A Review of the Genus Eunice - Smithsonian Institution Libraries

238 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
TABLE 11.—Variable and invariable features of the type lot of Eunice nicidioformis (N = number of individuals
examined; SD = standard deviation; measurements in mm).
VARIABLE FEATURES
N
Max.
Mm.
Mean
SD
No. of setigers
Total length
Maximal width
Length through 10
No. of antcnnal articulations
No. of peristomial cirral articulations
Branchiae first from setiger no.
Last branchiae on setiger no.
Ventral cirri inflated through setiger no.
No. of notopodial articulations
Subacicular hooks first present from setiger no.
10
10
10
10
9
10
9
9
10
10
10
97
47
2.2
6.5
15
10
8
50
26
6
25
58
25
1
4.2
5
4
6
19
12
4
14
86.70
36.15
1.80
5.21
10.22
8.60
6.56
32.00
21.80
4.30
21.40
11.15
7.39
0.33
0.67
2.77
1.78
0.73
10.32
3.91
0.67
3.03
INVARIABLE FEATURES
Separation of rings
Max. no. of branchial filaments
Notopodial articulations present
Acicular color
Subacicular color
No. of subacicular teeth
Core-sheath construction
N=10
visible donally and ventrally
1
anteriorly only
brown
brown
2
indistinct
distinctly digitiform, abruptly tapering distally. Notopodial
cirri longer than branchiae in all setigers.
Limbate setae marginally smooth. Anterior pectinate setae
(Figure 79g) tapering, flat, becoming slightly flaring in median
and posterior setigers (Figure 79k). One marginal tooth
distinctly longer than all other teeth; -10 teeth in anterior
setigers; -15 teeth in median and posterior setigers. Shafts of
compound falcigers (Figure 79h,l) tapering, marginally serrated.
Anterior appendages slender, slightly tapering, bidentate.
Proximal teeth shorter than distal teeth, triangular. Distal teeth
slender, curved. Median and posterior appendages shorter than
those in anterior setigers, more distinctly tapering, bidentate.
Proximal teeth longer than distal teeth, tapering, rather than
triangular. Distal teeth similar to those in anterior appendages.
Guards asymmetrically bluntly pointed; mucros absent. Pseudocompound
falcigers and compound spinigers absent. Aciculae
paired, brown, tapering with blunt tips, slightly bent
distally; cross-section round. Subacicular hooks (Figure 79m)
brown, bidentate. Hooks first present from setiger 25 (setigers
19-26 in paratypes), present in all setigers thereafter, always
single (except for replacements). Hooks curved, tapering.
Proximal teeth larger than distal teeth, triangular, directed
laterally. Distal teeth erect.
UNKNOWN MORPHOLOGICAL FEATURES.—Pygidium and
anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 33, 34, 39-42, 56, 58,
59. Unknown Characters: 4,6, 74, 78.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—Eunice nicidioformis is characterized by reduced
branchial equipment, reflected in Treadwell's choice of
specific name. The species is listed with similar species in
Tables 24 and 25. The structure of the posterior branchiae is
very unusual and may be unique in the genus; they form a
vascularized sleeve around the base of the notopodial cirri in
this species. In all other species of Eunice posterior single
branchial filaments are similar to the anterior ones in structure
in that they form a spur or a filament attached to the dorsal side
of the notopodial cirrus or emerge directly from the body wall.
In other features E. nicidioformis resembles E. gravieri as far as
the features listed in the tables are concerned, but lacks the
second pair of eyes described for the latter species.
135. Eunice nigricans Schmarda, 1861
FIGURE 80a-f; TABLES 27,29
Eunice nigricans Schmarda, 1861:131, 7 figs.
Eunice macrobranchia.—Augcner, 1925:27-28 [in part, not Eunice macro -
branchia Schmarda, 1861].
Eunice aphroduois.—HitVman, 1959:311 [not Nereis ophrodilois Pallas.
1788].
MATERIAL EXAMINED.—Holotype, ZMW, Inv. No. 1066,
South of Port Royal, Jamaica, coll. L. K. Schmarda.
DESCRIPTION.—Holotype complete with 180 setigers; total
length 100 mm; maximal width 7 mm at setigers 25-30; length
through setiger 10, 10 mm; width at setiger 10, 6 mm. Body
strongly dorsoventrally flattened.
Prostomium (Figure 80a) distinctly shorter and narrower
than peristomium, as deep as x /i of the peristomium. Prostomial
lobes frontally obliquely truncate, dorsally excavate with
thickened rim; median sulcus deep. Eyes between bases of A-I