Two new Brazilian species of Chelodesmidae of the genera Iguazus and Tessarithys (Diplopoda: Polydesmida)

Bouzan, Rodrigo Salvador; Pena-Barbosa, João P. P.; Brescovit, Antônio D.

doi:10.3897/zoologia.34.e19986

Cited by 3 publications

(1 citation statement)

References 10 publications

(9 reference statements)

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“…Somatic characters are shared by many genera within the Chelodesmidae and generic placement and species identification have been traditionally based on gonopodal morphology (Hoffman 1971, Pena-Barbosa et al 2013, Bouzan et al 2017a. Female genitalic characters have been largely neglected, seldom examined, and rarely photographed or illustrated (Brölemann 1902;Schubart 1946;Hoffman 1990aHoffman , 1990bHoffman , 2000Pena-Barbosa et al 2013;Bouzan et al 2017bBouzan et al , 2018aBouzan et al , 2018b.…”

Section: Introductionmentioning

confidence: 99%

A case of mass occurrence of Sandalodesmus araujoi () in a municipality of São Paulo, Brazil and description of the heretofore unknown female (Polydesmida, Chelodesmidae)

Bouzan,

Means,

Ivanov

et al. 2023

Biota Neotrop.

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Somatic characters are shared by many Chelodesmidae groups, and generic placement and species identifications traditionally have been based on gonopodal morphology. Female genitalic characters have been largely neglected and are rarely photographed or illustrated. This is rather unfortunate as the morphology of female genitalia presents important characters and may be decisive for developing a more robust family classification. We describe the heretofore unknown female of Sandalodesmus araujoi (Schubart, 1946), previously known only from the male holotype collected in São Paulo, Brazil in December 1943; discuss the utility of female genitalic characters for species delineation in Sandalodesmus; and report the first case of a mass occurrence in the Chelodesmidae. While an attempt at a formal diagnosis of Sandalodesmus females based on genitalic characters is premature, the vulvar morphology of the three taxa examined in this study suggests that female genitalia are species-specific. Some characters (i.e., asymmetric valves, presence of digitiform projections and reduction of setae on the internal basal portion of the valves) are constant between the species, suggesting utility for generic-level delineation. Mass occurrences of millipedes are typically unpredictable and likely related to variations in environmental conditions and/or anthropogenic modifications of natural habitats. Although the mass occurrence of S. araujoi reported herein was only observed once, the event coincides with the mating period of millipedes during the rainy season in Brazil. On the other hand, the region where the species was found has been the target of intense urban development, including replacement of natural habitats with residential areas, which may have influenced its population dynamics.

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Section: Introductionmentioning

confidence: 99%

A case of mass occurrence of Sandalodesmus araujoi () in a municipality of São Paulo, Brazil and description of the heretofore unknown female (Polydesmida, Chelodesmidae)

Bouzan,

Means,

Ivanov

et al. 2023

Biota Neotrop.

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A new record after a century and description of the female ofPlectrogonodesmus gounellei(Brölemann 1902) (Polydesmida: Chelodesmidae)

Bouzan

Iniesta

Souza

et al. 2018

Studies on Neotropical Fauna and Environment

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No Tömösváry organ in flat backed millipedes (Diplopoda, Polydesmida)

Moritz‍

Koch

2020

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The Tömösváry organ is a sensory structure of the head in myriapods and some other terrestrial arthropods. Due to its variable shape, size, and position in millipedes (Diplopoda) the Tömösváry organ is commonly used as diagnostic character in taxonomic descriptions and often included in phylogenetic analyses. For the Polydesmida, the largest millipede order, the Tömösváry organ is inconsistently stated as being either absent or present as a pear-shaped pit covered by a membrane or cuticular disc. In order to resolve this inconsistency, we investigated the morphology of the presumable Tömösváry organ in four polydesmidan species based on paraffin-histology, semi-thin sections and micro-computed tomography. Our results unambiguously favor the view that the articulation of the cephalic tentorium with the head capsule was misidentified as the Tömösváry organ in previous studies, and thus that the Tömösváry organ indeed is absent in the Polydesmida. The pear-shaped pit proved to represent the distal roundish expansion of the incisura lateralis, to which – similarly as in julidan millipedes – the tentorial transverse bar is articulated. The absence of the Tömösváry organ in the Polydesmida does not affect the topology of the interrelationships among the millipede orders retrieved in previous cladistic analyses based on morphology. As a character shared by Colobognatha and Juliformia, however, absence of a Tömösváry organ in Polydesmida favors the optimization of its presence in nematophoran millipedes as a reversal. Further studies are needed to clarify whether among chilognathan millipedes a Tömösváry organ really exists in taxa such as Stemmiulida, and whether the Tömösváry organs are homologous across millipedes.

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Two new Brazilian species of Chelodesmidae of the genera Iguazus and Tessarithys (Diplopoda: Polydesmida)

Cited by 3 publications

References 10 publications

A case of mass occurrence of Sandalodesmus araujoi () in a municipality of São Paulo, Brazil and description of the heretofore unknown female (Polydesmida, Chelodesmidae)

A case of mass occurrence of Sandalodesmus araujoi () in a municipality of São Paulo, Brazil and description of the heretofore unknown female (Polydesmida, Chelodesmidae)

A new record after a century and description of the female ofPlectrogonodesmus gounellei(Brölemann 1902) (Polydesmida: Chelodesmidae)

No Tömösváry organ in flat backed millipedes (Diplopoda, Polydesmida)

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