A new species and nine new records of Syllidae (Annelida) from the Socotra Archipelago (Indian Ocean)
Author
Rodríguez, Yolanda Lucas
Author
Martín, Guillermo San
Author
Fiege, Dieter
text
Zootaxa
2019
2019-08-05
4651
2
235
258
journal article
26091
10.11646/zootaxa.4651.2.2
1184b85a-5699-4722-968e-58834f3c1273
1175-5326
3363175
A90D52DC-727E-4723-B205-47B3C4F0C3A7
Odontosyllis polycera
(
Schmarda, 1861
)
Figure 10
Syllis polycera
Schmarda, 1861: 72
, pl. 28, fig. 219.—
Augener, 1927: 152
.—
Day, 1967: 260
, fig. 12.—
Hutchings & Murray,
1984: 32.—
Hartmann-Schröder, 1984: 20
;
1985: 68
, figs. 14–17; 1986: 41; 1989: 25; 1990: 51.
?
Odontosyllis suteri
non
Benham, 1915
.—
Haswell, 1920: 107
.
Odontosyllis polycera
San Martín & Hutchings, 2006: 58
, figs. 19A, B, 25E, F, 35A–F, 36A–F.
Material examined
Socotra
,
Qataninh Bay
,12º21’293N 53º32’659E, under stones and coral rubble,
8–11 m
,
09.04.2000
,
1 specimen
broken in three pieces (including 3 permanent slides with pharynx and proventricle dissected) (
SMF
24991)
.
Description.
Body broad, with short, compressed segments. Specimen complete, broken in three pieces, about 142 chaetigers, pygidium present, probably in regeneration. Body white to yellowish in alcohol, without colour pattern,
24.5 mm
long,
1.08 mm
wide. Dorsally convex, ventrally more or less flattened. Prostomium oval, with two pairs of large, dark purple eyes in open trapezoidal arrangement; antennae short, small. Palps fused, bent ventrally. Dorsal tentacular cirri slightly longer than antennae, similar in length to body width, ventral tentacular cirri distinctly shorter than dorsal ones. Peristomium compressed, covered with a large occipital flap covering almost all prostomium. Antennae, tentacular, and dorsal cirri long, smooth to rugose. Dorsal cirri alternating long and short, becoming shorter posteriorly; long dorsal cirri in midbody slightly shorter than body width, short dorsal cirri approximately half the length of long ones; long dorsal cirri on most anterior segments slightly longer than body width. Ventral cirri shorter than parapodial lobes, globular and tough (
Fig. 10C
). Compound chaetae similar along body, with spinose shafts, blades short, thick, hooked, bidentate, teeth well separate. Short spines on margin and thin spines in tendon (
Fig. 10A
). Marked dorso-ventral gradation in size, being shorter dorsally and becoming longer as more ventral (
Fig. 10A, C
); most dorsal blades with both teeth very similar, remaining blades with short, small proximal tooth. Median blades about 9–28 μm, approximately 12 chaetae in midbody fascicle. Midbody parapodia with three slender aciculae two of them with rounded tip and smallest with trilobed tip (
Fig. 10B
). Pharynx short, through about five segments,
0.75 mm
long,
0.6 mm
wide with 5 teeth and 2 lateral plates (
Fig. 8D
). Proventricle
2.5 mm
long, 0.8 wide, with 70 rows of muscular cells (
Fig. 8D
).
Remarks.
This species has been reported in many different areas of the world (see below) at different depths (
San Martín & Hutchings 2006
). Molecular studies should be conducted to understand the variability and distribution of this species. The specimen under study presents oocytes in midbody parapodia (
Fig. 10C
, arrows).
Habitat.
Occurring in sand, mud, algae, calcareous substrata, bryozoans, sponges, from intertidal to
90 m
(
San Martín & Hutchings 2006
). Under stones and coral rubble in the intertidal.
Distribution.
Angola
,
Namibia
,
South Africa
,
USA
(Southern
California
),
Panamá
, Indo-Pacific,
New Zealand
,
Australia
(
Queensland
,
New South Wales
,
Tasmania
,
South Australia
,
Western Australia
) (
San Martín & Hutchings, 2006
).