Grey T Gustafson

Northern Arizona University | NAU · Department of Biological Sciences

The temporal origin of Madagascar's extraordinary endemic diversity is debated. A preference for Cenozoic dispersal origins has replaced the classical view of Mesozoic vicariance in the wake of molecular dating. However, evidence of ancient origins is mounting from arthropod groups. Using phylogenetic 'tip-dating' analysis with fossils, we show tha...

Abstract. Adephaga is the second largest suborder of beetles (Coleoptera) and they serve as important arthropod predators in both aquatic and terrestrial ecosystems. The suborder is divided into Geadephaga comprising terrestrial families and Hydradephaga for aquatic lineages. Despite numerous studies, phylogenetic relationships among the adephagan...

Tailoring ultraconserved element (UCE) probe set design to focal taxa has been demonstrated to improve locus recovery and phylogenomic inference. However, beyond conducting expensive in vitro testing, it remains unclear how best to determine whether an existing UCE probe set is likely to suffice for phylogenomic inference or whether tailored probe...

The Notomicrus traili species group (Coleoptera: Noteridae) is a lineage of aquatic beetles distributed throughout South America and extends into Mexico and the West Indies. Previous research has revealed a species complex within this group, with multiple distinct clades sharing overlapping distributions and lineages attributed to N. traili and the...

The Notomicrus traili species group (Coleoptera: Noteridae) is a lineage of aquatic beetles distributed throughout South America and extends into Mexico and the West Indies. Previous research has revealed a species complex within this group, with multiple distinct clades sharing overlapping distributions and lineages attributed to N. traili and the...

Tailoring ultraconserved element (UCE) probe set design to focal taxa has been demonstrated to improve locus recovery and phylogenomic inference. However, beyond conducting expensive in vitro testing, it remains unclear how best to determine whether an existing UCE probe set is likely to suffice for phylogenomic inference, or if tailored probe desi...

Eighteen species and four genera of the family Gyrinidae are recorded from Thailand. Seven species, belonging to three genera in the tribes Dineutini and Gyrinini, are here treated in detail. Dineutus sitesi Gustafson, Hájek & Miller, D. spinosus (Fabricius), D. unidentatus Aubé, Porrorhynchus marginatus Laporte and Gyrinus sericeolimbatus Régimbar...

We review Dineutus helleri Ochs, 1925, a whirligig beetle species endemic to New Guinea’s north coast mountains. Its diagnostic characters are illustrated for easy species identification. We provide a summary and geographic interpretation of historical records, provide new records and, for the first time, habitat photographs for the subspecies D. h...

Whirligig beetles (Coleoptera: Gyrinidae) are among the best swimmers of all aquatic insects. They live mostly at the water’s surface and their capacity to swim fast is key to their survival. We present a minimal model for the viscous and wave drags they face at the water’s surface and compare them to their thrust capacity. The swimming speed acces...

Beetles are arguably the most diverse group of animals on Earth with over 400 000 described species. Yet the timing of main diversification events among these insects remains debated. The use of phylogenomic data generated using next‐generation sequencing recently resolved most recalcitrant phylogenetic relationships across Coleoptera. However, lim...

A survey of the whirligig beetles of the genus Patrus Aubé, 1838 occurring in Thailand belonging to the newly designated Patrus landaisi species group is presented. Three new species are described and illustrated: P. garuda sp. nov., P. nanensis sp. nov. and P. phetchabunensis sp. nov.; with P. apicalis (Régimbart, 1891), P. landaisi (Régimbart, 18...

Burmese amber is well known for preserving unique extinct lineages of insects. Here, we describe a new fossil beetle in its larval stage from Burmese amber. Bayesian and parsimony phylogenetic analysis of 50 morphological characters support this fossil as being sister to both the tribes Dineutini and Orectochilini, representing an extinct stem line...

Diving beetles in the genus Platynectes (s. str.) in South America are relatively large and charismatically colored, yet relatively rare in museum collections. Recent fi eldwork in northern and central South America has resulted in the collection of hundreds of new specimens that substantially expand our distributional knowledge of the genus. Here,...

Hydaticus aequalis sp. n. is described from Brazil, where it was recently discovered in the central lowlands region of the Amazon forest. The new species differs from all other Neotropical congeners by its uniformly brown dorsal surface and the shape of medial lobe. The dorsal habitus and male genitalia are illustrated, and a distribution map is pr...

Burmese amber is well known for preserving unique extinct lineages of insects. Here, we describe a new fossil beetle in its larval stage from Burmese amber. Bayesian and parsimony phylogenetic analysis of 50 morphological characters support this fossil as being sister to both the tribes Dineutini and Orectochilini, representing an extinct stem line...

A unique feature among bees is the ability of some species of Megachile Latreille s.l. to cut and process fresh leaves for nest construction. The presence of a razor between the female mandibular teeth (interdental laminae) to facilitate leaf-cutting (LC) is a morphological novelty that might have triggered a subsequent diversification in this grou...

Targeted capture and enrichment approaches have proven effective for phylogenetic study. Ultraconserved elements (UCEs) in particular have exhibited great utility for phylogenomic analyses, with the software package phyluce being among the most utilized pipelines for UCE phylogenomics, including probe design. Despite the success of UCEs, it is beco...

A unique feature among bees is the ability of some species of Megachile s.l. to cut and process fresh leaves for nest construction. The presence of razors between the female mandibular teeth (interdental laminae) to facilitate leaf-cutting (LC) is a morphological novelty that might have triggered a subsequent diversification in this group. However,...

The whirligig beetle genus Aulonogyrus Motschulsky, 1853 comprises more than fifty species divided among five subgenera. The genus has high endemicity in southern Africa, with additional endemic species found on Madagascar, Australia, and New Caledonia. This distribution has been proposed to be of Gondwanan origin. In Africa and Madagascar, species...

The Venezuelan species of the genus Gyrinus Geoffroy, 1762 are reviewed (Gyrinidae: Gyrininae: Gyrinini). The Venezuelan Gyrinus fauna is found to be comprised of nine species distributed among the subgenera Neogyrinus Hatch, 1926 and Oreogyrinus Ochs, 1935, although Gyrinus (Oreogyrinus) colombicus Régimbart, 1883 is known from imprecisely localiz...

The larvae of the Malagasy whirligig beetle Dineutus sinuosipennis Laporte, 1840, identified using DNA sequence data, are described and illustrated for the first time, including detailed morphometric and chaetotax-ic analyses of selected structures and a description of larval habitat. Larvae of the genus Dineutus Macleay, 1825 are diagnosed, and a...

A new species of Dineutus Macleay, 1825 is described from the Southeastern CoastalPlain of the United Sates. Habitus and aedeagus images as well as illustrations of elytralapices, protarsus, palps, and male mesopretarsal claws are provided for Dineutus shorti n.sp. and compared to those of D. discolor Aubé, 1838. The importance of theSoutheastern C...

The Malagasy endemic whirligig beetle Heterogyrus milloti Legros, 1953 is redescribed. Jumping behavior of H. milloti is reported here for the first time with video recordings provided. Results of a behavioral experiment conducted in the field demonstrate H. milloti jumps in a targeted manner in a downstream direction. The unique habitat of H. mill...

The beetle suborder Adephaga has been the subject of many phylogenetic reconstructions utilizing a variety of data sources and inference methods. However, no strong consensus has yet emerged on the relationships among major adephagan lineages. Ultraconserved elements (UCEs) have proved useful for inferring difficult or unresolved phylogenies at var...

The phylogeny and evolutionary history of the whirligig beetle tribe Dineutini are inferred from the analysis of 56 morphological characters and DNA sequence data from the mitochondrial gene fragments COI, COII and 12S, and the nuclear gene fragments H3 and arginine kinase. Bayesian and maximum likelihood analyses were performed. A Bayesian tip-dat...

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, 1...

The Southeast Asian whirligig beetle genus Porrorhynchus Laporte, 1835 is revised. The genus is composed of five species, P. depressus Régimbart, 1892, P. indicans (Walker, 1858), P. landaisi Régimbart, 1892, P. marginatus Laporte, 1835, and P. misoolensis (Ochs, 1955), new status, and two subgenera, Porrorhynchus s. str. and Rhomborhynchus Ochs, 1...

Two new species of Dineutus Macleay, 1825 (Coleoptera: Gyrinidae) are described and illustrated: Dineutus barong sp. nov. from Bali, Indonesia and Dineutus sitesi sp. nov. from Thailand. A checklist to the species of the Dineutus s. str. is provided, as is a key to the species currently recognized in the subgenus together with illustrations of habi...

The Neotropical species of Platynectes Régimbart, 1879 sensu stricto (Coleoptera: Dytiscidae: Agabinae: Platynectini) are arranged into three newly proposed species groups based on the coloration of the venter: the P. submaculatus species group, the P. agallithoplotes species group, and the P. nigerrimus species group. The species of the P. submacu...

The larvae of the grooved whirligig beetle Macrogyrus oblongus (Boisduval, 1835) are described and illustrated including detailed morphometric and chaetotaxic analyses of selected structures. Larvae of Macrogyrus Régimbart, 1882 exhibit the characters traditionally recognised as autapomorphies of the Gyrinidae. The first instars bear egg bursters o...

A new species of Dineutus Macleay, 1825 is described from the Southeastern Coastal Plain of the United States. Habitus and aedeagus images as well as illustrations of elytral apices, protarsus, palps, and male mesotarsal claws are provided for Dineutus shorti n. sp. and compared to those of D. discolor Aubé, 1838. The importance of the southeastern...

All New World members of the whirligig beetle genus Dineutus Macleay, 1825 are treated. The New World Dineutus are found to be composed of 18 species and 6 subspecies: one species, Dineutus mexicanus Ochs, 1925, stat. n. is elevated from subspecies to species rank, and the subspecies Dineutus carolinus mutchleri Ochs, 1925, syn. n. is synonymized h...

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How many species of beetles are there in French Guiana? A first analysis of TAXREF database. This paper analyzes the Coleoptera part of the first global checklist of insects from French Guiana, up to the end of 2013, published online in the French species database TAXREF (http://inpn.mnhn.fr). We describe the level of knowledge by family, the pace...

The burrowing water beetle genus Liocanthydrus Guignot, 1957 is redefined and its species are revised. Of the four current species, three are recognized as belonging to the genus and redescribed: L. angustus (Guignot, 1957), L. octoguttatus (Zimmermann, 1921) and L. uniformis (Zimmermann, 1921). The fourth species, L. buqueti (Laporte, 1835) is fou...

All available genus- and family- group nomina for the Gyrinidae (Coleoptera: Adephaga) are listed along with original citation, original and current status, type nominal taxon with method of designation, and known synonymies and incorrect subsequent spellings. The nomina included follow the most current classification. Discussion is provided clarif...

Within Gyrinidae, the tribe Enhydrini is predominantly composed of large and conspicuous whirligig beetles that frequent a variety of habitats from lotic to lentic waters. Of the enhydrines, the Indo-Pacific genus Porrorhynchus is one of the most charismatic members, with several species representing the largest of the known whirligig beetles. Desp...

The water scavenger beetle genus Phaenostoma d'Orchymont, 1937 is reviewed and redescribed. Two new species are described: P. kontax sp. nov. (Peru) and P. stochasma sp. nov. (Costa Rica, Venezuela). The only previously known species, P. posticatum (Sharp, 1887) is newly recorded from Costa Rica and redescribed. A key to known species of the genus...

The genus Guyanobius Spangler, 19862. Spangler , P. J. 1986 . ‘A new genus and species of water scavenger beetle, Guyanobius adocetus, from Guyana and its larva (Coleoptera: Hydrophilidae: Hydrobiinae)’ . Proceedings of the Entomological Society of Washington , 88 : 585 – 594 . [Web of Science ®]View all references is revised and expanded. Two spec...

Ampullae appear to be common in the larvae of some chrysomelid subfamilies. We describe and discuss the occurrence and use of these structures in larvae of Labidomera clivicollis (Kirby), on its host plant Asclepias verticillata L. (Asclepiadaceae) under field and lab conditions. Through film footage, we reveal that ventral ampullae are apparent on...