A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 227
126. Eunice multicylindri Shisko, 1981
FIGURE 75f-i; TABLES 10,41,42
Eunice multicylindri Shisko, 1981:971-973. figs. 2a-d, table 1.
MATERIAL EXAMINED.—Holotype, USNM 63066, and 2
paratypes, USNM 63067, Southern California, 32°43.87'N,
119°9.86'W, 81 m, coarse sand, 17 Feb 1956, BLM sta
24356BFI; 2 paratypes, USNM 63068, Southern California,
33°51.46H 119°57,13'W, 87 m, coarse sand, 13 Oct 1975,
BLM sta 22952BFI; 2 paratypes, USNM 63069, Southern
California, 33°39.99'N, 120°0.1'W, 120 m, sand and gravel, 19
Oct 1975, BLM sta 23087BFI; 1 paratype, USNM 63070,
Southern California, 33°59.78TSf, 120°22.33'W, 70 m, 6 Nov
1975, BLMsta23170BFI.
COMMENTS ON MATERIAL EXAMINED.—Measurements of
paratypes, including one juvenile, are summarized in Table 10.
DESCRIPTION.—Holotype complete with 115 setigers; total
length 45 mm; maximal width 1 mm; length through setiger 10,
3.5 mm. Body cylindrical, slender, with short, inconspicuous
parapodia. Anal cirri as long as last 15 setigers together.
Prostomium (Figure 75f) distinctly shorter and narrower
than pcristomium, as deep as l /2 of peristomium. Prostomial
lobes frontally rounded, dorsally excavate with a thickened
rim; median sulcus deep. Eyes lateral to bases of A-II, large,
dark. Antennae arranged in a horseshoe, with A-III isolated by
a gap, similar in thickness. Ceratophores ring-shaped in all
antennae, without articulations. Ceratostyles digitiform, distally
abruptly tapering, with a few, large cylindrical articulations;
maximum 4 articulations in A-III. A-I to posterior
peristomial ring. A-II and A-III to setiger 1. Peristomium
cylindrical. Separation between rings distinct on all sides, but
best marked dorsally and ventrally; anterior ring 2 /3 of total
peristomial length. Peristomial cirri to anteriormost edge of
peristomium or middle of prostomium, digitiform, with 2 to 4
cylindrical articulations.
Maxillary formula of paratype from USNM 63067 1+1,8+8,
8+0, 7+10, and 1+1. Mx III long, located behind left Mx II.
Jaws very lightly sclerotinized without any trace of calcification.
Branchiae present, pectinate, distinctly longer than notopodial
cirri, not reduced in mid-body region, erect. Branchiae
from setiger 3 to setiger 40. Branchiae terminating well before
posterior end, present on less than 55% of total number of
setigers. First 2 and last 10-15 branchiae single filaments;
maximum 4 filaments. Filaments digitiform, about as long as
notopodial cirri.
All neuropodial acicular lobes truncate or rounded; aciculae
emerging at midline. All pre- and postsetal lobes low,
transverse folds. First 5-6 ventral cirri thick, tapering, basally
inflated from setigers 6-7 through setiger 45-50. Inflated
bases modest, ovate; narrow tips long and tapering. Inflated
portion lost by setiger 50; posterior ventral cirri tapering. All
notopodial cirri slightly inflated basally, tapering to digitiform
tips; notopodial cirri thinner in posterior than in anterior
setigers, retaining same length. Notopodial cirri without
articulations.
Limbate setae marginally smooth. Pectinate setae (Figure
75h) tapering, furled. Both marginal teeth longer than other
teeth; 1 marginal tooth longer than other; -12 teeth present.
Shafts of compound falcigers (Figure 75i) slightly inflated,
marginally serrated. Appendages long, slightly tapering,
bidentate. Proximal teeth very much larger than distal teeth,
triangular, directed slightly basally. Distal teeth distinctly
hooked. Guards asymmetrically bluntly pointed; mucros
absenL Pseudocompound falcigers and compound spinigers
TABLE 10.—Variable and invariable features in the type lot of Eunice multicylindri (N = number of individuals
examined; SD = standard deviation; measurements in mm).
VARIABLE FEATURES
N
Max.
Min.
Mean
SD
Maximal width
Length through 10
No. of antennal articulations
No. of peristomial cirral articulations
Branchiae first present from setiger no.
Last branchiae on setiger no.
Max. no. of branchial filaments
Ventral cirri inflated through setiger no.
Subacicular hooks first present from setiger no.
8
8
8
8
8
8
8
8
8
1
3.5
8
4
4
40
4
45
27
0.1
1.2
4
0
3
20
1
30
13
0.51
2.63
5.63
1.25
3.38
29.63
2.63
39.88
23.50
0.26
0.78
1.30
1.75
0.52
6.55
0.92
6.38
4.66
INVARIABLE FEATURES
Separation between rings
Pectinate setae
Acicular color
Acicular shape
Subacicular color
No. of subacicular teeth
Core-sheath construction
N=8
visible on all sides
furled; tapering
yellow
tapering;! straight
yellow
3
indistinct