Branchiosyllis gonzaguinhai, Nascimento & Fukuda & Paiva, 2019

Nascimento, Rodolfo Leandro, Fukuda, Marcelo Veronesi & Paiva, Paulo Cesar De, 2019, Two new sponge-associated Branchiosyllis (Annelida: Syllidae: Syllinae) from Northeastern Brazil, Zootaxa 4568 (2), pp. 307-322: 313-320

publication ID

https://doi.org/10.11646/zootaxa.4568.2.6

publication LSID

lsid:zoobank.org:pub:0BC795AD-00AE-4B61-82F8-57A912552497

persistent identifier

http://treatment.plazi.org/id/3B61EB1F-FF90-FF98-CDB3-3FC6F675FE28

treatment provided by

Plazi

scientific name

Branchiosyllis gonzaguinhai
status

sp. nov.

Branchiosyllis gonzaguinhai   sp. nov.

Figures 6–8 View FIGURE 6 View FIGURE 7 View FIGURE 8 ; Table 3

Type series. Holotype ( MNRJP 1912): Atlantic Ocean, Brazil, state of Pernambuco, Fernando de Noronha Island, Buraco da Raquel (3°50’11”S, 32°24’ 34”W), 1 m depth, on Plakortis insularis   , coll. R. Nascimento, 21. April. 2016 GoogleMaps   . Paratypes: Atlantic Ocean, Brazil, state of Rio Grande do Norte, Rocas Atoll, Piscina das Tartarugas (3°52’20.5”S, 33°48’31.4”W), 1 m depth, on sponges GoogleMaps   : Paratype 1 ( MZUSP 3533 View Materials ), coll. 21. Oct. 2000; Canal da Barretinha (3°51’35.3”S, 33°49’04.6”W), 1 m depth, on sponges GoogleMaps   : Paratype 2 ( MZUSP 3534 View Materials )   , Paratype 3 ( MNRJP 1913), coll. 10. Oct. 2000; state of Pernambuco, Fernando de Noronha Island, Buraco da Raquel (3°50’11”S, 32°24’ 34”W), 1 m depth, on Aiolochroia crassa   GoogleMaps   : Paratype 4 ( MNRJP 1914)   , Paratype 5 mounted for SEM ( MNRJP 1983) coll. R. Nascimento, 21. April. 2016. Morphological data from specimens of the type series provided in Table 3   .

Description. Holotype complete, with 4.6 mm long, 0.40 mm wide, with 52 segments ( Figs 6A View FIGURE 6 ; 7A View FIGURE 7 ; Table 3). Longest specimen analyzed paratype 1 (MZUSP 3533), 6.6 mm long, 0.47 mm wide, with 55 segments ( Table 3). Subcylindrical to slightly flattened body ( Figs 6A View FIGURE 6 ; 7A View FIGURE 7 ; 8A View FIGURE 8 ). Holotype pigmented, dorsally with brownish spots on prostomium and dark spots on each side of the segments, close to bases of cirrophores ( Fig. 6A View FIGURE 6 ). Distally rounded palps fused only at bases ( Figs 6A, D View FIGURE 6 ; 7A View FIGURE 7 ; 8B View FIGURE 8 ). Prostomium subpentagonal to rectangular, with two pairs of eyes in trapezoidal arrangement ( Figs 6A View FIGURE 6 ; 7A View FIGURE 7 ); antennae inserted on anterior margin of prostomium; median antenna with 13–17 articles, lateral antennae with 13–17 articles each ( Figs 6A View FIGURE 6 ; 7A View FIGURE 7 ; 8A View FIGURE 8 ; Table 3). Nuchal organs as pair of densely ciliated rows dorso-laterally located on posterior border of prostomium ( Fig. 8C View FIGURE 8 ). Peristomium dorsally inconspicuous, covered by chaetiger 1 ( Figs 7A View FIGURE 7 ; 8C View FIGURE 8 ); dorsal peristomial cirri longer than median antenna, with 25–31 articles each ( Table 3); ventral peristomial cirri shorter than dorsal ones, with 12–15 articles each ( Table 3). Chaetiger 1 with dorsal projections as rounded swollen areas at bases of cirrophores, and a mid-dorsal, triangular projection over peristomium and prostomium ( Figs 7A View FIGURE 7 ; 8C View FIGURE 8 ). Dorsal cirri on chaetiger 1 with 18–25 articles each; on chaetiger 2 with 16–26, on chaetiger 3 with 26–36 articles, on chaetiger 4 with 15–20 articles, and on chaetiger 5 with 17–24 articles each; dorsal cirri slightly alternating in length in remaining chaetigers, longer cirri with up to 34 articles, shorter cirri with up to 20 articles ( Figs 6A View FIGURE 6 ; 7A View FIGURE 7 ; 8A View FIGURE 8 ). Ventral cirri digitiform, inserted at midlength of parapodial lobes, not reaching tip of parapodial lobes ( Figs 6C View FIGURE 6 ; 8B View FIGURE 8 ). Parapodia distally bilobate, pre-chaetal lobe larger than post-chaetal one, both digitiform ( Fig. 8G View FIGURE 8 ). A single branchia per parapodium, dorsally inserted, welldeveloped, multilobulated ( Fig. 8A View FIGURE 8 , D–F), with up to five lobes ( Fig. 8E View FIGURE 8 ), and granular appearance internally. Compound chaetae as ungulae only, regular falcigers absent; anterior body with 4–5 ungulae per parapodium; midbody with 4–6, posterior body with 4–6 ungulae per parapodium ( Table 3); ungulae with shafts subdistally slightly spinulated, shafts progressively thicker ventralwards throughout body ( Figs 7 View FIGURE 7 C–E; 8G, H); blades unidentate with dorsoventral gradation in length, ventralmost ungulae larger and thicker than dorsalmost ones throughout ( Figs 7 View FIGURE 7 C–E; 8H). Aciculae straight, with acute tip, progressively slightly thicker towards posterior body; anterior parapodia with two aciculae each ( Fig. 7F View FIGURE 7 ); midbody and posterior parapodia with only one acicula each ( Fig. 7G, H View FIGURE 7 ; Table 3), sometimes slightly protruding from parapodial lobes ( Figs 7 View FIGURE 7 F–H; 8H). Pygidium semicircular, with two articulated anal cirri approximately as long as posterior dorsal cirri (not considering cirri of growth region). Pharynx thinner than proventricle ( Figs. 6A View FIGURE 6 ; 7B View FIGURE 7 ), through 5–5.5 segments ( Table 3), with opening surrounded by 11 soft papillae ( Figs 6B, D View FIGURE 6 ; 8B View FIGURE 8 ); conical pharyngeal tooth close to anterior border ( Fig. 7B View FIGURE 7 ). Proventricle through 4–5 segments, with 21–24 rows of muscle cells ( Fig. 7B View FIGURE 7 ; Table 3).

Variation. Branchiosyllis gonzaguinhai   sp. nov. shows some variation in pigmentation: the holotype has dark brown spots on prostomium and dorsally on each side of segments, in the bases of cirrophores; in some segments there is a thin and sparse line of these dark brown spots, however, in Paratype 1 (MZUSP 3533, there is only a thin and sparse line present. In Paratype 5 (MNRJ 1983), the median antenna is originated slightly posteriorly than lateral ones. The dorsal projection on first chaetiger is slightly shorter in some specimens analyzed. We consider these variations as intraspecific.

Remarks. Branchiosyllis gonzaguinhai   sp. nov. differs from all its congeners in having a pair of dorsal swollen areas close to bases of cirrophores on first chaetiger ( Fig. 8A, C View FIGURE 8 ), however, the new species herein described resembles B. lamellifera Verril, 1900   , B. pacifica Rioja, 1941   , and B. tamandarensis Paresque, Fukuda & Nogueira, 2016   by having multi-lobed branchiae and only ungulae on all parapodia ( Álvarez-Campos et al., 2012; Paresque et al., 2016).

Branchiosyllis tamandarensis   is the most similar species to B. gonzaguinhai   sp. nov. B. tamandarensis   has a yellowish to orange color, whereas B. gonzaguinhai   sp. nov. has dark brown spots dorsally, on each side of each segment ( Table 2). Furthermore, B. tamandarensis   presents wider bodies, branchiae with up to six lobes and median antenna inserted between or slightly anteriorly to anterior pair of eyes, whereas B. gonzaguinhai   sp. nov. has branchiae with up to five lobes and median antenna inserted in line with the lateral ones ( Table 2).

Branchiosyllis lamellifera   and B. pacifica   are larger and wider than B. gonzaguinhai   sp. nov. ( Table 2). Branchiosyllis   . lamellifera   and B. pacifica   have multilobed branchiae with up to three and four lobes respectively, whereas B. gonzaguinhai   sp. nov. has branchiae with up to five lobes ( Table 2). The species also differ in the number of ungulae, with B. gonzaguinhai   sp. nov. presenting comparatively more ungulae per parapodium on anterior and posterior body ( Table 2). B. gonzaguinhai   sp. nov. has both median and lateral antennae longer than B. pacifica   , and dorsal and ventral peristomial cirri longer than B. lamelifera   and B. pacifica ( San Martín et al. 2013)   . Finally, B. lamellifera   has pharynx and proventricle larger than B. gonzaguinhai   sp. nov. ( Table 2).

Holotype MNRJP   Paratype 1 MZUSP   Paratype 2 MZUSP 3534 View Materials   Paratype 3 MNRJP   Paratype 4 MNRJP   Paratype 5 MNRJP 1983   1912 3533 1913 1914

Number of chaetigers / 27 / 3.7 x 0.48 (incomplete) 39 / 4.5 x 0.50

Total length x width at 36 / 4.5 x 0.42 Whole body with dark

52 / 4.6 x 0.40 55 / 6.6 x 0.47 56 / 5.25 x 0.42 Whole body with dark

proventricle (mm) incomplete purple pigmentation. purple pigmentation

Mounted for SEM Length of pharynx

5 5.5 5.5 5 not visible not visible (chaetigers)

Length of proventricle

(chaetigers x number of 4 x 24 4 x 21 5 x 23 4.5 x 22 not visible not visible

muscle cell rows)

Number of articles

Median antenna 16 13 14 14 17 17

Lateral antennae 15, 13 16, 17 14, 14 13, lost lost, 14 13, 14

Dorsal peristomial cirri

25, 30 28, 29 31, 21 incomplete. 27, lost 26, 27 31, 30

(left, right)

Ventral peristomial

lost, 13 lost, 13 13, lost 15, 13 13, 13 12, 13

cirri (left, right)

Number of ungulae per

parapodium

Anterior body 4–5 4–5 4–5 4–5 4–5 4–5

Midbody 4–5 5–6 4–5 4–5 4–5 4–6

Posterior body 4–6 5-6 4–5 lost 4–5 lost

Number of aciculae per

parapodium

2 / 1–2/ 1 2 / 1–2/ 1 2 / 1–2/ 1 2 / 1–2/ lost 2 / 1–2/ 1 2 / 1–2 / lost (anterior/midbody/

posterior body)

Habitat. Species found in association with sponges. The holotype was collected in Plakortis insularis Moraes & Muricy, 2003   , and the paratype 4 in Aiolochroia crassa ( Hyatt, 1875)   from the Fernando de Noronha Island. The paratypes 1, 2, 3 and 5, from Rocas Atoll, were “on and within sponges”, without more information about these sponges. Moraes (2011) reported both Plakortis insularis   and Aiolochroia crassa   from Rocas Atoll.

Distribution. South Atlantic, Brazil: states of and Pernambuco (Fernando de Noronha Island) and Rio Grande do Norte (Rocas Atoll).

Etymology. Named after Luiz Gonzaga do Nascimento Júnior (stage name Gonzaguinha), a remarkable Brazilian popular songwriter and singer (22.Sept.1945 –29.April.1991) who has amazed and inspired generations with his talent, especially for his artistic production during the last period of military dictatorship in Brazil.

MZUSP

Museu de Zoologia da Universidade de Sao Paulo

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Phyllodocida

Family

Syllidae

Genus

Branchiosyllis

Loc

Branchiosyllis gonzaguinhai

Nascimento, Rodolfo Leandro, Fukuda, Marcelo Veronesi & Paiva, Paulo Cesar De 2019
2019
Loc

B. gonzaguinhai

Nascimento & Fukuda & Paiva 2019
2019
Loc

B. gonzaguinhai

Nascimento & Fukuda & Paiva 2019
2019
Loc

B. gonzaguinhai

Nascimento & Fukuda & Paiva 2019
2019
Loc

B. gonzaguinhai

Nascimento & Fukuda & Paiva 2019
2019
Loc

B. gonzaguinhai

Nascimento & Fukuda & Paiva 2019
2019
Loc

B. pacifica ( San Martín et al. 2013 )

San Martin 2013
2013
Loc

B. pacifica

Rioja 1941
1941
Loc

B. pacifica

Rioja 1941
1941
Loc

B. pacifica

Rioja 1941
1941
Loc

Branchiosyllis lamellifera

Verrill 1900
1900
Loc

lamellifera

Verrill 1900
1900
Loc

B. lamellifera

Verrill 1900
1900
Loc

Branchiosyllis

Ehlers 1887
1887