A Review of the Genus Eunice - Smithsonian Institution Libraries

336 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
TABLE 17.—Variable and invariable features in the type lot of Eunice violaceomaculata (N = number of
individuals examined; SD = standard deviation; measurements in mm; * = SD not calculated).
VARIABLE FEATURES
No. of setigers
Total length
Maximum width
Length through 10
No. of antennal articulations
No. of pcristomial cirral articulations
Branchiae first present from setiger no.
Max. no. of branchial filaments
Ventral cirri inflated through setiger no.
No. of pectinate teeth
Subacicular hooks first present from setiger no.
N
2
2
4
4
3
3
4
4
2
3
4
Max.
215
170
22
40
18
9
7
30
70
10
77
Min.
114
62
5
7
7
5
6
12
50
9
25
Mean
164.50
116.00
10.75
18.25
13.33
6.67
6.25
20.25
60.00
9.67
44.25
SD
*
*
7.68
14.80
5.69
2.08
0.50
7.41
•
0.58
22.65
INVARIABLE FEATURES
Separation of rings
Peristomial cirri reach
No. of notopodial cirral articulations
Notopodial cirri articulated
Pectinate setae
Shaft of compound falcigers
Guards of compound falcigers
Acicular color
Acicular shape
Subacicular color
No. of subacicular teeth
Core-sheath construction
N=4
visible dorsally and ventrally
middle of prostomium
6
throughout body
flat; tapering
tapering
symmetrically rounded
dark brown
tapering
brown
2
distinct
spaced, similar in thickness. Ceratophores ring-shaped in all
antennae, without articulations. Ceratostyles slender and
tapering, with up to 10 cylindrical articulations in A-III. A-I to
posterior peristomial ring; A-II to setiger 4; A-III to setiger 7
(complete only in a single specimen). Peristomium flaring
anteriorly, more strongly so when distorted by everted jaws,
with distinct muscular lower lip. Separation between rings
distinct dorsally and ventrally; anterior ring 5 /6 of total
peristomial length. Peristomial cirri to front margin of
peristomium or to middle of prostomium, slender and tapering,
with 6 articulations.
Maxillary formula (summarized for 2 specimens) 1+1, 5+5,
6-7+0,4-6+9, and 1+1. Mx III short, forming part of distal arc
with left Mx IV. Mx VI missing.
Branchiae (Figure 1141) present, pectinate, distinctly longer
than notopodial cirri, not reduced in mid-body region, erect.
Branchiae from setiger 6-7 to setiger 215. Branchiae present to
near posterior end, present on more than 65% of total number
of setigers. Maximum 20 filaments at about setigers 15-20.
Branchial stems thick, relatively pliable, doubled over in
several segments. Filaments digitiform, distinctly shorter than
notopodial cirri.
Neuropodial acicular lobes obliquely truncate with aciculae
emerging from elevated knobs near superior end of lobes. All
presetal lobes low transverse folds. Anterior and median
postsetal lobes following outline of acicular lobes closely,
becoming free, inferiorly elevated folds in posterior setigers!
First 4 ventral cirri thick and tapering, nearly triangular in
outline. Ventral cirri basally inflated from about setiger 5 and
retaining inflated base through first half of body. Inflated bases
thick transverse welts, relatively low in setigers 25-35,
thereafter becoming more distinctly rounded cushions in next
20 or so setigers. Far posterior ventral cirri triangular in outline
and tapering to blunt tips, forming shallow scoops around
lower edge of parapodia. All notopodial cirri tapering, with up
to 6 long, cylindrical articulations in anteriormost setigers
(Figure 114i). Notopodial cirri of larger specimens rather thick
basally, retaining tapered tips in all setigers. Notopodial cirri
shorter than branchiae except in anteriormost and posteriormost
branchiated setigers.
Limbate setae marginally smooth. Pectinate setae (Figure
114k,m) flat, tapering, with rather wide, delicate teeth.
Marginal teeth no longer than other teeth; -7-8 teeth present.
Shafts of compound falcigers (Figure 114j,n) marginally
smooth, tapering. Appendages tapering and relatively short,
bidentate. In 1 specimen proximal teeth directed laterally, in
other specimens directed obliquely distally. Distal teeth slender
and obliquely curved in all specimens. Guards marginally
smooth, symmetrically rounded; mucros absent. Pseudocompound
falcigers and compound spinigers absent. Aciculae
single, dark brown to nearly black, tapering to slender tips,
distally curved or straight; cross-sections round. Subacicular
hooks (Figure 114o) dark brown, bidentate. Hooks first present
from setiger 25, 36, and 39, present in all setigers thereafter,