IV.—Notes on the genus Homalonotus

Reed, F. R. Cowper

doi:10.1017/s0016756800194828

Cited by 14 publications

(3 citation statements)

References 5 publications

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“…It should be mentioned that Mucronaspis in the East Baltic, as well as in other regions, is associated with the homalonotid trilobite genus Brongniartella Reed, 1918, which occurs in different stratigraphical levels.…”

Section: Morph B (Cephalon Git 585-6-1 Figs 3b 5m-o)mentioning

confidence: 99%

Hirnantia sagittifera(Brachiopoda) andMucronaspis mucronatas.l. (Trilobita) in the Upper Ordovician of the East Baltic: taxonomy and distribution

Hints¹,

Pärnaste²,

Gailite†³

2012

Estonian J. Earth Sci.

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The brachiopod Hirnantia sagittifera (M'Coy) and trilobite morphs of the genus Mucronaspis from the topmost Ordovician Porkuni Stage of the central East Baltic are described and compared with those from the Hirnantian Stage of other regions. These important Hirnantian taxa occur in the Livonian Tongue of the Central Baltoscandian Facies Belt of the Baltic Basin, where the Porkuni Stage is represented by the non-graptolitic Kuldiga and Saldus formations. Hirnantia sagittifera appears in the lowermost part of the Porkuni Stage and is rather widely distributed in the basin in spite of its rare finds in each locality. Our study of trilobites of the genus Mucronaspis has enabled us to observe morphological changes in its exoskeleton in time and to identify a succession of five morphotypes (morphs). In some characteristics these morphs are similar to those of different alleged species of the genus Mucronaspis (M. olini, M. danai, M. ganabina, M. mucronata) but they cannot be definitely assigned to any of these species due to some variances. However, here for the first time a stratigraphically ordered collection is presented, which deserves attention in revising the taxonomy of highly variable Mucronaspis. The described brachiopods and trilobites occur mainly in the strata correlated with the Normalograptus extraordinarius graptolite Biozone. However, the uppermost finds of both taxa come from strata correlated with the N. persculptus Biozone.

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Section: Morph B (Cephalon Git 585-6-1 Figs 3b 5m-o)mentioning

confidence: 99%

Hirnantia sagittifera(Brachiopoda) andMucronaspis mucronatas.l. (Trilobita) in the Upper Ordovician of the East Baltic: taxonomy and distribution

Hints¹,

Pärnaste²,

Gailite†³

2012

Estonian J. Earth Sci.

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“…Order PHACOPIDA Salter, 1864 Suborder CALYMENINA Swinnerton, 1915 Superfamily CALYMENOIDEA Burmeister, 1843 Family Woodward (1903, in Reed, 1918 referred to Burmeisteria as a genus. Clarke (1913) attributed the Devonian Brazilian material to Homalonotus.…”

Section: Systematicsmentioning

confidence: 99%

Systematics, taphonomy, and paleoecology of homalonotid trilobites (Phacopida) from the Ponta Grossa Formation

Simões¹,

Leme²,

Soares³

2009

RBP

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Homalonotid trilobites (Phacopida) from the Ponta Grossa Formation (Lower Devonian), Paraná State are revised. A total of 156 specimens recovered from rocks that belong to the Jaguariaíva Member (or Sequence B), of the Ponta Grossa Formation cropping out at Ponta Grossa, Tibagi and Jaguariaíva counties, were examined. Data gathered indicate that at least two species are present (Burmeisteria noticus and B. herscheli). B. noticus is a conspicuous species of the Devonian rocks of South Africa (Bokkeveld Group), Argentina (Lipéon Formation), Bolivia (Icla and Bélen Formations), and Brazil (Pimenteiras and Ponta Grossa formations). B. herscheli is common in Devonian strata on the Falkland Islands (Fox Bay Formation), South Africa (Bokkeveld Group), and Bolivia (Icla and Tarija formations), and is a newly recognized member of the trilobite fauna of the Ponta Grossa Formation. Hence, the homalonotid fauna of the Ponta Grossa Formation is not monospecific, as previously assumed. Finally, homalonotids are not randomly distributed throughout the succession of the Ponta Grossa Formation. B. herscheli shows a more restricted bathymetric distribution, preferentially occurring in sandstones and siltstones deposited just at the storm wave base. B. noticus lived and/or were preserved in sedimentary deposits varying from sandy facies, generated just in and/or above the fair weather wave base, and in muddy facies deposited below storm wave base. Despite the differences in the distribution of both species, homalonotid remains are rather abundant in the shallow water facies, deposited jus at or above storm wave base, being potentially important paleoenvironmental (neritic facies) indicators.

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“…It was assigned to Eohomalonotus cf. sdzuyi Hammann & Henry, 1978, one of the most widespread representa-tives of the genus Eohomalonotus Reed, 1918, which integrates the shallowest trilobite biofacies of the Ordovician of Ibero-Armorica and North Africa (Hammann & Henry, 1978;Henry, 1980a;Hammann, 1983;Rábano, 1989bRábano, , 1989dHenry & Destombes, 1991). Subsequent regional syntheses by Hammann et al (1982, p. 30) and Liñán et al (1996, fig.…”

Section: Phacopid Trilobites: the Calymeninesmentioning

confidence: 99%

Middle Ordovician trilobites from the Castillejo Formation, Eastern Iberian Range (NE Spain): taxonomic reappraisal, biostratigraphy, and correlation

Romero

Gutiérrez-Marco

2023

Spanish J. Palaeontol.

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IV.—Notes on the genus Homalonotus

Cited by 14 publications

References 5 publications

Hirnantia sagittifera(Brachiopoda) andMucronaspis mucronatas.l. (Trilobita) in the Upper Ordovician of the East Baltic: taxonomy and distribution

Hirnantia sagittifera(Brachiopoda) andMucronaspis mucronatas.l. (Trilobita) in the Upper Ordovician of the East Baltic: taxonomy and distribution

Systematics, taphonomy, and paleoecology of homalonotid trilobites (Phacopida) from the Ponta Grossa Formation

Middle Ordovician trilobites from the Castillejo Formation, Eastern Iberian Range (NE Spain): taxonomic reappraisal, biostratigraphy, and correlation

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