<i>PAXILLITRILETES</i>, A NEW NAME FOR FOSSIL MEGASPORES HITHERTO INVALIDLY NAMED <i>TOMSONIA</i>

Hall, John W.; Nicolson, Dan H.

doi:10.2307/1218173

Cited by 29 publications

(25 citation statements)

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“…Scale bars -100 μm (A, C, E, F); 10 μm (B); 1 μm (D). the presence of temporary or semi-permanent water bodies in the Wealden succession, such as Arcellites, Minerisporites Potonié, 1956 andPaxillitriletes Hall andNicolson, 1973, supports this observation. Standard palynological preparations of the samples in which C. capelensis is relatively common suggest that deposition occurred in either fresh or slightly saline conditions, with most of the very few algal palynomorphs present (e.g.…”

Section: Discussionsupporting

confidence: 53%

An unusual megaspore of uncertain systematic affinity from Lower Cretaceous deposits in south-east England and its biostratigraphic and palaeoenvironmental significance

Batten

2009

Grana

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Batten, D. J. (2009). An unusual megaspore of uncertain systematic affinity from Lower Cretaceous deposits in south-east England and its biostratigraphic and palaeoenvironmental significance. Grana, 48(4), 270-280.An unusual megaspore has been recorded from beds within the Weald Clay Group of south-east England. Described as Clockhousea capelensis gen. et sp. nov., it is characterised by having a thick outer layer of exine consisting of closely packed columnar to clavate elements with constricted bases attached to a perforated inner layer and a sculpture that ranges from having the appearance of a negative reticulum through closely spaced verrucae to a mixture of verrucate and essentially baculate elements, all of which are surface manifestations and extensions of the underlying structure. These characters do not readily indicate a systematic relationship with any known heterosporous plant genus or family. The localised occurrence and relative abundance of the spores in a few beds suggest that some of the parent plants grew close to water bodies where they were deposited and preserved. Their recovery from sediments of late Hauterivian-early Barremian age indicates that the species has potential as a biostratigraphic marker in the upper Wealden succession of southern England and perhaps elsewhere.Peer reviewe

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Section: Discussionsupporting

confidence: 53%

An unusual megaspore of uncertain systematic affinity from Lower Cretaceous deposits in south-east England and its biostratigraphic and palaeoenvironmental significance

Batten

2009

Grana

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“…Monolete microspores similar to those of living Isoetes have been previously reported adherent to the surface sculpture of isoetalean megaspores: entangled in the capilli of Paxillitriletes vittatus Kovach and Dilcher, 1985 from the Cenomanian of Kansas (Kovach and Dilcher 1985), of Paxillitriletes alatus from the late Santonian of Georgia (Lupia 2011), of Paxillitriletes fairlightensis (Batten, 1969) Hall andNicolson, 1973 and of Dijkstraisporites helios (Dijkstra, 1951) Potonié, 1956 from the Barremian of Brilon-Nehden in Germany (Wilde and Helmsley 2000). Those monolete microspores adherent to Paxillitriletes fairlightensis, P. vittatus and Dijkstraisporites helios appear similar to those compared to Perinomonoletes Krutzsch, 1967 (Kovach andDilcher 1985;Wilde and Hemsley 2000).…”

Section: Discussionmentioning

confidence: 78%

A new isoetalean microsporophyll from the latest Albian of northeastern Spain: Diversity in the development and dispersal strategies of microspores

Villanueva‐Amadoz¹

2012

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“…of Sukh Dev (1961, M. auriculatus, P. cutchensis (Singh, Sriva-stava et Roy) Banerji, Jana et Maheshwari, 1984 and P. maheshwariensis Jana et Ghosh, 1997 from the Early Cretaceous of India all bear superficial similarities to P. rainei, but differ in one or more characters of the auriculae development, zona width, or proximal ornament shape. The only previously illustrated Jurassic megaspore from Australia, attributed to P. phyllicus (Murray) Hall et Nicholson, 1973(Filatoff, 1975) likely belongs to P. rainei, although the apical shape of its very robust proximal ornament is not clear. The type material of P. phyllicus differs from P. rainei in having more leaf-like and fused proximal sculptural elements (Murray, 1939, text-figures 7, 8).…”

Section: Holotype Nrm S089652 (Figure 11c D H)mentioning

confidence: 99%

Megaspore and microfossil assemblages reveal diverse herbaceous lycophytes in the Australian Early Jurassic flora

McLoughlin

Jansson

Vajda

2014

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Here, we describe and illustrate by transmitted light and scanning electron microscopy the first Australian Jurassic megaspore assemblages. The megaspores and other mesofossils were isolated from terrestrial deposits of the Marburg Subgroup (late Pliensbachian) at Inverleigh Quarry, Clarence-Moreton Basin, eastern Australia. Nine megaspore taxa are identified including one new species: Paxillitriletes rainei. Miospore assemblages recovered from the same samples at Inverleigh reveal a slightly higher diversity of lycophyte microspores. The collective megaspore suite from Inverleigh shares several genera with mid-Mesozoic assemblages from widely distributed parts of the world, but most of the Inverleigh species have subtle morphological differences from congeneric forms elsewhere. The megaspores accumulated in fluvial floodplain facies and are associated with mostly dissociated isoetalean leaf debris. Other mesofossils in the sampled interval include annelid egg cases, dispersed seeds and charcoal. Invertebrate burrows and possible vertebrate tracks also occur in this succession. Lycophyte macrofossils are otherwise known from only two other Australian Jurassic deposits. The richness of the megaspore and microspore suites attest to a significant diversity of lycophytes in the Australian Jurassic floras not hitherto appreciated from described macrofloras.Keywords: lycophyte megaspores, Isoetales, mesofossils, microspores, Pliensbachian, Clarence-Moreton Basin, GondwanaThe Hettangian-basal Toarcian interval is bracketed by two globally recognised mass extinction events. In the Gondwanan terrestrial realm, the RhaetianHettangian transition is marked by the collapse of the Dicroidium/Falcisporites flora that had dominated most of the Triassic (Anderson et al., 1999). In its place arose a flora rich in Bennettitales, Caytoniales and cheirolepidiacean conifers (Gould, 1975;Hill et al., 1999). A further transition in the Toarcian saw a decline in cheirolepids and increases in araucariacean and podocarpacean conifers and pentoxylalean gymnosperms in Australia (Turner et al., 2009). The Australian Hettangian-Toarcian floras remain poorly understood, being represented by only a few macrofloral assemblages from central eastern Australia that have yet to be fully described (Jones & de Jersey, 1947;Gould, 1968Gould, , 1974Gould, , 1975Pattemore, 2000;Pattemore & Rigby, 2005;Jansson et al., 2008b). Palynofloras provide a broader picture of Australia's Early Jurassic floristic succession (Evans, 1966;de Jersey, 1975;Filatoff, 1975;Burger, 1976Burger, , 1994Helby et al., 1987;Turner et al., 2009), but the biological affinities of some palynomorphs remain poorly resolved (Balme, 1995) and spore-pollen assemblages may be subject to significant taphonomic sorting (Holmes, 1994). Mesofossils (0.2-5.0 mm remains including megaspores, sporangia, seeds and charcoalfied plant fragments) represent an additional avenue for evaluating fossil plant diversity. However, mesofossil suites have been largely neglected in past palaeobotani...

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PAXILLITRILETES, A NEW NAME FOR FOSSIL MEGASPORES HITHERTO INVALIDLY NAMED TOMSONIA

Cited by 29 publications

References 2 publications

An unusual megaspore of uncertain systematic affinity from Lower Cretaceous deposits in south-east England and its biostratigraphic and palaeoenvironmental significance

An unusual megaspore of uncertain systematic affinity from Lower Cretaceous deposits in south-east England and its biostratigraphic and palaeoenvironmental significance

A new isoetalean microsporophyll from the latest Albian of northeastern Spain: Diversity in the development and dispersal strategies of microspores

Megaspore and microfossil assemblages reveal diverse herbaceous lycophytes in the Australian Early Jurassic flora

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