A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 319
REMARKS.—Eunice thomasiana has not been reported since
its original description. It is listed with similar species in Tables
24 and 25. It can be separated from all other species in these
tables by the presence of knife-edged aciculae, a feature more
common in species in Table 27.
189. Eunice tibiana (Pourtales, 1867)
FIGURE 108j-r, TABLES 27,31
Marphysa tibiana Pourtales, 1867:108.
Eunice tibiana.—Ehlers, 1887:90-91, pi 27: figs. 1-13.
MATERIAL EXAMINED.—Lectotype, MZC, Caribbean Sea,
22°09'30"N, 82°21'30"W, 443 m, Sigsbee sta 11.
DESCRIPTION.—Lectotype complete, of unknown sex, with
165 setigers; total length 73 mm; maximal width 3 mm; length
through setiger 10, 5.5 mm. Body roughly circular in
cross-section, tapering abruptly anteriorly, tapering gently
towards posterior end. Anal cirri as long as last 3 setigers,
basally inflated.
Prostomium (Figure 108m) distinctly shorter and narrower
than peristomium, less than x li as deep as peristomium.
Prostomial lobes frontally obliquely truncate, dorsally flattened;
median sulcus rather shallow. Eyes posterior to bases of
A-I, chestnut-colored. Antennae in transverse row, evenly
spaced, similar in thickness. Ceratophores ring-shaped in all
antennae, without articulations. Ceratostyles slender and
tapering, with up to 20 irregular, indistinct cylindrical
articulations in A-I 11. A-I to setiger 1; A-I I to setiger 11; A-I 11
to setiger 13. Peristomium cylindrical. Separation between
rings distinct ventrally and dorsally; anterior ring 4 /5 of total
peristomial length. Peristomial cirri reaching beyond tip of
prostomium, slender and tapering, with 7 or 8 indistinct,
irregular cylindrical articulations.
Maxillary formula 1+1, 7+8, 8+0, 8+12, and 1+1. Mx HI
long, located behind left Mx II.
Branchiae (Figure 108n) present, pectinate, distinctly shorter
than notopodial cirri, not reduced in mid-body region, erect.
Branchiae from setiger 6 to setiger 135. Branchiae terminating
well before posterior end; present on more than 65% of total
number of setigers. First and last 10-15 pairs single filaments;
maximum 5 filaments. Branchial stems short, tapering.
Filaments digitiform, shorter than notopodial cirri.
Anterior neuropodial acicular lobes (Figure 108j) distally
conical, becoming obliquely triangular in median and posterior
setigers; aciculae emerging either at midline or dorsal to
midline. Presetal lobes low, transverse folds. Anterior postsetal
lobes nearly as high as acicular lobes, transverse, becoming
reduced to low folds by setiger 30. Ventral cirri in first setiger
long, tapering. Next 3 ventral cirri thick, much shorter than in
setiger 1. Ventral cirri basally inflated from setiger 5 through
setiger 45, thereafter inflated bases rapidly reduced over next
10 setigers. Inflated bases thick, transverse welts; narrow tips
tapering. Posterior ventral cirri short, triangular, located behind
subacicular hooks. Notopodial cirri basally inflated, without
articulations. Notopodial cirri of setiger 1 longer than those of
next following setigers and considerably less inflated basally.
Limbate setae relatively short, marginally smooth, sharply
tapering. Pectinate setae (Figure 1081,p) flat, flaring. Marginal
teeth no longer than other teeth, with 15 teeth. Number of
compound falcigers high in first third of body; in most
remaining setigers number reduced to 1 or 2 per parapodium.
Shafts of compound falcigers (Figure 108k,p) inflated, marginally
serrated. Appendages tapering, rather thick, especially in
median and posterior setigers, bidentate. Proximal teeth thicker
than distal teeth, triangular. Distal teeth gently curved, nearly
erect Guards asymmetrically sharply pointed, but not mucronate.
Pseudocompound falcigers and compound spinigers
absent. Aciculae paired, honey-colored, tapering, pointed,
straight; aciculae especially heavy in second third of body;
cross-sections round. Subacicular hooks (Figure 108o,r) honeycolored,
bidentate. Hooks first present from setiger 26, present
in all setigers; up to 5 hooks in vertical row present in each
setiger. Hooks very thick, with small, abruptly tapering heads.
Proximal teeth slightly larger than distal teeth, directed
laterally. Distal teeth erect. Ventralmost hook often worn, may
appear unidentate.
UNKNOWN MORPHOLOGICAL FEATURES.—None.
EXPECTED STATES OF SELECTED UNKNOWN FEATURES.—
None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 56, 58, 59. Unknown
Characters: 4, 6, 74,78.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—The specimen selected as lectotype is one of the
specimens examined and described by Ehlers (1887). Pourtales
(1867) described only the tube, as being horn-colored with
alternating openings. Ehlers added the first description of the
animals inhabiting these tubes. No material is left from
Pourtales study, thus the concept of this species has always
been based on Ehlers' description.
Eunice tibiana is compared to similar species in Tables 27
and 31. Multiple subacicular hooks are present in two species in
Table 31; of these two, E. borneensis has very short peristomial
cirri. The peristomial cirri in E. tibiana outreach the prostomium.
Other differences can be found by comparing entries in
Table 31, illustrations, and descriptions.
190. Eunice torquata Quatrefages, 1866
FIGURE 109a-f; TABLES 27,28
Eunice torquata Quatrefages, 1866:312-313, pi. 10.
MATERIAL EXAMINED.—Holotype, MNHN, Paris, A.l(R.)-
1868-no. 47a, SL-Jean-de-Luz, coll. Quatrefages.
DESCRIPTION.—Specimen incomplete with 120 setigers;
length 97 mm; maximal width 4 mm; length through setiger 10,