A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 241
proximally cylindrical articulations; maximum 9 articulations
in A-III. A-I to posterior peristomial ring; A-II to setiger 4;
A-III to setiger 6. Peristomium cylindrical, with a distinct
muscular lower lip. Separation between rings distinct dorsally
and visible ventrally; anterior ring ~ 3 A of total peristomial
length. Peristomial cirri to middle of anterior peristomial ring,
without articulations.
Maxillary formula 1+1,6+6,8+0,5+8, and 1+1. Mx HI part
of distal arc with left Mx IV.
Branchiae (Figure 80h) present, pectinate, distinctly longer
than notopodial cirri, not reduced in mid-body region, erect.
Branchiae from setiger 3 to end of fragment. First 3 and last 45
pairs single filaments; maximum 3-4 filaments between
setigers 10-20. Filaments slender, digitiform, about as long as
notopodial cirri.
Anterior neuropodial lobes symmetrically bluntly pointed;
median and posterior acicular lobes (Figure 80m) conical;
aciculae emerging at midline. Pre- and postsetal lobes low,
transverse folds. First 4 ventral cirri thick, tapering. Ventral
cirri basally inflated from about setiger 5 to about setiger 25.
Inflated bases ovate; narrow tips digitiform. Posterior ventral
cirri tapering, conical. Anterior notopodial cirri slender,
filiform, with 6 to 7 articulations. Notopodial cirri decreasing
gradually in length, retaining same shape in all setigers;
articulations lost in first part of branchial region.
Limbate setae marginally serrated. Pectinate setae (Figure
80j,l) tapering, flat. One marginal tooth much longer than other
teeth; 7 teeth in anterior setigers; -12 teeth in posterior setigers.
Shafts of compound falcigers (Figure 80i) slightly inflated,
marginally smooth. Appendages long, tapering, bidentate.
Proximal teeth very much shorter than distal teeth, triangular,
directed laterally. Distal teeth distinctly hooked. Guards
symmetrically bluntly pointed; mucros absent Pseudocompound
falcigers and compound spinigers absent Aciculae
paired in anterior parapodia, single in median and posterior
parapodia, with brown cores and clear sheaths, tapering,
bluntly pointed, straight; cross-section round. Subacicular
hooks (Figure 80k) with dark brown cores and clear sheaths,
bidentate. Hooks first present from setiger 25, present in all
setigers thereafter, always single (except for replacements).
Hooks tapering, slightly bent Proximal teeth larger than distal
teeth, triangular, directed laterally. Distal teeth short, nearly
erect
UNKNOWN MORPHOLOGICAL FEATURES.-A11 features associated
with posterior setigers and pygidium.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 56, 58, 59. Unknown
Characters: 1,2,4,6, 36-40,47, 50, 63.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—37,1;
38,1.
REMARKS.—Eunice northioidea is listed with similar species
in Tables 27 and 32. It is first and foremost characterized
by having long, slender branchial filaments and long, strongly
articulated antennae. All species in Table 32, with the
exception of E. northioidea, have articulated peristomial cirri;
these cirri are short and completely without articulations in E.
northioidea.
137. Eunice norvegica (Linnaeus, 1767)
FIGURE 81a-e; TABLES 27,30
Nereis norvegica Linnaeus, 1767:3116.—Gunnerus, 1768, pl.2: fig.7.
Nereis madreporae pertusae Gunnerus, 1768:45-51, pi. 2: fig. 11.
Leodice norwegica Lamarck, 1818:323 [in part].—Orsted, 1845:402, 406 [in
part].
Leodice gunneri Storm, 1881:92-95.
Eunice norwegica.—Cuvier, 1817:525 [ in part].—Audouin and Milne
Edwards, 1833:219 [in part].—Grube. 1850:292.
MATERIAL EXAMINED.—Neotype and 1 additional specimen,
KNVSM, No. 63, ROberg, Statsbygd, Trondheimsfjorden,
Norway, 2 specimens.
DESCRIPTION.—Both specimens complete; one with 115
setigers of which last 15 in regeneration. Neotype with 157
setigers with last 20 discolored, possibly regenerating; total
length 200 mm; maximal width 9 mm; length through setiger
10,13 mm.
Prostomium (Figure 81a) distinctly shorter and narrower
than peristomium, as deep as l /2 of the peristomium. Prostomial
lobes frontally rounded, dorsally inflated; median sulcus deep.
Eyes hidden below overhanging peristomial fold, located
behind bases of A-II, black. Antennae in a horseshoe, evenly
spaced, similar in thickness. Ceratophores ring-shaped in all
antennae, without articulations. Ceratostyles digitiform, with
up to 16 distinct cylindrical articulations in A-III. A-I to middle
of peristomium; A-I to setiger 3; A-III to setiger 4. Peristomium
massive, muscular, cylindrical; frontal margin folded into
series of short scallops. Separation between rings distinct
dorsally and ventrally; anterior ring 4 /s of total peristomial
length. Peristomial cirri to front edge of prostomium, slender,
with one long and 7 short, bead-like articulations.
Maxillary formula of neotype 1+1, 7+7, 9+0, 4+9, 1+1, and
1+1. Mx III long; however, forming a distal arc with very short
left Mx IV.
Branchiae (Figure 81e) present, pectinate, about as long as
notopodial cirri, not reduced in mid-body region, erect.
Branchiae from setiger 7 to setiger 155. Branchiae present to
near posterior end, present on more than 65% of total number
of setigers. First and last 3 branchiae single filaments, all others
pectinate with up to 7 branchial filaments. Filaments short,
digitiform.
Anterior neuropodia truncate, becoming rounded in posterior
setigers; aciculae emerging at midline. All pre- and postsetal
lobes low, transverse folds. First 6 ventral cirri thick, tapering.
Ventral cirri basally inflated from about setiger 7 through
setiger 80. Inflated bases ovate; narrow tips digitiform. Inflated
bases gradually decreasing posteriorly; last 50 ventral cirri