Lülijalgsed ehk artropoodid on väga laialt levinud ja mitmekesine selgrootute loomade hõimkond, mis moodustab kõikidest tänapäeval elavatest liikidest umbes kolm neljandikku. Siia hõimkonda kuuluvad: lõugtundlased, hulkjalgsed, heksapoodid, vähid ning tänapäevaks väljasurnud trilobiidid. Lülijalgsetele iseloomulik kehaehitus - lüliline keha, lülilised jäsemed ning kõva kitiinist eksoskelett - ilmusid esmakordselt juba Kambriumi alguses. Viimase 540 miljoni aasta jooksul on kõik viis lülijalgsete alamhõimkonda kohastunud nii merelise, magedaveelise kui maapealse elukeskkonnaga.
hõimkond
Arthropoda Siebold, 1848
Taksoni iseloomustus
Valik taksonit käsitlevast teaduskirjandusest
Ebbestad, J. O. R., Pärnaste, H., Høyberget, M., Nielsen, A. T., Rojo, M. A. 2025. Two early cheirurine trilobites and their later relatives in the Ordovician of Baltoscandia.  Norwegian Journal of Geology   105,   2,    DOI:https://dx.doi.org/10.17850/njg105-2-3
Weidner, T., Nielsen, A. T., Ebbestad, J. O: 2024. A new agnostoid from the Cambrian of Scandinavia Tomagnostella tullbergi n. sp. (Agnostidae) from the middle Cambrian Lejopyge laevigata Zone of Scandinavia.  Bulletin of the Geological Society of Denmark   73,      193-198. DOI:10.37570/bgsd-2024-73-11
Kröger, B., Toom, U., Männik, P., Ernst, A. 2024. Stop 7: Rummu quarry.  XI Baltic Stratigraphical Conference. Abstracts and Field Guide, pp. 101-106.   Geological Society of Estonia. 
Meidla, T., Tinn, O., Männik, P. 2024. Stop 13: Soeginina cliff.  XI Baltic Stratigraphical Conference. Abstracts and Field Guide, pp. 123-125.   Geological Society of Estonia. 
Hints, O. 2024. Stop 5: Pakerort cliff, Pakri Peninsula.  XI Baltic Stratigraphical Conference. Abstracts and Field Guide, pp. 93-98.   Geological Society of Estonia. 
Bicknell, R. D. C., Vargas-Parra, E. E., Landman, N. H., Pärnaste, H. 2024. Evidence for cryptic molting behavior in the trilobite Toxochasmops vormsiensis from the Upper Ordovician Katian Kõrgessaare Formation, Estonia.  The Science of Nature   111,   3,    DOI:10.1007/s00114-024-01906-8
Melnikova, L. M., Mirantsev, G. V., Terentiev, S. S., Anekeeva, G. A. 2022. Ostracods of the Gryazno Formation (Upper Ordovician, Sandbian Stage and Idavere Regional Stage) in the West of Leningrad Region.  Paleontological Journal   56,   5,   510-525. DOI:10.1134/S0031030122050082
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Weidner, T., Ebbestad, J. O. R. 2018. Anopolenus henrici Salter, a middle Cambrian (Drumian) centropleurid trilobite from the Alum Shale Formation of Scandinavia.  Bulletin of the Geological Society of Denmark   66,      223-228. DOI:10.37570/bgsd-2018-66-13
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Rushton, A., Weidner, T., Ebbestad, J. 2016. Paradoxidid trilobites from a mid-Cambrian (Series 3, stage 5) limestone concretion from Jämtland, central Sweden.  Bulletin of Geosciences   91,   3,   515-552. DOI:10.3140/bull.geosci.1606
Truuver, K., Meidla, T. 2015. A Hirnantian deep-water refuge for warm-water ostracods in Baltoscandia.  Geological Quarterly   59,   4,   738-749. DOI:10.7306/gq.1258
Høyberget, M., Ebbestad, J. O. R., Funke, B., Nakrem, H. A. 2015. The shelly fauna and biostratigraphy of the lower Cambrian (provisional series 2, stage 4) Evjevik Member, Ringstrand Formation in the Mjøsa area, Norway.  Norwegian Journal of Geology   95,   1,   23-56. DOI:10.17850/njg95-1-02
Rasmussen, B. W., Nielsen, A. T., Schovsbo, N. H. 2015. Faunal succession in the upper Cambrian (Furongian) Leptoplastus Superzone at Slemmestad, southern Norway.  Norwegian Journal of Geology   95,   1,   1-22. DOI:10.17850/njg95-1-01
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Hints, L., Männik, P. 2014. Stop A10: Porkuni quarry.  4th Annual Meeting of IGCP 591, Estonia, 10-19 June 2014. Abstracts and Field Guide, pp. 167-172.   University of Tartu. 
Bergström, J., Zhiqiang, Z., Ahlberg, P., Axheimer, N. 2014. Upper lower Cambrian (provisional Cambrian Series 2) trilobites from northwestern Gansu Province, China.  Estonian Journal of Earth Sciences   63,   3,   123-143. DOI:10.3176/earth.2014.12
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Hints, L., Pärnaste, H., Gailite, L.-I. 2012. Hirnantia sagittifera (Brachiopoda) and Mucronaspis mucronata s.l. (Trilobita) in the Upper Ordovician of the East Baltic: taxonomy and distribution.  Estonian Journal of Earth Sciences   61,   2,   65-81. DOI:10.3176/earth.2012.2.01
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Pärnaste, H., Popp, A. 2011. First record of Telephina (Trilobita) from the Ordovician of northeastern Estonia and its stratigraphical implications.  Estonian Journal of Earth Sciences   60,   2,   83-90. DOI:10.3176/earth.2011.2.02
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Tinn, O., Meidla, T., Ainsaar, L., Kivioja, K. 2010. Rich and heterogenous fossil ostracod fauna in the Ordovician sediment intrusions at Osmussaar Island, Estonia, reveals an ancient impact event.  GFF   132,   3-4,   201-211. DOI:10.1080/11035897.2010.530351
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Hoel, O. A. 2009. The post-cephalic morphology of the middle Ordovician trilobite Prionocheilus narinosus from the central Oslo Region, Norway.  Norwegian Journal of Geology   89,   3,   247-249.
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Streng, M., Ebbestad, J. O. R., Moczydłowska, M. 2008. A Walcottella-like bradoriid (Arthropoda) from the lower Cambrian of Sweden.  GFF   130,   1,   11-19. DOI:10.1080/11035890801301011
Dies Álvarez, M. E., Gozalo, R., Cederström, P., Ahlberg, P. 2008. Bradoriid arthropods from the lower-middle Cambrian of Scania, Sweden.  Acta Palaeontologica Polonica   53,   4,   647-656. DOI:10.4202/app.2008.0409
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Meidla, T. 2007. Ostracods from the Upper Ordovician Borenshult fauna, Sweden.  GFF   129,   2,   123-132. DOI:10.1080/11035890701292123
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Rushton, A. W. A., Weidner, T. 2007. The Middle Cambrian paradoxidid trilobite Hydrocephalus from Jämtland, central Sweden.  Acta Geologica Polonica   57,   4,   391-401.
Terfelt, F., Ahlgren, J. 2007. Macropyge (Promacropyge) scandinavica new species; the first macropyginid trilobite recorded from the Furongian of Baltica.  Journal of Paleontology   81,   6,   1516-1522. DOI:10.1666/06-020R.1
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Tetlie, O. Erik 2006. Two new Silurian species of Erypterus (Chelicerata: Erypterida) from Norway and Canada and the phylogeny of the genus.  Journal of Systematic Palaeontology   4,   4,   397-412. DOI:10.1017/S147720190600192
Pärnaste, H. 2006. The Early Ordovician trilobite distribution and zonation of the East Baltic.  Proceedings of the Estonian Academy of Sciences. Geology   55,   2,   109-127. DOI:10.3176/geol.2006.2.03
Axheimer, N. 2006. The Middle Cambrian Eodiscoid trilobite Dawsonia oelandica (Westergård, 1936).  Journal of Paleontology   80,   1,   193-200. DOI:10.1666/0022-3360(2006)080[0193:TMCETD]2.0.CO;2
Pärnaste, H. 2006. The earliest encrinurid trilobites from the East Baltic and their taxonomic interest.  Palaeontology   49,   1,   155-170. DOI:10.1111/j.1475-4983.2005.00535.x
Axheimer, N., Eriksson, M. E., Ahlberg, P., Bengtsson, A. 2006. The middle Cambrian cosmopolitan key species Lejopyge laevigata and its biozone: new data from Sweden.  Geological Magazine   143,   4,   447-455. DOI:10.1017/S0016756806002007
Tinn, O., Meidla, T. 2004. Phylogenetic relationships of Early-Middle Ordovician ostracods of Baltoscandia.  Palaeontology   47,   2,   199-221. DOI:10.1111/j.0031-0239.2004.00369.x
Pärnaste, H. 2004. Revision of the Ordovician cheirurid trilobite genus Reraspis with the description of the earliest representative.  Proceedings of the Estonian Academy of Sciences. Geology   53,   2,   125-138. DOI:10.3176/geol.2004.2.03
Owens, R. M. 2004. Late Ordovician and early Silurian Proetida (Trilobita) from north‐western and central Europe.  Palaeontology   47,   3,   557-578. DOI:10.1111/j.0031-0239.2004.00380.x
Holloway, D. J. 2004. The Trilobite Subfamily Monorakinae (Pterygometopidae).  Palaeontology   47,   4,   1015-1036. DOI:10.1111/j.0031-0239.2004.00396.x
Ivantsov, A. Yu., Melnikova, L. M. 2003. Aseri, Lasnamägi and Uhaku Stages of the Ordovician in the Leningrad Region and the characteristics of trilobites and ostracods.  Stratigraphy and Geological Correlation   11,   4,   24-40.
Tolmacheva, T., Egerquist, E., Meidla, T., Tinn, O., Holmer, L. 2003. Faunal composition and dynamics in unconsolidated sediments: a case study from the Middle Ordovician of the East Baltic.  Geological Magazine   140,   1,   31-44. DOI:10.1017/S001675680200701X
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Pärnaste, H. 2003. The Lower Ordovician trilobite Krattaspis: the earliest cyrtometopinid (Cheiruridae) from the Arenig of the east Baltic.  Special Papers in Palaeontology   70,      241-257.
Bird, C., Clarkson, E. 2003. Observations on the ontogeny of the upper Cambrian trilobite Peltura scarabaeoides westergaardi Henningsmoen, 1957.  GFF   125,   4,   177-190. DOI:10.1080/11035890301254177
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Tinn, O., Meidla, T. 2002. An enigmatic early ?palaeocope ostracode from the Arenig of NW Russia.  Acta Palaeontologica Polonica   47,   4,   685-690.
Waloszek, D., Dunlop, J. A. 2002. A Larval Sea Spider (Arthropoda: Pycnogonida) from the Upper Cambrian 'orsten' of Sweden, and the Phylogenetic Position of Pycnogonids.  Palaeontology   45,   3,   421-446. DOI:10.1111/1475-4983.00244
Krueger, H.-H. 2002. Atractocybeloides, eine kleinwüchsige Trilobitengattung aus baltoskandischen Geschieben und ihrem Anstehenden.  Mitteilungen aus dem Museum für Naturkunde der Humboldt-Universität in Berlin         105-120.
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Rõõmusoks, A. 2000. The new trilobite genus Valdariops from the Harju Series (Upper Ordovician) of Estonia.  Proceedings of the Estonian Academy of Sciences. Geology   49,   1,   28-43. DOI:10.3176/geol.2000.1.03
Ivantsov, A. Yu. 2000. New Taxa of Asaphid Trilobites (Ptychopariida: Asaphinae) from the Ordovician of Leningrad Region.  Paleontologicheski Zhurnal   4,      50-56.
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Leitud liigid
1. ?Sculptaspis priscus Melnikov, 1995 | Kunda lade
3. Aahithis vanspronsenae Schallreuter, 1988 | Ordoviitsium
4. Aahithis varia (Sarv, 1959) | Kunda lade
5. Acadoparadoxides (Acadoparadoxides) pinus (Westergård, 1936) | Wuliu lade
7. Acadoparadoxides (Baltoparadoxides) oelandicus (Sjögren, 1872) | Wuliu lade
9. Acadoparadoxides torelli (Westergård, 1935) | Kambrium
10. Acanthopyge pusilla (Angelin, 1854) | Silur
12. Acaste downingiae (Murchison, 1839) | Ülem-Silur
13. Acastella amatrix Ramsköld et Edgecombe, 1993 | Ludlow
14. Acastella breviceps (Angelin, 1851) | Ludfordi lade
15. Acastella madidipes Ramsköld et Edgecombe, 1993 | Ludlow
16. Acernaspis elliptifrons (Esmark, 1833) | Llandovery
17. Acernaspis estonica Männil, 1970 | Juuru lade
18. Acernaspis incerta Männil, 1970 | Raikküla lade
19. Acernaspis quadrilineata (Angelin, 1851) | Llandovery
20. Acernaspis rectifrons Männil, 1970 | Raikküla lade
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Klassifikatsioon
| organismirühm | Biota | 
| riik | Animalia | 
| hõimkond | Agmata | 
| incertae sedis | |
| Annelida | |
| Arthropoda | |
| alamhõimkond | incertae sedis | 
| Chelicerata | |
| Crustacea | |
| Trilobita | |
| klass | Insecta | 
| Merostomoidea | |
| infraklass | Phosphatocopina | 
| selts | Agnostida | 
| Leperditicopida | |
| Nektaspida | |
| liik | Gdowia | 
| hõimkond | Brachiopoda | 
| Bryozoa | |
| Chordata | |
| Cnidaria | |
| Echinodermata | |
| Hemichordata | |
| Mollusca | |
| Onychophora | |
| Pogonophora | |
| Porifera | |
| Priapulida | |
| alamhõimkond | Lophotrochozoa | 
| klass | Chitinozoa | 
| selts | Hyolithelminthida |