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![1. Ambitisporites avitus Hoffmeister 1959. FE10, (A) Q13, 2. Ambitisporites avitus Hoffmeister 1959. FE10, (A) Q13, 3. Ambitisporites dilutus (Hoffmeister) Richardson & Lister 1969. F11, (G) E33, 4. Ambitisporites dilutus (Hoffmeister) Richardson & Lister 1969. F11, (A) D27, 5. Ambitisporites capitaneus Beck & Strother 2001. FE8, (A) P25, 6. Ambitisporites cf. elsae (Cramer and Diez) Richardson et al. 2001. FE11, (G) O19, 7. Apiculiretusispora plicata (Allen) Streel 1967 FE8, (A) R17, 8. Apiculiretusispora plicata (Allen) Streel 1967. FE11, (G) R29, 9. Apiculiretusispora synorea Richardson & Lister 1996. FE8, (A) M38, 10. Apiculiretusispora synorea Richardson & Lister 1996. FE8, (A) S41, 11. Apiculiretusispora spicula Richardson & Lister 1996. FE8, (A) X43, 12. Apiculiretusispora spicula Richardson & Lister 1996. FE8, (A) D4, 13. Archaeozonotriletes chulus var. chulus Richardson & Lister 1969. FE8, (A) M30, 14. Archaeozonotriletes chulus var. nanus Richardson & Lister 1969. FE10, (A) M15, 15. Breconisporites sp. A. FE5, (B) F39, 16. Cymbosporites echinatus Richardson & Lister 1969. FE11, (A) L27, 17. Cymbosporites echinatus Richardson & Lister 1969. FE11, (A) W37, 18. Cymbosporites sp. A. FE11, (G) P12, 19. Insolatisporites sp. A. FE10, (A) O20, 20. Concentricosiporites sagittarius (Rodriguez) Rodriguez 1983. FE8, (A) O22.]()
![Figure 6.]()
![Palynomorphs from bed-10 at section PM90. (1) Gulisporites intropunctatus Lu, 1981; (2) Gulisporites sp. 1; (3) Gulisporites hiatus Lu, 1997; (4) Apiculiretusispora sp. 1; (5) Aneurospora sp.; (6) Lophotriletes sp.; (7) Apiculiretusispora sp. 2; (8) Densosporites sp.; (9) Acritarch; (10) Dibolisporites sp.; (11, 23) indeterminable spores; (12) Cymbosporites cyathus Allen, 1965; (13) Cymbosporites conatus Bharadwaj et al., 1971; (14) Gulisporites sp. 2; (15) Lycospora sp.; (16) Retusotriletes sp.; (17, 18) Ambitisporites sp.; (19) Ambitisporites dilutes (Hoffmeister) Richardson and Lister, 1969; (20, 22) Reticulatisporites sp.; (21) Apiculiretusispora sp. 3.]()
![All palynomorphs are identified by their measured section number (see Text-Fig. 2) and age. In parentheses are the Nova Scotia Museum of Natural History catalogue number, slide sample number (see Table 3 for abbreviations), microscope stage coordinates, and England finder location. All photomicrographs are at the same scale (see 10 micrometer bar in figure 1), except for the SEM photographs which have their own 10 μm scale.
1–8 Ambitisporites avitus Hoffmeister 1959.
1 MS 3, Aeronian(?) (NSM.999GF16.1, mr486b, 101.4x7.9, Q39\4).
2 MS 3, Aeronian(?) (NSM.999GF16.2, mr486b, 106.2x4.4, U44).
3 MS 3, Aeronian(?) (NSM.999GF16.3, mr486b, 112.4x5.9, S50\4 -T51\1).
4 MS 5, Telychian (NSM.999GF16.4, ur436b, 98.4x9.6, P36\2).
5 MS 5, Telychian (NSM.999GF16.5, ur436a, 102.9x9.3, P41).
6 MS 5, Telychian (NSM.999GF16.6, ur436b, 109.6x17.2, G48\1).
7 MS 6, Telychian (NSM.999GF16.7, ur373b, 99x2.8, V37\3-4)
8 MS 6, Telychian (NSM.999GF16.8, ur373b, 97x12.6, L35\3).
9–11 Tetrahedraletes medinensis Strother & Traverseemend. Wellman & Richardson 1993.
9 MS 6, Telychian (NSM.999GF16.9, ur373b, 93.4x0, Y31\4).
10 MS 6, Telychian (NSM.999GF16.10, ur373b, 105.6x17.8, F44\1).
11 MS 6, Telychian (NSM.999GF16.11, ur373b, 94.5x18.2, F32\2).
12, 13 Ambitisporites avitus Hoffmeister 1959.
12 MS 7, Sheinwoodian (NSM.999GF16.12, fr389a, 89.9x4.1, U28\3).
13 MS 13, Gorstian (NSM.999GF16.13, umb432a, 100.1x11, N38).
14 Ambitisporites dilutus (Hoffmeister) Richardson & Lister 1969, MS 14, Gorstian–Ludfordian (NSM.999GF16.14, umb313b, 101.7x13.3, L40\1).
15 Ambitisporites avitus Hoffmeister 1959, MS 14, Gorstian–Ludfordian (NSM.999GF16.15, umb467a, 98.1x9.8, P36\1).
16–18 Ambitisporites marginatus sp. nov.
16 MS 14, Gorstian–early Ludfordian (NSM.999GF16.16, umb313b, 114.5x11.9, M53-M53\3).
17 Holotype, MS 14, Gorstian–early Ludfordian (NSM.999GF16.17, umb313b, 96.5x6.3, S34).
18 MS 14, Gorstian–early Ludfordian (NSM.999 GF16.18, umb313b, 104.4x11.5, N42\2).]()
![All illustrated specimens are housed in the Department of Geology Museum collection, Trinity College Dublin. The figure number is followed by the specimen number, sample data, and PDI. Figure 1. Large specimen of Tasmanites sp. showing areas selected by 10 independent operators as typical of the overall palynomorph colour. The 10 results are shown in Table 4 and Figure 4. Figures 2–7. Examples of Lower Palaeozoic palynomorphs investigated, all at same scale. Figure 2. Tasmanites sp. PET_7, Well RH- 3, core # 3, 1,323.9 – 1,330.2 m, Mudawara Formation (Silurian) Jordan. Figure 3. Tasmanites sp. PET_3, Well RH-3, core # 3, 1,323.9 – 1,330.2 m, Mudawara Formation (Silurian) Jordan. Figure 4. Tasmanites sp. PET_8, Well RH-3, core # 3, 1,323.9 – 1,330.2 m, Mudawara Formation (Silurian) Jordan. Figure 5. Ambitisporites sp. PET_22, Well RH-4, Core # 1, 443.42 – 448.15 m, KishSha Formation (Silurian). Figure 6. Ambitisporites sp. PET_14, Well RH-4, Core # 1, 443.42 – 448.15 m, KishSha Formation (Silurian). Figure 7. Ambitisporites sp. PET_15, Well RH-4, Core # 1, 443.42 – 448.15 m, KishSha Formation (Silurian).]()
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![Correlation of calculated PDI values from RGB measurements of unoxidised Palaeozoic prasinophytes (Tasmanites) and trilete miospores (Ambitisporites) on two different microscope/camera combinations is shown. Leitz v. Nikon 1 showing a linear correlation where R2 = 0.96.]()
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![Dispersed spores (a–l), plant megafossil (m) and phytodebris (n, o) from the Stonehaven Group. Palynomorphs are located by slide number followed by England Finder number (in parentheses following each fossil identification). Scale bar represents 30 μm (a–l), 1.8 mm (m) or 40 μm (n, o). (a) Tetrahedraletes medinensis (Strother and Traverse) Wellman and Richardson (1993) (21SCOT13.2, J46). (b) Dyadospora murusdensa (Strother and Traverse) Burgess and Richardson (1991) (21SCOT13.2, E46). (c) Laevolancis divellomedium (Chibrikova) Burgess and Richardson (1991) (21SCOT13.R, W32). (d) Cheilotetras caledonica Wellman and Richardson (1993) (21SCOT13.1, G47/3). (e) Pseudodyadospora petasus Wellman and Richardson (1993) (21SCOT13.1, V44). (f) Hilate cryptospore with reticulate ornament. Pyrite damage has enhanced the reticulation but its original form is evident (21SCOT13.2, H42). (g) Hispanaediscus wenlockensis Burgess and Richardson (1991) (21SCOT13.1, H42/3). (h) Hispanaediscus wenlockensis Burgess and Richardson (1991) (21SCOT13.1, H44/3). (i) Hispanaediscus lamontii Wellman (1993) (21SCOT13.R, S42/3). (j) Hispanaediscus lamontii Wellman (1993) (21SCOT13.1, U42/1). (k) Ambitisporites dilutus (Hoffmeister) Richardson and Lister (1969) (21SCOT13.2, N38). (l) Ambitisporites avitus Hoffmeister (1959) (21SCOT13.1, O43/1). (m) Plant megafossil represented by a simple bifurcating axes. (n) Banded tube (21SCOT13.1, P44/4). (o) Cuticle-like sheet (21SCOT13.1, M32).]()
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![Figure8—SEM micrographs of spores and cryptospores from the Silurian Allenport section, central Pennsylvania, USA. Each micrograph has its own 10 μm scale bar. 1,Retusotriletes abundoRodriquez, 1978a, Bloomsburg, sample bsk97-54; 2,Ambitisporites avitusHoffmeister, 1959, Bloomsburg, sample bsk97-54; 3,Scylaspora scriptaBurgess and Richardson, 1995, Bloomsburg, sample bsk97-54; 4, possible Vermiverruspora sp. cf. V. rumneyi (Burgess and Richardson) Beck and Strother, 2001, Bloomsburg, sample bsk97-54; 5,Artemopyra brevicostaBurgess and Richardson, 1991, Bloomsburg, sample bsk97-54; 6,Rugosphaera falloambita n. sp., Wills Creek, sample bsk97-67; 7,Tetrahedraletes medinensis Strother and Traverse emend. Wellman and Richardson, 1993, Bloomsburg, sample bsk97-54; 8,Laevolancis divellomedia (Chibrickova) Burgess and Richardson, 1991, Bloomsburg, sample bsk97-54; 9,Hispanaediscus sp. cf. H. lamontiiWellman, 1993, Bloomsburg, sample bsk97-54; 10,Rimosotetras sp., Bloomsburg, sample bsk97-54; 11,Rugosphaera falloambita n. sp., Wills Creek, sample bsk97-67; 12,Quadrisporites sp., Bloomsburg, sample bsk97-54; 13,Rugosphaera falloambita n. sp., Wills Creek, sample bsk97-67; 14,Ambitisporites avitusHoffmeister, 1959, Bloomsburg, sample bsk97-54]()
![1 Chelinohilates lornensisWellman & Richardson 1996, proximal focus. 97120, 1/2 unox, P38-3.
2 C. lornensis, distal focus. 97120, 1/2 unox, P38-3.
3 Hispanaediscus verrucatus Cramer emend. Burgess & Richardson 1991. 97120, 1/2 unox, N17-3.
4 H. verrucatus. 97120, 1/2 unox, P41-4.
5 Retusotriletes warringtoniiRichardson & Lister 1969. 97120, 1/2 unox, M44-2.
6 R. warringtonii. 97120, 1/2 unox, Q19-2.
7 cf. Retusotriletes rotundus (Streel) Lele & Streel 1969. 97123, 1/2 unox, R41-4.
8 cf. R. rotundus. 93286, ox, M27-3.
9 cf. Emphanisporites micrornatusRichardson & Lister 1969, proximal focus. 97120, 1/2 unox, M33-2.
10 cf. E. micrornatus, distal focus. 97120, 1/2 unox, M33-2.
11 Emphanisporites rotatus McGregor 1961. 93286, 2/2 ox, F31-2.
12 Emphanisporites splendens (Richardson & Ioannides) Richardson & Ioannides 1979. 97120, 1/2 unox, Q41-3.
13 Ambitisporites avitusHoffmeister 1959. 93286, ox, S18-2.
14 Ambitisporites dilutus (Hoffmeister) Richardson & Lister 1969. 97120, 1/2 unox, P26-0.]()
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Ambitisporites
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1
Image
1. Ambitisporites avitus Hoffmeister 1959 . FE10, (A) Q13, 2. Ambitispo... Available to Purchase
in Palynology of the Freshwater East Formation (Upper Silurian, Pridoli), Pembrokeshire, South Wales, UK
> Palynology
Published: 02 October 2022
Plate 2. 1. Ambitisporites avitus Hoffmeister 1959 . FE10, (A) Q13, 2. Ambitisporites avitus Hoffmeister 1959 . FE10, (A) Q13, 3. Ambitisporites dilutus (Hoffmeister) Richardson & Lister 1969 . F11, (G) E33, 4. Ambitisporites dilutus (Hoffmeister) Richardson & Lister 1969
Image
(a) Ambitisporites avitus/dilutus sensu Steemans, Le Hérissé ... Available to Purchase
in Upper Silurian miospores from the Precordillera Basin, Argentina: biostratigraphic, palaeonvironmental and palaeogeographic implications
> Geological Magazine
Published: 02 August 2013
Figure 6. (a) Ambitisporites avitus/dilutus sensu Steemans, Le Hérissé
& Bozdogan, 1996 , slide 60659,
K45/3. (b) Amicosporites ? sp., slide 60986, M45/0. (c) Amicosporites streelii Steemans, 1989 , slide 60984, S29/1. (d) Apiculiretusispora sp
Image
Palynomorphs from bed-10 at section PM90. ( 1 ) Gulisporites intropunctatu... Available to Purchase
in A new Late Devonian flora from Sonid Zuoqi, Inner Mongolia, northeastern China
> Journal of Paleontology
Published: 01 March 2022
) Ambitisporites sp.; ( 19 ) Ambitisporites dilutes (Hoffmeister) Richardson and Lister, 1969 ; ( 20 , 22 ) Reticulatisporites sp.; ( 21 ) Apiculiretusispora sp. 3.
Image
All palynomorphs are identified by their measured section number (see Text-... Available to Purchase
Published: 01 January 2001
photomicrographs are at the same scale (see 10 micrometer bar in figure 1), except for the SEM photographs which have their own 10 μm scale.
1–8 Ambitisporites avitus Hoffmeister 1959.
1 MS 3, Aeronian(?) (NSM.999GF16.1, mr486b, 101.4x7.9, Q39\4).
2 MS 3, Aeronian(?) (NSM.999GF16.2, mr486b, 106.2x4.4, U44
Image
All illustrated specimens are housed in the Department of Geology Museum co... Available to Purchase
Published: 01 December 2010
. Tasmanites sp. PET_3, Well RH-3, core # 3, 1,323.9 – 1,330.2 m, Mudawara Formation (Silurian) Jordan. Figure 4. Tasmanites sp. PET_8, Well RH-3, core # 3, 1,323.9 – 1,330.2 m, Mudawara Formation (Silurian) Jordan. Figure 5. Ambitisporites sp. PET_22, Well RH-4, Core # 1, 443.42 – 448.15 m, KishSha
Journal Article
A diverse Early Devonian palynoflora from the Waxweiler Lagerstätte (Klerf Formation, Rhenish Massif, Western Germany): palaeobotanical implications Available to Purchase
Journal: Palynology
Publisher: AASP -The Palynological Society
Published: 28 April 2023
Palynology (2023) 47 (2): 2150904.
... of classic Lower Devonian taxa of the Old Red Continent (Laurussia). These belong, among others, to the genera Ambitisporites , Apiculiretusispora and Retusotriletes . Biostratigraphically more important species recovered include Acinosporites lindlarensis , Apiculiretusispora brandtii , Cymbosporites...
FIGURES
Image
Correlation of calculated PDI values from RGB measurements of unoxidised Pa... Available to Purchase
Published: 01 December 2010
Figure 2. Correlation of calculated PDI values from RGB measurements of unoxidised Palaeozoic prasinophytes ( Tasmanites ) and trilete miospores ( Ambitisporites ) on two different microscope/camera combinations is shown. Leitz v. Nikon 1 showing a linear correlation where R 2 = 0.96.
Journal Article
Latest Ordovician (Hirnantian) miospores from the Nl-2 well, Algeria, North Africa, and their evolutionary significance Available to Purchase
Journal: Palynology
Publisher: AASP -The Palynological Society
Published: 01 July 2015
Palynology (2015) 39 (2): 205–219.
... levels ( Table 1 ). Table 1 Cryptospore and trilete spore occurrences in the Nl-2 borehole. Ambitisporites sp. ? Dyadospora sp. Gneudnaspora divellomedia var. minor Pseudodyadospora laevigata Tetrahedraletes medinensis Tetrahedraletes grayae Velatitetras rugosa...
FIGURES
Journal Article
Palynomorph Darkness Index (PDI) – a new technique for assessing thermal maturity Available to Purchase
Journal: Palynology
Publisher: AASP -The Palynological Society
Published: 01 December 2010
Palynology (2010) 34 (2): 147–156.
.... Tasmanites sp. PET_3, Well RH-3, core # 3, 1,323.9 – 1,330.2 m, Mudawara Formation (Silurian) Jordan. Figure 4. Tasmanites sp. PET_8, Well RH-3, core # 3, 1,323.9 – 1,330.2 m, Mudawara Formation (Silurian) Jordan. Figure 5. Ambitisporites sp. PET_22, Well RH-4, Core # 1, 443.42 – 448.15 m, KishSha...
FIGURES
Journal Article
Llandovery miospore biostratigraphy and stratigraphic evolution of the Paraná Basin, Paraguay – Palaeogeographic implications Available to Purchase
Publisher: Société Géologique de France
Published: 01 September 2002
Bulletin de la Société Géologique de France (2002) 173 (5): 407–414.
... assemblages are typical of the Llandovery. The presence of Laevolancis divellomedia and the successive first occurrence of the trilete spore genus Ambitisporites, followed by Archaeozonotriletes , allow the recognition of three biozones: divellomedia I, divellomedia II and chulusnanus . Correlations between...
Journal Article
PALYNOLOGY AND MICROPALEONTOLOGY OF THE CLAM BANK FORMATION (LOWER DEVONIAN) OF WESTERN NEWFOUNDLAND, CANADA Available to Purchase
Journal: Palynology
Publisher: AASP -The Palynological Society
Published: 01 January 2002
Palynology (2002) 26 (1): 185–215.
... Cymbohilates, Acontotetras, Hispanaediscus, Laevolancis, and Tetrahedraletes, spore genera Ambitisporites , Aneurospora , Apiculiretusispora , Emphanisporites , Retusotriletes , Synorisporites , Vermiverruspora , and a new species Stellatispora fahraeusi . Acritarchs include the taxon Triangulina sanpetrensis...
FIGURES
Journal Article
SILURIAN SPORES AND CRYPTOSPORES FROM THE ARISAIG GROUP, NOVA SCOTIA, CANADA Available to Purchase
Journal: Palynology
Publisher: AASP -The Palynological Society
Published: 01 January 2001
Palynology (2001) 25 (1): 127–177.
... photomicrographs are at the same scale (see 10 micrometer bar in figure 1), except for the SEM photographs which have their own 10 μm scale.
1–8 Ambitisporites avitus Hoffmeister 1959.
1 MS 3, Aeronian(?) (NSM.999GF16.1, mr486b, 101.4x7.9, Q39\4).
2 MS 3, Aeronian(?) (NSM.999GF16.2, mr486b, 106.2x4.4, U44...
FIGURES
Journal Article
Lower Silurian plant spores from Libya Available to Purchase
Journal: Micropaleontology
Publisher: Micropaleontology Press
Published: 01 July 1959
Micropaleontology (1959) 5 (3): 331–334.
...William S. Hoffmeister Abstract Describes Ambitisporites avitus n.g. n.sp. and Punctatisporites? dilutus n.sp., found in association with upper lower Silurian graptolites in a well core. GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index...
Image
Dispersed spores ( a – l ), plant megafossil ( m ) and phytodebris ( n , o... Open Access
in Age of the basal ‘Lower Old Red Sandstone’ Stonehaven Group of Scotland: the oldest reported air-breathing land animal is Silurian (late Wenlock) in age
> Journal of the Geological Society
Published: 15 December 2023
) Hispanaediscus lamontii Wellman (1993) (21SCOT13.1, U42/1). ( k ) Ambitisporites dilutus (Hoffmeister) Richardson and Lister (1969) (21SCOT13.2, N38). ( l ) Ambitisporites avitus Hoffmeister (1959) (21SCOT13.1, O43/1). ( m ) Plant megafossil represented by a simple bifurcating axes. ( n ) Banded tube
Journal Article
Miospores and Cryptospores from the Silurian Section at Allenport, Pennsylvania, USA Available to Purchase
Journal: Journal of Paleontology
Publisher: Paleontological Society
Published: 01 September 2008
Journal of Paleontology (2008) 82 (5): 857–883.
... distribution through the same interval as now seen in western Avalon ( Beck and Strother, 2001 ) and in the Allenport section. Hagstrom (1997) described a sequence of Wenlock-Ludlow cryptospores and trilete spores from Gotland in Sweden. He found only Ambitisporites dilutus in the Sheinwoodian...
FIGURES
Image
Figure 8 —SEM micrographs of spores and cryptospores from the Silurian All... Available to Purchase
in Miospores and Cryptospores from the Silurian Section at Allenport, Pennsylvania, USA
> Journal of Paleontology
Published: 01 September 2008
Figure 8 —SEM micrographs of spores and cryptospores from the Silurian Allenport section, central Pennsylvania, USA. Each micrograph has its own 10 μm scale bar. 1, Retusotriletes abundo Rodriquez, 1978a , Bloomsburg, sample bsk97-54; 2, Ambitisporites avitus Hoffmeister, 1959 , Bloomsburg
Image
1 Chelinohilates lornensis Wellman & Richardson 1996 , proximal focus... Available to Purchase
in PALYNOLOGY AND MICROPALEONTOLOGY OF THE CLAM BANK FORMATION (LOWER DEVONIAN) OF WESTERN NEWFOUNDLAND, CANADA
> Palynology
Published: 01 January 2002
& Ioannides 1979 . 97120, 1/2 unox, Q41-3.
13 Ambitisporites avitus Hoffmeister 1959 . 93286, ox, S18-2.
14 Ambitisporites dilutus (Hoffmeister) Richardson & Lister 1969 . 97120, 1/2 unox, P26-0.
Journal Article
Palynology of the Freshwater East Formation (Upper Silurian, Pridoli), Pembrokeshire, South Wales, UK Available to Purchase
Journal: Palynology
Publisher: AASP -The Palynological Society
Published: 02 October 2022
Palynology (2022) 46 (4): 1–23.
...Plate 2. 1. Ambitisporites avitus Hoffmeister 1959 . FE10, (A) Q13, 2. Ambitisporites avitus Hoffmeister 1959 . FE10, (A) Q13, 3. Ambitisporites dilutus (Hoffmeister) Richardson & Lister 1969 . F11, (G) E33, 4. Ambitisporites dilutus (Hoffmeister) Richardson & Lister 1969...
FIGURES
Journal Article
Age of the basal ‘Lower Old Red Sandstone’ Stonehaven Group of Scotland: the oldest reported air-breathing land animal is Silurian (late Wenlock) in age Open Access
Journal: Journal of the Geological Society
Publisher: Geological Society of London
Published: 15 December 2023
Journal of the Geological Society (2024) 181 (1): jgs2023-138.
... ) Hispanaediscus lamontii Wellman (1993) (21SCOT13.1, U42/1). ( k ) Ambitisporites dilutus (Hoffmeister) Richardson and Lister (1969) (21SCOT13.2, N38). ( l ) Ambitisporites avitus Hoffmeister (1959) (21SCOT13.1, O43/1). ( m ) Plant megafossil represented by a simple bifurcating axes. ( n ) Banded tube...
FIGURES
Journal Article
Stratigraphy and Operational Palynology of the Devonian System in Saudi Arabia Open Access
Journal: GeoArabia
Publisher: Gulf Petrolink
Published: 01 January 1999
GeoArabia (1999) 4 (1): 53–68.
... Emsian when assemblages of small, simply-structured and sculptured trilete miospores (e.g. Ambitisporites Hoffmeister 1959; Emphanisporites McGregor 1961) diversified to include zonate, cavate, and complexly-ornamented genera such as Samarisporites Richardson 1965, Grandispora Hoffmeister...
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