A new species of Trembleya (Melastomataceae: Microlicieae) with notes on leaf anatomy and generic circumscription

Abstract

A new species of Trembleya that was first recognized by Auguste François Marie Glaziou is described. Line drawings, photographs, descriptions of the leaf anatomical structure, SEM images, distribution maps, conservation status, and comments on the generic circumscription of Trembleya are provided. The new species appears to be endemic to the Chapada dos Veadeiros in Goiás, Brazil. It is characterized by its oblong-lanceolate leaf blades (1.4–4.5 × 0.3–0.9 cm) that are papyraceous, 3–5-nerved from the base and glandular-punctate on both surfaces, tertiary veins not evident, well-developed inflorescences, flowers with subisomorphic stamens that are completely yellow and ovaries with 3(–4) locules. A conservation assessment of Endangered (EN) is recommended for this species based on IUCN Red List Categories and Criteria.

Systematics of the Trembleya sensu stricto clade of Microlicia (Melastomataceae, Lavoisiereae)

“…Based on an expanded phylogenetic analyses using five molecular markers (atpF-atpH, trnS-trnG, nrITS, nrETS and waxy) and 12 morphological characters for 113 taxa in Lavoisiereae, Versiane et al (2021) transferred all species of Trembleya to the enlarged Microlicia s.l. In order to accommodate these species in Microlicia, Versiane et al (2021) 2021) also supported the recognition of Trembleya s.s. as a distinct clade, as previously suggested by Pacifico et al (2019). Although recognisable morphologically, the Trembleya s.s. clade was transferred to Microlicia by Versiane et al (2021) because the recognition of that clade as a distinct genus would make Microlicia s.l.…”

“…Fritsch et al (2004) confirmed the placement of Trembleya in Lavoisiereae using molecular data. Subsequently, new species were described in Trembleya by Fidanza et al (2013), Pacifico and Fidanza (2015) and Pacifico et al (2019). Additionally, one species was transferred from Lavoisiera DC.…”

“…Almeda & R.B.Pacifico]. Pacifico et al (2019) argued that Trembleya was polyphyletic and a new circumscription was necessary in order to reduce this genus to a monophyletic group of 11 species (Trembleya s.s.).…”

“…Versiane et al (2021) recovered little support for most clades within Microlicia s.l., whereas some internal clades were strongly supported and are recognisable morphologically, e.g. the "Trembleya s.s." "Lavoisiera" and "Chaetostoma" clades (Koschnitzke and Martins 2006;Martins and Almeda 2017;Pacifico et al 2019;Versiane et al 2021). For a complete taxonomic history of the tribe, see Martins and Almeda (2017: 32-34) and Pacifico and Almeda (2022).…”

Occurrence of Arcellidae (Amorphea, Arcellinida) in a coastal stream in the State of Rio de Janeiro

“…Knowledge about species richness and composition of an environment represents the most important attributes when studying a biological system (Ricklefs & Schluter, 1993). It is known that there are numerous studies aimed at describing the composition and focused on the taxonomy of many groups of organisms (Frota, Ota, Deprá, Ganassin, & Graça, 2020;Pacifico, Almeda, Carmo, & Fidanza, 2019). However, protists especially planktonics, are under-explored groups today (Lansac-Tôha, Bonecker, Velho & Lima, 2004).…”