Phyllodoce (Ushakov 1972)
- Dataset
- Ten new species of Phyllodoce Lamarck, 1818 (Phyllodocidae, Annelida) from Brazil
- Rank
- GENUS
Classification
- kingdom
- Animalia
- phylum
- Annelida
- class
- Polychaeta
- order
- Phyllodocida
- family
- Phyllodocidae
- genus
- Phyllodoce
description
Description. Specimens with length ranging from 2 – 7 mm, 0.5 mm wide at median part of body, including parapodia and excluding chaetae and for 27 – 40 segments. Body long, dorso-ventrally flattened and tapered posteriorly. Prostomium oval to rounded, longer than wide, with anterior protuberance and posterior expansion, where nuchal papilla situated (Fig. 35 A). Paired frontal antennae and palps cylindrical and short with similar lengths (Fig. 35 A). Antennae and palps with 1 / 4 of prostomial length (Fig. 35 A). Eyes absent. Proboscis observed through dissection, basally with longitudinal row of four sclerotized cusp-shaped papillae on each side; papillae large, tough, similar to teeth, surrounded by conical papillae obliquely distributed, and separated by non-papillated median-dorsal and median-ventral areas (Fig. 35 B – C); distal, with six longitudinal rows of prominent tubercles. Terminal ring with 17 oval papillae. Segment 1 not visible dorsally. Four pairs of cylindrical tentacular cirri, biarticulated, with short cirrophores and long cirrostyles, situated on first three segments. Tentacular cirri of segment 1, reaching segment 5. Dorsal and ventral tentacular cirri of segment 2 reaching segments 8 and 3, respectively. Dorsal tentacular cirri of segment 3 reaching segment 7. Neuropodia with chaetae from segment 2. Dorsal cirri from segment 4, symmetrical, with well-developed cirrophores and lacking dorsal expansions. Dorsal cirri of anterior segments oval to elongated and those from median and posterior segments rounded. Parapodial lobes shorter than ventral cirri, with light brown median aciculae and bundles of chaetae. Prechaetal lobes bilobated, symmetrical and rounded (Fig. 36 A – D). Ventral cirri from segment 3, horizontally oriented in relation to lobes, asymmetrical and dorso-ventrally flattened; cirri from anterior segments rounded with tapered distal ends and from median and posterior segments slender and elongated (Fig. 36 A – D). Compound spinigerous chaetae from segment 2. Rostrum of chaetal shaft surrounded by several denticles; articles with serrated outer edges. Pygidium with a pair of cylindrical anal cirri with inflated bases (Fig. 36 E – F). Colour. Preserved animals show opaque pigmentation with discrete brown colour in prostomium and parapodial cirri. Habitat. Sublittoral sandy substrates at 49 m.
description
Figure 35 – 36
diagnosis
Diagnosis. Prostomium oval to rounded with accentuated anterior protuberance. Posterior prostomial region expanded with a nuchal papilla. Anal cirri cylindrical with inflated bases.
discussion
Remarks. Phyllodoce sp. B. differs from P. lamella sp. nov. because the latter presents cylindrical ventral tentacular cirri with lateral lamellae. It also differs from P. micrognatha sp. nov. by the median-dorsal cirri that are subrectangular with rounded edges and rounded in P. ovalis sp. nov. The species P. tamoya sp. nov., P. tupana sp. nov. and P. bipapillosa sp. nov. can be readily distinguished from Phyllodoce sp. B by the presence of cordiform dorsal cirri from anterior segments.
distribution
Distribution. Atlantic Ocean; Brazil: Margin of the continental shelf in the Campos Basin – Brazil.
materials_examined
Material examined. Two individuals. Margin of continental shelf in the Campos Basin, Brazil, Hab 13 Foz 23 R 1, 22 º 1 ’ 9.9 ” S 40 º 31 ’ 54.4 ” W, 49 m, 12 Mar 2009 (ZUEC – POL 16531); Hab 13 Foz 23 R 1, 22 º 1 ’ 9.9 ” S 40 º 31 ’ 54.4 ” W, 49 m, 12 Mar 2009 (ZUEC – POL 16532), Brazil.