The first terrestrial isopod (Crustacea: Isopoda: Oniscidea) from Cretaceous Burmese amber of Myanmar

Broly, Pierre; Maillet, Sébastien; Ross, Andrew

doi:10.1016/j.cretres.2015.02.012

Cited by 35 publications

(22 citation statements)

References 39 publications

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“…More recently, the area containing the source of Burmese amber has been interpreted as having been on the West Burma terrane instead; see Broly et al (2015: Fig. 1) for a map of how the various elements may have accreted together to form modern Myanmar.…”

Section: Palaeobiogeographymentioning

confidence: 99%

Amblyomma birmituma new species of hard tick in Burmese amber

et al. 2017

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SUMMARYAmblyomma birmitum sp. nov. is formally described as a new record from 99 Ma old Burmese amber from Myanmar. This confirms the presence of the extant hard tick genus Amblyomma C.L. Koch, 1844 (Ixodida: Ixodidae) in the Late Cretaceous. This discovery is placed in its wider context and some reports of fossil hard ticks, such as a Hyalomma C.L. Koch, 1844 in Eocene Baltic amber, are misidentifications. The genus Amblyomma belongs to the clade Metastriata, a group which probably also accommodates two extinct genera, Cornupalpatum Poinar and Brown, 2003 and Compluriscutata Poinar and Buckley, 2008, also found in Burmese amber. All three fossils are thus only a little younger than published molecular divergence time estimates (ca. 124 ± 17 Ma) for the Metastriata lineage. Amblyomma has a largely Gondwanan distribution today. However, in some biogeographical scenarios, e.g. the Samafrica model, its predicted radiation time postdates the dissolution of the original Gondwana supercontinent raising questions about how its current distribution pattern was achieved.

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Section: Palaeobiogeographymentioning

confidence: 99%

Amblyomma birmituma new species of hard tick in Burmese amber

et al. 2017

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“…The subsequent period was characterized by a steep decline in oxygen content by more than half (striped area; Huey and Ward, 2005), which might have selected for body plan innovations such as the inclusion of air within the brood pouch. The period between the invasion of land and the earliest evidence of brooding terrestrial isopods (star and circle; Broly et al, 2013Broly et al, , 2015Broly et al, , 2017 suggests that changing atmospheric oxygen concentrations might have promoted novel adaptations for life on land. Time is given as means and 95% confidence intervals.…”

Section: Catch-up Growth As An Evolutionary Strategymentioning

confidence: 99%

“…Colonization of land appeared in two major waves, each corresponding with high atmospheric oxygen content: the first invasion occurred between 425 and 360 million years ago (Mya) and was followed by a second one beginning approximately 345 Mya (Berner et al, 2007;Ward et al, 2006). Isopods -the most successful terrestrial colonizers among crustaceans (>3600 species; Schmalfuss, 2003) -invaded land during the second major wave (Broly et al, 2013(Broly et al, , 2015, when atmospheric oxygen content reached its maximum value (Fig. 3), indicating relaxed conditions for processes with high oxygen demands.…”

Section: Catch-up Growth As An Evolutionary Strategymentioning

confidence: 99%

An evolutionary solution of terrestrial isopods to cope with low atmospheric oxygen levels

Horváthová

Antoł

Czarnołęski

et al. 2017

Journal of Experimental Biology

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The evolution of current terrestrial life was founded by major waves of land invasion coinciding with high atmospheric oxygen content. These waves were followed by periods with substantially reduced oxygen concentration and accompanied by the evolution of novel traits. Reproduction and development are limiting factors for evolutionary water-land transitions, and brood care has probably facilitated land invasion. Peracarid crustaceans provide parental care for their offspring by brooding the early stages within the motherly brood pouch, the marsupium. Terrestrial isopod progeny begin ontogenetic development within the marsupium in water, but conclude development within the marsupium in air. Our results for progeny growth until hatching from the marsupium provide evidence for the limiting effects of oxygen concentration and for a potentially adaptive solution. Inclusion of air within the marsupium compensates for initially constrained growth in water through catch-up growth, and it may explain how terrestrial isopods adapted to short-and long-term changes in oxygen concentration.

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“…The terrestrial isopods described prior to Broly et al (2015) were known only from Cenozoic facies, although Lins et al (2012), using molecular dating techniques on modern taxa, asserted that the Oniscidea and other isopod suborders appeared prior to the Mesozoic, perhaps as early as Carboniferous or Late Devonian. The suborder Asellota may fossilize poorly, owing to their thin cuticle, and were currently unreported in the fossil literature, despite Lins et al (2012) estimating their age in the late Paleozoic.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, while fossil isopods are known from numerous suborders (Hessler, 1969;Etter, 2014;Jones et al, 2014;Klompmaker et al, 2014;Broly et al, 2015), until now, no members of the large and diverse suborder Asellota, comprising marine and freshwater forms, have been described from the fossil record. Here, we describe a new genus and species of asellote isopod based on two specimens from the Upper Triassic (Norian) of the Carnic Prealps (Friuli, northeastern Italy).…”

Section: Introductionmentioning

confidence: 99%

First fossil asellote (Isopoda: Asellota), from the Upper Triassic (Norian) of the Carnic Prealps (Friuli, northeastern Italy)

Selden

Wilson

Simonetto

et al. 2016

Journal of Crustacean Biology

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A B S T R A C TThe first asellote isopod from the fossil record is described here as Fornicaris calligarisi Wilson and Selden, n. gen. and sp. The two specimens, both probably males, showing dorsal morphology, come from loose material of the Dolomia di Forni Formation in the bed of the Tagliamento River below the town of Forni di Sotto, Udine Province, Friuli Venezia Giulia Autonomous Region, northeastern Italy. The Dolomia di Forni Formation is Triassic (Norian) in age, and the fossils date from approximately 210-215 Ma. Characters such as narrow, elongate eye stalks, tiny uropods, and enlarged first pereionite (found in terminal males) place the fossil within the Paramunnidae. Parsimony analysis using TNT placed the fossil within the Austrosignum-Munnogonium species complex. The robust pereiopods with hooked tips, elongate and robust carpus and propodus of pereiopod I, axial compression of the pereion, and the large size of the fossils (>2× related extant taxa) are features particular to the fossil genus and species.KEY WORDS: Dolomia di Forni Formation, Janiroidea, Paramunnidae DOI: 10.1163/1937240X-00002387 INTRODUCTIONIsopods are common inhabitants of marine, freshwater, and humid terrestrial environments, but not plentiful as fossils. In particular, while fossil isopods are known from numerous suborders (Hessler, 1969;Etter, 2014;Jones et al., 2014;Klompmaker et al., 2014;Broly et al., 2015), until now, no members of the large and diverse suborder Asellota, comprising marine and freshwater forms, have been described from the fossil record. Here, we describe a new genus and species of asellote isopod based on two specimens from the Upper Triassic (Norian) of the Carnic Prealps (Friuli, northeastern Italy).A cursory examination of these specimens suggested they showed ventral views of the cycloid Halicyne von Meyer, 1844, which is not uncommon in the Triassic of Europe (von Meyer, 1847;Trümpi, 1957;Merki, 1961; Gall and Grauvogel, 1967;Gall, 1971). Even though the ventral appendages of cycloids are poorly preserved, what is known about them is that they have fewer appendages, with fewer podomeres, than the fossil described here, no well-developed anterior grasping appendage. A single, large carapace is always visible (Dzik, 2008). Further investigation proved that the animals from Friuli are isopod crustaceans.Although isopods appear frequently among Mesozoic strata (Etter, 2014), some groups apparently do not fossilize * Corresponding author; e-mail: paulselden@mac.com well and have been slow to be reported in the literature. The terrestrial isopods described prior to Broly et al. (2015) were known only from Cenozoic facies, although Lins et al. (2012), using molecular dating techniques on modern taxa, asserted that the Oniscidea and other isopod suborders appeared prior to the Mesozoic, perhaps as early as Carboniferous or Late Devonian. The suborder Asellota may fossilize poorly, owing to their thin cuticle, and were currently unreported in the fossil literature, despite Lins et al. (2012) estimating the...

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The first terrestrial isopod (Crustacea: Isopoda: Oniscidea) from Cretaceous Burmese amber of Myanmar

Cited by 35 publications

References 39 publications

Amblyomma birmituma new species of hard tick in Burmese amber

Amblyomma birmituma new species of hard tick in Burmese amber

An evolutionary solution of terrestrial isopods to cope with low atmospheric oxygen levels

First fossil asellote (Isopoda: Asellota), from the Upper Triassic (Norian) of the Carnic Prealps (Friuli, northeastern Italy)

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