A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 177
Filaments slender.
Neuropodial acicular lobes distally rounded; aciculae emerging
at midline. Pre- and postsetal lobes low, transverse folds.
First 2 ventral cirri thick, tapering. Ventral cirri basally inflated
in next 20 setigers. Inflated bases ovate; narrow tips tapering.
From about setiger 23 inflated bases decreasing. Posteriormost
ventral cirri tapering evenly. Notopodial cirri medially inflated,
becoming slender and digitiform in posterior setigers, without
articulations.
Limbatc setae slender, marginally serrated. Shafts of anterior
compound falcigers (Figure 57m,n) tapering evenly, becoming
distally inflated in median setigers, marginally smooth.
Appendages very long and slender, especially in anterior
setigers, bidentate. Anterior appendages with proximal teeth
very much smaller than distal teeth, forming a small, triangular
lateral projection. Distal teeth nearly erect, tapering. In median
and posterior appendages proximal teeth larger, triangular,
usually directed basally. Distal teeth distinctly curved, directed
laterally. All guards tapering to fine slender tips, mucronate.
Guards very long, especially in anterior setigers. Pseudocompound
falcigers and compound spinigers absent. Aciculae
single, yellow, tapering, distally blunt, straight or gently
curved; cross-sections round. Separation between core and
sheath indistinct in both aciculae and subacicular hooks.
Subacicular hooks (Figure S7o) yellow, tridentate with teeth in
a crest. Hooks first present from setiger 18, present in all
setigers thereafter, at first single, but all posterior setigers with
at least 3, usually 4 hooks. Main fangs large, curved; median
fang similar in shape but smaller, distal fang very small, but
usually distinctly pointed.
UNKNOWN MORPHOLOGICAL FEATURES.—Jaw structure; all
features associated with posterior setigers; pygidium and anal
cirri.
EXPECTED STATES OF SELECTED UNKNOWN FEATURES.—
Mx III long and located behind left Mx II.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 56, 58, 59. Unknown
Characters: 1, 2,4, 6,42,47, 50, 63,65-68.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Eunice indica is listed with similar species in
Tables 41 and 42. In addition to E. indica, E. tentaculata and E.
vittata have multiple subacicular hooks in most setigers. Eunice
indica and E. vittata both have the first branchia on setiger 3; E.
tentaculata has the first branchia on setiger 6. Eunice indica has
mucronate guards on the compound falcigers; E. vittata has
distally blunt guards.
Kinberg indicated that A-III should reach setiger 19; this
cannot be confirmed and would be unusually long, even for this
species.
Eunice indica has been widely reported from Indian Ocean
and western Pacific Ocean; a number of similar species have
been reported from this area, and the distribution of E. indica
proper must be considered unsettled.
91. Eunice interrupta Treadwell, 1906
FIGURE 58a-e; TABUES 41,44,46,47
Eunice interrupta Treadwell. 1906:1167-1168, figs. 45, 46.
MATERIAL EXAMINED.—Holotype, USNM 5211, and 5
paralectotypes, USNM 5417, Albatross sta 3850, 79-84 m,
coarse sand and broken shells; 1 paralectotype, USNM 5418
and 1 paralectotype, CAS TY74 (IZ No. 018795), Albatross sta
3940, Hawaii, Leeward lands, Laysan Island Light S84°, E7.0',
16 May 1902, 108-128 m, white sand and broken shells.
COMMENTS ON MATERIAL EXAMINED.—Both paratypes
from station 3940 have been dried out and are not considered
further. The description is based on the holotype, but comments
about variable features are included.
DESCRIPTION.—Holotype incomplete, of unknown sex, with
65 setigers; length 55 mm; maximal width 2 mm; length
through setiger 10,9 mm. Paratypes from sta 3850 2 complete
specimens with 79 and 69 setigers, respectively; other
paratypes incomplete.
Prostomium (Figure 58a) distinctly shorter and narrower
than peristomium, as deep as V2 of peristomium. Prostomial
lobes frontally rounded, dorsally flattened; median sulcus deep.
Eyes at base of A-I, dark. Antennae in horseshoe, evenly
spaced, similar in thickness. Ceratophores long in all antennae,
without articulations. Ceratostyles tapering, with up to 27
moniliform articulations in A-I I and A-III, articulated to bases
of styles. A-I to middle of anterior peristomial ring; A-I I and
A-III to setiger 2. A-III incomplete in holotype, complete in
several paratypes. Peristomium cylindrical, long; anterior
margin flared in holotype, but not in paratypes; muscular lower
lip distinct. Separation between rings distinct only ventrally;
anterior ring 5 /6 of total peristomial length. Peristomial cirri to
middle of anterior peristomial ring, slender and tapering, with
5 to 7 articulations.
Maxillary formula of paratype from USNM 5417 1+1, 4+5,
6+0, 4+7, and 1+1. Jaws completely decalcified, soft and
fragile.
Branchiae present, palmate, distinctly shorter than notopodial
cirri, reduced in mid-body region in some specimens.
Branchiae from setiger 5-7 either to setiger 24-26 or
continued to near the posterior end. Present on more than 65%
of total number of setigers in some specimens. Maximum 3
filaments at or near setiger 15. Most specimens with branchiae
to setigers 24-26; holotype and one of 2 complete paratypes
with single branchial filaments also present in posterior end
starting at setiger 50 (Figure 58b) or 55, continuing to posterior
end. Other complete paratype with branchiae only near anterior
end. Filaments digitiform.
Anterior neuropodial acicular lobes distally truncate; median
acicular lobes rounded; posterior acicular lobes triangular;
aciculae emerging at midline. Pre- and postsetal lobes low,
transverse folds. First 6 ventral cirri thick, tapering. Ventral
cirri basally inflated from about setiger 7. Inflated bases ovate;
narrow tips tapering. Ventral cirri increasingly slender and