A Review of the Genus Eunice - Smithsonian Institution Libraries

126 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
TABLE 4.—Variable and invariable features in the type lot of Eunice dubitala (N = number of individuals
examined; SD = standard deviation; measurements in mm).
VARIABLE FEATURES Max. Min. Mean SD
Maximal width
Length through 10
No. of antennal articulations
No. of perislomial cirral articulations
Branchial start
Last branchia on setiger no.
Max. no. of branchial filaments
Ventral cirri inflated through setiger no.
No. of articulations in notopodial cirri
Subacicular hooks first present from setiger no.
4 7
4 17
4 12
4 7
4 5
4 48
4 3
4 40
4 6
4 38
6
15
10
4
3
35
2
38
4
35
6.6
15.8
10.4
5.2
4
39.6
2.8
39.2
5.4
36.2
0.55
0.84
0.89
1.30
0.71
4.93
0.45
1.10
0.89
1.64
INVARIABLE FEATURES
Anterior and posterior peristomial rings distinct
Peristomial cirri reach
Notopodial cirri articulated
Shape of pectinate setae
No. of teeth in pectinate setae
Acicular color
Acicular tips
Color of subacicular hooks
No. of teeth in subacicular hooks
Core-sheath construction
N=4
both dorsally and vcntrally
mid-prostomium
anteriorly only
tapering; flat
20
dark brown
tapering; bent
dark brown
2
indistinct
Limbate setae marginally serrated. Shafts of pectinate setae
(Figure 39e) wide, cylindrical. Blades tapering, flat. One
marginal tooth distinctly longer than other and both marginal
teeth longer than other teeth, with about 20 very fine, slender
teeth. Shafts of compound falcigers (Figure 39a,0 slightly
inflated, internally striated at least in posterior setigers, without
serrations; distal beaks indistinct. Appendages tapering with
rather large head, bidentate. Proximal teeth shorter than distal
teeth, triangular, directed laterally or slightly distally. Distal
teeth gently curved or nearly erect. Guards tight fitting,
symmetrically rounded or bluntly pointed; margin serrated near
bases; mucros absent. Pseudocompound falcigers and compound
spinigers absent. Aciculae and subacicular hooks with
indistinctly marked dark brown to black cores and clear
sheaths. Aciculae (Figure 39d) at least paired, tapering with
slightly bent tips; cross-section round, sometimes with a
subdistal boss. Subacicular hooks (Figure 39b) bidentate.
Hooks first present from setiger 35-38, present in all setigers
thereafter, always single (except for replacements). Hooks
gently inflated subdistally, tapering to narrow necks and small
heads. Proximal teeth larger than distal teeth, tapering, directed
laterally. Distal teeth triangular, nearly erect.
UNKNOWN MORPHOLOGICAL FEATURES.—Pygidium
anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 34, 56, 58, 59. Unknown
Characters: 1,2.
and
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—The species name as originally proposed is
grammatically incorrect as pointed out by Inger Winsnes (in
litt.). The species is listed with similar species in Tables 24 and
25. Species in this group with poorly developed, palmate
branchiae include E. palauensis, E. stanleyi, and E. thomasiana,
in addition to E. dubitata. Among these species E.
palauensis lacks ceratostyle articulations; the other three
species have articulated ceratostyles with the distalmost
articulations drop-shaped or moniliform. The type of E.
dubitata is about twice as large as those of the two remaining
species. The last branchiae are present on setiger 79 in E.
thomasiana, on setiger 33 in E. stanleyi, and on setigers 38-48
in the much larger E. dubitata. Eunice stanleyi has maximally
two branchial filaments; E. dubitata has three; other differences
between these two species are discussed below in the
"Remarks" section on E. stanleyi.
Eunice ebranchiata Quatrefages, 1866
Eunice ebranchiata Quatrefages, 1866:316-317.
Eunice siciliensis.—Ehlers, 1868:353.—Grube, 1870a:296.
REMARKS.—The original description is brief, but includes
the information that branchiae are missing; that the mandibles
are very large and encloses the other jaws; and that the antennae
are short. Grube (1870a:296) examined the type and declared it
completely in agreement with many specimens he had seen of
Eunice siciliensis. The species is here considered a member of
the genus Palola.