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1

An aquatic water scavenger beetle in Early Miocene amber from the Dominican Republic (Coleoptera: Hydrophilidae)

100%
Fikacek M., Engel M. S.
Annales Zoologici
|
2011
|
tom 61
|
nr 4
We describe a fossil hydrophilid beetle Anacaena paleodominica sp. nov. from the Early Miocene amber of the Dominican Republic, which is the only definitive amber inclusion of the family Hydrophilidae documented. The species belongs to the Recent Anacaena suturalis species group known from the Nearctic, Neotropical, and Australian regions. The fossil demonstrates that representatives of the species group may already have been widespread and common by the Early Miocene, and indicates a possible Miocene/post-Miocene extinction of the aquatic insect fauna on the island of Hispaniola.
2

Breaking a disjunct distribution: a review of the Southern hemisphere genera Cylorygmus and Relictorygmus gen. nov. (Hydrophilidae: Cylominae)

81%
Seidel M., Minoshima Y. N., Arriaga-Varela E., Fikacek M.
Annales Zoologici
|
2018
|
tom 68
|
nr 2
The southern hemisphere water scavenger beetle genus Cylorygmus Orchymont, 1933 (Coleoptera: Hydrophilidae: Cylominae) is revised. Three species are recognized, one in Chile and two in South Africa. The morphological differences indicate that the African species are not congeneric with the Chilean one. Relictorygmus gen. nov. is established for the African R. trevornoahi sp. nov. (type species) and R. repentinus (Hebauer, 2002), both known from few localities in the Western Cape province of the Republic of South Africa. The genus Cylorygmus with the only species C. lineatopunctatus Orchymont, 1933 is endemic to a small region in central Chile. Its larva is described in detail based on specimens collected in association with adults. Both genera and all species are diagnosed, described and illustrated, and an identification key for adults is provided. Our study demonstrates that the trans-Atlantic disjunct distribution of Cylorygmus was based on inaccurate taxonomie treatment and did not reflect the real evolutionary history of these beetles.
3

New Mesozoic Water Scavenger Beetles from the Yixian Formation in China (Coleoptera: Hydrophiloidea)

81%
Prokin A., Ren D., Fikacek M.
Annales Zoologici
|
2010
|
tom 60
|
nr 2
One new fossil genus and four new fossil species are described from the Late Tithonian-Berriasian Yixian Formation (Huangbanjigou) in China: Sinosperchopsis silinae gen. et sp. nov., Hydrophilopsia shatrovskiyi sp. nov., H. hydraenoides sp. nov. and H. gracilis sp. nov. (Coleoptera: Hydrophiloidea). The genus Sinosperchopsis is compared with all Mesozoic hydrophiloid genera known so far.
4

A review of andotypus and Austrotypus gen. nov., Rygmodine genera with an Austral Disjunction (Hydrophilidae: Rygmodinae)

81%
Fikacek M., Minoshima Y. N., Newton F.
Annales Zoologici
|
2014
|
tom 64
|
nr 4
The taxonomy and morphology of species related to the genus Andotypus Spangler, 1979 (Coleoptera: Hydrophiloidea: Hydrophilidae: Rygmodinae) are reviewed in detail. Austrotypus gen. nov. is established for A. nothofagi sp. nov. (eastern Australia) and A. peruanus sp. nov. (Peru), both of which share the same morphology of the mouthparts and mesoventrite. The germs Andotypus is found to be endemic to central and sourthern Chile, containing two species: A. ashworthi Spangler, 1979 and A. araucariae sp. nov. Andotypus perezdearcei Moroni, 2000 is found to belong to the genus Dactylosternum Wollaston, 1854 (Hydrophilidae: Sphaeridiinae: Coelostomatini), and is a junior subjective synonym of the introduced species D. abdominale (Fabricius, 1792). Adults of all species of Andotypus and Austrotypus are (re)described in detail and important characters are illustrated. Larval morphology and head chaetotaxy is described and illustrated in detail for Andotypus ashworthi and Austrotypus nothofagi, revealing differences in head morphology and abdominal tergites which support the separate status of both genera. The taxonomic position of the genera within the Rygmodinae is briefly discussed, but should be corroborated by formal phylogenetic analysis. We hypothesize that the austral disjunct distribution of Austrotypus as well as current distribution of Andotypus are results of the break-up of Gondwana combined with changes of climate in austral South America, Antarctica and Australia during the Cenozoic. Andotypus and Austrotypus represent an independently evolved lineage of dung- and carrion-associated beetles native to the southern temperate zone, and the fact that their larvae largely resemble those of Sphaeridium Fabricius, 1775 suggests that they may represent a partial ecological analogue of the Old World medium-sized coprophilous hydrophilids of the tribe Sphaeridiini. The syntopical co-occurrence of Austrotypus nothofagi with four similarly colored scarabaeoid dung-inhabiting beetles (Onthophagus sydneyensis Blackburn, 1903, O. arrilla Matthews, 1972, Lepanus ustulatus (Lansberge, 1874) and Liparochrus nanus Paulian, 1980) suggests that Austrotypus nothofagi may be a member of a mimetic complex formed by these species.
5

On wet rocks with snorkels: immature stages of Tritonus cascade beetles with unusual modification of spiracles (Coleoptera: Hydrophilidae: Laccobiini)

81%
Fikacek M., Gustafson G. T., Short A. E. Z.
Annales Zoologici
|
2017
|
tom 67
|
nr 1
The egg case and larvae of all three instars of the cascade beetle Tritonus complanatus Short, 2008 (Coleoptera: Hydrophilidae) are described based on specimens found co-occurring with adults and associated with them by comparing histone 3 nDNA sequences. The morphology of the larva is congruent with the phylogenetic position of Tritonus Mulsant, 1844 in the Paracymus-group of the Laccobiini, but also exhibits characters shared with larvae of Hydrobiusini, and some presumed adaptations to the hygropetric life style. The larva has open mesothoracic and abdominal spiracles situated on top of long spiracular tubes in the first instar, likely working as ‘spiracular snorkels’, and on low tubercles in later instars, along with a well-developed spiracular atrium. Similar spiracular morphology was found in the larva of the terrestrial laccobiine genus Tormus Sharp, 1884, and a brief examination of larvae of few other genera (Oocyclus Sharp, 1882, Hydrobius Leach, 1815) reveals that the peripneustic spiracular system (mesothoracic plus 8 abdominal functioning spiracles) may be more widespread in larval Hydrophilidae than currently believed.
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