A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 307
The ceratostyles lack articulations in E. megabranchia; they
have cylindrical articulations to the tip in E. semisegregata and
have distally drop-shaped articulations in E. validobranchiata.
Eunice siciliensis Grube, 1840:83.
Eunice siciliensis Grube, 1840
REMARKS.—Examination of the type material demonstrated
that this species has the jaw structure and setal complement of
the genus Palola.
Eunice simplex Peters. 1854: 611.
Eunice simplex Peters, 1854
REMARKS.—Grube (1878a: 101) referred this species to
Palola (= Eunice) siciliensis under some doubt. There is
nothing in Peters' original description to contradict such a
conclusion. The issue will be further discussed in a review of
the genus Palola.
181. Eunice sonorae Fauchald, 1970
FIGURE 104e-k; TABLES 33, 35, 50.51
Eunice sonorae Fauchald, 1970:45-48, pi. 6: figs. a-g.
MATERIAL EXAMINED.—Holotype, AHF Poly 0283, Puerto
Penasco, Sonora, Mexico, rocky intertidal, 8 Apr 1967, coll. P.
Pickens.
DESCRIPTION.—Holotype complete with 586 setigers; total
length 345 mm; maximal width 6 mm; length through setiger
10, 14 mm. Anterior body cylindrical, tapering slowly, with
numerous, very crowded segments posteriorly. Anal cirri long,
tapering, without articulations.
Prostomium (Figure 104e) distinctly shorter and narrower
than peristomium, as deep as 1 /2 of peristomium. Prostomial
lobes frontally obliquely truncate, dorsally flattened; median
sulcus deep. Eyes behind bases of A-I, black. Antennae in a
horseshoe, evenly spaced, similar in thickness. Ceratophores
long, confluent with prostomium, without articulations. Ceratostyles
slightly tapering, with a maximum of 4 irregular,
cylindrical articulations in A-III. A-I to anterior peristomial
ring; A-II to posterior edge of peristomium; A-III to setiger 1.
Peristomium with very voluminous, muscular lower lip,
otherwise cylindrical. Separation between rings distinct on all
sides; anterior ring 2 h of total peristomial length. Peristomial
cirri to middle of anterior peristomial ring, without articulations.
Jaws not examined.
Branchiae (Figure 104h) present, pectinate, distinctly longer
than notopodial cirri, not reduced in mid-body region, flexible.
Branchiae from setiger 41 to setiger 530. Branchiae terminating
well before posterior end, present on more than 65% of total
number of setigers. First branchia with 2 filaments; maximum
6 filaments from about setiger 65; from about setiger 400
number of filaments decreasing and length of filaments
decreasing rapidly. From setiger 475 branchiae very short,
tapering single filaments decreasing in size posteriorly.
Branchial stem very slender. Filaments very long, slender,
nearly filiform.
Anterior neuropodial acicular lobes (Figure 104f) obliquely
truncate with aciculae emerging near midline. Posterior
acicular lobes symmetrically rounded with aciculae emerging
slightly superior to middle. All presetal lobes low, transverse
folds. Anterior postsetal lobes twice as high as acicular lobes,
symmetrically rounded. Postsetal lobes decreasing in size
posteriorly, retained as short rounded free lobes superior to and
behind acicular lobe in all setigers. First 4 ventral cirri thick and
tapering. Ventral cirri basally inflated from about setiger 5
through rest of body. Inflated bases thick, elongated welts, less
conspicuous posterior to setiger 450; narrow tips tapering.
Anterior notopodial cirri medially inflated; posterior notopodial
cirri tapering from a wide base, retaining about same length
in all setigers. Notopodial cirri without articulations.
Anterior setigers with thick supra-acicular and posterior
fascicles of limbate setae and masses of compound falcigers in
subacicular and anterior positions; pectinate setae absent.
Median and posterior setigers with thinner fascicles of limbate
setae and compound falcigers; pectinate setae present Limbate
setae slender, marginally smooth. Posterior pectinate setae in
large numbers; some pectinate setae (Figure 104i) unusually
large; shafts flattened; blade flat, widely flaring. One marginal
tooth longer than other teeth; -16 teeth present. Shafts of
anterior compound falcigers (Figure 104g) tapering, with
distinct internal striations, marginally smooth, without distal
beak. Appendages slender, slightly tapering, bidentate. Proximal
teeth much smaller than distal teeth, tapering, directed
distally. Distal teeth nearly erect, thick, blunt. Shafts of
posterior compound falcigers (Figure 104j) inflated, without
internal striation, marginally finely serrated; distal beak
present. Appendages shorter than in anterior setigers; heads
distinct, rather large, bidentate. Proximal teeth larger than distal
teeth, triangular, laterally directed. Distal teeth tapering,
directed laterally. Guards symmetrically rounded in all setigers,
smooth-edged in anterior setigers, marginally serrated in
posterior setigers; mucros absent Pseudocompound falcigers
and compound spinigers absent. Notopodial aciculae honeycolored
and especially prominent in posterior setigers. Aciculae
up to 4 in anterior setigers, becoming reduced to 1 in posterior
setigers, with dark brown to black cores and clear sheaths,
tapering to slender, straight tips; cross-sections round. Subacicular
hooks (Figure 104k) with dark brown to black cores and
clear sheaths, tapering to slender single tips. Hooks first present
from setiger 54, present in all setigers thereafter, always single
(except for replacements). Hooks slender, distally abruptly
tapering to simple, blunt tips.
UNKNOWN MORPHOLOGICAL FEATURES.—Jaw structure.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—Mx III short; forming part of distal arc with left Mx
IV.