A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 287
articulations. Grube referred the species, incorrectly, to E.
vittata. The latter lacks branchiae on the posterior half of the
body.
Grube suggested that E. rissoi might be the same as E.
rubrocincta Ehlers; the branchial distribution certainly is closer
to the latter than it is to E. vittata. However, Grube's suggestion
is certainly not adequate to propose a synonymy.
The information available is insufficient to characterize E.
rissoi and it is here considered indeterminable.
168. Eunice rosaurae Monro, 1939
FIGURE 96i-p; TABLES 24,25.52,53
Eunice rosaurae Monro. 1939:351-352, fig. 282 a-f [in part].
MATERIAL EXAMINED.—Two syntypcs, ZK 1941.1.1.217-
221, off St. George, Grenada, 12°05'N, 61°49'W, 720-800 m,
27 Nov 1937, trawled, Rosaura Expedition, Atlantic, 1937-38,
sta34.
COMMENTS ON MATERIAL EXAMINED.—Two of the three
original syntypes fit the species as described by Monro; the
third syntype belongs to E. collini and is treated above. Of the
two syntypes, one had been dissected and the jaws were
separated; it agrees with the specimen described in detail by
Monro and forms the base of the description given below.
DESCRIPTION.—One syntype complete with 142 setigers;
total length 152 mm; maximal width 4 mm; length through
setiger 10, 18 mm. Other syntype nearly complete with 138
setigers; length 170 mm; maximal width 4 mm; length through
setiger 10, 18 mm.
Prostomium (Figure 96i) distinctly shorter and narrower than
peristomium, as deep as ! /2 of peristomium. Prostomial lobes
frontally obliquely truncate, dorsally somewhat flattened;
median sulcus deep. Eyes between bases of A-I and A-II, black.
Antennae in a horseshoe, evenly spaced, similar in thickness.
Ccratophores ring-shaped in all antennae, without articulations.
Ceratostyles medially inflated; inner half without articulations;
outer half of ceratostyles increasingly articulated; outer
articulations distinctly moniliform; maximum 13 articulations
in A-III. A-I to posterior margin of peristomium; A-II to setiger
3; A-III to setiger 3, but slightly longer than A-II. Peristomium
cylindrical. Separation between rings distinct dorsally only;
anterior ring 3 /4 of total peristomial length. Peristomial cirri to
front edge of posterior peristomial ring, medially inflated,
without articulations.
Maxillary formula 1+1, 6+6, 8+0, 5+5, and 1+1.
Branchiae (Figure 96j) present, single filaments, distinctly
shorter than notopodial cirri, not reduced in mid-body region.
Branchiae from setiger 3 to setiger 48-55. Branchiae terminating
well before posterior end, present on less than 55% of total
number of setigers. First and last 10 branchiae small tubercles.
All other branchiae single, slender filaments.
Anterior neuropodial acicular lobes distally truncate with
aciculae emerging near upper corner of lobes. Posterior acicular
lobes distally triangularly rounded with both aciculae emerging
centrally. Anterior and median pre- and postsetal lobes follow
outline of acicular lobes closely. Posterior pre- and postsetal
lobes low, transverse folds. First 5 ventral cirri basically
digitiform, slightly tapering. Ventral cirri basally inflated from
setiger 6 through branchial region. Inflated bases ovate; narrow
tips digitiform. Posterior ventral cirri retaining short, inflated
bases as sausage-shaped thickenings along ventral edge of
parapodia; narrow tips digitiform. Prebranchial notopodial cirri
slender, gently inflated basally; branchial notopodial cirri
somewhat more inflated. Postbranchial notopodial cirri (Figure
96k) slender with distinct separation between cirrophores and
cirrostyles.
Limbate setae slender, marginally obscurely serrated. Pectinate
setae (Figure 961,o) tapering, flaL One marginal tooth
distinctly longer than other teeth; -10 teeth present. Shafts of
compound falcigers (Figure 96m) distally tapering, marginally
serrated. Appendages short, bidentate. Proximal teeth smaller
than distal teeth, very short, tapering, curved laterally. Distal
teeth gently curved, slender. Guards bluntly pointed, marginally
serrated; mucros absent. Pseudocompound falcigers and
compound spinigers absent. Aciculae mostly paired, single in
anterior setigers, with black cores and clear sheaths, distally
tapering, gently curved (Figure 96n). Subacicular hooks
(Figure 96p) with black cores and clear sheaths, sometimes
including all teeth; some hooks distally tridentate with 2 large
distal teeth in tandem and small, nearly clear proximal teeth. In
other hooks distal teeth fused, so hooks apparently bidentate.
Bidentate hooks in full lateral view identical in appearance to
tridentate ones, with both teeth pointing distally. Hooks first
present from setiger 38 (32 in the other specimen), present in all
setigers, always single (except for replacements).
be-
UNKNOWN MORPHOLOGICAL FEATURES.—Relationship
tween Mx III and left Mx IV; pygidium and anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 34, 39-42, 56, 60.
Unknown Characters: 4, 6.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Eunice rosaurae is listed with similar species in
Tables 24 and 25. It resembles two additional species in Table
25 in having short branchiae consisting of single strap-like
filaments. These two species, E. gravieri and E. nicidioformis,
have exclusively bidentate subacicular hooks. Tridentate
subacicular hooks with the teeth in tandem present in some
neuropodia have not been found in any other species in group
Bl. A total of four species are known to have the distal teeth in
tandem in the genus; these are listed in Tables 52 and 53. Two
of these have light yellow aciculae and subacicular hooks. The
only other species with dark aciculae and subacicular hooks is
E. cirrobranchiata. All aciculae are pointed in E. rosaurae: the
aciculae are in part hammer-headed in E. cirrobranchiata.