Parexogone campoyi San Martín, Ceberio & Aguirrezabalaga, 1996

Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos & Fukuda, Marcelo Veronesi, 2017, Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic, Zootaxa 4221 (4), pp. 401-430 : 408-411

Parexogone campoyi San Martín, Ceberio & Aguirrezabalaga, 1996

Figures 4–6

Exogone (Parexogone) campoyi San Martín et al., 1996: 252 –253, Figs. 4–5 ; San Martín 2003: 244, Figs. 131–132.

Material examined. Project ‘ Oceanprof '’. 22°39’44.28”S, 40°15’44.41”W, 0–2 cm, 994 m deep: 1 spec. (MNRJP 1160), 19 May 2002; 22°43’17.37”S, 40°12’12.34”W, 2–5 cm, 1157 m deep: 1 spec. (MNRJP 1161), 15 May 2002; 22°10’53.4”S, 39°52’18.3”W, 0–2 cm, 1039 m deep: 1 spec. (MNRJP 1162), 0 1 Jul 2003; 22°11’04.39”S, 39°47’04.64”W, 0–2 cm, 1654 m deep: 1 spec. (MNRJP 1163), 25 Nov 2002; 22°11’16.63”S, 39°43’44.72”W, 0–2 cm, 1964 m deep: 1 spec. (MNRJP 1164), 25 Nov 2002; 21°57’15.5”S, 39°47’41.7”W, 2–5 cm, 1857 m deep: 1 spec. (MNRJP 1165), 28 Jun 2003; 21°52’59.2”S, 39°55’32.2”W, 0–2 cm, 751 m deep: 1 spec. (MNRJP 1166), 29 Jun 2003; 22°31’11.8”S, 40°15’12.1” W, 0–2 cm, 743 m deep: 1 spec. (MNRJP 1167), 18 Jun 2003; 22°35’03.7”S, 40°08’52.5”W, 0–2 cm, 1043 m deep: 1 spec. (MNRJP 1168), 15 Jun 2003; 22°27’31.1”S, 40°09’23.5”W, 0–2 cm, 749 m deep: 1 spec. (MNRJP 1169), 18 Jun 2003; 22°34’05.0”S, 40°00’12.6”W, 0–2 cm, 1337 m deep: 1 spec. (MNRJP 1170), 15 Jun 2003; 22°37’02.9”S, 39°56’20.1”W, 0–2 cm, 1945 m deep: 1 spec. (MNRJP 1171), 13 Jun 2003;. Project ‘ HABITATS ’. 22°19’57”S, 40°1’59”W, 707 m deep: 1 spec., 7 Jul 2008; 22°36’27”S, 40°22’29”W, 700 m deep: 3 specs, 25 Jun 2008; 22°49’22”S, 40°8’17”W, 1864 m deep: 1 spec., 11 May 2008; 23°13’46”S, 40°55’56”W, 986 m deep: 1 spec., 8 May 2008; 23°15’11”S, 40°53’48”W, 1302 m deep: 3 specs, 9 May 2008. Project ‘ AMBES ’. 19°3’29”S, 37°48’39”W, 1302 m deep: 2 specs, 30 Jan 2012; 19°34’20”S, 38°41’19”W, 449 m deep: 5 specs, 30 Jun 2013; 19°40’8”S, 39°7’22”W, 1035 m deep: 23 specs, 13 Dec 2011; 19°50’1”S, 39°26’30”W, 1055 m deep: 6 specs, 11 Jan 2012; 19°53’31”S, 39°32’56”W, 1023 m deep: 22 specs, 13 Jan 2012; 19°58’11”S, 39°31’38”W, 1300 m deep: 4 specs, 13 Jan 2012; 20°16’35”S, 38°27’18”W, 1902 m deep: 1 spec., 21 Dec 2011; 20°36’2”S, 39°51’35”W, 1000 m deep: 8 specs, 8 Jan 2012; 20°36’42”S, 39°49’25”W, 1333 m deep: 6 specs, 8 Jan 2012; 21°4’43”S, 40°8’31”W, 1023 m deep: 11 specs, 30 Dec 2011; 21°4’51”S, 40°4’14”W, 1300 m deep: 7 specs, 31 Dec 2011.

Description. Body filiform, longest specimen examined 4 mm long, 0.2 mm wide, with 39 chaetigers. Palps subpentagonal, totally fused, distally pointed ( Figs. 4 A, J; 5A–D). Prostomium ovate, with two pairs of eyes in trapezoidal arrangement; antennae inserted slightly separated from each other, approximately between posterior eyes; lateral antennae digitiform, reaching chaetiger 2, if directed posteriorly; median antenna about twice as long as lateral ones, reaching beyond tips of palps and chaetiger 4, if directed posteriorly ( Fig. 4 A). Peristomium shorter than subsequent segments, peristomial cirri ovate, shorter than lateral antennae ( Figs 4 A, J; 5B). Dorsal cirri digitiform, longer than peristomial cirri but shorter than lateral antennae, progressively thinner towards posterior body ( Figs 4 A; 5A–B); ventral cirri similar to dorsal cirri but slightly shorter ( Fig. 5 C–D). Anterior parapodia with 9–15 compound chaetae each, midbody with 5–7, posterior parapodia with 3–4 compound chaetae each; compound chaetae with smooth to slightly spinulated shafts, blades unidentate to sub-bidentate, with relatively coarse spines and conspicuous dorso-ventral gradation in length ( Figs 4 F–I, K–L; 6A–E); blades 60–10 µm long on anterior body parapodia, 80–10 µm on midbody and 50–10 µm on posterior body parapodia. Dorsal simple chaetae present from midbody onwards, subdistally spinulated, sub-bidentate with acute, needle-like tip ( Figs 4 B; 6F–G); ventral simple chaetae only present on posterior chaetigers, slightly spinulated, sub-bidentate ( Fig. 4 C). Anterior body parapodia with 2 aciculae each, subdistally inflated, with sharp, acute, needle-like tip; from midbody onwards, single acicula per parapodium, with similar shape ( Fig. 4 D–E). Pygidium with 1 pair of thin, elongate anal cirri, longer than posterior dorsal cirri and median antenna. Pharynx through 3 chaetigers, with conical tooth close to anterior border; proventricle extending for 5 chaetigers, with ca. 15–17 rows of muscle cells ( Fig. 4 A).

Remarks. Brazilian specimens match the original description of P. campoyi in all characters.

Geographic distribution and bathymetric range. Atlantic Ocean—Bay of Biscay (type locality), 1000–1100 m deep ( San Martín et al. 1996); North Sea—UK, Tynemouth ( San Martín & Worsfold 2015). Brazilian specimens were collected from 743–1964 m deep.

Figures

FIGURE 4. Parexogone campoyi. (A, J) anterior body, dorsal view; (B) dorsal simple chaeta; (C) ventral simple chaeta; (D – E) aciculae, anterior and posterior body chaetigers, respectively; (F – I, K – L) falcigers, midbody chaetigers.

FIGURE 5. Parexogone campoyi, SEM. (A) entire worm (posteriorly incomplete, broken); (B – C) anterior body, dorsal and ventral views, respectively; (D) close up of the oral area.

FIGURE 6. Parexogone campoyi, SEM. (A – B) parapodia, anterior body chaetigers; (C) falcigers, anterior body chaetigers; (D – E) parapodia and falcigers, midbody chaetigers; (F – G) dorsal simple chaetae, midbody chaetigers.