A Review of the Genus Eunice - Smithsonian Institution Libraries

258 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
COMMENTS ON MATERIAL EXAMINED.—The holotype has
been deeply dissected frontally; the illustration of the anterior
end is a partial reconstruction, especially of the outline of the
lower lip.
DESCRIPTION.—Holotype incomplete female with 97 setigers;
length 42 mm; maximal width 5.5 mm; length through
setiger 10, 6 mm.
Prostomium (Figure 85d) distinctly shorter and narrower
than peristomium, less than 1 /2 as deep as peristomium.
Prostomial lobes frontally rounded, dorsally inflated; median
sulcus deep. Eyes not observed. Bases of antennae hidden
below peristomial fold. Antennae in a horseshoe, evenly
spaced, with A-III considerably heavier than other 4. Ceratophores
ring-shaped in all antennae, without articulations.
Ceratostyles tapering, A-I and A-II with 3 or 4 long cylindrical
articulations along distal half. A-I to posterior peristomial ring;
A-II to setiger 8; A-III incomplete. Peristomium cylindrical.
Separation between rings distinct dorsally and ventrally;
anterior ring 3 A of total peristomial length. Peristomial cirri to
middle of anterior peristomial ring, without articulations.
Maxillary formula 1+1, 7+7, 8+0, +8,1+1. Mx III long and
located immediately behind left Mx II. Left Mx IV missing.
Branchiae (Figure 85e) present, pectinate, distinctly shorter
than notopodial cirri, not reduced in mid-body region, flexible.
Branchiae from setiger 8 to end of fragment. First branchiae
single filaments; maximum 5 filaments at setiger 15; most
segments with 3 or 4 filaments; some with 5 even in last
segments present. Branchial stems short, tapering. Filaments
digitiform.
Neuropodial acicular lobes distally rounded or truncate;
aciculae emerging at midline. Pre- and postsetal lobes low,
transverse folds. First 4 ventral cirri thick, tapering. Ventral
cirri basally inflated from setiger 5. Inflated bases ovate;
narrow tips digitiform. Inflated bases reduced from about
setiger 50. By setiger 70-75 ventral cirri short, slender and
digitiform. All notopodial cirri prominent, basally inflated,
tapering to blunt tips, without articulations.
Pectinate setae (Figure 85h) tapering, flat. One marginal
tooth slightly longer than other teeth; -12 teeth present. Shafts
of compound falcigers (Figure 85f) tapering, marginally
smooth. Appendages large, with distinct heads, bidentate.
Proximal teeth larger than distal teeth, triangular, directed
laterally. Distal teeth curved. Guards distally rounded, margin
smooth, mucros absent. Pseudocompound falcigers and compound
spinigers absent. Aciculae (Figure 85g) paired, dark,
sharply pointed, straight or gently curved; cross-section round.
Subacicular hooks (Figure 85i) dark, bidentate. Hooks first
present from setiger 27, present in all setigers thereafter, always
single (except for replacements). Hooks slender, tapering.
Proximal teeth about twice as large as distal teeth. Both teeth
directed distally.
UNKNOWN MORPHOLOGICAL FEATURES.—All characters
associated with far posterior setigers, 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, 13, 14, 23, 36-38,40, 74, 78.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—37,1;
38,1.
REMARKS.—Eunice pauroneurata is listed with similar
species in Tables 27 and 31. The shape of the appendages of the
compound hooks resembles the condition in E. collini, but the
two species can be separated on the structure of the antennae
and aciculae. Two additional species in Table 31 may have
short, flexible branchiae. In E. bipapillata the flexibility was
not noted, so it is here assumed present for the purpose
of the discussion; in this species, branchiae arc first present
from setiger 4 with a maximum of seven filaments; in E.
pulvinopalpata branchiae arc present from sctigcr 3 with a
maximum of 25 filaments. In E. pauroneurata branchiae are
first present from scligcr 8 with a maximum of five filaments.
Chambcrlin (1919a:253) claimed that the unpaired Mx III
was missing; this is incorrect: Mx III is present, but left Mx IV
is missing.
150. Eunice pectinata Grube, 1869
FIGURE 86«-C; TABLES 19, 20
Eunice pectinate Gnibe. 1869:492-493.
MATERIAL EXAMINED.—Holotype, ZMB F 2005, Tor, Red
Sea, coll. Ehrenberg.
COMMENTS ON MATERIAL EXAMINED.—A note on the label
translates as: "according to Grube's original label = E. pennata
O.F. Muller."
DESCRIPTION.—Holotype incomplete with 51 setigers;
length 27 mm; maximal width 2 mm; length through setiger 10,
6 mm. Body cylindrical.
Prostomium (Figure 86a) distinctly shorter and narrower
than peristomium, less than x li as deep as peristomium.
Prostomial lobes large, frontally rounded; median sulcus deep.
Eyes posterior to A-I, faded. Antennae in a horseshoe, evenly
spaced, similar in thickness. Ceratophores ring-shaped in all
antennae, without articulations. Ceratostyles tapering, with up
to 12 closely spaced, short, articulations. Articulations cylindrical
basally, becoming drop-shaped distally. A-I to posterior
peristomial ring; A-II to setiger 2; A-III to setiger 3.
Peristomium cylindrical; lower lip thick, forming ventral
cushion. Separation between rings distinct on all sides; anterior
ring ~ 3 /4 of total peristomial length. Peristomial cirri to middle
of anterior peristomial ring, digitiform, with 6 articulations.
Maxillary formula 1+1, 5+5, 6+0, 4+8, 1+1. Jaws very soft
and friable. Mx III form part of distal arc with left Mx IV.
Branchiae (Figure 86b) present, pectinate, distinctly longer
than notopodial cirri, not reduced in mid-body region, flexible.
Branchiae from setiger 5 to end of fragment. First 2 pairs single
filaments; maximum 10 filaments; even last setigers with 5