determined; the description is based on the
other two anterior fragments.
DESCRIPTION.—Larger fragment with about 75 setigers;
length 25 mm; maximal width 2 mm; length through setiger 10,
6 mm. Shorter fragment with about 50 segments; length 17
mm; maximal width 1.5 mm; length through setiger 10,5 mm.
Prostomium distinctly shorter and narrower than peristomium.
Prostomial lobes frontally rounded, dorsally inflated;
median sulcus shallow. Shape and length of antennae cannot be
determined. Peristomium cylindrical. Anterior peristomial ring
3 A of total peristomial length. Peristomial cirri short, without
articulations.
Jaws not examined.
Branchiae present, palmate. Branchiae from setiger 8 to
setigers 33-35. Branchiae terminating well before posterior
end, present on less than 55% of total number of setigers.
Where best developed at around setiger 15 at least 3 filaments
present.
Parapodial shape cannot be described in detail; ventral cirri
with distinctly inflated bases in branchial region.
Limbate setae slender, marginally finely serrated. Pectinate
setae (Figure 780 tapering, flat. One marginal tooth very much
longer and stronger than all other teeth; -10 teeth present
Shafts of compound falcigers (Figure 78g) distinctly inflated,
marginally serrated. Appendages long, narrow, bidentate. Both
teeth gently curved. Guards distally bluntly pointed, marginally
serrated; mucros absent Pseudocompound falcigers and compound
spinigers absent Aciculae (Figure 78e) paired, yellow,
tapering to blunt points, gently curved ventrally; cross-sections
round. Separation between core and sheath indistinct in both
aciculae and subacicular hooks. Subacicular hooks (Figure
78d) yellow, bidentate. Hooks first present from setiger 35-38.
Hooks distally curved. Proximal teeth larger than distal teeth.
Both teeth directed distally.
UNKNOWN MORPHOLOGICAL FEATURES.—Most prostomial
and peristomial features; jaw structure; nearly all parapodial
features; pygidium and anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 56, 58, 59. Unknown
Characters: 1, 2, 4, 6, 11-23, 25, 32-34, 39, 40, 43-52, 54,
55,57-64,81,82.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Eunice narconi has been considered incompletely
known (Augener, 1931:287). Hartman (1964:118)
synonymized it with some doubt with E. pennata. It agrees with
E. pennata in that it has yellow, bidentate subacicular hooks
and branchiae limited to some anterior segments. However, E.
pennata, at least in European waters, appears to have branchiae
starting at setigers 3-4, whereas in E. narconi branchiae do not
start before setiger 8. The two species differ about as much as
any two species in the groups do, so the synonymy is here
considered unacceptable.
Eunice narconi is listed with similar species in Tables 19 and
21; it is too poorly known to be included in the key.
133. Eunice nesiotes (Chamberlin, 1919)
FIGURE 79a-e; TABLES 27,31
Leodice nesiotes Chamberlin, 1919a:253-256, pi. 57: figs. 6, 7.
MATERIAL EXAMINED.—Holotype, USNM 19749, Albatross,
1899-1900 (no station indicated), Marshall Islands, 12
fathoms, came up on anchor.
COMMENTS ON MATERIAL EXAMINED.—The holotype has
been dried out or exposed to very strong alcohol at one time, so
most of notopodial cirri and branchiae are badly distorted.
DESCRIPTION.—Holotype incomplete mature female with
large eggs in body cavity of 101 setigers; length 90 mm;
maximal width 6 mm; length through setiger 10,10 mm.
Prostomium (Figure 79a) distinctly shorter and narrower
than peristomium, less than l fr as deep as peristomium.
Prostomial lobes frontally obliquely truncate, dorsally flattened,
tilted laterally; median sulcus shallow, continued as
ridge along prostomial midline. Antennae in a horseshoe, with
A-I isolated by a gap, similar in thickness. Ceratophores
ring-shaped in all antennae, without articulations. Ceratostyles
tapering, irregularly articulated with up to 5 long, cylindrical
articulations in A-III. A-I to posterior edge of peristomium;
A-II to setiger 7; A-III to setiger 10. Peristomium cylindrical,
somewhat ribbed dorsally, ventrally folded into several shallow
folds. Separation between rings distinct dorsally, and barely