A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 325
from setiger 5 through setiger 25. Inflated bases nearly
spherical; narrow tips tapering, broadly conical. Postbranchial
ventral cirri increasingly digitiform, gradually loosing basal
inflation. Prebranchial and early branchial notopodial cirri
medially inflated, about half as long as peristomial cirri,
becoming basally distinctly inflated, abruptly tapering with
long, digitiform tips in most of branchial region. Postbranchial
notopodial cirri medially inflated, similar in shape to prebranchial
cirri but shorter. Notopodial cirri without articulations.
Limbate setae slender, nearly capillary. Pectinate setae
(Figure 110k) flat, flaring, with thick shafts. One marginal
tooth longer than other teeth; -15 teeth present. Shafts of
compound falcigers (Figure HOh) have thick, smoothly
tapering, without marginal dentition. Appendages very small,
slender, with indistinct head, bidentate. Proximal teeth triangular,
directed laterally. Distal teeth much smaller than proximal
teeth, nearly erect Guards symmetrically bluntly pointed;
mucros absent. Pseudocompound falcigers and compound
spinigers absent. Aciculae (Figure HOg) paired, yellow,
distally bent ventrally, abruptly tapering; cross-sections round.
Separation between core and sheath indistinct in both aciculae
and subacicular hooks. Subacicular hooks (Figure 1101)
yellow, bidentate. Hooks first present from setiger 51, irregular
in occurrence, always single (except for replacements). Hooks
distally abruptly tapered, with small head; both teeth directed
obliquely distally; proximal and distal teeth similar in length;
proximal teeth slender and tapering; distal teeth massive and
blunt.
UNKNOWN MORPHOLOGICAL FEATURES.—Jaw structure;
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: 13, 14.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Eunice tridentata is compared to similar species
in Tables 19 and 21. Perhaps the most unusual feature of
this species is that the branchiae first reach their maximum
number of filaments at about setiger 30; in all other species in
Table 21, the maximum number of filaments is reached at
setiger 15, with the exception of E. heterochaeta, in which it is
reached at setiger 25. The notopodial cirri are articulated in the
anterior end in E. heterochaeta and wholly lack articulations in
E. tridentata.
Eunice tristriata Grube, 1870
Eunice tristriata Grube, 1870b:55; 1878a: 100.
REMARKS.—No specimens are available. The prostomial
antennae are very indistinctly articulated; the median one
reaches setiger 5. Branchiae are present from setiger 5 and are
absent on the last 22 setigers; the maximum number of
filaments is 10. The branchiae do not outreach the "remarkable
thick" notopodial cirrus.
The species must be considered indeterminable.
194. Eunice tubicola (Treadwell, 1922)
FIGURE 111; TABLES 52, 53
Leodice tubicola Treadwell. 1922:139-142, figs. 17-23, pi. 3: figs. 1-6.
Eunice tubifex.—Hartman, 1956:282-283 [in part, not Eunice tubifex
Crossland, 1904].
MATERIAL EXAMINED.—Holotype, AMNH 1540, Pago
Pago, Samoa, 1920.
COMMENTS ON MATERIAL EXAMINED.—The anterior end
had been dissected and the jaws are now missing. The lower lip
had been sliced off, so the illustration is partly a reconstruction
(below the dashed line indicated in the illustration). Remnants
of a stiff horny tube was also present in sample, as were two
fragments of another specimen, apparently of the same species.
DESCRIPTION.—Holotype complete, with 83 setigers; total
length 26.5 mm; maximal width 1.2 mm at about setiger 10;
length through setiger 10,4.0 mm.
Prostomium (Figure Ilia) distinctly shorter and narrower
than peristomium, less than x li as deep as peristomium.
Prostomial lobes frontally rounded, dorsally flattened; median
groove shallow. Eyes not observed. Antennae in a horseshoe,
evenly spaced, similar in thickness. Ceratophores ring-shaped
in all antennae, without articulations. Ceratostyles digitiform,
without articulations. All antennae similar in length, none
reaching beyond anterior peristomial ring. Peristomium cylindrical.
Separation between rings distinct dorsally and ventrally;
anterior ring - 4 /s of total peristomial length. Peristomial cirri
digitiform, without articulations, barely reaching middle of
anterior peristomial ring.
Jaws missing.
Branchiae (Figure llle) present; single filaments, about as
long as notopodial cirri. Branchiae from setiger 22 on one side
and 24 on other side to setiger 69. Branchiae terminating well
before posterior end, present on more than 65% of total number
of setigers. All branchiae digitiform filaments, about as long as
notopodial cirri.
Anterior neuropodial acicular lobes (Figure 11 lb) obliquely
truncate with small, rounded tabs above aciculae; aciculae
emerging at midline. Median and posterior neuropodial
acicular lobes nearly triangular with straight dorsal and distal
edges. Pre- and postsetal lobes low, transverse folds. First 5
ventral cirri digitiform, thereafter basally strongly inflated,
through rest of body. Inflated bases thick, transverse welts;
narrow tips short and button-shaped. Anterior notopodial cirri
medially inflated, becoming digitiform in posterior setigers, but
retaining same length as in anterior setigers. Notopodial cirri
without articulations.
Limbate setae marginally serrated. Pectinate setae small