Johann Georg Wagler

thumb|250px|Johann Georg Wagler

Johann Georg Wagler (28 March 1800 – 23 August 1832) was a German herpetologist He worked on the extensive collections brought back from Brazil by Spix, and published partly together with him books on reptiles from Brazil. Wagler wrote Monographia Psittacorum (1832), Altractus Wagleri, Podacris Waglerianus and Tropidolaemus Wagleri (Beolens, Watkins & Grayson, 2011). Wagler had also made a contribution in describing the taxonomic arrangement of psittacine fauna, parrots and cockatoos, some of which are established in the systematic classification of these birds (Wagler, 1832). Wagler's contributions to the scientific community in general, ornithology and herpetology in particular, have withstood the test of time for more than one hundred years. Wagler's works are used nowadays as the foundation for new discoveries, research and experiments in the fields of ornithology and herpetology (Kieckbusch, Mader, Kaiser & Mecke, 2018).

More recently, Wagler's discoveries and works have helped scientists to categorise and research some newfound species from the Iberian Peninsula (Ceríaco & Bauer, 2018). Scientists have also recently found a new species of snake in Indonesia that shared similarities with that of Wagler's discovery in the 1800s, the fossorial snake genus Cylindrophis Wagler 1828 (Kieckbusch, Mader, Kaiser & Mecke, 2018). The fossorial snake genus Cylindrophis Wagler, 1828 currently includes 13 species and is common and widely distributed in tropical Asia. There is evidence of existence in Sri Lanka (one species), mainland Southeast Asia including south-eastern China (three species), and the Malay Archipelago (ten species). All species in the genus seem viviparous and share a myriad of morphological characteristics, such as the lack of true gastrosteges, the presence of pelvic spurs, an extremely short tail with conspicuous coloration, and contrasting light and dark ventral blotches. Since the new species was recognised as Cylindrophis melanotus, it is important to discuss the taxonomic history of C. melanotus. The name C. melanotus was first created by Wagler in his Observationes along with the description of C. resplendens (synonym of C. ruffus).

The name showed up in its ablative form as "Cylindrophe melanoto." While at the time of discovery, a specimen was available to Wagler in the collection of the "Museo Lugdunensi Bat[avorum]" (now RMNH), Wagler also referred to a figure of "Tortricis melanoti" by Caspar Georg Carl Reinwardt (1773–1854), which was likely part of Heinrich Boie's (1794–1827) unpublished manuscript Erpétologie de Java. The nominative form "Cylindrophis melanotus" (nomen corrigendum) was instead listed by Wagler (1830) in an account for the genus Cylindrophis. Two further species, currently in synonymy with Cylindrophis melanotus, were described in the early 20th Century, C. celebensis Smith, 1927 from Sulawesi and C. heinrichi Ahl, 1933 from the Moluccan island of Halmahera. Wagler described his new species as possessing a light snout with dark mottling.

In 2008, a study was conducted to determine the important impacts for the nomenclature of Kinglet Calyptura Calyptura cristata as well as of its distribution (Stopiglia, Straker & Raposo, 2008). The work of Wagler was used to analyse the findings. A specimen (ZMB 2306) of Kinglet Calyptura Calyptura cristata retrieved in São Paulo by Friedrich Sellow (1789–1831) and Ignaz Franz J. M. von Olfers (1793–1872) was rediscovered in the ornithological collection of the Museum für Naturkunde (ZMB) in Berlin in 2007. Specimen ZMB 2306 has two labels: a label in red inscribed ‘Pipra tyrannulus Wagler and a green label from the original mount that identifies the specimen as Pipra (R.) tyrannulus. In relation to the species of Pipra tyrannulus Wagler, 1830, it appears that Wagler (1830) worked on a revision of the genus Pipra and proposed a new combination for ‘Regulus tyrannulus Lichtenstein’.

The name tyrannulus has been interpreted in two different ways throughout the course of history. Sclater considered Pipra tyrannulus Wagler, 1830, as a synonym of Calyptura cristata, whereas Hellmayr claimed Pipra tyrannulus Wagler, 1830, to be a new name for Pardalotus cristatus Vieillot, 1818. Breaking down the specimen and history, it is obvious that Wagler (1830) was first to publish the name tyrannulus. Although Wagler never claimed to be the author of the specific name, in accordance with the terms of the Code (ICZN 1999) he is, nevertheless, its author. Wagler never brought up tyrannulus as being a new name for cristatus. He instead mentioned Pardalotus cristatus as a synonym of Pipra tyrannulus.

Some of Wagler's works in the 1800s remains an interesting topic of discussion today among scientists within the fields of ontology and herpetology. The Curl-crested Aracari Pteroglossus beauharnaisii Wagler, 1832 is one of the most scientifically significant species in the family Ramphastidae (Costa, Pacheco & Silveira, 2017). Among its distinctive characteristics, its modified curly, shiny black crown feathers are one-of-a-kind in the family and are altered to an extent not similar in any other living bird species. The crown feathers, accompanied with the distinctive white throat, were considered enough in the past to include the species in the monotypic genus Beauharnaisius Bonaparte; nevertheless, molecular research have pointed out that it is embedded within the genus Pteroglossus Illiger, sister to P. bitorquatus. It is a southern Amazonian species, showing up around the lowlands area of northern Peru, north and central Bolivia and western and central Amazonian Brazil. The correct publication date of the species’ description and the species’ epithet spelling have been matter of a recent controversy.

Some argued that Pteroglossus beauharnaesii, treated in scientific literature as originally published by Wagler in Isis in 1832, was published earlier as Pteroglossus beauharnaisii by Wagler in 1831 in a daily Munich newspaper, Das Ausland, on 28 April 1831. Hence, beauharnaesii might be regarded as an incorrect subsequent spelling of beauharnaisii. However, others go against that reasoning, claiming that regardless being either an incorrect subsequent spelling of Pteroglossus beauharnaisii Wagler, 1831, or a universally used junior synonym, the name Pteroglossus beauharnaesii Wagler, 1832 need to be preserved as the valid name for the species according to Articles 23.9 and 33.3.1 of the International Code of Zoological Nomenclature (1999). Pteroglossus beauharnaesii was described by Wagler in honor of Prince August Karl Eugen Napoleon Beauharnais (1810–1835), Duke of Leuchtenberg.

In the original description, Wagler presented the type locality only as "Brasilia, prov. Pará"; and in Wagler's earlier work in 1831, he mentioned that Pteroglossus beauharnaesii was "collected in Pará" ("bei Para erlegten"), or "in vicinity of Para". The holotype's label shows only "Pará" as locality. The specimen that Wagler based the description of P. beauharnaesii was possibly obtained by L. Riedel in 1829 on the Rio Madeira, and thus the locality presented by Wagler was imprecise, yet also not incorrect. In fact, until 1889 most of the Brazilian Amazon region was occupied by the enormous "Province Grão-Pará", commonly referred to only as "Pará". In addition, the type locality given by Wagler possibly indicated the place from where the material collected in Amazonia during the Langsdorff expedition was shipped, the current city of Belém, which was formerly known as "Pará", capital of the homonymous province.

Publications

Several of Wagler's books and articles are available at the Biodiversity Heritage Library:

Natürliches System der Amphibien, mit vorangehender Classification der Säugethiere und Vögel. Ein Beitrag zur vergleichenden Zoologie (1830) (from: München). Co-writer: Richmond, Charles Wallace.
Einige mittheilungen über thiere Mexicos (1831) in Isis von Oken. pages 510-535.
Monographia Psittacorum (1832) (from: Munich). Co-writer: Wetmore, Alexander.
Serpentum Brasiliensium species novae ou Histoire naturelle des espèces nouvelles de serpens, recueillies et observées pendant le voyage dans l'intérieur du Brésil dans les années 1817, 1818, 1819, 1820 (1824) (from: Munich). Co-writer: Spix, Johann Baptist von.
The six articles appeared in the Isis between 1829 and 1832. The Preface by Sclater contains some biographical information.

Johann Georg Wagler

Publications

References

Further reading

External links