Scavenger gastropod devouring a common lamellibranch bivalve in an estuary of Northeast Brazil

Evandro Cosmo Tomaz Abreu e Silvio Felipe Barbosa Lima

Abstract
Nassaridae Iredale, 1916 (1835) is one of the main groups of scavenger neogastropods that usually live in a gregarious manner on soft and rocky substrates mainly of estuarine ecosystems in the seas and oceans of the World. The aim of this paper was to describe Phrontis polygonata (Lamarck, 1822) feeding on the carrion of the lamellibranch bivalve Anomalocardia flexuosa (Linnaeus, 1767) in an estuarine region of Northeast Brazil. A total of 27 adult individuals of P. polygonata were observed actively crawling on and around the venerid attempting to feed on its tissue. During the observation period, the proboscis of the nassarids could only reach the mantle margin of A. flexuosa due to the narrow spacing of the valves. This study reaffirms the ecological relevance of P. polygonata associated with the consumption of bivalve carrion in shallow estuarine waters of the Western Atlantic.

Keywords
Scavenger invertebrates; Scavenger mollusks; Gastropoda; Bivalvia; Carrion.

Resumo
Gastr pode necr fago devorando um bivalve lamelibr nquio em um estu rio no nordeste do Brasil. Nassaridae Iredale, 1916 (1835) um dos principais grupos de neogastr podes necr fagos que comumente vivem de forma greg ria associado a diferentes tipos de substratos, principalmente de regi es estuarinas nos mares e oceanos do Mundo. O objetivo deste estudo foi descrever Phrontis polygonata (Lamarck, 1822) alimentando-se do bivalve Anomalocardia flexuosa (Linnaeus, 1767) em estado de putrefa o numa regi o estuarina do nordeste do Brasil. Um total de 27 indiv duos de P. polygonata foi observado rastejando ativamente ao redor e sobre o vener deo na tentativa de alimentar-se do lamelibr nquio. Durante o per odo observado, a prob scide dos nassar deos obteve alcance at a borda do manto de A. flexuosa devido ao estreito espa amento das valvas. Este estudo reafirma a relev ncia ecol gica de P. polygonata associado ao consumo de bivalves em putrefa o em guas rasas estuarinas do Atl ntico Oeste.

Palavras-chave
Invertebrados necr fagos; Moluscos necr fagos; Gastropoda; Bivalvia; Carni a.

DOI
10.21438/rbgas(2023)102410

Texto completo
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