A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 291
antennae, without articulations. Ceratostyles relatively stout
and digitiform, with up to 7 moniliform articulations in A-II;
innermost articulations half length of each antenna. Antennae
reaching middle of peristomium. Peristomium cylindrical,
more than twice as long as prostomium. Separation between
rings distinct dorsally and laterally, indistinct ventrally;
anterior ring 3 A of total peristomial length. Peristomial cirri to
about middle of peristomium, tapering, with 3 articulations.
Jaws now missing. Maxillary formula 1+1, 5+6, 6+0, 6+7,
and 1+1 according to Knox.
Branchiae present, palmate, distinctly longer than notopodial
cirri, not reduced in mid-body region. Branchiae from setiger 5
to end of fragment. Where best developed, between sctigers 7
and 29, branchiae with 2 short, thick filaments; otherwise all
branchiae with single filaments (Figure 98e).
Anterior ncuropodial acicular lobes very short, distally
truncate; aciculae emerging at midline. Pre- and postsetal lobes
low, transverse folds. First 7 ventral cirri thick, tapering.
Ventral cirri basally from setiger 8 through setiger 27. Inflated
bases ovate; narrow tips tapering. Posterior ventral cirri large;
open scoops covering emergent parts of subacicular hooks.
Anterior notopodial cirri thick and medially inflated, with 3
articulations. Notopodial cirri retaining same size in all
segments present, becoming digitiform by setiger 20, without
articulations.
Pectinate setae (Figure 98b) tapering, flat. Both marginal
teeth slightly longer than other teeth; -12 teeth present. Shafts
of compound falcigers (Figure 98d) tapering, marginally finely
dentate. Appendage short, rather wide, bidentate. Both teeth
similar in size, short and blunt Guards bluntly truncate,
marginally serrated; mucros absent. Pseudocompound falcigers
and compound spinigers absent. Aciculae paired in median and
posterior parapodia, black, very thick, tapering, bent dorsally;
cross-sections round. Subacicular hooks (Figure 98c) black,
bidentate. Hooks first present from setiger 28, present in all
setigers thereafter, always single (except for replacements).
Hooks curved, with large head. Proximal teeth larger than distal
teeth, triangular, directed laterally. Distal teeth directed
dorsally.
UNKNOWN MORPHOLOGICAL FEATURES.—Relationship between
Mx III and left Mx IV; some features associated with
posterior setigers; pygidium and anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 34, 56, 58, 59. Unknown
Characters: 1, 2,4, 6, 36-38,40, 74, 78.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—37,1;
38,1.
REMARKS.—Eunice rubella differs from most other species
with black, bidentate subacicular hooks by having very
strongly beaded ceratostyles and by the poor development of
branchiae. It is listed with similar species in Tables 27 and 32;
it is the only species in Table 32 with the separation between
peristomial rings visible only dorsally; in all other species the
separation is visible also ventrally.
Branchiae were present to setiger 80 according to Knox; the
distribution on the fragments present agrees with this pattern.
Eunice rubra Grube, 1856:59.
171. Eunice rubra Grube, 1856
FIGURE 98f-s; TABLES 46,47
MATERIAL EXAMINED.—Holotype, ZMC, St. Thomas, West
Indies, coll. A.S. Orsted and H. Krdyer.
DESCRIPTION.—Holotype nearly complete with 118 setigers;
length 177 mm; maximal width 3 mm; length through setiger
10, 7.5 mm.
Prostomium (Figure 980 about as long as peristomium,
distinctly narrower than peristomium, as deep as x h- of the
peristomium. Prostomial lobes forming blunt 3-sided pyramid,
frontally obliquely truncate, dorsally flattened; median sulcus
shallow. Palpal region marked off by shallow horizontal
groove. Eyes between bases of A-I and A-II. Antennae in a
horseshoe, evenly spaced, similar in thickness. Ceratophores
ring-shaped in all antennae, without articulations. Ceratostyles
digitiform, with up to 23 moniliform articulations in (apparently
incomplete) A-III. A-I to middle of anterior peristomial
ring. Longest A-II to setiger 1; incomplete A-III to setiger 3.
Peristomium cylindrical. Separation between rings distinct
dorsally and ventrally; anterior ring 3 /4 of total peristomial
length. Peristomial cirri to middle of anterior peristomial ring,
slender and tapering, with 10 cylindrical articulations.
Jaws not examined.
Branchiae (Figure 98i,j,s) present, pectinate, distinctly
longer than notopodial cirri, not reduced in mid-body region,
erect. Branchiae from setiger 4 to end of fragment (-15 setigers
missing). First branchia with 2 filaments; all other branchiae
strongly pectinate with at least 6 filaments. Maximum
filaments 21 at about setiger 15. Number of filaments reduced
to 6 by setiger 40; this number retained in rest of specimen. No
increase in number of filaments towards posterior end, but a
slight increase in length of filaments present.
All neuropodial acicular lobes distally rounded; aciculae
emerging at midline. All pre- and postsetal lobes low,
transverse folds. Presetal lobes distinctly shorter than acicular
lobes in anterior and median setigers, following outline of
acicular lobes closely in posterior setigers. First 3 ventral cirri
thick and tapering. Ventral cirri basally inflated from about
setiger 4 through setiger 40. Inflated bases ovate; narrow tips
tapering. Posterior ventral cirri increasingly digitiform, about
half as long as notopodial cirri in median and posterior setigers.
All notopodial cirri tapering from slightly inflated bases.
Anterior notopodial cirri with up to 6 articulations; median and
posterior notopodial cirri with 3 to 4 articulations.
Limbate setae slender, marginally serrated. Pectinate setae
(Figure 98g,l,o) tapering, flat. One marginal tooth distinctly