A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 111
which are similar to E. afra in that they have dark subacicular
hooks and branchiae starting at a relatively late segment.
Eunice collaris is listed with similar species in Tables 33 and
35. It is one of two species in Table 35 with more than six
branchial filaments: Eunice collaris has 12 filaments and E.
fauveli has 14 filaments. The latter has mucronate guards in the
compound falcigers; E. collaris has blunt guards.
44. Eunice collini Augener, 1906
FIGURE 34a-k; TABLES 33, 37-39
Eunice collini Augener, 1906:133-135, pl.4: figs. 66-73.
Eunice rosaurae Monro, 1939:351-352, fig.28a-f [in part].
MATERIAL EXAMINED.—Holotype, MCZ 2011, Blake sta
288, off Barbados, 730 m. One syntype of E. rosaurae,
BM(NH) 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, 1937-1938, sta 34.
DESCRIPTION.—Holotype of E. collini incomplete with 94
setigers; length 45 mm; maximal width 4 mm at about setiger
15; length through sctigcr 10, 7 mm. Syntype of E. rosaurae
complete with 76 setigers; total length 42 mm; maximal width
5 mm at about setiger 15; length through setiger 10, 9 mm.
Body anteriorly inflated; posterior end wide and dorsoventraily
flattened; anterior and posterior ends abruptly tapered.
Prostomium (Figure 34a,e) distinctly shorter and narrower
than peristomium, as deep as l /2 of the peristomium. Prostomial
lobes frontally rounded, dorsally inflated; median sulcus very
deep. Eyes absent. Antennae in a horseshoe, evenly spaced,
similar in thickness. Ceratophores ring-shaped in all antennae,
without articulations. Ceratostyles tapering, without articulations,
smooth or irregularly wrinkled. A-I to second peristomial
ring; A-I I to setiger 2; A-I 11 incomplete in both specimens.
Peristomium flaring anteriorly. Separation between rings
distinct dorsally and ventrally; anterior ring ~ 3 A of total
peristomial length. Peristomial cirri to front margin of
peristomium, slender and digitiform, without articulations.
Jaws not examined.
Branchiae (Figure 34k) present, palmate, distinctly shorter
than notopodial cirri, not reduced in mid-body region, erect.
Branchiae from setiger 16 to setiger 85 in holotype; from
setiger 12 to setiger 70 in syntype of E. rosaurae. Branchiae
terminating well before posterior end. Most branchiae short,
thick, single filaments; scattered along branchiated region,
especially posteriorly, short, nearly tubercular second filaments
present.
All neuropodial acicular lobes truncate or gently rounded;
aciculae emerging at midline. All pre- and postsetal lobes low,
transverse folds. Anterior ventral cirri thick and tapering.
Ventral cirri basally inflated from setiger 5. Inflated bases
ovate, narrow tips tapering. Inflated bases reduced from about
setiger 50; free tips elongating and becoming digitiform
(Figure 34d). In far posterior setigers ventral cirri about twice
as long as notopodial cirri but otherwise similar (Figure 34k).
Anterior notopodial cirri basally inflated, distally slender;
posterior notopodial cirri similar in shape but somewhat longer,
without articulations.
Limbate setae slender, margins smooth. Shafts of pectinate
setae slender (Figure 34f); blades distinctly flaring, fiat. One
marginal tooth slightly longer than other teeth; about 10 teeth
present. Shafts of compound falcigers (Figure 34c,i) tapering
from wide distal end; margins smooth. Appendages thick,
tapering; heads distinct, bidentate. Proximal teeth about twice
as large as distal teeth, directed laterally; distal teeth nearly
erect or gently curved, tapering. Guards symmetrically
rounded; cutting edge frayed rather than serrated; mucros
absent. Pseudocompound falcigers and compound spinigers
absent. Aciculae single in anterior parapodia, paired in all
median and posterior parapodia. Superior aciculae (Figure 34h)
with knife-shaped cross-section, light to dark brown, distally
pointed. Inferior aciculae (Figure 34g) with round crosssection,
distally tapering to straight tips, dark brown to
jet-black. Both aciculae projecting (Figure 34d,k), for nearly
half their length in median and posterior setigers, nearly half
width of body represented by projecting aciculae in far
posterior setigers. Posterior notopodial cirri supported by
internal black aciculae; notopodial aciculae absent in anterior
setigers. Subacicular hooks (Figure b, j) black, bidentate. Hooks
first present from setiger 26-27, present in all setigers
thereafter, always single (except for replacements). Hooks
tapering, with distinct heads; proximal teeth much larger than
distal teeth, directed laterally; distal teeth directed distally.
Thin, pergamentaceous tube associated with syntype of E.
rosaurae.
UNKNOWN MORPHOLOGICAL FEATURES.—Jaw structure;
pygidium and anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—Mx III short, forming distal arc with left Mx IV.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 14, 22, 56, 58, 59.
Unknown Characters: 1, 2, 6, 23, 38-40,42, 74, 78.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—38,2.
REMARKS.—Eunice collini resembles E. floridana, but can
be separated on the structure of the aciculae and the late start of
the branchiae. Branchiae are present from setigers 7-10 in E.
floridana and from setiger 12 or not until setiger 16 in E. collini.
The differences between the syntype of E. rosaurae and the
holotype of E. collini are minor; some may be due to the state
of preservation, such as the projecting aciculae in the former,
and other differences are well within the normal variability
encountered in the genus.
Eunice collini is listed with similar species in Tables 33 and
in Tables 37-39. It is one of the few species in Table 33 in
which the branchiae terminate well before the posterior end.