A Review of the Genus Eunice - Smithsonian Institution Libraries

44 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
TABLE 1.—Variable and invariable characters in the type lot of Eunice aedificatrix (N = number of individuals
examined; SD = standard deviation; measurements in mm; * = SD not calculated).
VARIABLE FEATURES
No. of setigers
Total length
Maximal width
Length through 10
No. of antennal articulations
No. of peristomial cirral articulations
Branchiae from setiger no.
Max. no. branchial filaments
Ventral cirri inflated through setiger no.
No. of articulations in notopodial cirri
Subacicular hooks from setiger no.
N
2
2
11
11
10
8
11
10
11
9
9
Max.
395
263
5
9
18
12
5
13
100
5
35
Min.
73
24
2
4
0
0
4
6
39
2
24
Mean
234
143.5
3.6
627
11.09
5.82
4.36
8.80
61.73
4.45
29.27
SD
•
•
1.07
1.44
4.61
3.71
0.50
2.30
19.35
1.04
3.00
INVARIABLE FEATURES
Shape of pectinate setae
No. of teeth in pectinate setae
Shafts of compound falcigers
No. of teeth in appendages
Color of aciculae
Aciculartip
Color of subacicular hooks
Teeth in subacicular hooks
Core-sheath construction
N=ll
flat
12
inflated
2
yellow
hammer-headed to bifid
yellow
3
distinct
to middle of setiger 1. Peristomium cylindrical, twice as long as
prostomium and at least x h wider. Peristomial fold with lateral
notches; lower lip distinctly muscular and with a median notch.
Separation between rings distinct dorsally and ventrally and
visible, but less distinct laterally; anterior ring 2 /3 of total
peristomial length. Peristomial cirri to middle of prostomium,
slender, inflated near bases, sometimes with 4 or 5 indistinct
articulations.
Summary maxillary formula for 3 syntypes 1+1, 6+7-8,
7-8+0, 6-7+9-11, and 1+1. Mx III long, straight, located
behind left Mx II; Mx VI absent.
Branchiae from setiger 4 to setiger 250. First and last 10
branchiae single filaments. All other branchiae erect (Figure
4b), pectinate with maximum 11 filaments at setiger 15. Most
branchiae posterior to setiger 35 with 3-4 filaments. No
increase in number or length of filaments towards posterior
end. Branchiae longer than notopodial cirri in all but first 4
branchial setigers. Filaments as long as notopodial cirri, slender
and digitiform. Stems longer than filaments, tapering.
Neuropodial acicular lobes distally rounded or truncate with
aciculae emerging near the middle. Pre- and postsetal lobes low
transverse folds. First 3 ventral cirri thick and tapering,
thereafter basally inflated. Inflated base ovate, reduced from
about setiger 45, with distinct tapering narrow tips. Posterior
ventral cirri tapering and increasingly slender in far posterior
setigers. Notopodial cirri basally inflated, becoming narrower
and increasingly digitiform in far posterior setigers; articulations
absent.
Limbate setae longer than compound hooks and marginally
finely serrated. All pectinate setae tapering, furled, with about
10 coarse teeth. One marginal tooth somewhat longer and
distinctly coarser than other teeth. All shafts of compound
hooks (Figure 4e) distally inflated and marginally serrated,
distinctly slimmer than aciculae and subacicular hooks.
Appendages slender and tapering. Proximal tooth triangular
and directed laterally; distal tooth gently curved, tapering,
longer than proximal tooth. Guards distally symmetrically
sharply pointed, but not mucronate; margin serrated. Aciculae
yellow, paired, round in cross-section. Superior aciculae
hammer-headed; inferior aciculae bent and tapering in anterior
setigers, becoming hammer-headed posterior to setiger 25
(Figure 4c). Subacicular hooks (Figure 4d) yellow and
tridentate, without distinct separation of cores and sheaths.
Hooks first present from setiger 35, thereafter present in all
setigers, always single. Hooks curved with teeth decreasing
evenly in size from curved main fang.
Tube composed of pliable pergamentaceous flakes.
UNKNOWN MORPHOLOGICAL FEATURES.—Pygidium
anal cirri.
EXPECTED STATES OF SELECTED UNKNOWN FEATURES.—
Anal cirri long, tapering, with moniliform articulations.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—All characters scored.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Eunice aedificatrix was described as a subspecies
of E. antennata, with which it agrees in the possession of
tridentate yellow subacicular hooks, branchiae distributed
along the length of the body, and strongly articulated antennae.
Eunice aedificatrix is listed with similar species in Tables 46
and