A Review of the Genus Eunice - Smithsonian Institution Libraries

NUMBER 523 317
Hartman (1956, as E. (Nicidion) cariboea) after a reexamination
of the types of the former. The latter lacks
branchiae and has black subacicular hooks and aciculae; the
former has branchiae and amber-colored subacicular hooks and
aciculae. Eunice tenuis is listed with similar species in Tables
33 and 38; it differs from all other species in that group by the
very late appearance of branchiae, from setiger 81 in E. tenuis
and from setiger 28 in E. tentaculata, the species with the next
highest number. It is the only species listed in Table 38 to have
paired subacicular hooks in most sctigers; other species have
single hooks. It has light amber-colored aciculae and subacicular
hooks, rather than dark brown to black as usual in most other
species.
Eunice teretiuscula Schmarda, 1861
Eunice teretiuscula Schmarda, 1861:129, 6 figs., pi. 32: fig. 259.
Marphysa teretiuscula.—Quatrefages, 1866:337.—Ehlcrs, 1868:359.
REMARKS.—This species was originally described as lacking
peristomial cirri, a feature characteristic of the genus
Marphysa. The species will be treated in a forthcoming review
of that genus.
188. Eunice thomasiana Augener, 1922
FIGURE 108a-i; TABLES 24, 25
Eunice thomasiana Augener, 1922b:45.
MATERIAL EXAMINED.—Two syntypes, ZMH V-9763 and
ZMB 6398, St. Thomas, West Indies, Kukenthal and Hartmeyer
coll.
COMMENTS ON MATERIAL EXAMINED.—The Hamburg syntype
is complete and in good condition; the Berlin syntype is
incomplete and has been partially dehydrated. The description
and illustrations are based on the Hamburg syntype with
comments where the Berlin syntype differs.
DESCRIPTION.—Hamburg syntype complete female with
small eggs, with 99 setigers; total length 45 mm; maximal
width 3 mm; length through setiger 10, 6 mm. Body with
roughly circular cross-section, tapering evenly towards posterior
end. Berlin syntype incomplete with 97 setigers; length
about 40 mm; maximal width 3 mm.
Prostomium (Figure 108a) distinctly shorter and narrower
than peristomium, less than l /2 as deep as peristomium.
Prostomial lobes frontally obliquely truncate, dorsally flattened;
median sulcus shallow. Eyes between bases of A-I and
A-II. Antennae in a horseshoe, with A-I isolated by a gap,
similar in thickness. Ceratophores ring-shaped in all antennae,
without articulations. Ceratostyles slender and tapering, with
up to 11 long, distally well-separated, ovate articulations in
A-I 11, basally articulations cylindrical. A-I to setiger 3; A-II to
setiger 5; A-I 11 to setiger 6. Peristomium contracted in fixation,
cylindrical. Separation between rings distinct dorsally only;
anterior ring 4 /5 of total peristomial length; anterior ring
dorsally folded into several longitudinal folds. Peristomial cirri
to front edge of peristomium, digitiform, with 5 articulations.
Maxillary formula unknown.
Branchiae present, palmate, distinctly shorter than notopodial
cirri, not reduced in mid-body region. Branchiae from
setiger 4 to setiger 79, from setiger 4 to last setiger present in
incomplete syntype. Branchiae terminating well before posterior
end, present on more than 65% of total number of setigers.
Most branchiae single filaments (Figure 108e); maximum
number of filaments 3 in a few setigers around setiger 15.
Filaments short, digitiform.
First few neuropodial acicular lobes symmetrically rounded
(Figure 108d); all other acicular lobes distally conical; aciculae
emerging at midline. All pre- and postsetal lobes low,
transverse folds. First 4 ventral cirri thick and tapering. Ventral
cirri basally inflated from about setiger 5 through setiger 40.
Inflated bases thick, transverse welts; narrow tips tapering.
Posterior ventral cirri tapering, without basal inflations. All
notopodial cirri digitiform, longer than branchiae, with up to 4
articulations anteriorly; posterior setigers usually with 2
articulations; distalmost articulation ovate.
Limbate setae slender, marginally finely serrated in anterior
setigers, marginally smooth in posterior setigers. Anterior
pectinate setae (Figure 108b) furled, flaring. One marginal
tooth distinctly longer than other teeth; -15 teeth present
Posterior pectinate setae (Figure 108f) tapering, otherwise
similar to anterior pectinate setae. Shafts of compound falcigers
distally tapering, marginally smooth, without distal beak.
Anterior appendages (Figure 108c) tapering, with distinct head,
bidentate. Proximal teeth larger than distal teeth, triangular,
directed laterally. Distal teeth nearly erect, tapering. Posterior
appendages (Figure 108h) less distinctly tapering, bidentate.
Proximal teeth larger than distal teeth, narrow, directed
laterally. Distal teeth distinctly bent than in anterior appendages.
Guards asymmetrically bluntly pointed, marginally
smooth; mucros absent. Pseudocompound falcigers and compound
spinigers absent. Aciculae (Figure 108i) paired, brown,
curved slightly dorsally, flattened, knife-edged, tapering to
blunt tips. Subacicular hooks (Figure 108g) brown, bidentate.
Hooks first present from setiger 22 (from setiger 24 in Berlin
syntype), present in all setigers thereafter, mostly single, rarely
paired. Hooks tapering to narrow necks; heads large. Proximal
teeth larger than distal teeth, tapering, directed laterally, but
distally slightly upturned. Distal teeth erect, tapering.
UNKNOWN MORPHOLOGICAL FEATURES.—Jaw structure;
pygidium and anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—Mx III short; forming part of distal arc with left Mx
IV.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 34, 56, 58, 59. Unknown
Characters: 4, 6, 39, 40, 74, 78.
ASSUMED STATES FOR PURPOSE OF PREPARING
None.
KEY.—