A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 321
without articulations. Ceratostyles tapering, with up to 14
moniliform articulations in A-III. First articulation of ceratostyle
long and cylindrical. A-I to posterior peristomial ring;
A-II to setiger 1; A-III to setiger 2. Peristomium cylindrical.
Separation between rings distinct dorsally and ventrally;
anterior ring 5 /6 of total peristomial length. Peristomial cirri to
middle of anterior peristomial ring, tapering, with 4 long,
cylindrical or drop-shaped articulations.
Jaws not examined.
Branchiae present, pectinate, distinctly longer than notopodial
cirri, not reduced in mid-body region, erect. Branchiae
from setiger 3 through end of fragment. All branchiae with 2 or
more filaments; maximum number of filaments 7 at about
setiger 15. Posterior to setiger 30 most branchiae with 2 or 3
filaments (Figure 109b). Branchial stems short, tapering.
Filaments short, digitiform.
Anterior neuropodial acicular lobes distally truncate; median
and posterior acicular lobes distinctly more rounded; aciculae
emerging at midline. Pre- and postsetal lobes low, transverse
folds. First 4 ventral cirri thick, tapering; ventral cirri with
indistinctly inflated bases between setigers S and 30. Inflated
bases ovate; narrow tips tapering. Posterior ventral cirri thick
and tapering shape. Notopodial cirri basally slightly inflated,
tapering. Anterior notopodial cirri with up to 5 distinct, long
articulations; posterior notopodial cirri with 3 articulations.
Limbate setae marginally smooth. Pectinate setae (Figure
108d) narrow, tapering, flat. One marginal tooth longer than
other teeth; -12 teeth present. Shafts of compound falcigers
(Figure 109c) tapering, marginally indistinctly serrated. Appendages
short, nearly triangular, bidentate. Proximal teeth
smaller than distal teeth, reduced triangular, sharp-tipped,
directed laterally. Distal teeth thick, blunt, curved. Guards
asymmetrically bluntly pointed, marginally smooth; mucros
absent. Pseudocompound falcigers and compound spinigers
absent. Aciculae (Figure 109f) paired, chestnut-brown, tapering,
slightly curved dorsally; cross-sections round. Separation
between core and sheath distinct in both aciculae and
subacicular hooks. Subacicular hooks (Figure 109e) with
chestnut-brown shafts up through neck and clear heads,
bidentate. Hooks first present from setiger 32, present in all
setigers thereafter, paired in some setigers. Hooks tapering to
narrow necks; heads small. Proximal teeth larger than distal
teeth, directed obliquely distally. Distal tooth blunt, directed
obliquely distally. Guards blunt.
UNKNOWN MORPHOLOGICAL FEATURES.—Jaw structure;
pygidium and anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—Mx III short; forming part of distal arc with left Mx
IV.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 56, 58, 59. Unknown
Characters: 1, 2,4,6, 36-38,40.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—37,1;
38,1.
REMARKS.—Eunice torquata is compared to other species in
group B-2 in Table 27; in addition to E. torquata, only one
additional species in this Table, E. annulicornis, has strongly
moniliform articulations in the ceratostyles. The two species
have been compared above in the discussion of E. annulicornis.
Eunice torquata has been widely reported from the Mediterranean
Sea and adjacent areas.
191. Eunice torresiensis Mclntosh, 1885
FIGURE 109g-j; TABLES 15,46,47
Eunice torresiensis Mclntosh, 1885:270-272, figs. 32, 33, pi. 37: figs. 18-21,
pi. 19A: figs. 12, 13 [in part].—Fauchald, 1986:256-258. figs. 67-70.
MATERIAL EXAMINED.—Four of the original 6 syntypes,
British Museum (Natural History) ZK 1885.1.12.193, Challenger
sta 186, Torres Strait, 10°30'S, 142°18'E, 15 m, coral
sand.
COMMENTS ON MATERIAL EXAMINED.—TWO additional
syntypes were assigned to E. tribranchiata by Fauchald (1986,
see below). The remaining material consists of a large and a
small specimen; the large specimen is described in detail
below; the small specimen, illustrated by Mclntosh, consists of
16 setigers and has been cut, presumably from a much longer
specimen; the remainder is now missing.
DESCRIPTION.—Large syntype complete with 72 setigers;
total length 47 mm; maximal width 3 mm at setiger 10; length
through setiger 10,6.5 mm. Anterior body with highly convex
dorsum and flattened ventrum, becoming circular in crosssection
in mid body and dorsoventrally flattened posteriorly,
abruptly tapering anteriorly, slowly tapering posteriorly.
Prostomium (Figure 109g) distinctly shorter and narrower
than peristomium, as deep as l /i of peristomium. Prostomial
lobes frontally rounded, dorsally inflated, well separated
medially. Reddish eyes between bases of A-I and A-II.
Antennae in a straight line, with A-I isolated by a gap, similar
in thickness. Ceratophores long in all antennae, without
articulations. Ceratostyles tapering, strongly articulated; distal
articulations distinctly moniliform; maximal number of articulations
about 30 in A-III. A-I to setiger 1; A-II to setiger 7; A-III
to setiger 9. Peristomium about as wide as anterior part of body.
Separation between rings very indistinct, noticeable only
ventrally and at cirral bases; anterior ring nearly 3 /A of total
peristomial length. Peristomial cirri to front edge of the
peristomium, slender, with -12 articulations.
Maxillary formula (rewritten from Mclntosh, 1885:271, fig.
32) 1+1, 4+3, 6+0, 5-6+8, 1+1.
Branchiae present, pectinate, distinctly longer than notopodial
cirri, distinctly reduced in mid-body region (Figure 109j),
flexible. Branchiae from setiger 5 to setiger 70. Branchiae
present to near posterior end, present on more than 65% of total
number of setigers. First branchiae single filaments; all other
branchiae with at least 2 filaments; maximum 7 filaments by
setiger 15; thereafter number decreasing to 3; this number