The generic name, Fallotaspis, is a compound crassis word that honors Paul Fallot (1889-1960), a French paleontologist who researched Cambrian fossils in Spain, in combination with the Greek word ἀσπίς, aspis, meaning shield.[3]
Description
Restoration of F. bondoni
As with most early trilobites, Fallotaspis has an almost flat exoskeleton, that is only thinly calcified, and has crescent-shaped eye ridges. As part of the Olenellina suborder, Fallotaspis lacks dorsal sutures. As part of the superfamily Fallotaspidoidea Fallotaspis can be distinguished from Olenelloidea, Judomioidea and Nevadioidea by features of the cephalon and in particular the glabella. The glabella tapers forward. The frontal lobe of the glabella (because it is counted from the back, it is numbered L4) is as long as the most backward lobe (L0), less than in these other Olenellina subfamilies. The eye ridges (or ocular lobes) contact, but do not merge with, the entire frontal margin of the glabella.[4] The cephalon of Fallotaspis is semi-circular in shape, with rounded cheeks that are continuous with long spines that go back to the first half of the thorax. Sutures absent. The thorax has up to 21 segments. The third segment terminating in a long spine that extends back to the fourteenth segment. The tail shield (or pygidium) is very small, about the same length as the two most backward thorax segments combined.
Key to the species
This key is based on the analysis of Lieberman.[1] This key only includes the two Fallotaspis species that Lieberman included in his analysis, where the literature suggests there may be at least ten species. It complements the key in the Fallotaspidoidea article.
1
The ridge bordering the head shield (or anterior border) in front of the sides of the glabella is approximately 1½× as wide as the most backward lobe of the glabella (occipital ring or L0). → Fallotaspis typica
-
The anterior border is at most 1¼× as wide as L0. → Fallotaspis bondoni
Sources
Photo of F. longa
Photo of F. sp.
References
^ abLieberman, B.S. (2002). (PDF). Journal of Paleontology. 76 (4): 692–708. doi:10.1666/0022-3360(2002)076<0692:paosbe>2.0.co;2. Archived from the original (PDF) on 2011-08-12. Retrieved 2012-09-17.
^Gerd Geyer (2019). "The earliest known West Gondwanan trilobites from the Anti‐Atlas of Morocco, with a revision of the family Bigotinidae Hupe, 1953". Fossils and Strata. 64: 55–154. doi:10.1002/9781119564249.ch6. ISBN978-1-119-56423-2. S2CID 146691606.
^Brasier, M. (2009). Darwin's Lost World - The hidden history of animal life. UK: Oxford University Press. p. 45. ISBN9780191613906.
^Lieberman, B. S. (1998). "Cladistic analysis of the Early Cambrian olenelloid trilobites". Journal of Paleontology. 72: 59–78. doi:10.1017/S0022336000024021.
fallotaspis, genus, redlichiid, trilobites, found, early, cambrian, aged, strata, united, states, morocco, temporal, range, lower, cambrian, lower, atdabanian, preꞒ, longa, white, mountain, courtesy, iiiscientific, classificationkingdom, animaliaphylum, arthro. Fallotaspis is a genus of redlichiid trilobites found in Early Cambrian aged strata of the United States and Morocco FallotaspisTemporal range Lower Cambrian Lower Atdabanian PreꞒ Ꞓ O S D C P T J K Pg N Fallotaspis longa White Mountain courtesy Sam Gon IIIScientific classificationKingdom AnimaliaPhylum ArthropodaClass TrilobitaOrder RedlichiidaSuborder OlenellinaSuperfamily FallotaspidoideaFamily FallotaspididaeGenus FallotaspisHupe 1953 1 SpeciesF typica Hupe 1953 Type F antecedens Geyer 2019 2 F bondoni Neltner amp Poctey 1949 synonym Olenellus bondoni F inexspectatus Geyer 1996 F ljugneri Kautsky 1945 F longa Hupe 1953 F longispina Hupe 1953 F mongolicus Korobov 1980 F plana Hupe 1953 F planospinosa Hupe 1953 F tazemmourtensis Hupe 1953 Contents 1 Etymology 2 Description 3 Key to the species 4 Sources 5 ReferencesEtymology EditThe generic name Fallotaspis is a compound crassis word that honors Paul Fallot 1889 1960 a French paleontologist who researched Cambrian fossils in Spain in combination with the Greek word ἀspis aspis meaning shield 3 Description Edit Restoration of F bondoni As with most early trilobites Fallotaspis has an almost flat exoskeleton that is only thinly calcified and has crescent shaped eye ridges As part of the Olenellina suborder Fallotaspis lacks dorsal sutures As part of the superfamily Fallotaspidoidea Fallotaspis can be distinguished from Olenelloidea Judomioidea and Nevadioidea by features of the cephalon and in particular the glabella The glabella tapers forward The frontal lobe of the glabella because it is counted from the back it is numbered L4 is as long as the most backward lobe L0 less than in these other Olenellina subfamilies The eye ridges or ocular lobes contact but do not merge with the entire frontal margin of the glabella 4 The cephalon of Fallotaspis is semi circular in shape with rounded cheeks that are continuous with long spines that go back to the first half of the thorax Sutures absent The thorax has up to 21 segments The third segment terminating in a long spine that extends back to the fourteenth segment The tail shield or pygidium is very small about the same length as the two most backward thorax segments combined Key to the species EditThis key is based on the analysis of Lieberman 1 This key only includes the two Fallotaspis species that Lieberman included in his analysis where the literature suggests there may be at least ten species It complements the key in the Fallotaspidoidea article 1 The ridge bordering the head shield or anterior border in front of the sides of the glabella is approximately 1 as wide as the most backward lobe of the glabella occipital ring or L0 Fallotaspis typica The anterior border is at most 1 as wide as L0 Fallotaspis bondoniSources EditPhoto of F longa Photo of F sp White Mtn research stationReferences Edit a b Lieberman B S 2002 Phylogenetic analysis of some basal early Cambrian Trilobites the biogeographic origins of the Eutrilobites and the timing of the Cambrian radiation PDF Journal of Paleontology 76 4 692 708 doi 10 1666 0022 3360 2002 076 lt 0692 paosbe gt 2 0 co 2 Archived from the original PDF on 2011 08 12 Retrieved 2012 09 17 Gerd Geyer 2019 The earliest known West Gondwanan trilobites from the Anti Atlas of Morocco with a revision of the family Bigotinidae Hupe 1953 Fossils and Strata 64 55 154 doi 10 1002 9781119564249 ch6 ISBN 978 1 119 56423 2 S2CID 146691606 Brasier M 2009 Darwin s Lost World The hidden history of animal life UK Oxford University Press p 45 ISBN 9780191613906 Lieberman B S 1998 Cladistic analysis of the Early Cambrian olenelloid trilobites Journal of Paleontology 72 59 78 doi 10 1017 S0022336000024021 Paleontology portal Retrieved from https en wikipedia org w index php title Fallotaspis amp oldid 1129433134, wikipedia, wiki, book, books, library,
