Sigambra grubii Mueller in Grube, 1858

Ribeiro, Rannyele Passos, Alves, Paulo Ricardo, Almeida, Zafira da Silva de & Ruta, Christine, 2018, A new species of Paraonis and an annotated checklist of polychaetes from mangroves of the Brazilian Amazon Coast (Annelida, Paraonidae), ZooKeys 740, pp. 1-34 : 13

Sigambra grubii Mueller in Grube, 1858 Fig. 8B

Type locality.

Florianópolis, Santa Catarina, Brazil (27°36'30"S, 48°26'30"W; original geolocation).

Material examined.

São Luís, 02°35'56"S, 44°21'11.8"W: one specimen, 18 August 2010 (NPM-Pol 110); one specimen, 27 January 2011 (NPM-Pol 887). Caranguejos Island, 02°49'33.6"S, 44°28'51.1"W: one specimen, 22 April 2010 (NPM-Pol 888). Complete and incomplete specimens.

Distribution.

Atlantic Ocean: USA, Caribbean Sea, Brazil (states of Pará, Maranhão, Sergipe, Rio de Janeiro, São Paulo, Santa Catarina and Rio Grande do Sul, see Suppl. material 1).

Remarks.

First species record for Maranhão. The presence of notopodial hooks distally curved appearing in setiger 20 and a medium antenna reaching the second chaetiger are characteristics that support the identification of the species based on the original description by Müller (1858) and re-description by Salazar-Vallejo (1990). In this study, the hooks appeared among the segments 6-29, in specimens shorter and with reduced number of chaetigers, the hooks appeared before the chaetiger 20. This type of variability in the hooks position related with the body size and number of chaetigers was also reported by Salazar-Vallejo (1990). No other morphological variation was found. This species is widely recorded in the coast of Brazil, mainly in estuarine environments, including mangroves and coastal lagoons as the type locality ( Müller 1858). In the Caribbean, the species was recorded in a coastal lagoon ( Liñero-Arana and Díaz-Díaz 2005).