Hollardops is a genus of trilobite in the order Phacopida that lived during the Devonian. Their fossils are found in the upper Emsian of western Europe (France, Spain) and in the lower Emsian to lowermost Eifelian of North Africa (Morocco, Algeria). The type species, Asteropyge mesocristata, was described from Algeria by Le Maître in 1952. The genus Hollardops was erected by Morzadec in 1997.[1] In the same year, Lieberman & Kloc[2] erected Modellops and Philipsmithiana but those genera are regarded as subjective synonyms of Hollardops. The 10-segmented thoracic condition of Hollardops is a rare feature among acastid trilobites that almost always have 11 thorax segments. Van Viersen & Kloc (2022)[3] revisited Hollardops and described a number of new species from the Devonian of Morocco. They also regarded Pennarbedops Bignon & Crônier, 2013 as a synonym of Hollardops. Van Viersen & Kloc construed Hollardops as a scavenger or predator with well-developed eyes, that used its shovel-like cephalon to plough the top layers of the sediment in search of food. Hollardops had small pits horizontally along the fringe of the exoskeleton; these are believed to have housed setae that allowed the trilobite to closely monitor its surroundings.
Hollardops have schizochroal eyes and a glabella that is slightly raised on the surface of the cephalon. Genal spines extend from the cephalon and extend to approximately the 6th thoracic segment.
Hollardops has 10 thoracic segments and also has 5 pairs of pleural lappets or spines projecting from the pygidium.
Length ranges from approximately 3 to 9 cm.
Referencesedit
^Morzadec, Pierre (1997-04-29). "Les Trilobites Asteropyginae du Dévonien de l'Ougarta (Algérie)". Palaeontographica Abteilung A (in French). 244 (4–6): 143–158. Bibcode:1997PalAA.244..143M. doi:10.1127/pala/244/1997/143. S2CID 247209941.
^Lieberman, Bruce S.; Kloc, Gerald J. (1997). "Evolutionary and biogeographic patterns in the Asteropyginae (Trilobita, Devonian) Delo, 1935. Bulletin of the AMNH ; no. 232". hdl:2246/1623. {{cite journal}}: Cite journal requires |journal= (help)
^Viersen, Allart P. VAN; J. Kloc, Gerald (2022-12-09). "Functional morphology, coaptation and palaeoecology of Hollardops (Trilobita, Acastidae), with descriptions of new species and two new genera from the Devonian of Morocco". Geologica Belgica. 25 (3–4): 99–144. doi:10.20341/gb.2022.005. ISSN 1374-8505.
hollardops, genus, trilobite, order, phacopida, that, lived, during, devonian, their, fossils, found, upper, emsian, western, europe, france, spain, lower, emsian, lowermost, eifelian, north, africa, morocco, algeria, type, species, asteropyge, mesocristata, d. Hollardops is a genus of trilobite in the order Phacopida that lived during the Devonian Their fossils are found in the upper Emsian of western Europe France Spain and in the lower Emsian to lowermost Eifelian of North Africa Morocco Algeria The type species Asteropyge mesocristata was described from Algeria by Le Maitre in 1952 The genus Hollardops was erected by Morzadec in 1997 1 In the same year Lieberman amp Kloc 2 erected Modellops and Philipsmithiana but those genera are regarded as subjective synonyms of Hollardops The 10 segmented thoracic condition of Hollardops is a rare feature among acastid trilobites that almost always have 11 thorax segments Van Viersen amp Kloc 2022 3 revisited Hollardops and described a number of new species from the Devonian of Morocco They also regarded Pennarbedops Bignon amp Cronier 2013 as a synonym of Hollardops Van Viersen amp Kloc construed Hollardops as a scavenger or predator with well developed eyes that used its shovel like cephalon to plough the top layers of the sediment in search of food Hollardops had small pits horizontally along the fringe of the exoskeleton these are believed to have housed setae that allowed the trilobite to closely monitor its surroundings HollardopsTemporal range Emsian Eifelian PreꞒ Ꞓ O S D C P T J K Pg N Hollardops sp Houston Museum of Natural Science DSC01602 Scientific classification Kingdom Animalia Phylum Arthropoda Class Trilobita Order Phacopida Suborder Phacopina Superfamily Acastoidea Family Acastidae Subfamily Asteropyginae Genus HollardopsMorzadec 1997 Species Asteropyge mesocristata Le Maitre 1952H aithassainorum Chatterton et al 2006H angustifrons Van Viersen amp Kloc 2022Rhenops babini Morzadec 1983Philipsmithiana burtandmimiae Lieberman amp Kloc 1997H boudibensis Morzadec 2001Rhenops circumapodemus Smeenk 1983Philipsmithiana hyfinkeli Lieberman amp Kloc 1997H kyriarchos Van Viersen amp Kloc 2022H klugi Van Viersen amp Kloc 2022H luscus Van Viersen amp Kloc 2022H multatuli Van Viersen amp Kloc 2022Greenops struvei Morzadec 1969Description edit nbsp Hollardops sp Houston Museum of Nat Sci DSC01611Both specimen are from Tazoulait Formation atJbel Jebel Oufatene 30 50 15 N 4 54 07 W 30 8374368 N 4 9018067 W 30 8374368 4 9018067 Jbel Oufatene 4 and Issimour 30 58 01 N 5 02 14 W 30 9669834 N 5 0373266 W 30 9669834 5 0373266 Jbel Issimour 5 SE of Alnif western of Oued Alnif Ma ider region Morocco Hollardops have schizochroal eyes and a glabella that is slightly raised on the surface of the cephalon Genal spines extend from the cephalon and extend to approximately the 6th thoracic segment Hollardops has 10 thoracic segments and also has 5 pairs of pleural lappets or spines projecting from the pygidium Length ranges from approximately 3 to 9 cm References edit Morzadec Pierre 1997 04 29 Les Trilobites Asteropyginae du Devonien de l Ougarta Algerie Palaeontographica Abteilung A in French 244 4 6 143 158 Bibcode 1997PalAA 244 143M doi 10 1127 pala 244 1997 143 S2CID 247209941 Lieberman Bruce S Kloc Gerald J 1997 Evolutionary and biogeographic patterns in the Asteropyginae Trilobita Devonian Delo 1935 Bulletin of the AMNH no 232 hdl 2246 1623 a href Template Cite journal html title Template Cite journal cite journal a Cite journal requires journal help Viersen Allart P VAN J Kloc Gerald 2022 12 09 Functional morphology coaptation and palaeoecology of Hollardops Trilobita Acastidae with descriptions of new species and two new genera from the Devonian of Morocco Geologica Belgica 25 3 4 99 144 doi 10 20341 gb 2022 005 ISSN 1374 8505 Google Maps Jebel Oufatene Google Maps Jebel Issimour nbsp This Phacopida related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Hollardops amp oldid 1186447029, wikipedia, wiki, book, books, library,
