A Review of the Genus Eunice - Smithsonian Institution Libraries

22 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
3. bases scoop-shaped
The scoop-shaped bases are folded around the lower edge of the
neuropodium and usually enclose the emerging bases of the
subacicular hooks; the scoop-shaped region is usually angled,
and so it reaches farther dorsally on the posterior face of the
parapodium than on the anterior face.
55. median inflated ventral cirri
1. narrow tips short and button-shaped
2. narrow tips tapering
3. narrow tips digitiform
4. narrow tips absent
In nearly all species, median ventral cirri have a distinctly
marked tip lacking the distinct glands present in the bases; the
presence of these glands makes it possible to recognize the
presence of the base, without the narrow tip.
56. median ventral cirri
1. tapering
2. digitiform
This character is scored only for species in which the bases are
not inflated.
57. posterior ventral cirri
1. basally inflated
2. without basal inflation
58. bases of posterior inflated ventral cirri
1. ovate or spherical
2. thick, transverse welts
3. triangular welts
4. scoop-shaped
59. posterior inflated ventral cirri with narrow tips
1. short and button-shaped
2. tapering
3. digitiform
4. absent
These characters parallel the ones already characterized for
median setigers. In most species, the posterior ventral cirri lack
basal inflations; however, when inflated, the shape of the bases
is often different from that present in median setigers.
60. posterior ventral cirri
1. tapering
2. digitiform
3. short, nearly tubercular
4. broadly triangular, nearly scoop-shaped
61. anterior notopodial cirri
1. basally inflated
2. medially inflated
3. tapering
4. digitiform
5. clavate
62. median notopodial cirri
1. basally inflated
2. medially inflated
3. tapering
4. digitiform
5. clavate
63. posterior notopodial cirri
1. basally inflated
2. medially inflated
3. tapering
4. digitiform
5. clavate
These character states are listed in the same order for all three
regions of the body; both outgroup species have character state
1 throughout the body. In most species, the notopodial cirri
differ in shape from one end of the body to the other.
64. notopodial cirri
1. articulated throughout body
2. articulated in anterior setigers
3. without articulations
Both outgroup species have character state 3. Notopodial cirri
are rarely articulated in species without articulated ccratostylcs;
most species with articulated notopodial cirri have articulations
limited to the anterior end, usually about the first 20 setigers in
a specimen with 100-120 setigers.
Pectinate Setae
65. anterior pectinate setae
1. furled
2. flat
66. anterior pectinate setae
1. distally tapering
2. distally flaring
67. median and posterior pectinate setae
1. furled
2. flat
68. median and posterior pectinate setae
1. distally tapering
2. distally flaring
Onuphids often have narrow, furled, tapering pectinate setae
with relatively few teeth in anterior setigers and wider, flaring
pectinate setae in median and posterior setigers. A similar
pattern can be found in some eunicids, but most of them appear
to have similar pectinate setae in anterior and posterior setigers.
The median and posterior pectinate setae appear to differ in a
few cases, but documentation is difficult because these setae
are small and are often broken in posterior setigers where the
limbate setae, which protect pectinate setae in anterior setigers,
are few in number or absent.
Falcigers and Spinigers
Compound falcigers differ a great deal in shape from anterior
to posterior end and from superior to inferior positions in a
single fascicle. The differences are mainly in the length and
shape of the appendages, but the shafts may also change along
the length of the body. In addition to the characters scored here,
these shape differences should be consulted for additional
characterizations of the different species.