A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 59
TABLE 2.—Variable and invariable characters in the material examined of Eunice antennata (X = number of
individuals examined; SD = standard deviation; measurements in mm).
VARIABLE FEATURES
Maximal width
Length through 10
No. of antennal articulations
No. of perislomial cirral articulations
Branchial start
Max. no of branchial filaments
Ventral cirri inflated through setiger
No. of notopodial articulations
No. of teeth in pectinate setae
Subacicular hooks first present from setiger
N
6
6
6
6
6
6
6
6
6
6
Max.
3.5
7.5
29
4
7
11
33
5
15
29
Min.
2
4
16
3
5
4
24
2
12
21
Mean
2.58
5.50
21.17
3.67
6.20
7.50
30.33
3.83
12.50
26.33
SD
0.66
1.18
4.49
0.52
0.84
2.26
3.27
0.98
1.22
3.33
INVARIABLE FEATURES
Length of perislomial cirri
Reduced branchial section
Pectinate setae
Shaft of compound falcigers
Acicular color
Aciculartips
Subacicular color
Core-sheath construction
No. of subacicular teeth
N=6
to middle of peristomium
present
flared and flat
inflated
yellow
blunt or pointec1
yellow
invisible
3
Branchiae present, pectinate, distinctly longer than notopodial
cirri, reduced in mid-body region, erect. Branchiae from
setiger 7 to setiger 92. Branchiae present to near posterior end,
present on more than 65% of total number of setigers. All
branchiae except the last 3 with at least 2 filaments; first
branchia with 4 filaments, maximum 7 relatively short
filaments. Stems short, tapering. Filaments (Figure lie) no
longer than notopodial cirri. Number of filaments reduced to 2
or 3 in setigers 50 to 70, increasing to 4 in setigers 75-85,
thereafter branchiae decreasing rapidly both in size and
numbers of filaments, absent in last 6 setigers.
Anterior neuropodial lobes truncate; posterior acicular lobes
somewhat more conical, but retaining broadly transverse shape
in all setigers; aciculae emerging near midline. Pre- and
postsetal lobes low, transverse folds. First 4 ventral cirri thick,
tapering, becoming basally inflated from about setiger 5.
Inflated bases relatively modest, ovate, lost by setiger 35;
narrow tips digitiform. Posterior ventral cirri increasingly
slender, elongated towards the posterior end, digitiform, and
longer than notopodial cirri in last 10-15 setigers. All
notopodial cirri basally inflated, with 2-3 long, cylindrical
articulations. Notopodial cirri increasing by one-third in length
in early branchial setigers, decreasing in length towards
posterior end, finally being as long as in first setigers.
Limbate setae slender, marginally smooth. Shafts of pectinate
setae (Figure lie) flat, wide. Blades flat, flared. One
marginal tooth longer than other teeth, with -15 teeth. Shafts of
compound falcigers (Figure 1 lb) strongly inflated, marginally
smooth; distinct beaks small. Appendages thick, with distinct
bosses on cutting edge near base, bidentate. Proximal teeth
directed laterally, slightly narrower than distal teeth. Distal
teeth thick, curved. Guards asymmetrically bluntly pointed,
without mucros. Pseudocompound falcigers and compound
spinigers absent. Aciculae paired, yellow, tapering, blunt,
straight, cross-sections round. Separation between core and
sheath indistinct in both aciculae and subacicular hooks.
Subacicular hooks (Figure 1 Id) yellow, tridentate with teeth in
a crest. Hooks first present from setiger 25, present in all
setigers thereafter, always single (except for replacements).
Fangs decreasing evenly in size from large main fang to small
tertiary fang.
UNKNOWN MORPHOLOGICAL FEATURES.—Jaw structure;
pygidium and anal cirri.
EXPECTED STATES OF SELECTED UNKNOWN FEATURES.—
Mx III long, straight and located behind left Mx II. Distal arc
absent; Mx VI absent. Anal cirri long, with moniliform
articulations.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 56, 58, 59. Unknown
Characters: 4, 6,42
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—As noted in the introduction, Lamarck is the
author of both the genus Leodice and this species. Savigny was
clearly responsible for recognizing, describing, and illustrating
the species, but did not publish his description until 1820; in the
meantime, Lamarck and Cuvier both had taken advantage of
their access to his manuscript.
Eunice antennata was described from the Gulf of Suez and
has been reported from worldwide areas. Restriction of the
species implied by the definition given above excludes a large
number of morphs reported from other areas. Eunice antennata