03249nas a2200217 4500008004100000022001400041245007700055210007200132260001500204300001200219490000800231520262600239653001202865653001402877653003002891653001502921653001402936100001702950700001702967856004702984 2020 eng d a1313-298900aNo Tömösváry organ in flat backed millipedes (Diplopoda, Polydesmida)0 aNo Tömösváry organ in flat backed millipedes Diplopoda Polydesmi c28/04/2020 a103-1150 v9303 a

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.

 

10aanatomy10aHistology10aMicro-Computed Tomography10amorphology10atentorium1 aMoritz, Leif1 aKoch, Markus uhttps://zookeys.pensoft.net/article/48438/