According to a multi-trait systematic study led by the Federal University of Pará, ornithologists Silver-cheeked anteater (Sacesphoroides cristatus) It actually represents not one but two species.
A newly discovered species, the northern stingray (Sacesphoroides niedegidonae)teeth, CaatingaA natural area located in the interior of northeastern Brazil.
“Caatinga is the largest seasonally dry tropical forest in the Neotropics, located in northeastern Brazil, and is characterized by a predominantly deciduous forest and extreme seasonality of rainfall,” Dr. Pablo Cerqueira Emilio Goeldi from the Paraense Museum of the Federal University of Pará and his colleagues.
“Historically, this area has been treated as a biologically impoverished region, but recent studies have uncovered new diversification patterns and several new species of frogs, mammals, insects and fish.”
“The region's topography has played an important role in its biogeographical history, with altitudes ranging from sea level in the north to an average of 400-700 metres in the central states of Bahia and Minas Gerais, to over 1,000 metres on the slopes of the Sierra de Espinhaço mountain range.”
Sacesphoroides niedegidonae It is the second known species in the genus. SacesphoroidesThis also includes Sacesphoroides cristatus.
“Until recently, Sacesphoroides cristatus Classified into the genus SacesphorusHowever, new genetic and morphological data have revealed that the genus is non-monophyletic, prompting its transfer to a separate genus. Sacesphoroides” the researchers said.
In this study, a total of 1,079 Sacesphoroides cristatus Sample size (818 males, 261 females).
To investigate song variation, the researchers analyzed a total of 115 different audio recordings.
They also sequenced 58 tissue samples from across the country. Sacesphoroides cristatus The range is wide, with 39 of them belonging to the left bank of the San Francisco River and 19 on the right bank.
Of the 1,079 individuals analysed (skins and photographs), no diagnostic plumage differences could be identified among males, but two main plumage patterns were diagnosed in females, mainly across the river.
“Men Sacesphoroides niedegidonae The feathers are similar Sacesphoroides cristatus“The males are males, but the females have different colouring on the top of their heads, backs and tails than the males,” the scientists said.
“Sacesphoroides niedegidonae It is generally lighter in color (amber) rather than chestnut brown. Sacesphoroides cristatus. “
The back is olive brown Sacesphoroides niedegidonae,on the other hand, Sacesphoroides cristatus It's cinnamon brown.”
“The overall color of the tail is Sacesphoroides niedegidonae Darker than Sacesphoroides cristatusThe most noticeable difference is the black and white stripes. Sacesphoroides cristatus It has a modest dull brown and reddish stripes, and no white stripes at all.”
“Sing out loud Sacesphoroides niedegidonae The general pattern is: Sacesphoroides cristatus“However, the shape of the first note is noticeably different,” they added.
“The new species is almost exclusively restricted to the left/north bank of the São Francisco River, with one population occurring on the right bank in the “Raço da Catarina” region of Bahia.”
“This population, discovered on the right/south bank of the San Francisco River, may have 'migrated' across the river due to changes in paleotopography, as detailed in the Discussion section below.”
Sacesphoroides niedegidonae It is a common species throughout most of its range and occurs in a variety of habitats in the Caatinga, including secondary growth vegetation.
“The range of the outbreak is estimated to be 630,000 km.2not approaching the threshold Vulnerable Status according to IUCN range criteria (<20,000 km2)2),” the authors state.
“Although population data is not available, the mature population is estimated at more than 10,000 individuals, and the species Least Concern. “
“But a new approach using niche modelling for future climate scenarios shows Sacesphoroides cristatus (include Sacesphoroides niedegidonae(same as treated prior to this study).
“When we apply the IUCN criteria to these estimated future range sizes, the threatened category is Near Threatened And more Vulnerable It depends on future global change scenarios.”
Discovery Sacesphoroides niedegidonae It has been reported paper In the journal Zoological scriptor.
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Pablo Cerqueira othersA new ant shrike (Aves: Shrikeidae) endemic to Caatinga and the role of climate variability and drainage change in shaping the potential diversity of a Neotropical seasonally dry forest. Zoological scriptorpublished online June 17, 2024. Source: 10.1111/zsc.12672
Source: www.sci.news
