Phyllodoce ovalis, Oliveira & Magalhães & Lana, 2021

Oliveira, Verônica Maria De, Magalhães, Wagner F. & Lana, Paulo Da Cunha, 2021, Ten new species of Phyllodoce Lamarck, 1818 (Phyllodocidae, Annelida) from Brazil, Zootaxa 4924 (1), pp. 1-61: 37-38

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Phyllodoce ovalis

sp. nov.

Phyllodoce ovalis   sp. nov.

Figure 27 View FIGURE 27

Holotype. Atlantic Ocean , Margin of continental slope in Campos Basin , Brazil, Hab 9 Cang 9 R1, 21º54’43.7”S 39º50’33.0”W, 1,320 m, 11 Feb 2009 ( ZUEC–POL 16530). GoogleMaps  

Paratypes A total of 15 paratypes, length 5.1± 2.3 mm for 47.3± 16.6 segments. Continental slope in Campos Basin: Hab 9 I08   R1, 21º11’4.5”S 40º8’58.4”W, 993 m, 2 Mar 2009 (1 Paratype, NHDM–865955) GoogleMaps   ; Hab3 A08 R2, 23º41’10.2”S 41º16’7.9”W 986 m, 3 May 2009 (1 Paratype, NHDM–865956) GoogleMaps   ; AMBES11   F09 R3, 20º29’3.8”S 38º23’18.5”W, 2,507 m, 13 Jun 2013 (1 paratype, ZUEC–POL 18555) GoogleMaps   ; AMBES11 GoogleMaps   F08 R2, 20º16’38.1”S 38º27’26.5”W, 1.904 m, 14 Jun 2013 (4 paratypes, ZUEC–POL 18587) GoogleMaps   ; AMBES12 GoogleMaps   E07 R2, 19º47’2.4”S 39º3’14.6”W, 16 Jun 2013 (3 paratypes, ZUEC–POL 18599) GoogleMaps   ; AMBES12 GoogleMaps   CANWN5   R2, 19º33’22.1”S 39º2’36.0”W, 414 m, 25 Jun 2013 (1 paratype, ZUEC–POL 18585) GoogleMaps   ; AMBES12 GoogleMaps   E06 R2, 19º40’1.4”S 39º7’21.9”W, 1.050 m GoogleMaps   , 26 Jun 2013 (1 paratype, ZUEC–POL 18588); AMBES12   E06 R3, 19º40’1.4”S 39º7’21.9”W, 1.050 m, 26 Jun 2013 (1 paratype, ZUEC–POL 18598) GoogleMaps   ; AMBES12 GoogleMaps   CNWN6   R1, 19º53’27.2”S 39º32’59.8”W, 970 m, 28 Jun 2013 (1 paratype, ZUEC–POL 18553) GoogleMaps   ; AMBES12 GoogleMaps   F05 R2, 19º34’20.4”S 38º41’19.8”W, 449 m, 30 Jun 2013 (1 paratype, ZUEC–POL 18586) GoogleMaps   , Brazil.

Diagnosis. Oval prostomium, frontal protuberance with antennae and palps. Antennae and palps with inflated bases. Nuchal papilla club-shaped. Tentacular cirri flattened and short. Segment 1 visible dorsally. Proboscis basally with six longitudinal rows of rounded papillae and distally with six longitudinal rows of prominent and pigmented tubercles.

Description. Holotype complete, 8.0 mm long, 0.5 mm wide at median part of body, including parapodia and excluding chaetae for 59 segments. Body long, cylindrical, dorso-ventrally flattened and tapered posteriorly. Prostomium oval with anterior protuberance, where antennae and palps located. Nuchal papilla club-shaped on posterior prostomial margin ( Fig. 27A View FIGURE 27 ). Paired frontal antennae and palps of similar lengths, dorso-ventrally flattened and cylindrical, short, robust and with inflated bases ( Fig. 27A View FIGURE 27 ). Antennae and palps with less than 1/4 of prostomial length ( Fig. 27B View FIGURE 27 ). Eyes absent. Proboscis basally with six longitudinal rows of rounded papillae. Distal region with six longitudinal rows of prominent and pigmented tubercles. Terminal ring not observed. Segment 1 visible dorsally. Four pairs of tentacular cirri flattened with inflated bases, biarticulated, with short cirrophores and long cirrostyles, situated of first three segments. Tentacular cirri of segment 1 reaching segment 3. Dorsal and ventral tentacular cirri of segment 2 reaching segments 3 and 2, respectively. Dorsal tentacular cirri of segment 3 reaching segment 2. Neuropodia from segment 2. Dorsal cirri symmetrical, oval to rounded, inflated from segment 4 with well-developed cirrophores and without dorsal expansions. Parapodial lobes shorter than dorsal and ventral cirri with aciculae and bundles of chaetae. Prechaetal lobes bilobate, symmetrical, and rounded ( Fig. 27 View FIGURE 27 C–D). Postchaetal lobes rounded. Ventral cirri horizontally oriented in relation to lobes, symmetrical and rounded ( Fig. 27 View FIGURE 27 C–D). Compound spinigerous chaetae from segment 2. Rostrum of chaetal shaft surrounded by several denticles, with a pair of main conical teeth; articles with serrated outer edges ( Fig. 27E View FIGURE 27 ). Pygidium not observed.

Colour. Preserved animals show dorso-lateral black pigmentation in the prostomium and dark brown pigmentation in the anterior segments and parapodia ( Fig. 27 View FIGURE 27 A–C).

Habitat. Substrate composed of silt between 986 and 3.016 m.

Geographical Distribution. Atlantic Ocean, Brazil: Continental shelf and slope in Campos Basin.

Etymology. The Latin words ovalis   refers to oval-shaped parapodial cirri present in this species.

Remarks. Phyllodoce ovalis   sp. nov. differs from other closely related species by having antennae, palps, and tentacular cirri with inflated bases. The club-shaped nuchal papilla is a unique character of this species. The oval and inflated dorsal and ventral cirri are similar to those of the genera Mystides   and Pseudomystides   , and have not been reported for other species of Phyllodoce   . The oval prostomium is a character shared with some species recorded for Sige   and also not previously reported in Phyllodoce   . The absence of eyes is a character shared with the Brazilian species P. concava   sp. nov., P. lamella   sp. nov., and Phyllodoce   sp. B. and it seems to be common to species collected in slope depths. Phyllodoce ovalis   sp. nov. presents segment 1 completely visible, character described for the genus but not observed in other species described and recorded in this study.