Summary:The Brazilian species Pustulatirus ogum and Hemipolygona beckyae were examined, and certain morphological characters were described. Both species were originally assigned to the genus Latirus, considered as a heterogeneous complex. The radulae of both species are like that which characterizes Latirus, in which the innermost cusp of the rachidian tooth is well developed but always smaller than the other cusps. This feature differs from Leucozonia, in which this cusp is reduced or absent. The penis tapers terminally, and the tapered part may be long (more than half the total penis length), as in H. beckyae, or very short (less than half the total penis length), as in P. ogum. The anatomical data observed in both species are discussed under the framework of fasciolariid systematics and they appear to be widespread among other fasciolariid species. For this reason, to date, the soft-part features here provided and those known from previously studied species of Latirus are not useful for delineating precise generic diagnoses.Keywords: morphology; Caenogastropoda; Fasciolariidae; Latirus; western Atlantic.
Anatomía comparada de los fascioláridosPustulatirus ogum y Hemipolygona beckyae de Brasil (Gastropoda: Buccinoidea: Peristerniinae) Resumen: Se describe la morfología y anatomía de las especies brasileñas Pustulatirus ogum y Hemipolygona beckyae. Ambas especies han sido tradicionalmente asignadas al género Latirus, que en la actualidad se considera que agrupa a un conjunto heterogéneo de especies. Las rádulas de ambas especies son como la que caracteriza a Latirus, con la cúspide más interna del diente raquídeo bien desarrollada y siempre menor que las otras cúspides. Esta característica difiere de la que presentan las especies del género Leucozonia, en las que esta cúspide está reducida o ausente. El pene se estrecha en su parte terminal, y la parte cónica puede ser larga (más de la mitad de la longitud total del pene), como en H. beckyae, o muy corta (menos de la mitad de la longitud total del pene), como en P. ogum. Los caracteres morfológicos observados en ambas especies se discuten en el marco de la sistemática de los Fasciolariidae y parecen estar ampliamente distribuidos en otras especies de fascioláridos. Por ello, hasta la fecha, las características de las partes blandas del animal aquí descritas y las conocidas previamente de otras especies de Latirus no se consideran de utilidad para la diagnosis de los géneros en esta familia.
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