Abstract
Tweedy’s Crab-eating Rat, Ichthyomys tweedii Anthony, 1921, was described based on just a few specimens, and many aspects of its biology remains unclear. The species has only been previously reported to occur in two geographically disjunct areas in Panama and Ecuador. We report a new record of this species for southern Costa Rica. Our new record is the first for this species and the genus for Costa Rica, as well as the northernmost expression of the genus.
Highlights
Neotropical, mostly semiaquatic sigmodontine mice and rats are grouped in the tribe Ichthyomyini Cockerell & Printz in Cockerell et al 1914
We report a new record of this species for southern Costa Rica
For specific comparisons with the other Ichthyomys species, see Voss (2008, 2015) and Fernández de Córdova et al (2019). This new report represents an extension of the known geographic distribution of I. tweedii, approximately 300 km from the closest report in Panama and more than 1400 km from its type locality in Ecuador (Fig. 1)
Summary
Neotropical, mostly semiaquatic sigmodontine mice and rats are grouped in the tribe Ichthyomyini Cockerell & Printz in Cockerell et al 1914 This clade harbors 19 species in five genera, distributed in the Neotropics, mainly in South America (Pardiñas et al 2017; Fernández de Córdova et al 2019). The genus Rheomys Thomas, 1906 is the only ichthyomyine that is endemic to the Mesoamerican region, with four species distributed from Oaxaca in southern Mexico to western Panama (Voss 1988, 2015) In addition to these species, one species of the genus Ichthyomys Thomas, 1893 (I. tweedii Anthony, 1921) has been recorded in Panama, representing the northern distribution limit for the genus (McPherson 1985; Méndez 1993). Its distribution ranges north to south from the mouth of the river Trinidad, Capira, in Panama (03°02′S, 079°41′W) to the type locality in Río Amarillo, Portovelo, Provincia del Oro, Ecuador (03°43′S, 079°39′W), and it occurs from sea level to elevations up to 1350 m (Voss 2015)
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