Redescription and anatomy of Diplodonta portesiana (d’Orbigny, 1846) (Bivalvia, Ungulinidae) from Brazil

By

Romera, Bárbara
Simone, Luiz Ricardo Lopes de.
Cunha, Carlo Magenta

Type

Article

Date of Publication

2013

Original Publication

ZooKeys

Volume

275

Pages

1-15

Subjects

Anatomy , Atlantic Ocean , Diplodonta portesiana , taxonomy , Ungulinidae

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers

Identifiers

DOI: https://doi.org/10.3897/zookeys.275.3782

 

Abstract

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 D. 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.