Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/326136
Type: Artigo
Title: The Organs Of Prey Capture And Digestion In The Miniature Predatory Bivalve Spheniopsis Brasiliensis (anomalodesmata: Cuspidarioidea: Spheniopsidae) Expose A Novel Life-history Trait
Author: Morton
Brian; Machado
Fabrizio Marcondes; Passos
Flavio Dias
Abstract: Spheniopsis brasiliensis, from depths of 17-148 m off the southern Atlantic coast of Brazil, is a predator of epipsammic micro-crustaceans which it sucks into the infra-septal chamber using a raptorial inhalant siphon and internally generated hydrostatic suction forces. Prey items, which include ostracods, are thought to be pushed into the funnel-shaped mouth using the foot. The stomach is capacious with a short style sac conjoined briefly with the mid gut and possessing a stubby crystalline style. Internal stomach architecture is simplified, with no identifiable sorting areas (unlike other cuspidarioids) and lined virtually completely by a gastric shield. The exoskeletal remains of digested prey are held in the posterior end of the stomach and not in a specialised waste storage pouch as in the con-familial Grippina coronata. The mid gut, hind gut and rectum are all extremely narrow and, thus, only the smallest of faeces can be accommodated and transmitted for anal discharge. Spheniopsis brasiliensis, like G. coronata is a self-fertilising simultaneous hermaphrodite with encapsulated lecithotrophic eggs brooded internally. Both taxa are thus ovovivaporous. It is also believed that both taxa are univoltine so that larvae and the exoskeletal prey remains are all released post mortem. Cuspidariids are generally regarded as dioecious but, recently, Cardiomya costellata has been shown to be a non-brooding simultaneous hermaphrodite. The distinguishing characters between cuspidariids and spheniopsids thus appear to be their differing reproductive strategies and life history traits.
Subject: Bivalvia
Septibranch
Prey Processing
Reproductive Strategy
Self-fertilisation
Internal Brooding
Univoltism
Editor: Taylor & Francis Ltd
Abingdon
Rights: fechado
Identifier DOI: 10.1080/00222933.2016.1155780
Address: http://www.tandfonline.com/doi/full/10.1080/00222933.2016.1155780
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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