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

• Autorzy: Fikacek M. , Gustafson G.T. , Short A.E.Z.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

wet rock; immature stage; Tritonus complanatus; Tormus; Oocyclus; Hydrobius; morphology; larva; beetle; cascade beetle; spiracle; Coleoptera; Hydrophilidae; Laccobiini; Madagascar

• Wydawca: -
• Czasopismo: Annales Zoologici
• Rocznik: 2017
• Tom: 67
• Numer: 1
• Opis fizyczny: p.91-107,fig.,ref.

Twórcy

autor

Fikacek M.

• Department of Entomology, National Museum in Prague, Cirkusova 1740, CZ-19300 Praha 9 - Horni Pocenice, Czech Republic
• Department of Zoology, Faculty of Science, Charles University in Prague, Vinicna 7, CZ-12843 Praha 2, Czech Republic

autor

Gustafson G.T.

• Division of Entomology, Department of Ecology and Evolutionary Biology, Biodiversity Institute, University of Kansas, 1200 Sunnyside Avenue, Lawrence, KS 66045, USA

autor

Short A.E.Z.

• Division of Entomology, Department of Ecology and Evolutionary Biology, Biodiversity Institute, University of Kansas, 1200 Sunnyside Avenue, Lawrence, KS 66045, USA

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Identyfikatory

DOI

10.3161/00034541ANZ2017.67.1.011