Abstract:M. (2010). Deep cox1 divergence and hyperdiversity of Trigonopterus weevils in a New Guinea mountain range (Coleoptera, Curculionidae).-Zoologica Scripta, 39, 63-74.Trigonopterus is a little-known genus of flightless tropical weevils. A survey in one locality, the Cyclops Mountains of West New Guinea, yielded 51 species, at least 48 of them undescribed. In this study, we show that mtDNA sequencing, or DNA barcoding, is an effective and useful tool for rapid discovery and identification of these species, most o… Show more
“…This early occurrence in New Guinea deviates from recent geological evidence suggesting a more recent emergence of New Guinea, although some amount of land and possibly even altitude might have been available at the time in a proto-Papuan archipelagic setting [15,52,56–58]. Even small geographical areas, as long as they have some higher elevations, might feature a rather diverse Trigonopterus fauna as was shown for the Cyclops Mountains of Papua with 54 species found mainly along a single transect [35,41]. Figure 3.Palaeobiogeography of New Caledonian Trigonopterus .…”
The origin of the astonishing New Caledonian biota continues to fuel a heated debate among advocates of a Gondwanan relict scenario and defenders of late oceanic dispersal. Here, we study the origin of New Caledonian Trigonopterus flightless weevils using a multimarker molecular phylogeny. We infer two independent clades of species found in the archipelago. Our dating estimates suggest a Late Miocene origin of both clades long after the re-emergence of New Caledonia about 37 Ma. The estimation of ancestral ranges supports an ancestral origin of the genus in a combined region encompassing Australia and New Guinea with subsequent colonizations of New Caledonia out of New Guinea in the mid-Miocene. The two New Caledonian lineages have had very different evolutionary trajectories. Colonizers belonging to a clade of foliage dwellers greatly diversified, whereas species inhabiting leaf-litter have been less successful.
“…This early occurrence in New Guinea deviates from recent geological evidence suggesting a more recent emergence of New Guinea, although some amount of land and possibly even altitude might have been available at the time in a proto-Papuan archipelagic setting [15,52,56–58]. Even small geographical areas, as long as they have some higher elevations, might feature a rather diverse Trigonopterus fauna as was shown for the Cyclops Mountains of Papua with 54 species found mainly along a single transect [35,41]. Figure 3.Palaeobiogeography of New Caledonian Trigonopterus .…”
The origin of the astonishing New Caledonian biota continues to fuel a heated debate among advocates of a Gondwanan relict scenario and defenders of late oceanic dispersal. Here, we study the origin of New Caledonian Trigonopterus flightless weevils using a multimarker molecular phylogeny. We infer two independent clades of species found in the archipelago. Our dating estimates suggest a Late Miocene origin of both clades long after the re-emergence of New Caledonia about 37 Ma. The estimation of ancestral ranges supports an ancestral origin of the genus in a combined region encompassing Australia and New Guinea with subsequent colonizations of New Caledonia out of New Guinea in the mid-Miocene. The two New Caledonian lineages have had very different evolutionary trajectories. Colonizers belonging to a clade of foliage dwellers greatly diversified, whereas species inhabiting leaf-litter have been less successful.
“…We have previously established that Trigonopterus are suitable for accelerated taxonomic study combining morphology and the DNA barcoding approach using mitochondrial cox1 data (Riedel et al 2010; Tänzler et al 2012). Trigonopterus species were clearly delineated by both molecular data (nuclear as well as mitochondrial sequences) and morphology, and both data sets were fully compatible.…”
“…This genus has a marked tendency towards local species endemism, but despite the inability to fly, Trigonopterus has a wide range, from east Sumatra across Melanesia to the Samoan islands. It is hyperdiverse in New Guinea, with more than 300 species recorded [17,18]. Although only a single species has been described from Sulawesi to date, we have more than 100 new species awaiting formal description (A.…”
The fauna of Bali, situated immediately west of Wallace's Line, is supposedly of recent Javanese origin and characterized by low levels of endemicity. In flightless Trigonopterus weevils, however, we find 100% endemism for the eight species here reported for Bali. Phylogeographic analyses show extensive in situ differentiation, including a local radiation of five species. A comprehensive molecular phylogeny and ancestral area reconstruction of Indo-Malayan-Melanesian species reveals a complex colonization pattern, where the three Balinese lineages all arrived from the East, i.e. all of them transgressed Wallace's Line. Although East Java possesses a rich fauna of Trigonopterus, no exchange can be observed with Bali. We assert that the biogeographic picture of Bali has been dominated by the influx of mobile organisms from Java, but different relationships may be discovered when flightless invertebrates are studied. Our results highlight the importance of in-depth analyses of spatial patterns of biodiversity.
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