A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 99
TABLE 3.—Variable and invariable features of the type lot of Eunice cariboea (N = number of individuals
examined; SD = standard deviation; measurements in mm).
VARIABLE FEATURES
N
Max.
Min.
Mean
SD
No. of setigers
Total length
Maximum width
Length through 10
Subacicular hooks first present from setiger no.
4 157
4 30
4 1.5
4 3
4 32
113
18
1
2
26
125.75
22.25
1.13
2.38
28.5
21.00
5.32
0.25
0.48
2.52
INVARIABLE FEATURES
A-I reach
A-II reach
A III reaches
Anlennal articulations
Peristomial cirri reach
Peristomial cirral articulations
Branchiae
Acicular color
Acicular lip
Subacicular color
Number of subacicular teeth
Tcdh in pectinate setae
Compound shafts
Teeth of compound setae
N=4
middle of peristomium
front of peristomium
middle of prostomium
absent
middle of peristomium
absent
absent
black
blunt or pointed
black
2
12
tapering
2
and is 30 mm long and 1 mm wide, and the length through
setiger 10 is 2 mm. The larger of the two complete
paralcctotypes in ZMB is here illustrated and described in
detail. The holotype of Nicidion incerta is presently in two
parts; it is, however, complete and in good condition. In order
to account for minor differences between the two described
taxa, the descriptions are presented separately.
DESCRIPTION.—Paralectotype of E. cariboea complete with
127 setigers; total length 24 mm; maximal width 1.2 mm wide
at setiger 10. Length through setiger 10, 2.5 mm. Body
anteriorly inflated, otherwise cylindrical throughout.
Prostomium (Figure 29g) distinctly shorter and narrower
than peristomium, as deep as x li of the peristomium. Prostomial
lobes frontally obliquely truncate; lobes triangular, dorsally
flattened; median sulcus shallow. Eyes small, indistinct,
posterior to bases of A-I. Antennae in a deep horseshoe; A-I
and A-II close together, separated from A-II I, similar in
thickness. Ceratophores ring-shaped in all antennae, without
articulations. Ceratostyles digitiform, stout, nearly sausageshaped,
without articulations. A-I to middle of first peristomial
ring; A-II and A-III to middle of second peristomial ring.
Peristomium slightly flaring anteriorly; lower lip distinct,
muscular. Separation between rings distinct dorsally and
ventrally, indistinct only for a short distance laterally; anterior
ring 3 A of total peristomial length. Peristomial cirri to posterior
end of first peristomial ring, nearly ovate, without articulations.
Jaws examined in a ZMC paralectotype. Maxillary formula
1+1, 5+5, 6+0, 4+9, and 1+1. Mx III long; located behind Mx
II; Mx VI absent.
Branchiae absent.
Anterior neuropodial lobes (Figure 29k) symmetrically
rounded, becoming symmetrically sharply pointed in posterior
setigers (Figure 291); aciculae emerging at midline. Presetal
lobes low, transverse folds; postsetal lobes following outline of
acicular lobes closely. Four or 5 first ventral cirri thick,
tapering. Ventral cirri basally inflated from about setiger 5.
Inflated bases transversely elongated, welt-like; narrow tips
digitiform. Inflated base decreasing in size from about setiger
50. Last 40 ventral cirri without inflated bases, short, nearly
tubercular. All notopodial cirri tapering, decreasing in length
from anterior to posterior end, without articulations. Anterior
notopodial cirri emerging close to parapodial bases; posterior
notopodial cirri emerging from dorsum well above parapodial
bases.
Limbate setae short, stout, geniculate, marginally serrated.
Two to 3 short pectinate setae (Figure 29h) in fascicle
anteriorly; shafts coarse, cylindrical; blades tapering; flat. One
marginal tooth longer than other teeth; -10 teeth present in a
seta. In far posterior setigers up to 10 long pectinate setae
(Figure 29n) in a fascicle; shafts slender, cylindrical; blades
flaring, flat. One marginal tooth longer than other teeth; up to
15 teeth in a seta. Shafts of compound falcigers (Figure 29j)
distally inflated, marginally serrated; beak indistinct. Appendages
very small, delicate; head small, bidentate. Proximal teeth
curved, tapering, directed obliquely distally; distal teeth longer
than proximal teeth, blunt, erect. Guards symmetrically bluntly
pointed, marginally serrated, without mucros. Pseudocompound
falcigers and compound spinigers absent. Aciculae
single; cross-sections round. Anterior aciculae tapering to sharp
tips, light brown to dark yellow. Aciculae mucronate (Figure
29i), bluntly pointed, dark brown or black from about setiger
30. Subacicular hooks (Figure 29m) dark brown or black,