Gabriel Mario Martin

A chronology of the genus Thylamys (Didelphidae, Thylamyini), with emphasis in the forms occurring in Argentina

Introduction

A chronology of the genus thylamys (didelphidae, thylamyini), with emphasis in the forms occurring in argentina. Detailed chronology & taxonomy of Thylamys mouse opossums in Argentina. Clarifies species within Didelphidae, offering diagnoses, distribution maps, and future research insights.

Abstract

The genus Thylamys includes several species of small mouse opossums living predominantly in arid and semi-arid regions of South America. In Argentina, where the genus has more species, different species have been recognized (T. bruchi, T. citellus, T. pallidior, T. pulchellus, T. sponsorius, and T. venustus), but their taxonomy is still confusing. Here, I summarize what we know of the systematics and taxonomy of Thylamys in Argentina, including the main sources of controversy between species. I also provide a differential diagnosis for the species I recognize, a chresonymy, and current distribution maps. Finally, I describe the main issues that should be addressed to improve our understanding of the genus in Argentina.

Review

This manuscript provides a timely and much-needed comprehensive review of the genus *Thylamys*, with a specific focus on the complex taxonomic landscape within Argentina. The abstract clearly identifies the core problem: despite being a region of high species diversity for the genus, the systematics and taxonomy of *Thylamys* in Argentina remain notably confusing, with several recognized species (*T. bruchi, T. citellus, T. pallidior, T. pulchellus, T. sponsorius, T. venustus*) requiring clarification. The stated aim to summarize current knowledge, delineate sources of controversy, and offer a chronological perspective on the genus's understanding is highly relevant for researchers grappling with identification and conservation of these small marsupials. The proposed contributions directly address this confusion through several key outputs. The provision of a differential diagnosis for recognized species is critical for improving future identification accuracy, a perennial challenge in groups with subtle morphological distinctions. Furthermore, the inclusion of a chresonymy offers an invaluable historical tracing of nomenclature, essential for untangling synonymies and clarifying past taxonomic decisions. Coupled with updated distribution maps, these elements collectively serve as a robust toolkit designed to standardize and clarify the current understanding of *Thylamys* species in the region, offering a foundational reference for the field. Finally, the manuscript's intention to describe main issues requiring further investigation is particularly commendable. This forward-looking aspect transforms the paper from merely a summary into a roadmap for future research, guiding efforts to resolve remaining uncertainties. This work appears poised to become an an indispensable reference for mammalogists, systematists, and conservation biologists working on Neotropical marsupials, significantly advancing our comprehension of *Thylamys* biology and evolution in a critical geographic area. The synthesis and clarification offered will undoubtedly stimulate subsequent targeted studies to resolve the identified challenges.

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