A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 339
TABLE 18.—Variable and invariable features in the material examined of Eunice vittata (N = number of
individuals examined; SD = standard deviation; measurements in mm).
VARIABLE FEATURES
No. of setigers
Total length
Maximal width
Length through 10
No. of antennal articulations
Last branchiae on setiger no.
Max. no. of branchial filaments
Ventral cirri inflated through setiger no.
Subacicular hooks first present from setiger no.
N
4
4
4
4
4
4
4
4
4
Max.
78
24
2
4
8
27
12
25
22
Min.
62
9
0.75
1.75
4
20
6
19
20
Mean
69.75
19.13
1.69
3.44
7.00
23.75
9.00
23.50
20.75
SD
7.14
6.98
0.63
1.13
2.00
2.99
2.45
3.00
0.96
INVARIABLE FEATURES
Separation of rings
Perislomial cirri reach
No. of perislomial cirral articulations
Branchiae first present from setiger no.
Notopodial articulations
Pectinate setae
No. of pectinate teeth
Shaft of compound falcigers
Acicular color
Subacicular color
No. of subacicular teeth
Core-sheath construction
N=4
visible on all sides
middle of prostomium
3
3
absent
tapering; flat
5
inflated
yellow
yellow
3
indistinct
superiorly; these sections wrapped around superior edge of
acicular lobes and terminating on front of acicular lobes
approximately at midline, covering emerging aciculae. Remainder
of postsetal lobes following outline of acicular lobes
closely. High sections located inside presetal lobes on anterior
face of parapodia, reaching well beyond acicular lobes. First 4
ventral cirri tapering and blunt-tipped. Ventral cirri basally
inflated from about setiger 5 through setiger 25. Inflated base
ovate and very distinctly set off from large, tapering narrow
tips. Bases of ventral cirri merge into body wall posterior to
setiger 25, in posterior setigers only tapering, blunt tips of
ventral cirri retained. Anterior notopodial cirri basally slightly
inflated, tapering distally to slender, digitiform tips. Posterior
notopodial cirri reduced in length to ~ x li of length in anterior
setigers, tapering from base. Notopodial cirri without articulations.
Limbate setae nearly capillary with very indistinct limbation,
relatively thick with short, tapering tips, marginally very finely
pilose. All pectinate setae (Figure 115c,h) very small, tapering,
flat One marginal tooth very thick and long; ~5 teeth present.
Anterior pectinate setae slightly larger than posterior ones.
Shafts of compound falcigers (Figure 115b,g) inflated with
distinct distal beak, marginally coarsely serrated. Anterior
appendages slightly longer than posterior ones, and slightly
less tapering, bidentate. Proximal teeth narrowly triangular and
directed slightly basally. Distal teeth distinctly shorter than
proximal teeth, bent and directed laterally, thick and relatively
blunt in posterior setigers, slender and tapering in anterior
setigers. Anterior guards tapering to sharp, symmetrical tips,
but not mucronate. Posterior guards symmetrically rounded, all
guards marginally finely serrated; mucros absent. Pseudocompound
falcigers and compound spinigers absent. Aciculae
(Figure 115i) paired, tapering, clear yellow; tips distinctly bent
ventrally; cross-sections round. Dorsal aciculae in posterior
setigers with short, pointed guards. Separation between core
and sheath indistinct in both aciculae and subacicular hooks.
Subacicular hooks (Figure 115f) yellow, tridentate with teeth in
a crest. Hooks first present from setiger 20-22, present in all
setigers thereafter; multiple hooks in most setigers.
UNKNOWN MORPHOLOGICAL FEATURES.—None.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 56, 58, 59. Unknown
Characters: None.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Eunice vittata is listed with similar species in
Tables 41 and 42. The relationship between this species and
other species with multiple subacicular hooks and articulated
ceratostyles was indicated in the remarks to E. indica.
Eunice vittata has been reported from all over the world.
Most of these reports probably are of related species, including
the species listed in Table 42.