New species of <i>Sphaerosyllis</i> Claparède, 1863 (Annelida: Syllidae: Exogoninae) from Rio de Janeiro (Brazil)

A new syllid species belonging to the genus Sphaerosyllis ( Claparède, 1863Claparède, A. R. É. 1863. Beobachtungen über Anatomie und Entwicklungsgeschichte wirbelloser Thiere: an der Küste von Normandie angestellt. Verlag von Wilhelm Engelmann, Leipzig. ) was found in Southeast Brazil during the development of the project “Environmental, social and economic susceptibility of Ilha Grande Bay to spillage and the presence of oil at sea.” Hence, this paper contains its morphological description, obtained after careful examination of several specimens under light and scanning electron microscopy. The new species can be diagnosed by the presence of intersegmental brown stripes along all body segments, fused palps for most of its length, a prostomium semicircular with three antennae, one simple dorsal chaeta, one simple ventral chaeta and 3–4 falcigers bearing unidentate blades. Finally, an identification key and a comparative table are provided for all the species formally recorded in Brazil to date.

Keywords:
Biomonitoring; Benthic Macrofauna; Angra dos reis; Shallow waters; Syllidae

Authorship

Namy Ogawa ^** Corresponding author: namy.ogawa@gmail.com

Conceptualization

Formal Analysis

Investigation

Writing – Original Draft

Writing – Review & Editing

Departamento de Zoologia – Universidade do Estado do Rio de Janeiro (Rua São Francisco Xavier, 524 – Maracanã – RJ – Brazil – 20.550-013)Universidade do Estado do Rio de JaneiroBrazilMaracanã, RJ, BrazilDepartamento de Zoologia – Universidade do Estado do Rio de Janeiro (Rua São Francisco Xavier, 524 – Maracanã – RJ – Brazil – 20.550-013)

http://orcid.org/0000-0003-4629-297X

Samuel Lucas da Silva Delgado Mendes

Conceptualization

Formal Analysis

Investigation

Writing – Original Draft

Writing – Review & Editing

Programa de Pós-graduação em Zoologia – Museu Nacional – Universidade do Estado do Rio de Janeiro (Quinta da Boa Vista – RJ –Brazil – 20.940-040)Universidade do Estado do Rio de JaneiroBrazilQuinta da Boa Vista, RJ, BrazilPrograma de Pós-graduação em Zoologia – Museu Nacional – Universidade do Estado do Rio de Janeiro (Quinta da Boa Vista – RJ –Brazil – 20.940-040)

http://orcid.org/0000-0003-4894-3270

Gabriela Siqueira

Methodology

http://orcid.org/0009-0009-5247-9846

Alexandra Rizzo

Funding Acquisition

Project Administration

Resources

Writing – Review & Editing

http://orcid.org/0000-0001-5056-5358

^* Corresponding author: namy.ogawa@gmail.com

Associate Editor: Maikon Di Domenico

Di Domenico, M.; Andriguetto-Filho, J.M. and Lopes, R.M. (Eds)

SCIMAGO INSTITUTIONS RANKINGS

Figures

Figures (3)

Thumbnail

Figure 1.
Sphaerosyllis lanai sp. nov. (Holotype, UERJ 8586): Anterior end, dorsal view (A). Parapodium and chaetae on anterior body (B). Parapodium and chaetae on mid-body (C). Parapodium and chaetae on posterior body (D). Falciger dorso-ventral gradation in anterior chaetigers (E). Falciger dorso-ventral gradation in mid-body chaetigers (F). Falciger dorso-ventral gradation in posterior chaetigers (G). Dorsal simple chaetae (H). Ventral simple chaetae (I). Aciculum distally bent at a right angle (J). Abbreviations: Ac = Aciculum; Ct = Tentacular cirri; dSC = Dorsal simple chaeta; La = Lateral antenna; Ma = Median antenna; Pal = Palps; Ph = Pharynx; Pv = Proventriculus; To = Tooth; vSC = Ventral simple chaeta. Scale bar: A = 100 µm; B, C, D = 18 µm; E = 16 µm; F = 12 µm; G = 10 µm; H, I, J = 14 µm.

Thumbnail

Figure 2.
Sphaerosyllis lanai sp. nov. under Scanning Electron Microscopy. Anterior end, dorsal view (A). Dorsal cirri (B). Ventral simple chaetae from anterior chaetiger (C). Dorsal view of chaetigers 1-4 in detail (D). Mid-body, dorsal view (E). Posterior end (F). Abbreviations: dSC = Dorsal simple chaeta; Fa = Falciger; iS = Instersegmental stripes; Pa = papillae; Pc = Pygidial cirri; Pp = Pygidial papila; vSC = Ventral simple chaetae. Scale bar: A = 30µm; B = 5 µm; C = 6 µm; D = 10 µm; E = 85 µm; F = 60 µm.

Thumbnail

Figure 3.
SEM and Optical microscopy plate of Sphaerosyllis lanai sp. nov. focusing on the anterior region in dorsal view and falciger gradation from the anterior to the posterior chaetigers. Position, size, and shape of prostomium antennae and tentacular cirri; the median antenna is easily missed, but its insertion is conspicuously represented on the posterior margin of the prostomium with the aid of the SEM (A). Transition in the quantity of papillae in the anterior region of the body and the presence of secondary annuli in each chaetiger (B). Prostomium, focusing on the position of the lateral and median antennae under optical microscopy (C). Anterior chaetigers in dorsal view (D). Midbody chaetigers in ventral view (E). Dorso-ventral gradation of falcigers blades length in the anterior chaetiger (F). Posterior body chaetiger in ventral view (G). Posterior body chaetiger in dorsal view (H). Abbreviations: Ac= aciculum; dSC = Dorsal simple chaetae; Fa = Falciger; La = Lateral antenna; Ma = Median antenna insertion; Pal= Palp; Pap = Papillae; PapR = Papillated region; Tc = Tentacular cirri; vC = Ventral cirri; vSC = Ventral simple chaetae. Scale bar: A = 20 µm; B = 100 µm; C = 17µm; D = 24µm; E = 20µm; F = 16µm; G = 17µm; H = 10µm.

Figure 1. Sphaerosyllis lanai sp. nov. (Holotype, UERJ 8586): Anterior end, dorsal view (A). Parapodium and chaetae on anterior body (B). Parapodium and chaetae on mid-body (C). Parapodium and chaetae on posterior body (D). Falciger dorso-ventral gradation in anterior chaetigers (E). Falciger dorso-ventral gradation in mid-body chaetigers (F). Falciger dorso-ventral gradation in posterior chaetigers (G). Dorsal simple chaetae (H). Ventral simple chaetae (I). Aciculum distally bent at a right angle (J). Abbreviations: Ac = Aciculum; Ct = Tentacular cirri; dSC = Dorsal simple chaeta; La = Lateral antenna; Ma = Median antenna; Pal = Palps; Ph = Pharynx; Pv = Proventriculus; To = Tooth; vSC = Ventral simple chaeta. Scale bar: A = 100 µm; B, C, D = 18 µm; E = 16 µm; F = 12 µm; G = 10 µm; H, I, J = 14 µm.

Figure 2. Sphaerosyllis lanai sp. nov. under Scanning Electron Microscopy. Anterior end, dorsal view (A). Dorsal cirri (B). Ventral simple chaetae from anterior chaetiger (C). Dorsal view of chaetigers 1-4 in detail (D). Mid-body, dorsal view (E). Posterior end (F). Abbreviations: dSC = Dorsal simple chaeta; Fa = Falciger; iS = Instersegmental stripes; Pa = papillae; Pc = Pygidial cirri; Pp = Pygidial papila; vSC = Ventral simple chaetae. Scale bar: A = 30µm; B = 5 µm; C = 6 µm; D = 10 µm; E = 85 µm; F = 60 µm.

Figure 3. SEM and Optical microscopy plate of Sphaerosyllis lanai sp. nov. focusing on the anterior region in dorsal view and falciger gradation from the anterior to the posterior chaetigers. Position, size, and shape of prostomium antennae and tentacular cirri; the median antenna is easily missed, but its insertion is conspicuously represented on the posterior margin of the prostomium with the aid of the SEM (A). Transition in the quantity of papillae in the anterior region of the body and the presence of secondary annuli in each chaetiger (B). Prostomium, focusing on the position of the lateral and median antennae under optical microscopy (C). Anterior chaetigers in dorsal view (D). Midbody chaetigers in ventral view (E). Dorso-ventral gradation of falcigers blades length in the anterior chaetiger (F). Posterior body chaetiger in ventral view (G). Posterior body chaetiger in dorsal view (H). Abbreviations: Ac= aciculum; dSC = Dorsal simple chaetae; Fa = Falciger; La = Lateral antenna; Ma = Median antenna insertion; Pal= Palp; Pap = Papillae; PapR = Papillated region; Tc = Tentacular cirri; vC = Ventral cirri; vSC = Ventral simple chaetae. Scale bar: A = 20 µm; B = 100 µm; C = 17µm; D = 24µm; E = 20µm; F = 16µm; G = 17µm; H = 10µm.

How to cite

copy

Instituto Oceanográfico da Universidade de São Paulo Praça do Oceanográfico 191, CEP: 05508-120, São Paulo, SP - Brasil, Tel.: (11) 3091-6501 - São Paulo - SP - Brazil
E-mail: diretoria.io@usp.br

Acompanhe os números deste periódico no seu leitor de RSS

Versão para download de PDF

PDF

Inglês

Versões e tradução automática

Versão original do texto

English

Tradução automática

Google Translator
Microsoft Translator

Como citar

RIS

BIBTEX

Outros formatos de citação e exportação:

SciELO - Scientific Electronic Library Online
Rua Dr. Diogo de Faria, 1087 – 9º andar – Vila Clementino 04037-003 São Paulo/SP - Brasil
E-mail: scielo@scielo.org

Leia a Declaração de Acesso Aberto

Métricas

New species of <i>Sphaerosyllis</i> Claparède, 1863 (Annelida: Syllidae: Exogoninae) from Rio de Janeiro (Brazil)

PlumX

Mensagem

[1] ^* Corresponding author: namy.ogawa@gmail.com