An overview of the occurrences of <i>Exogone</i> (Annelida, Syllidae) in Brazil, with the description of a new species

Fukuda, Marcelo V.; Ribeiro, William M. G.; Rossi, Raphaela H. C.; Nogueira, João M. M.

doi:10.1590/2675-2824072.23161

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Original Article • Ocean Coast. Res. 72 (suppl 1) • 2024 • https://doi.org/10.1590/2675-2824072.23161 linkcopy

An overview of the occurrences of Exogone (Annelida, Syllidae) in Brazil, with the description of a new species

Authorship SCIMAGO INSTITUTIONS RANKINGS

Syllidae is one of the largest families of polychaete annelids, with more than 1,100 described species, comprehending relatively small-bodied, errant animals. Among these, specimens of Exogone can be relatively common in certain areas and substrates, figuring as an important component of the fauna in many locations. In Brazil, 13 species of this genus have been reported, but in some cases with records difficult to confirm/reject. Herein we present an overview of the known diversity of the genus for the country, with additional four new occurrences for the Brazilian coast that were previously only registered in the 'grey literature', and an identification key to the species currently identified along the Brazilian coast; also, we bring the description of Exogone paulolanai sp. nov., raising to 18 the number of Exogone species for the country.

Keywords:
‘Polychaeta’; Species description; Brazilian fauna; New occurrence

Authorship

person Marcelo V. Fukuda *

Conceptualization · Investigation · Project Administration · Funding Acquisition · Writing – original draft · Writing – review and editing

schoolUniversidade de São Paulo – Museu de Zoologia (Av. Nazaré, 481 – Ipiranga – São Paulo – SP – Brazil)Universidade de São PauloBrazilSão Paulo, SP, BrazilUniversidade de São Paulo – Museu de Zoologia (Av. Nazaré, 481 – Ipiranga – São Paulo – SP – Brazil)

0000-0002-7849-5563

person William M. G. Ribeiro

Writing – original draft · Writing – review and editing

0000-0002-2295-496X

person Raphaela H. C. Rossi

Writing – original draft · Writing – review and editing

0000-0002-8051-441X

person João M. M. Nogueira

Supervision · Resources · Project Administration · Funding Acquisition · Writing – review and editing

schoolUniversidade de São Paulo – Instituto de Biociências (R. do Matão, trav. 14, 101 – 05508-090 – Butantã – São Paulo – SP – Brazil)Universidade de São PauloBrazilSão Paulo, SP, BrazilUniversidade de São Paulo – Instituto de Biociências (R. do Matão, trav. 14, 101 – 05508-090 – Butantã – São Paulo – SP – Brazil)

0000-0002-8450-4294

person* Corresponding author:
emailmvfukuda@usp.br

Associate Editor:

Maikon Di Domenico

SCIMAGO INSTITUTIONS RANKINGS

Universidade de São Paulo – Museu de Zoologia (Av. Nazaré, 481 – Ipiranga – São Paulo – SP – Brazil)Universidade de São PauloBrazilSão Paulo, SP, BrazilUniversidade de São Paulo – Museu de Zoologia (Av. Nazaré, 481 – Ipiranga – São Paulo – SP – Brazil)

Universidade de São Paulo – Instituto de Biociências (R. do Matão, trav. 14, 101 – 05508-090 – Butantã – São Paulo – SP – Brazil)Universidade de São PauloBrazilSão Paulo, SP, BrazilUniversidade de São Paulo – Instituto de Biociências (R. do Matão, trav. 14, 101 – 05508-090 – Butantã – São Paulo – SP – Brazil)

Figures

Figures (9)

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Figure 1. Exogone aquadulcensis

Thumbnail

Figure 2. Exogone lourei

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Figure 3. Exogone marisae

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Figure 4. Exogone mompasensis . A, anterior body, dorsal view; B, compound chaetae, anterior body; C, compound chaetae, midbody; D, compound chaetae, posterior body; E, dorsal simple chaeta, anterior body; F, dorsal simple chaeta, posterior body; G, ventral simple chaeta, posterior body; H, aciculae, anterior body; I, acicula, posterior body. Scale bars A = 100 µm; B–I = 10 µm.

Thumbnail

Figure 5. Exogone mompasensis , SEM. A, anterior body, dorsal view; B, anterior body, ventral view; C, prostomium, peristomium, and chaetiger 1, dorsal view; D, prostomium, peristomium, and chaetiger 1, lateral view; E, pygidium, dorso-lateral view; F–G, spiniger-like chaetae, anterior to midbody; H–J, dorsalmost falcigers, anterior, mid- and posterior body, respectively; K, dorsal simple chaeta, midbody; L, ventral simple chaeta, posterior body. Scale bars: A = 50 µm; B = 25 µm; C–E = 20 µm; F–G, J–L = 2.5 µm; H–I = 2 µm.

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Figure 6. Exogone naidina . A, spiniger-like chaeta; B, falciger; C, dorsal simple chaeta; D, ventral simple chaeta; E, acícula. Scale bar = 10 µm.

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Figure 7. Exogone paulolanai sp. nov. A, anterior body, dorsal view; B, compound chaetae, anterior body; C, compound chaetae, midbody; D, compound chaetae, posterior body; E, dorsal simple chaeta, anterior body; F, dorsal simple chaeta, posterior body; G, ventral simple chaeta, posterior body; H, aciculae, anterior body; I, acicula, posterior body. Scale bars A = 100 µm; B–I = 10 µm.

Thumbnail

Figure 8. Exogone paulolanai sp . nov., SEM. A, anterior body, dorsal view; B, anterior body, ventral view; C, prostomium and peristomium, dorsal view; D, prostomium and peristomium, ventral view (pharynx everted); E, prostomium, frontal view (pharynx everted); F, anterior body, left lateral view. Scale bars: A, B = 50 µm; C, D = 20 µm; E, 10 µm; F, 30 µm.

Thumbnail

Figure 9. Exogone paulolanaisp . nov., SEM. A, tuft of cilia and peristomial cirrus (pc); B, pygidium, dorsal view; C, falciger, mid- to posterior body; D, spiniger-like chaeta, anterior body; E–F, chaetae, posterior body; G, dorsal simple chaeta, anterior to midbody; H, dorsal simple chaeta, posterior body. Scale bars: A, C, G, H = 2 µm; B = 10 µm; D = 5 µm; E, F = 3 µm.

imageFigure 1. Exogone aquadulcensis open_in_new

imageFigure 2. Exogone lourei open_in_new

imageFigure 3. Exogone marisae open_in_new

imageFigure 4. Exogone mompasensis . A, anterior body, dorsal view; B, compound chaetae, anterior body; C, compound chaetae, midbody; D, compound chaetae, posterior body; E, dorsal simple chaeta, anterior body; F, dorsal simple chaeta, posterior body; G, ventral simple chaeta, posterior body; H, aciculae, anterior body; I, acicula, posterior body. Scale bars A = 100 µm; B–I = 10 µm. open_in_new

imageFigure 5. Exogone mompasensis , SEM. A, anterior body, dorsal view; B, anterior body, ventral view; C, prostomium, peristomium, and chaetiger 1, dorsal view; D, prostomium, peristomium, and chaetiger 1, lateral view; E, pygidium, dorso-lateral view; F–G, spiniger-like chaetae, anterior to midbody; H–J, dorsalmost falcigers, anterior, mid- and posterior body, respectively; K, dorsal simple chaeta, midbody; L, ventral simple chaeta, posterior body. Scale bars: A = 50 µm; B = 25 µm; C–E = 20 µm; F–G, J–L = 2.5 µm; H–I = 2 µm. open_in_new

imageFigure 6. Exogone naidina . A, spiniger-like chaeta; B, falciger; C, dorsal simple chaeta; D, ventral simple chaeta; E, acícula. Scale bar = 10 µm. open_in_new

imageFigure 7. Exogone paulolanai sp. nov. A, anterior body, dorsal view; B, compound chaetae, anterior body; C, compound chaetae, midbody; D, compound chaetae, posterior body; E, dorsal simple chaeta, anterior body; F, dorsal simple chaeta, posterior body; G, ventral simple chaeta, posterior body; H, aciculae, anterior body; I, acicula, posterior body. Scale bars A = 100 µm; B–I = 10 µm. open_in_new

imageFigure 8. Exogone paulolanai sp . nov., SEM. A, anterior body, dorsal view; B, anterior body, ventral view; C, prostomium and peristomium, dorsal view; D, prostomium and peristomium, ventral view (pharynx everted); E, prostomium, frontal view (pharynx everted); F, anterior body, left lateral view. Scale bars: A, B = 50 µm; C, D = 20 µm; E, 10 µm; F, 30 µm. open_in_new

imageFigure 9. Exogone paulolanaisp . nov., SEM. A, tuft of cilia and peristomial cirrus (pc); B, pygidium, dorsal view; C, falciger, mid- to posterior body; D, spiniger-like chaeta, anterior body; E–F, chaetae, posterior body; G, dorsal simple chaeta, anterior to midbody; H, dorsal simple chaeta, posterior body. Scale bars: A, C, G, H = 2 µm; B = 10 µm; D = 5 µm; E, F = 3 µm. open_in_new

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