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Morphologically intermediate form between Athous haemorrhoidalis and A. vittatus (Coleoptera: Elateridae): a case of hybridization? A preliminary study

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Wysocka A., Kaczmarczyk A., Buchholz L., Sell J.

Annales Zoologici

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2011

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tom 61

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nr 4

In the present preliminary study we report an investigation on taxonomic status of individuals displaying diagnostic traits of intermediate values between the morphologically typical forms of Athous haemorrhoidalis (Fabricius 1801) and A. vittatus (Gmelin 1790) species occurring sympatrically. The presence of the "intermediate form" invoked the hypothesis of interspecific hybridization between A. haemorrhoidalis and A. vittatus species. An alternative explanation is that the "intermediate form" comprises individuals that are morphological variants of either of the species, without interspecific gene flow. We used partial sequences of two mitochondrial genes coding for the cytochrome oxidase subunit I (cox1) and 16S ribosomal RNA (rrnL), respectively. Additionally, we examined the variability of five polymorphic allozyme loci: 6Pgd, Idh, Mdh, Pgm and Gpi. Altogether, 28 A. haemorrhoidalis, 7 A. vittatus and 8 "intermediate form" individuals were included into the study. Phylogenetic analyses produced the trees of a consistent topology with high statistical support regardless of the method used. The specimens signified as the "intermediate form" constituted a monophyletic group with individuals of A. vittatus species. Empirical data confirmed that the reproductive isolation between the species studied is complete. No haplotype was shared between A. haemorrhoidalis and A. vittatus in sympatry. Similar results were obtained using the analysis of allozyme data. Especially at Idh and 6Pgd loci, alleles characteristic for A. vittatus and the "intermediate form" were not found in A. haemorrhoidalis, despite the larger sample examined. This suggests that the "intermediate form" is a phenotypic variant of A. vittatus without the signature of introgression.

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Calyxdendrum graptoloides n. gen., n. sp. - a graptolite intermediate between the Dendroidea and the Graptoloidea

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Kozlowski R.

Acta Palaeontologica Polonica

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1960

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tom 05

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nr 2

Specimens of the graptolite here described under the name of Calyxdendrum graptoloides n. gen., n. sp. have been etched from erratic boulders of Middle Ordovician age. This form unites certain characters of the two orders : Dendroidea and Graptoloidea . As in the Dendroidea the rhabdosome here consists of 3 categories of thecae, with triad budding, while the sicula is the same as in the Graptoloidea , i. e. conical and provided with a nema.

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Decouverte d'un Rhabdopleuride (Pterobranchia) Ordovicien

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Kozlowski R.

Acta Palaeontologica Polonica

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1961

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tom 06

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nr 1

L'auteur a décrit des échantillons fragmentaires d'un organisme colonial à squelette formé de substance chitinoïde, dont la structure concorde dans ses traits essentiels avec la structure du tubarium de Rhabdopleura (Pterobranchia). Les restes de cet animal, auquel est appliqué le nom de Rhabdopleuroides exspectatus n. gen., n. sp., ont été extraits de six galets erratiques d'âge allant de l'Ordovicien moyen à l'Ordovicien supérteur.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

1 Annales Zoologici

2 Kozlowski R.

1 Buchholz L.

1 Kaczmarczyk A.

1 Sell J.

1 Wysocka A.

1 2011

1 1961

1 1960

Morphologically intermediate form between Athous haemorrhoidalis and A. vittatus (Coleoptera: Elateridae): a case of hybridization? A preliminary study

Calyxdendrum graptoloides n. gen., n. sp. - a graptolite intermediate between the Dendroidea and the Graptoloidea

Decouverte d'un Rhabdopleuride (Pterobranchia) Ordovicien