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The timeline of therizinosaur research is a chronological listing of events in the history of paleontology focused on therizinosaurs. They were unusually long-necked, pot-bellied, and large-clawed herbivorous theropods most closely related to birds. The early history of therizinosaur research occurred in three phases. The first phase was the discovery of scanty and puzzling fossils in Asia by the Central Asiatic Expeditions of the 1920s and Soviet-backed research in the 1950s. This phase resulted in the discovery of the Therizinosaurus cheloniformis type specimen. Soviet paleontologist Evgeny Maleev interpreted these unusual remains as belonging to some kind of gigantic turtle.

The second major phase of therizinosaur research followed the discovery of better preserved remains in the 1970s by collaborative research between the Soviets and Mongolians. These finds revealed the true nature of therizinosaurs as bizarre dinosaurs. However, the exact nature and classification of therizinosaurs within Dinosauria was controversial as was their paleobiology. When Rozhdestventsky first reinterpreted therizinosaurs as dinosaurs he argued that they were unusual theropods that may have used their clawed arms to break open termite mounds or collect fruit. Osmolska and Roniewicz also considered therizinosaurs to be theropods.

In 1979, Altangerel Perle named the new species Segnosaurus galbinensis, which although he recognized was an unusual theropod, he did not recognize as a therizinosaur. Consequently, he named the new family Segnosauridae and, in 1980, Segnosauria. Two years later, Perle recognized commonalities between Therizinosaurus and segnosaurs, reclassifying the former as a member of the latter. From hereout therizinosaur research was considered "segnosaur" research. Perle himself thought that his "segnosaurs" were semi-aquatic fish-eaters. However, in the early 1990s, researchers like Rinchen Barsbold and Teresa Maryańska cast doubt on the connection between therizinosaurs and segnosaurs altogether.

Nevertheless, the description Alxasaurus elsitaiensis provided more evidence for a close relationship between the therizinosaurs and "segnosaurs" and led to a revision of their classification. The discovery of this and other primitive therizinosaurs in China formed the beginnings of the third major wave of therizinosaur research. That same year Russell and Russell reinterpreted therizinosaurs as herbivorous foragers like mammalian chalicotherium. Other significant finds of the 1990s include therizinosaur eggs with embryos preserved inside and the first known therizinosaur with feathers, Beipiaosaurus, which was described from China in 1999.

20th century

1950s

1954

Evgeny Maleev described the new genus and species Therizinosaurus cheloniformis. from the Nemegt Formation He interpreted it as a gigantic turtle. Maleev also named the family Therizinosauridae to contain this species.^[1]

1960s

1964

Zakharov described and named the ichnogenus Macropodosaurus, which is represented by a series of four-toed footprints.^[2]

1970s

Referred arms to *Therizinosaurus* by Barsbold

1970

Rozhdestventsky first proposed the idea that therizinosaurids were actually theropod dinosaurs. He thought they used their large claws to tear open termite mounds or collect fruit from trees.^[3]
Osmolska and Roniewicz also interpreted Therizinosaurus as a carnosaur theropod.^[4]

1976

Barsbold proposed the Deinonychosauria and included Therizinosaurus as a member.^[5]
In another paper during the same year, Barsbold referred a shoulder and forearm found in the same strata as the Therizinosaurus type specimen to that genus because of the resemblance between the specimens claws. He observed that the anatomy of the arm and shoulder remains suggested that it belonged to a theropod dinosaur. Barsbold also remarked on similarities it shared with Deinocheirus, another mysterious dinosaur from the same rock unit.^[6]

1979

Dong described the new genus and species Nanshiungosaurus brevispinus based on a vertebral column and pelvis. He interpreted Nanshiungosaurus as a new genus of dwarf sauropods. He also described the new species Chilantaisaurus zheziangensis but interpreted it as a carnosaur.^[7]
Perle described the new genus and species Segnosaurus galbinensis based on mostly complete limbs and girdles. He erected a new family, the Segnosauridae, for this unusual dinosaur. He tentatively regarded it as a theropod.^[8]

1980s

Prosauropod-like restoration of *Erlikosaurus*

1980

Barsbold and Perle named the Segnosauria and described the new genus and species Erlikosaurus andrewsi. They also described in brief detail an unknown segnosaur. Barsbold and Perle thought segnosaurs were slow, semi-aquatic animals.^[9]

1981

Perle redescribed the holotype of Erlikosaurus but this time in more detail and mispelled Erlicosaurus.^[10]

1982

Perle reported an unusual partial four-toed hind limb from Hermiin Tsav, Nemegt Formation. Because this partial leg was found not far from where Barsbold reported the shoulder and humerus he referred to Therizinosaurus, Perle thought that his specimen also probably belonged to that taxon. Since this leg was similar to those of segnosaurs, he classified Therizinosaurus as a segnosaur.^[11]

1983

Barsbold described the new genus and species Enigmosaurus mongoliensis based on a partial pelvis from the previously unknown segnosaur. Barsbold regarded Enigmosaurus as so unusual that he gave it its own family, the Enigmosauridae.^[12]

1984

Paul suggested that segnosaurs shared an evolutionary relationship with prosauropods and ornithischians. He thought this implied that they were probably herbivores.^[13]

1986

Gauthier considered segnosaurs to be relatives of sauropodomorphs.^[14]

1989

Sereno also followed this new interpretation of segnosaurs.^[15]

1990s

1990

Barsbold and Maryanska reinterpreted the sauropod Nanshiungosaurus and the carnosaur Chilantaisaurus as segnosaurs. They agreed with Perle that the partial hind limb from Hermiin Tsav he described in 1982 was segnosaurian, but casted doubt with his referral of it to Therizinosaurus, and therefore with his subsequent conclusion that Therizinosaurus was a segnosaur. Barsbold and Maryanska also disagreed with previous researchers who classified Deinocheirus as a segnosaur.^[16]
David B. Norman considered Therizinosaurus to be a theropod of uncertain classification.^[17]

1992

A collaborative expedition between Chinese and Japanese scientists discovered the type specimen of the new segnosaur species. In addition, Dong named the Segnosaurischia to place segnosaurs on an equal rank with Saurischia and Ornithischia.^[18]

Skeletal composite of Alxasaurus specimens

1993

Russel and Dong described the new genus and species Alxasaurus elsitaiensis. They considered it distinct enough to warrant its own family, the Alxasauridae. They pointed out similar anatomical traits in the anatomy of the hand of the partial forlimb Barsbold referred to Therizinosaurus in 1976 and those of segnosaurs. They concluded that therizinosaurids and segnosaurids were theropods and almost identical in traits, and synonymized the Therizinosauridae and Segnosauridae, with the former having nomenclatural priority and coined the superfamily Therizinosauroidea to contain Alxasaurus and its family. The relative completeness of the specimens concluded the debate on whether or not segnosaurs were theropods in the affirmative.^[19]
Russell and Russell noticed that segnosaurs had similar body plans to chalicotheres and ground sloths and concluded that they may have used their large forelimbs to forage in a similar manner.^[20]

1994

Clark and others redescribed the skull of Erlikosaurus. They found more evidence that segnosaurs were theropods and classified them as maniraptorans.^[21]

1995

Nessov speculated that segnosaurs may have hung from trees using their large claws like sloths do and fed on wasp nests. He reported the discovery of segnosaur remains in Kazakhstan and Uzbekistan.^[22]

1996

Currie attributed some Late Cretaceous eggs and their embryos from the Nanchao Formation of Henan, China to segnosaur dinosaurs. These spherical eggs still preserve the fossilized remains of their developing embryos.^{[citation needed]}
In a second paper, Currie attributed another kind of fossil egg from an entirely different oofamily to segnosaurs. Unlike the spherical eggs of his first paper, these huge "elongated" eggs are classified as members of the Elongatoolithidae and could reach lengths of up to 50 cm.^{[citation needed]}

1997

Manning and others did not agree with Currie's referral of elongatoolithid eggs to segnosaurs.^[23]
Dong and Yu described the new species "Nanshiungosaurus bohlini" discovered during the 1992 Sino-Japanese expedition, and coined the Nanshiungosauridae to contain it and Nanshiungosaurus.^[24]
Rusell coined the Therizinosauria in order to contain all segnosaurs. This new infraorder was composed of Therizinosauroidea and the more advanced Therizinosauridae. With this, the terms segnosaur and Segnosauria became synonyms to therizinosaur and Therizinosauria, respectively.^[25]

1998

Zhao and Xu reported the existence of a possible therizinosaur dentary dating all the way back to the Early Jurassic.^[26]

1999

Xu, Tang, and Wang described the new genus and species Beipiaosaurus inexpectus. The type specimen actually preserves impressions of the animal's feathered integument. It was also the oldest known therizinosaur.^[27]
Carpenter reported that the embryos Currie considered therizinosaurian had teeth in their premaxillae, unlike any known member of the group. This could be evidence that the egglayer was actually primitive for a therizinosaur. He also did not confirm Currie's referral of elongatoolithid eggs to therizinoasaurs.^[28]

21st century

2000s

2000

Manning and others observed that the embryos identified by Currie in 1996 as therizinosaurian had "an unusual pattern of tooth replacement in which a slender, elongate tooth is replaced by a symmetrical, denticulate tooth". Contrary to Carpenter's claim in 1999, Manning and his colleagues reported the embryos premaxillae as toothless.^[29]

Holotype elements from N. mckinleyi

Holotype dentary of Eshanosaurus

Holotype braincase of N. mckinleyi

2001

Xu, Zhao, and Clark described the new genus and species Eshanosaurus deguchiianus based on the Early Jurassic dentary. This species was the probably oldest known therizinosaur.^[30]
Kirkland and Wolfe described the new genus and species Nothronychus mckinleyi. This was the first definitive therizinosaurid discovered outside of Asia. They also found that Eshanosaurus had a similar dentition to prosauropods.^[31]
Zhang and others described the new genus and species Neimongosaurus yangi.^[32]

2002

Xu and others described the new genus and species Erliansaurus bellamanus.^[33]

2004

Kirkland and colleagues briefly reported and described primitive remains of therizinosaurs found in Utah.^[34]
The same team made comparisons with braincases found among the remains and that of Nothronychus mckinleyi.^[35]
Lindsay Zanno continue with these short descriptions but this time focused on forelimb elements.^[36]
Zanno discussed in more detail these elements in her Ph.D.^[37]

2005

Kirkland and others described the primitive new genus and species Falcarius utahensis based on the multiple remains previously described.^[38]

2006

Zanno and Erickson briefly discussed the growth of Falcarius which was represented by adult and juvenile specimens.^[39]
Zanno formally published and described the pectoral anatomy of Falcarius.^[40]
Bursh reported the inferred range of motion in the therizinosaurids Neimongosaurus, which was very pronounced and circular.^[41]
Sennikov re-examined Macropodosaurus and concluded that a therizinosaurid-grade dinosaur made those tracks, suggesting a possible plantigrade stance. He also considered these tracks to be more associated with therizinosaurids.^[42]

2007

Embryonic therizinosaurid based on Nanchao embryos

Li and others described the new genus and species Suzhousaurus megatherioides.^[43]
Kundrát with colleagues described in detail the embryos from the Nanchao Formation.^[44]

2008

A new specimen of Suzhousaurus was described by Li and colleagues.^[45]
Lee and colleagues reported new therizinosaurid specimens composed of partially complete skeletons collected from the Nemegt Formation.^[46]

2009

Zanno and colleagues described the newer N. graffami, a second and more complete species of the genus Nothronychus.^[47]
Barrett considered that the controversial Eshanosaurus was a therizinosaur taxon.^[48]

2010s

2010

Zanno described in detail the osteology of Falcarius based on numerous specimens.^[49]
Zanno conducted the most detailed phylogenetic analysis of the Therizinosauria to that point. She cited the inaccessibility, damage, potential loss of holotype specimens, scarcity of cranial remains, and fragmentary specimens with few overlapping elements as the most significant obstacles to resolving the evolutionary relationships within the group. She also revised Therizinosauroidea to exclude Falcarius and retained it in the wider clade Therizinosauria, which became the senior synonym of Segnosauria.^[50]

2011

Smith and team described in detail the braincase anatomy of Falcarius.^[51]

Skeletal restoration of *Jianchangosaurus*

2012

Qian and colleagues discussed the affinities of Chilantaisaurus zheziangensis and noted that is actually a therizinosaurid. Tiantaisaurus was briefly mentioned but not officially named.^[52]
Lautenschlager with colleagues reconstructed the cranial cavities of Erlikosaurus via CT scans and noted a complex ear and brain structure that may apply to other therizinosaurids.^[53]
Senter with others described the new genus and species Martharaptor greenriverensis.^[54]
Fiorillo and Adams described four-toed footprints from the Cantwell Formation. The morphology is similar to therizinosaurid feet but slighlty different from Macropodosaurus. Nevertheless, they attributed these tracks to therizinosaurids.^[55]

2013

Lautenschlager performed digital reconstructions for the cranial musculature in Erlikosaurus and found the bite force of Edmontosaurus being greater than that for the former. The lesser bite force for Erlikosaurus better served in stripping and cropping leaves, rather than active mastication.^[56]
Using the complete holotype skull of Erlikosaurus, Lautenschlager and colleagues noted that the keratinous beak in therizinosaurs and most other beaked theropods was an adaption that might have helped to enhance cranial stability by mitigating the stress and strain experienced by the skull during feeding.^[57]
Pu with colleagues described the new primitive genus and species Jianchangosaurus yixianensis. They regarded this genus along with Falcarius was the most primitive.^[58]
Kobayashi and colleagues reported an exceptional nesting ground site of therizinosaurid dinosaurs at the Javkhlant Formation, which contained at least 17 dendroolithid egg clutches.^[59]

2014

Lautenschlager concluded that the claws of most therizinosaurs were more effective when piercing or pulling down vegetation but not for digging. He could neither confirm nor disregard that the hand claws could have been fully used for sexual display, self-defense, intraspecific competition, mate-gripping during mating or grasping stabilization when foraging.^[60]

2015

The osteology and taphonomy of Nothronychus was fully described by Hedrick and colleagues, providing anatomical considerations for other therizinosaurids.^[61]
Gierlinski reported Macropodosaurus footprints in Poland.^[62]

2016

Zanno with colleagues redescribed the complex lower jaws and dentition of Segnosaurus and noticed a niche partitioning between this taxon and Erlikosaurus.^[63]
Sues and Averianov described extensive remains of therizinosauroid and potentially therizinosaurid remains from the Bissekty Formation.^[64]

2017

Lautenschlager concluded the evolutionary trends in jaw mechanics of therizinosaurs suffered a change from higher bite forces and robust lower jaws in early members to lesser ones in derived therizinosaurs.^[65]
Masrour with colleagues reported Macropodosaurus footprints on Cretaceous strata in Morocco.^[66]

2018

The holotype braincase of Nothronychus mckinleyi was re-analyzed by Smith with colleagues finding similar traits and capacities to Erlikosaurus.^[67]
Fiorillo and team found more therizinosaurid tracks from the Cantwell Formation but this time in association with hadrosaurid footprints. They were the first authors providing photographs of the holotype Erlikosaurus feet.^[68]

2019

Hartman with colleagues performed a large phylogenetic analysis for the Therizinosauria and other theropod groups. This analysis was strongly based on the 2010 work of Zanno.^[69]
Yao and colleagues described the possible new genus and species Lingyuanosaurus sihedangensis.^[70]
Liao and Xu redescribed the holotype skull of Beipiaosaurus in detail, noting new unique cranial traits for the genus.^[71]
Ali Nabavizadeh concluded that most therizinosaurs were mainly orthal feeders (moving their jaws up and down and not to the sides) and raised their jaws isognathously whereby the upper and lower teeth of each side contacted each other at once.^[72]
Button and Zanno found that Segnosaurus had gracile skulls and relatively low bite forces, indicating a food processing in the gut. Erlikosaurus had features associated with extensive processing such as the lower jaws or dentition and therefore, the food processing was in the mouth.^[73]
The Javkhlant Formation nesting site was formally described in 2019 by Kohei Tanaka and colleagues concluding that egg clutches were covered in organic-rich material during incubation and colonial nesting first evolved in non-avian dinosaur to increase hatching success.^[74]

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^ Zanno, L. E. (2010). "Osteology of Falcarius utahensis (Dinosauria: Theropoda): characterizing the anatomy of basal therizinosaurs". Zoological Journal of the Linnean Society. 158 (1): 196–230. doi:10.1111/j.1096-3642.2009.00464.x.
^ Zanno, L. E. (2010). "A taxonomic and phylogenetic re-evaluation of Therizinosauria (Dinosauria: Maniraptora)". Journal of Systematic Palaeontology. 8 (4): 503−543. doi:10.1080/14772019.2010.488045.
^ Smith, D. K.; Zanno, L. E.; Sanders, R. K.; Deblieux, D. D.; Kirkland, J. I. (2011). "New information on the braincase of the North American therizinosaurian (Theropoda, Maniraptora) Falcarius utahensis". Journal of Vertebrate Paleontology. 31 (2): 387−404. doi:10.1080/02724634.2011.549442. JSTOR 25835833.
^ M.-p. Qian, Z.-y. Zhang, Y. Jiang, Y.-g. Jiang, Y.-j. Zhang, R. Chen, and G.-f. Xing (2012). "Cretaceous therizinosaurs in Zhejiang of eastern China". Journal of Geology. 36 (4): 337−348.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ Lautenschlager, S.; Emily, J. R.; Perle, A.; Zanno, L. E.; Lawrence, M. W. (2012). "The Endocranial Anatomy of Therizinosauria and Its Implications for Sensory and Cognitive Function". PLOS ONE. 7 (12): e52289. Bibcode:2012PLoSO...752289L. doi:10.1371/journal.pone.0052289. PMC 3526574. PMID 23284972.
^ Senter, P.; Kirkland, J. I.; Deblieux, D. D. (2012). "Martharaptor greenriverensis, a New Theropod Dinosaur from the Lower Cretaceous of Utah". PLOS ONE. 7 (8): e43911. Bibcode:2012PLoSO...743911S. doi:10.1371/journal.pone.0043911. PMC 3430620. PMID 22952806.
^ Fiorillo, A. R; Adams, T. L. (2012). "A Therizinosaur Track from the Lower Cantwell Formation (upper Cretaceous) of Denali National Park, Alaska". PALAIOS. 27 (6): 395−400. Bibcode:2012Palai..27..395F. doi:10.2110/palo.2011.p11-083r.
^ Lautenschlager, S. (2013). "Cranial myology and bite force performance of Erlikosaurus andrewsi : a novel approach for digital muscle reconstructions". Journal of Anatomy. 222 (2): 260−272. doi:10.1111/joa.12000. PMC 3632231. PMID 23061752.
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^ "First record of a dinosaur nesting colony from Mongolia reveals nesting behavior of therizinosauroids". Hokkaido University. 2013.
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^ Sues, H.-D.; Averianov, A. (2016). "Therizinosauroidea (Dinosauria: Theropoda) from the Upper Cretaceous of Uzbekistan". Cretaceous Research. 59: 155−178. doi:10.1016/j.cretres.2015.11.003.
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^ Masrour, M.; Lkebir, N.; Pérez-Lorente, F. (2017). "Anza palaeoichnological site. Late Cretaceous. Morocco. Part II. Problems of large dinosaur trackways and the first African Macropodosaurus trackway". Journal of African Earth Sciences. 134: 776−793. Bibcode:2017JAfES.134..776M. doi:10.1016/j.jafrearsci.2017.04.019. ISSN 1464-343X.
^ Smith, D. K.; Sanders, R. K.; Wolfe, D. G. (2018). "A re-evaluation of the basicranial soft tissues and pneumaticity of the therizinosaurian Nothronychus mckinleyi (Theropoda; Maniraptora)". PLOS ONE. 13 (7): e0198155. doi:10.1371/journal.pone.0198155. PMC 6067709. PMID 30063717.
^ Fiorillo, A. R.; McCarthy, P. J.; Kobayashi, Y.; Tomsich, C. S.; Tykoski, R. S.; Lee, Y.-N.; Tanaka, T.; Noto, C. R. (2018). "An unusual association of hadrosaur and therizinosaur tracks within Late Cretaceous rocks of Denali National Park, Alaska". Scientific Reports. 8 (11706). doi:10.1038/s41598-018-30110-8. PMC 6076232. PMID 30076347.
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^ Xi Yao; Chun-Chi Liao; Corwin Sullivan; Xing Xu (2019). "A new transitional therizinosaurian theropod from the Early Cretaceous Jehol Biota of China". Scientific Reports. 9: Article number 5026. doi:10.1038/s41598-019-41560-z. PMC 6430829. PMID 30903000.
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^ Nabavizadeh, A. (2019). "Cranial musculature in herbivorous dinosaurs: a survey of reconstructed anatomical diversity and feeding mechanisms". The Anatomical Record: 32. doi:10.1002/ar.24283. PMID 31675182.
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