Redescription and anatomy of Diplodonta portesiana (d’Orbigny, 1846) (Bivalvia, Ungulinidae) from Brazil
نویسندگان
چکیده
The present redescription of Diplodonta portesiana (d'Orbigny, 1846) is the first part of the revision of this genus in the East Atlantic. This species, despite being common in the Atlantic coast, remains poorly known. A detailed shell and anatomical study was conducted based not only on specimens from the type locality's vicinities but also on samples from other regions. Diagnostic characters for Diplodonta portesiana includes: rounded shell with a small ligament; triangular, short and deep nymph; external micro ornamentation composed of small concavities in a concentric pattern; small adductor muscles; reduced pedal gape; pair of long hemipalps with a large area covered by folds; stomach with four ducts leading to digestive diverticula; and long intestine length. Our study suggests at least two new diagnostic characters to the genus: the two pair of muscles that controls the incurrent and excurrent openings and a residual ring-like tissue surrounding the anterior half of the posterior foot retractor muscle.
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(1) Superintendency for the Control of Endemic Diseases/SUCEN, São Paulo, SP, Brazil. (2) Faculty of Public Health, USP, São Paulo, SP, Brazil. (3) Parasitology Laboratory, Butantan Institute, São Paulo, SP, Brazil. Correspondence to: Marisa Cristina de Almeida Guimarães, Laboratório de Malacologia da Superintendência de Controle de Endemias (Sucen), Rua Paula Souza 166, 5o andar; 01027-000 São...
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