A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 261
colored, tridentate with teeth in a crest. Hooks from setiger 63,
scattered in next 10-15 setigers, in all neuropodia in posterior
setigers, always single (except for replacements). Hooks
slender, tapering, with distinct heads. Proximal fangs large,
curved. Two smaller fangs in crests.
UNKNOWN MORPHOLOGICAL FEATURES.—Several prostomial
features; 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: 4,6,10-12, 15-17,24, 70, 74, 78.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Eunice pelamidis has remained unreported
since it was first described. The species is characterized by
having pseudocompound falcigers in the posterior end as does
E. afuerensis. In E. afuerensis the articulations of the
ceratostyles are drop-shaped or moniliform distally only; in E.
pelamidis the articulations are moniliform throughout. Peristomial
cirri are articulated in E. pelamidis and lack articulations
in E. afuerensis. The two species are listed in Tables 52 and 53.
152. Eunice pellucida Kinberg, 1865
FIGURE 87a-f; TABLES 41,44
Eunice pellucida Kinberg, 1865:562.
Eunice vitlata.—Hartman, 1948:77 [in part, not Nereis vittata Chiaje, 1828].
MATERIAL EXAMINED.—Two syntypes, RM Typ 433, St.
Thomas, West Indies, coll. Werngren. Kinberg (1865:562)
gave locality information as "St. Thomas, fundo 10-12
orgyiarum, unde retulit Verngren."
COMMENTS ON MATERIAL EXAMINED.—The type lot consists
of two rather poorly preserved anterior ends and a long
posterior end, which may be part of the longer of the two
syntypes. The shorter anterior end has been dissected ventrally.
DESCRIPTION.—One syntype with 35 anterior setigers. Other
syntype with 58 anterior setigers; length 22 mm; maximal
width 2 mm wide; length through setiger 10, 3.5 mm. Posterior
fragment with 60 setigers; length 32 mm.
Prostomium (Figure 87a) distinctly shorter and narrower
than peristomium, as deep as x li of peristomium. Prostomial
lobes frontally rounded, dorsally inflated; median sulcus
shallow. Eyes absent. Antennae in a horseshoe, evenly spaced,
similar in thickness. Ceratophores ring-shaped in all antennae,
without articulations. Ceratostyles digitiform, with up to 30
moniliform articulations in A-III in short syntype; 20 articulations
in A-III in long syntype. A-I to setiger 2; A-II to setiger 5;
A-III to setiger 11. Peristomium cylindrical. Separation
between rings distinct dorsally and ventrally; anterior ring 4 /5 of
total peristomial length. Peristomial cirri to posterior edge of
prostomium, with 3 articulations.
Maxillary formula 1+1, 7+7, 6+0, 7+10, and 1+1. Mx III
long, located behind left Mx II. All jaws currently very soft.
Branchiae present, pectinate, not reduced in mid-body
region, erect. Branchiae from setiger 5 to setiger 28 on long
syntype; on other syntype branchiae from setiger 6 and present
to last segment with 2 very short filaments, corresponding in
size to branchiae on last branchial segments in other syntype.
Branchiae terminating well before posterior end, present on less
than 55% of total number of setigers. Maximally 8 filaments.
Branchial stems erect. Filaments slender. Posterior fragment
entirely abranchiate.
Anterior neuropodial acicular lobes truncate; median and
posterior acicular lobes (Figure 87f) distally rounded; aciculae
emerging at midline. Pre- and postsetal lobes low, transverse
folds. First 4 ventral cirri thick, tapering. Ventral cirri basally
inflated from setiger 5 through about setiger 30. Inflated bases
ovate; narrow tips digitiform. From about setiger 45 ventral
cirri long, slender and digitiform, increasing in relative length
posteriorly. Anterior notopodial cirri medially inflated, becoming
digitiform in posterior setigers, retaining same absolute
length, thus much more dominant in posterior than in anterior
setigers. Notopodial cirri without articulations.
Limbate setae marginally serrated. Pectinate setae (Figure
87d) tapering, flat Both marginal teeth slightly longer than
other teeth; 12 teeth present. Shafts of compound falcigers
(Figure 87e) distally inflated. Appendages short, slender; heads
large, bidentate. Proximal teeth triangular, directed laterally.
Distal teeth curved. Guards asymmetrically bluntly pointed,
marginally serrated; mucros absent. Pseudocompound falcigers
and compound spinigers absent. Aciculae (Figure 87b) paired,
yellow, distally hammer-headed, nearly bifid in some segments.
Separation between cores and sheaths indistinct in both
aciculae and subacicular hooks. Subacicular hooks (Figure 87c)
yellow, tridentate with teeth in a crest. Hooks first present from
setiger 21 or 23, present in all setigers thereafter, always single
(except for replacements). Hooks with large curved main fangs;
distal fangs emerging from joint base, decreasing evenly in
size.
UNKNOWN MORPHOLOGICAL FEATURES.—Features 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: 14, 56, 58, 59. Unknown
Characters: 1,2,4, 6, 32, 39,40,42,47, 50,63.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Eunice pellucida was considered as a possible
synonym of E. vittata by Hartman (1948). It belongs to group
C-l as does E. vittata, but differs clearly from the latter in that
it has hammer-headed aciculae and moniliform antennal
articulations. Eunice vittata has smoothly tapering aciculae and
long, cylindrical antennal articulations. Eunice pellucida is
listed with similar species in Tables 41 and 44. Most species
listed in Table 44 have tapering, pointed aciculae; E.