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Taxonomy in the 21st Century: Celebrating a New Chapter—First Impact...
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Taxonomy in the 21st Century: Celebrating a New Chapter—First Impact Factor Received

A special issue of Taxonomy (ISSN 2673-6500).

Deadline for manuscript submissions: 15 June 2026 | Viewed by 12919

Special Issue Editor

Prof. Dr. Mathias Harzhauser

E-Mail Website
Guest Editor
Geological-Paleontological Department, Natural History Museum Vienna, Burgring 7, 1010 Vienna, Austria
Interests: paleobiogeography; Mollusca; paleogeography; stratigraphy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We are delighted to announce a milestone achievement for Taxonomy—the journal has received its first Impact Factor of 1.5, ranked Q2 in the ZOOLOGY category and Q3 in the PLANT SCIENCE category, achieved a 2024 CiteScore of 2.4, and ranked Q2 in Agricultural and Biological Sciences: Agricultural and Biological Sciences (miscellaneous). The support and dedication of all the editors, reviewers, authors, and readers are an integral part of the journal’s performance.

To celebrate this exciting occasion, we are launching a Special Issue targeting innovative approaches and new developments in the field of taxonomy, systematics and nomenclature. We warmly invite you to submit your manuscripts to increase the visibility and impact of Taxonomy, and we look forward to your contributions.

Topics of interest include (but are not limited to) the following:

Taxonomy, evolution, and biodiversity;
Microtaxonomy and macrotaxonomy;
Morphospecies versus genetics;
Deep time diversity;
Identification and description of new species;
Citizen science in taxonomy.

Prof. Dr. Mathias Harzhauser
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Taxonomy is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • new species
  • taxonomy
  • biodiversity
  • citizen science
  • paleontology
  • zoology
  • botany
  • microbes

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (7 papers)

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Research

11 pages, 5579 KB  
Article
The Caddisfly Genus Contulma Flint, 1969 (Trichoptera: Anomalopsychidae) in Brazil: A New Species, Distribution, and an Identification Key
by Gleison R. Desidério, Lívia Piovezani, Maria C. L. Ghirardello and Pitágoras C. Bispo
Taxonomy 2026, 6(2), 23; https://doi.org/10.3390/taxonomy6020023 - 10 Apr 2026
Viewed by 339
Abstract
Anomalopsychidae Flint, 1981, is a small family of caddisflies comprising two genera: the monotypic Anomalopsyche Flint, 1967, and Contulma Flint, 1969, including 31 described species grouped into the cranifer and spinosa species groups. The genus Contulma is distributed across Costa Rica, the Andes, [...] Read more.
Anomalopsychidae Flint, 1981, is a small family of caddisflies comprising two genera: the monotypic Anomalopsyche Flint, 1967, and Contulma Flint, 1969, including 31 described species grouped into the cranifer and spinosa species groups. The genus Contulma is distributed across Costa Rica, the Andes, and the mountainous areas of Brazil and Chile, with six species recorded in Brazil, primarily from the Atlantic Forest biome in the southeastern region. In this study, we describe and illustrate a new species of Contulma from the Cerrado biome of São Paulo State, representing the first record of the genus in this biome. Male specimens were collected using Malaise traps in a stream within a protected area. The new species is distinguished by the presence of both a strongly sclerotized dorsomesal process and a strongly dorsolateral process on tergum IX and by an extremely deep cleft in the posteromesal process of sternum IX, dividing it into two narrow, digitated lobes. Based on its unique combination of characters, the new species cannot be placed unambiguously in either of the species groups. Consequently, C. assisensis sp. nov. is here treated as incertae sedis within Contulma. With this addition, seven species of Contulma are now known from Brazil, most of which are recorded from the Atlantic Forest (6 spp.), especially in the mountainous areas of southeastern Brazil. The discovery of this new species in the Cerrado highlights the underestimated diversity of the genus in Brazil and underscores the importance of regional taxonomic studies for addressing biogeographic and diversity knowledge gaps. The identification key provided enables the differentiation of the seven Contulma species now known from Brazil. Full article
(This article belongs to the Special Issue Taxonomy in the 21st Century: Celebrating a New Chapter—First Impact Factor Received)
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18 pages, 2009 KB  
Article
The Megalopa Stage in Grapsidae Crabs (Decapoda, Brachyura), a First Complete Overview Based on New Data from Plankton-Collected Megalopae Identified by DNA Barcodes
by Elena Marco-Herrero, Juan Ignacio González-Gordillo and Jose A. Cuesta
Taxonomy 2026, 6(1), 15; https://doi.org/10.3390/taxonomy6010015 - 5 Feb 2026
Viewed by 1346
Abstract
The family Grapsidae is composed of 39 species belonging to seven genera. Currently, larval data are known for 24 out of the 39 species, but the megalopa stage remains unknown for the genera Goniopsis, Grapsus, Leptograpsus, and Planes, although [...] Read more.
The family Grapsidae is composed of 39 species belonging to seven genera. Currently, larval data are known for 24 out of the 39 species, but the megalopa stage remains unknown for the genera Goniopsis, Grapsus, Leptograpsus, and Planes, although megalopae collected in the plankton have been tentatively attributed to Grapsus and Planes. Thanks to the MALASPINA and MAF research projects, a significant number of megalopae were collected from open-ocean plankton worldwide, and, using DNA barcoding (16S and/or COI genes), a high percentage of them were identified. At the molecular level, Grapsidae have been widely studied, so the availability of barcode sequences in public databases has allowed us to identify the megalopa of Goniopsis pulchra, Grapsus grapsus, Leptograpsus aff. variegatus, Pachygrapsus socius, P. transversus, and Planes minutus. In the present work, these megalopae are described in detail and compared with those previously known. Consequently, for the first time, the morphology of the megalopa stage can be compared across all grapsid genera, and a set of characteristics is defined to identify the grapsid megalopa from the rest of the brachyuran megalopae. Full article
(This article belongs to the Special Issue Taxonomy in the 21st Century: Celebrating a New Chapter—First Impact Factor Received)
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15 pages, 16145 KB  
Article
A New Species of the Genus Ptyctolaemus Peters, 1864 (Squamata, Agamidae) from Yunnan, China
by Shuo Liu, Xiaoyu Zhu, Mian Hou, Zhengpan Duan, Changsheng Zuo, Fawang Yin and Dingqi Rao
Taxonomy 2026, 6(1), 4; https://doi.org/10.3390/taxonomy6010004 - 3 Jan 2026
Cited by 1 | Viewed by 1227
Abstract
A new species of the genus Ptyctolaemus Peters, 1864 is described from Yunnan Tongbiguan Provincial Nature Reserve, China. The new species phylogenetically formed a clade sister to P. namdaphaensis, but it can be easily distinguished from P. namdaphaensis by the difference in [...] Read more.
A new species of the genus Ptyctolaemus Peters, 1864 is described from Yunnan Tongbiguan Provincial Nature Reserve, China. The new species phylogenetically formed a clade sister to P. namdaphaensis, but it can be easily distinguished from P. namdaphaensis by the difference in the color of the dewlap. The new species is superficially most similar to P. chindwinensis; however, it can be distinguished from P. chindwinensis by the difference in the color of the oral cavity and tongue. This discovery increases the number of named Ptyctolaemus species to six. Full article
(This article belongs to the Special Issue Taxonomy in the 21st Century: Celebrating a New Chapter—First Impact Factor Received)
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18 pages, 12685 KB  
Article
Euphorbia peruviandina, a New Species of subg. Chamaesyce sect. Anisophyllum from Central Peru, and Treatments of Two Related Andean Species
by Victor W. Steinmann
Taxonomy 2025, 5(4), 72; https://doi.org/10.3390/taxonomy5040072 - 18 Dec 2025
Viewed by 1334
Abstract
The new species Euphorbia peruviandina (Euphorbiaceae) is described and illustrated with photos and line drawings. It belongs to subgenus Chamaesyce section Anisophyllum and is restricted to the puna vegetation of central and southern Peru at elevations of 3300 to 4200 m. It is [...] Read more.
The new species Euphorbia peruviandina (Euphorbiaceae) is described and illustrated with photos and line drawings. It belongs to subgenus Chamaesyce section Anisophyllum and is restricted to the puna vegetation of central and southern Peru at elevations of 3300 to 4200 m. It is proposed to be endangered following IUCN criteria. A comparison is made with two other Andean species of the section, E. jamesonii of Ecuador and E. orbiculata of Colombia and Venezuela. For all three taxa, type specimens are cited, and morphological descriptions, habitat information, exsiccate, and synonymy are given. An identification key to these taxa is provided. Euphorbia melanocarpa is proposed to be a synonym of E. jamesonii, and E. meridensis is treated as a synonym of E. orbiculata. Full article
(This article belongs to the Special Issue Taxonomy in the 21st Century: Celebrating a New Chapter—First Impact Factor Received)
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15 pages, 8633 KB  
Article
A New Species of the Genus Gracixalus (Anura, Rhacophoridae) from Central Western Yunnan, China
by Shuo Liu, Zhongfu Yang, Chunhua Wang, Nengping Li, Mian Hou, Zengyang Luo and Dingqi Rao
Taxonomy 2025, 5(4), 66; https://doi.org/10.3390/taxonomy5040066 - 26 Nov 2025
Cited by 2 | Viewed by 2012 | Correction
Abstract
A new species of the genus Gracixalus from Yunnan Wuliangshan National Nature Reserve, China, is described based on morphological and molecular evidence. Morphologically, the new species can be distinguished from other species of the genus by a combination of the following characters: body [...] Read more.
A new species of the genus Gracixalus from Yunnan Wuliangshan National Nature Reserve, China, is described based on morphological and molecular evidence. Morphologically, the new species can be distinguished from other species of the genus by a combination of the following characters: body size relatively large, dorsal surface brownish yellow, dorsal skin rough with dense, small flatten tubercles, tibiotarsal projection absent, heels distinctly overlapping, tibiotarsal articulation reaching anterior corner of eye, and nuptial pad absent in adult male. The genetic distance (uncorrected p-distance) between the new species and other species of the genus ranged from 2.3% to 14.3% in the mitochondrial 16S rRNA gene. This study brings the total number of recognized species within the genus Gracixalus to 24 with 13 of which occur in China and four in Yunnan Province. Full article
(This article belongs to the Special Issue Taxonomy in the 21st Century: Celebrating a New Chapter—First Impact Factor Received)
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19 pages, 13647 KB  
Article
Taxonomic Synopsis of Mascagnia (Malpighiaceae) of Brazil
by Rafael Felipe de Almeida and Marco Octavio de Oliveira Pellegrini
Taxonomy 2025, 5(3), 50; https://doi.org/10.3390/taxonomy5030050 - 18 Sep 2025
Viewed by 1668
Abstract
Mascagnia (Malpighiaceae) is the lianescent genus with the most convoluted taxonomic history and polyphyly of Malpighiaceae, formerly comprising eight unrelated accepted genera and over 300 species. This genus currently encompasses 48 accepted Neotropical species, of which 20 are reported for Brazil in the [...] Read more.
Mascagnia (Malpighiaceae) is the lianescent genus with the most convoluted taxonomic history and polyphyly of Malpighiaceae, formerly comprising eight unrelated accepted genera and over 300 species. This genus currently encompasses 48 accepted Neotropical species, of which 20 are reported for Brazil in the taxonomic treatment presented herein. This synopsis was based on the morphological study of specimens deposited in over 80 herbaria using a stereomicroscope, the specialized literature, and consulting type specimens for all accepted species. A total of 20 species of Mascagnia are found in all biomes of Brazil. A taxonomic synopsis is presented for these species, including an identification key, notes on distribution, conservation and taxonomy, and photographic plates for 12 species. Two main morphological groups were identified based on the inflorescence architecture and petal color, and four species were identified as under a conservation threat. Full article
(This article belongs to the Special Issue Taxonomy in the 21st Century: Celebrating a New Chapter—First Impact Factor Received)
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16 pages, 10067 KB  
Article
Forgotten for Decades: Revalidation and Redescription of Raiamas harmandi (Sauvage, 1880) (Cypriniformes: Danionidae) from the Mekong River Basin
by Cai-Xin Liu, Yi-Yang Xu, Yu-Yang Zeng, Thaung Naing Oo and Xiao-Yong Chen
Taxonomy 2025, 5(3), 42; https://doi.org/10.3390/taxonomy5030042 - 20 Aug 2025
Viewed by 3886
Abstract
The genus Raiamas currently comprises 18 valid species, only 2 of which occur in Asia; the remaining 16 are endemic to Africa. Raiamas harmandi was originally described by Sauvage in 1880 as Bola harmandi, which is distributed in the Great Lakes, Cambodia, [...] Read more.
The genus Raiamas currently comprises 18 valid species, only 2 of which occur in Asia; the remaining 16 are endemic to Africa. Raiamas harmandi was originally described by Sauvage in 1880 as Bola harmandi, which is distributed in the Great Lakes, Cambodia, the Mekong River Basin. It was considered a synonym of R. guttatus by later researchers. In this study, we examined 49 Raiamas individuals from the Mekong, Irrawaddy, and Salween river basins, recording both meristic counts and morphometric measurements. Based on the morphological evidence, we revised the taxonomy of Raiamas in the Mekong River Basin, confirming R. harmandi as a valid species and providing a comprehensive redescription. Raiamas harmandi can be distinguished from R. guttatus mainly by having more predorsal scales (25–28 vs. 21–23) and a different color pattern on the lateral body. Utilizing a total of 44 aligned COI and Cyt b sequences—including eight newly sequenced individuals of Raiamas from three river basins—we reconstructed its phylogenetic relationships. The analysis strongly supported four R. harmandi individuals from the Mekong River Basin forming a distinct clade, which was the sister to the clade comprising five R. guttatus individuals from the Irrawaddy and Salween river basins. Genetic distances between R. harmandi and R. guttatus ranged from 14.0 to 14.9% for COI and 16.1 to 17.0% for Cyt b. Distributionally, R. harmandi occurs throughout the Mekong River Basin, as evidenced by combined voucher specimens and molecular sequence data. Full article
(This article belongs to the Special Issue Taxonomy in the 21st Century: Celebrating a New Chapter—First Impact Factor Received)
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