A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 329
superior aciculae light brown; all aciculae distally geniculate
(Figure 112h,o), expanded into small, flattened tabs; crosssections
of shafts round. Subacicular hooks (Figure 112g)
slender, bidentate, with black cores and clear sheaths. Hooks
first present from setiger 29 (32 in paralectotype), present in all
setigers thereafter, always single (except for replacements).
Hooks tapering, straight. Proximal teeth tapering, directed
laterally; distal teeth smaller than proximal teeth, slender,
tapering, directed obliquely laterally.
UNKNOWN MORPHOLOGICAL FEATURES.—Pygidium and
anal cirri.
EXPECTED STATES OF SELECTED MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 22, 56, 60. Unknown
Characters: 1,2,4,6, 36-40,47, 50, 63, 74, 78.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—37,1;
38,1.
REMARKS.—The smaller specimen differs from the specimens
described above in the following features:
Branchiae (Figure 112n) single filaments, rather than
pectinate with up to 4 filaments.
Distal end of inflated ventral cirri relatively much larger than
in larger specimens.
Pectinate setae (Figure 112o) with one marginal tooth longer
than other in small specimen. Median pectinate setae distinctly
furled in small specimen. Shafts of both compound spinigers
and falcigers (Figure 112j,k) with very large distal beaks; shafts
of falcigers (Figure 112k) serrated as is margin of guards.
Falcigers present already from about setiger 5 in small
specimens and not until about setiger 15 in larger specimens.
Subacicular hooks (Figure 112o) distinctly beaked with large
head and parrot-beaked teeth.
These differences, and the differences Crossland claimed for
the specimens described above and the adult specimens he
described in the first pages of the description, are the kind of
differences that may be related to the size of the specimen, but
may also be of specific value under certain circumstances. The
species is clearly valid, but without access to large adults from
the type areas, preferably from Zanzibar, it is going to be
difficult to assess the relations among the three different forms
Crossland included in his description.
The relationship between E. tubifex and the closely similar E.
tubicola is explored above; the two described forms may in fact
belong to a single widespread species, but without knowledge
of variability with increasing size, this problem cannot be
solved.
196. Eunice unidentata Rioja, 1962
TABLES 27,28, 50
Eunice unidentata Rioja, 1962:175-178, figs. 77-83.
COMMENTS ON MATERIAL.—Rioja
did not leave any
material of this or any of the other species he described from
Mexico (Maria Elena Caso and Vivianne Solis Weiss, in litt.).
The following description summarizes what is known about
this species based on his description and illustrations.
DESCRIPTION.—Specimens 80-100 mm long and 2-3 mm
wide.
Prostomium distinctly shorter than peristomium, about as
wide as peristomium. Prostomial lobes frontally rounded;
median groove shallow. Small eyes hidden below peristomial
fold. Antennae in a horseshoe, evenly spaced, similar in
thickness. Ceratophores long in all antennae, with 4 to 5
distinct, short articulations. Ceratostyles slender and tapering,
not articulated. All antennae short; not outreaching peristomium;
A-III longest, A-II slightly shorter and A-I shortest.
Peristomium cylindrical. Separation between rings distinct at
least dorsally. Peristomial cirri tapering, short, without articulations.
Maxillary formula unknown.
Branchiae present, pectinate, distinctly longer than notopodial
cirri, not reduced in mid-body region, erect. Branchiae
from setiger 23 absent on last x h or 7* of body. Branchiae
terminating well before posterior end, present on less than 55%
of total number of setigers. Maximum 5 filaments reached at
about setiger 35 and lasting through setiger 70. Filaments long,
digitiform.
Parapodial features not described in detail by Rioja. Median
parapodium (Rioja, 1962, fig. 78) with truncate, possibly
slightly excavate neuropodial acicular lobes; aciculae emerging
at midline. Presetal and possibly postsetal lobes low, transverse
folds. Ventral cirri basally inflated with large, thick, tapering
tips in median parapodia. Notopodial cirri tapering, without
articulations.
Pectinate setae flat, flaring. One marginal tooth longer than
other teeth; -17 teeth present Shafts of compound falcigers
inflated, marginally smooth. Appendages short and triangular
with very large heads, bidentate. Proximal teeth triangular and
directed laterally. Distal teeth of about same size as proximal
teeth, curved. Guards symmetrically rounded, mucros absent.
Pseudocompound falcigers and compound spinigers absent
Aciculae with dark (black) cores and clear sheaths, distally
straight, bluntly pointed; cross-sections round. Subacicular
hooks with dark cores and clear sheaths, distally tapering,
unidentate. Hooks first present from setigers 20-25.
UNKNOWN MORPHOLOGICAL FEATURES.—Many prostomial
and peristomial features; jaw structure; many parapodial
features; pygidium and anal cirri.
EXPECTED STATES OF SELECTED UNKNOWN FEATURES.—
None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 22, 56. Unknown
Characters: 1, 4-6, 8, 12, 14, 24-26, 36, 39, 40, 45, 47, 48,
50-52,57-61,63,64,81,82.
ASSUMED STATES FOR PURPOSE OF PREPARING
None.
KEY.—