A Review of the Genus Eunice - Smithsonian Institution Libraries

292
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
longer than other teeth; -10 teeth present. Shafts of anterior and
median compound falcigers (Figure 98hjc) inflated, marginally
serrated; those of posterior falcigers tapering and smooth
(Figure 98q). Appendages thick with very nearly parallel sides,
bidentate. Proximal teeth larger than distal teeth, triangular,
directed laterally. Distal teeth nearly straight, directed obliquely
distally. Guards asymmetrically bluntly pointed; mucros
absent. Pseudocompound falcigers and compound spinigers
absent. Aciculae paired, yellow. Anterior aciculae tapering to
blunt tips, gently curved or straight. In median setigers inferior
aciculae (Figure 98n) blunt-tipped, distinctly sharply bent.
Posteriorly inferior aciculae (Figure 98r) indistinctly bifid,
slender, superior aciculae distinctly bifid with teeth of different
sizes, thick; cross-sections round. Separation between core and
sheath indistinct in both aciculae and subacicular hooks.
Subacicular hooks (Figure 98m,p) yellow, tridcntate with teeth
in a crest. Hooks first present from setiger 27, present in all
setigers thereafter, paired in some setigers. Two distal fangs
grouped on common bases; tertiary fangs very small in median
setigers, becoming more distinct in posterior setigers.
UNKNOWN MORPHOLOGICAL FEATURES.—Jaw structure;
pygidium and anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—None.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 56, 58, 59. Unknown
Characters: 1,2,4,6,23, 36-38,40.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—37,1;
38,1.
REMARKS.—Eunice rubra is listed with similar species in
Tables 46 and 47. It has both pointed and weakly bidentate
aciculae. Other than E. elseyi, it has a far higher number of
branchial filaments than any other species with modified
aciculae listed in Table 47. Eunice rubra has crested tridentate
subacicular hooks; E. elseyi has hooks with the distal pair of
teeth in tandem.
172. Eunice rubrivittata (Treadwell, 1921)
FIGURE 99a-e; TABLES 41,42
Leodice rubrivitlata Treadwell, 1921:34-36, figs. 85-94, pi. 1: fig. 18.
Eunice viitata.—Augener, 1927:40.—Hartman, 1956:252 [in part, not Nereis
vittata Chiaje, 1829].
MATERIAL EXAMINED.—Holotype, AMNH 1263, Buccoo
Bay, Tobago land, 8 Apr 1918.
DESCRIPTION.—Holotype incomplete with 97 setigers;
length 56 mm; maximal width 1.2 mm; length through setiger
10, 5.1 mm.
Prostomium and peristomium about equal in length (Figure
99a), distinctly narrower than peristomium, less than V2 as deep
as peristomium. Prostomial lobes frontally rounded, dorsally
slightly flattened; median sulcus deep. Eyes not observed.
Antennae in a horseshoe, evenly spaced, similar in thickness.
Ceratophores ring-shaped in all antennae, without articulations.
Ceratostyles distally blunt, digiliform, with 2 or 3 irregularly
arranged, cylindrical articulations. A-I to middle of peristomium;
A-II and A-III to setiger 1. Peristomium cylindrical.
Separation between rings distinct on all sides of body; anterior
ring slightly longer than posterior ring. Anterior ring with
frontal, yoke-shaped thickening covering at pcristomial fold.
Peristomial cirri incomplete, probably slender and digitiform.
Jaws not available.
Branchiae (Figure 99c) present, pectinate, distinctly shorter
than notopodial cirri, not reduced in mid-body region, flexible.
Branchiae from setiger 3 to setiger 56. Branchiae terminating
well before posterior end, present on less than 55% of total
number of setigers. First 6 branchiae single, long filaments
which increase somewhat in length posteriorly. From setiger 9
another filament added; maximum 5 filaments from setiger 25
to 40. Number of filaments reduced to 1 by setiger 45.
Anterior ncuropodial acicular lobes distally obliquely transverse
with distinct, rounded lobes dorsal to emergence of
aciculae; posterior acicular lobes increasingly withdrawn into
body wall with aciculae emerging from tips; subacicular hooks
supporting a secondary, flattened conical structure along
ventral edge of parapodium (Figure 99b). All prc- and postsetal
lobes follow outline of acicular lobes closely. First 5 or 6
ventral cirri digitiform. Ventral cirri basal I y inflated from
setiger 6 through setiger 50. Inflated bases nearly spherical;
narrow tips digitiform. Ventral cirri digitiform from setiger 60,
emerging well distal to bases of parapodia. Anterior notopodial
cirri tapering, with 2 or 3 indistinct cylindrical articulations.
Posterior notopodial cirri long, digitiform, without articulations.
Limbate and pectinate setae not observed. Shafts of
compound falcigers (Figure 99c) inflated, marginally smooth.
Appendages bidentate. Proximal teeth much larger than distal
teeth. Distal teeth directed obliquely distally. Guards with very
short distal mucros. Pseudocompound falcigers and compound
spinigers absent. Aciculae single, yellow, tapering, straight;
cross-sections round. Notopodial aciculae distinct in anterior
and median setigers. Separation between core and sheath
indistinct in both aciculae and subacicular hooks. Subacicular
hooks (Figure 99d) yellow, tridentate with teeth in a crest.
Hooks first present from setiger 31, present in all setigers
thereafter, always single (except for replacements). Hooks with
very large, curved main fangs; fangs decreasing in size to very
short tertiary fang.
UNKNOWN MORPHOLOGICAL FEATURES.—Jaw structure;
pectinate setae; pygidium and anal cirri.
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, 13,14, 27-29,65-68.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.