Subfamily

Cyrtometopinae Öpik, 1937

Selection of related publications

Pärnaste, H. 2012. Suurte silmadega väike mereelukas Telephina. Eesti Loodus 6-7, 20-23.

Pärnaste, H. 2008. Xylabion and related genera. Advances in trilobite research, pp. 307-312.

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

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.

Raukas, A., Teedumäe, A. (eds) 1997. Geology and Mineral Resources of Estonia. pp. 1-436. Estonian Academy Publishers.

Männil, Ralf 1958. Trilobites of the families Cheiruridae and Encrinuridae from Estonia. ENSV TA Geoloogia Instituudi Uurimused III, 165-212.

Öpik, A. 1937. Trilobiten aus Estland. Tartu Ülikooli Geoloogia Instituudi Toimetused 52, 1-163.

Öpik, A. 1925. Beiträge zur Kenntnis der Kukruse-(C2-) Stufe in Eesti. I. Acta et Commentationes Universitatis Tartuensis VIII, 5, 1-18. G. Mattiesen.

Schmidt, Fr. 1881. Revision der ostbaltischen silurischen Trilobiten nebst geognostischer Übersicht des ostbaltischen Silurgebiets. Abt. I. Phacopiden, Cheiruriden und Encrinuriden. Mémoires de l´Académie Impériale des Sciences de St.-Petersbourg 30, 1, 1-237.

Nieszkowski, J. 1859. Zusätze zur Monographie der Trilobiten der Ostseeprovinzen, nebst der Beschreibung einiger neuen obersilurischen Crustaceen. Archiv für die Naturkunde Liv-, Ehst- und Kurlands 2, 2, 345-384.

Eichwald, E. von 1840. Ueber das silurische Schichten-system in Esthland. Zeitschrift für Natur- und Heilkunde 1-2, 1-210. DOI:10.5962/bhl.title.150763

List of species

1. Cyrtometopus affinis Angelin, 1854

2. Cyrtometopus clavifrons (Dalman, 1827)

3. Cyrtometopus priscus Tjernvik, 1956

4. Cyrtometopus sembnitzkii (Eichwald, 1840) | Lower Ordovician

5. Hemisphaerocoryphe dolichocephalus (Schmidt, 1881)

6. Hemisphaerocoryphe granulata (Angelin, 1854) | Keila Stage

7. Hemisphaerocoryphe huebneri (Schmidt, 1881) | Haljala Stage

8. Hemisphaerocoryphe inflatus Nikolaisen, 1961

9. Hemisphaerocoryphe platinflata Hansen, 2005 | Volkhov Stage

10. Hemisphaerocoryphe pseudohemicranium (Nieszkowski, 1859) | Kukruse Stage→Keila Stage

11. Hemisphaerocoryphe sphaericus (Esmark, 1883)

12. Hemisphaerocoryphe sulcata Nikolaisen, 1961

13. Hemisphaerocoryphe verrucosus (Brøgger, 1882)

14. Hemisphaerocoryphe? rosenthali (Schmidt, 1881) | Haljala Stage

15. Krattaspis popovi Pärnaste, 2003 | Billingen Stage

16. Krattaspis viridatus Öpik, 1937

17. Krattaspis vitalis Pärnaste, 2003

18. Reraspis kaljoi Männil, 1958 | Kukruse Stage

19. Reraspis latifrons (Warburg, 1925) | Upper Ordovician

20. Reraspis orvikui Pärnaste, 2004 | Kunda Stage

Classification

Organism group	Biota
Kingdom	Animalia
Phylum	Arthropoda
Subphylum	Trilobita
Order	Phacopida
Suborder	Cheirurina
Family	Cheiruridae
Subfamily	Acanthoparyphinae
	Cheirurinae
	Cyrtometopinae
Genus	Cyrtometopus
	Hemisphaerocoryphe
	Krattaspis
	Reraspis
Subfamily	Deiphoninae
	Eccoptochilinae
	Sphaerexochininae
Genus	Parapilekia