Browsing by Autor "Heinz Arno Drawert"

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A new species of Ceiba (Malvaceae, Bombacoideae), previously confused with Ceiba speciosa
(Q15088586, 2024) Heinz Arno Drawert; Alcibiades A. Angulo; Juan Carlos Catari
Based on the review of herbarium specimens, geo-referenced live images, and field observations, a new species of the genus Ceiba (Malvaceae) is described. Ceiba camba, the new species, has previously been confused with other species in the Ceiba insignis complex, specially with C. speciosa, and went undifferentiated despite having a wide distribution in the lowlands of central-western South America and being quite common. However, the new species here described shows clear visible morphological differences from C. speciosa and the other members of the genus. The main similarities and differences with other morphologically and geographically close species of the C. insignis complex (C. chodatii, C. crispiflora, C. insignis, C. lupuna, C. pubiflora, C. speciosa) are discussed.
A new species of the seasonal killifish genus Moema (Cyprinodontiformes: Rivulidae) from the Piraí watershed in the Southwest Amazon basin
(Sociedade Brasileira de Ictiologia, 2022) Heinz Arno Drawert
Abstract Moema, a genus of the Rivulidae family, currently comprises 20 valid species. Most of these species inhabit temporary pools in the Amazon basin and only one species is found in the upper Paraguay basin. A new member of this genus from the upper Río Madeira drainage is here described. Males of the new species differ from all congeners by the combination of a color pattern consisting of oblique, sometimes chevron-like, irregular rows of red and light blue double-dots on body; dark yellowish to golden pectoral fins with no visible markings; and a stripe pattern on the ventral section of caudal fin with a very narrow black marginal line, intermittent or even absent. The existence of infrageneric species groups within Moema, the geographic distribution and taxonomic aspects of the species present in the Ríos Mamoré and Iténez/Guaporé rivers drainages, and the observation of intraspecific aggression between males and amphibious lifestyle in the new species are discussed.
Ceiba guarani (Malvaceae, Bombacoideae), a new species from sub-Andean southern Bolivia and the Sierras of northwestern Argentina
(Instituto de Botánica del Nordeste, 2024) Juan Carlos Catari; Heinz Arno Drawert; Alcibiades A. Angulo
Based on observations made during botanical surveys in the southern sub-Andean of Bolivia, analysis of collected material, review of herbarium material and online databases, we determined that the Ceiba populations of the xeric Bolivian-Tucuman forests, previously identified as Ceiba chodatii, correspond to a new species. Given that the morphological, ecological and distributional characteristics differ from those observed in populations of C. chodatii, we propose Ceiba guarani sp. nov. Our field observations and distribution data from the revised specimens indicate that C. chodatii is naturally restricted to the Chaco plains and a strip of the southern Subandean foothills, whereas Ceiba guarani is distributed mainly in the Subandean ranges.
Ceiba lupuna (Malvaceae): nuevo registro para Bolivia
(Instituto de Botánica del Nordeste, 2026) Juan C. Catari; Heinz Arno Drawert; Alcibiades A. Angulo; Samuel Sangueza Farah
Se reporta por primera vez la presencia de Ceiba lupuna (Malvaceae) en territorio boliviano, en la región de la Amazonia del departamento de Pando. Este registro amplía el número de especies del género Ceiba citadas para el país a 9 taxones y contribuye al conocimiento de la flora amazónica. La identificación se basó en observaciones morfológicas y fotográficas de individuos en estado reproductivo. Se discuten sus diferencias con Ceiba camba, especie morfológicamente similar y posiblemente confundida en la región.
Redescription of Austrolebias accorsii (Cyprinodontiformes: Rivulidae) and description of a new species of the genus from the upper Paraguay River basin
(2026) Heinz Arno Drawert; Carlos Ergueta
Redescription of Austrolebias accorsii (Cyprinodontiformes: Rivulidae) and description of a new species of the genus from the upper Paraguay River basin
(Sociedade Brasileira de Ictiologia, 2024) Heinz Arno Drawert; Carlos Ergueta
Abstract Austrolebias accorsii is redescribed based on specimens from type-locality, nearby temporary pools, and other locations within the same hydrologic unit. Additionally, a novel Austrolebias species is described, exclusively found in two temporary waterbodies in “Abayoy”, a unique vegetation type situated in the transitional zone between the Dry Chaco, Chiquitano Dry Forest, and Pantanal Flooded Savannas ecoregions in southeastern Bolivia, bordering Paraguay, where the last voluntarily isolated indigenous people outside the Amazon in America reside. Diagnostic characters for both species are presented. Within Austrolebias two species groups are recognized with different morphological characters, geographical distribution, and ecological traits of their habitats. Furthermore, we suggest the usage of median and interquartile range rather than mean and standard deviation to analyze morphometric and meristic data of rivulids, given the typically non-Gaussian distribution of this data.
Rediscovery of a thought to be extinct beauty: a second chance for conservation
(Pensoft Publishers, 2025) Heinz Arno Drawert; Thomas O. Litz
Some rivulids are specialized to live in temporary or ephemeral water bodies, and for this reason they are known as annual or seasonal fishes. The fact that these seasonal species inhabit small temporary wetlands, which are easily modified and destroyed, represents a major challenge to their conservation and often puts them at risk of extinction. In Bolivia, one of the countries with the highest recent loss of primary tropical forests, of 32 recorded species, more than half (19) are endemic, and nearly one-third (9) are known only from their type localities. Of the 20 species assessed by the IUCN that occur in the country, eight have been classified in some threat category, and one of them, Moema claudiae (Costa, 2003), is listed as Critically Endangered and possibly extinct. The species had not been recorded in the wild for more than 20 years, and its only known locality—as well as much of its potential distribution area—have been severely degraded and are now occupied by extensive agroindustrial crops. In this work, we report the finding of a population of Moema claudiae recently discovered in a temporary pond within a small forest remnant surrounded by crops. This discovery allows us to provide the first live photographs of the species, along with previously unknown aspects of its biology and ecology. Furthermore, it offers an exceptional opportunity of a second chance to conserve a species that was already believed to be extinct and lost forever.
Rediscovery of a thought to be extinct beauty: a second chance for conservation
(2025) Heinz Arno Drawert; Thomas Otto Litz
Rivulids are mostly specialized to live in temporary or ephemeral water bodies, and for this reason they are known as annual or seasonal fishes. Their limited geographic distribution, specialized habitats, and narrow ecological niches&mdash;along with other intrinsic traits&mdash;make them particularly vulnerable to conservation threats such as ecosystem degradation and climate change, and often puts them at risk of extinction. In Bolivia, one of the countries with the highest recent loss of primary tropical forests, of the 32 species recorded, more than half (19) are endemic, and nearly one-third (9) are known only from their type localities. Of the 20 species assessed by the IUCN that occur in the country, 8 have been classified in some threat category, and one of them, Moema claudiae , is listed as Critically Endangered and possibly extinct. The species had not been recorded in the wild for more than 20 years, and its only known locality&mdash;as well as much of its potential distribution area&mdash;have been severely degraded and are now occupied by extensive agroindustrial crops. In this work, we report the finding of a population of Moema claudiae recently discovered in a temporary pond within a small forest remnant surrounded by crops. This discovery allows us to provide the first live photographs of the species, along with previously unknown aspects of its biology and ecology. Furthermore, it offers an exceptional opportunity of having a second chance to conserve a species that was already believed to be extinct and lost forever.
Rivulids (Rivulidae: Cyprinodontiformes) of Bolivia: knowledge status and updated inventory
(2023) Heinz Arno Drawert
The state of knowledge regarding rivulids in Bolivia is still limited and has some significant gaps. With the aim of synthesizing and systematizing the available information, which is often scattered, a monographic review is presented that examines the knowledge status of the Rivulidae family and provides an updated inventory of the species present in the country, based on valid records supported by voucher specimens deposited in scientific collections. The presence of 31 species of the Rivulidae family in Bolivian territory is confirmed, distributed across 10 genera and belonging to two subfamilies: Cynolebiinae and Rivulinae. Furthermore, it is validated that 58% (18 species) are endemic to Bolivia, while 25.8% (8 species) have a highly restricted distribution and are recorded only from their type localities. In the context of Bolivia, this work provides a solid foundation for future research and significantly contributes to the knowledge, and therefore the conservation, of this paradigmatic group of fish.