Abstract
Migration of Boreotropical megathermal taxa during the Oligocene and Miocene played a key role in assembling diversity in tropical regions. Despite scattered fossil reports, the cashew genus Anacardium offers an excellent example of such migration. The fossil woods described here come from localities in Veraguas, Panama mapped as Oligocene-Miocene. We studied, described, and identified two well-preserved specimens using wood anatomical characteristics and completed extensive comparisons between fossil and extant material. The studied fossil woods share several diagnostic features with the modern Anacardium genus, including large solitary vessels, large intervessel-pitting, a simple vessel-ray pitting pattern, and mostly 1–3 seriate rays with large rhomboidal solitary crystals. We propose a new fossil species named Anacardium gassonii sp. nov., that adds an essential piece to the understanding of the historical biogeography of the genus. In addition, our findings confirm previous interpretations of this species’ migration from Europe to North America and its crossing through Panama, leading to subsequent diversification in South America. This discovery provides an important link to the historical migration patterns of the genus, supporting the notion of an Eocene migration to the Neotropics via Boreotropical bridges, as well as an Oligocene-Miocene crossing of Central America followed by diversification in South America.
Highlights
The Anacardiaceae family has approximately 80 genera and 900 species, represented by trees, shrubs, and some woody climbers; the family is widely distributed in tropical and subtropical areas as well as in warm-temperate regions [1]
A new Oligocene-Miocene tree from Panama and Anacardium history approximately 80 reported fossil woods associated with the Anacardiaceae family [e.g., 2–8]
Two distinctive vessel size categories can be observed in A. corymbosum, A. humile, A. nanum, and A. occidentale
Summary
The Anacardiaceae family has approximately 80 genera and 900 species, represented by trees, shrubs, and some woody climbers; the family is widely distributed in tropical and subtropical areas as well as in warm-temperate regions [1]. The extensive fossil records of Anacardiaceae worldwide make this family an excellent example for biogeographical studies. A new Oligocene-Miocene tree from Panama and Anacardium history approximately 80 reported fossil woods associated with the Anacardiaceae family [e.g., 2–8]. Most of these records are from South America and Asia [9]. There have been a few reports of fossil Anacardiaceae in Panama based on permineralized fruits and silicified woods. The oldest reported fossil remain is an endocarp identified as Dracontomelon L., which was recovered from the Eocene Tonosı Formation [10]. Three Miocene Spondioideae fruits from the Cucaracha Formation in the Panama Canal, identified as Spondias rothwellii, Dracontomelon montesii, and Antrocaryon panamensis [11], document the significance of the Spondioideae in early Miocene Panama forests
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