Species
Streptis undifera (Schmidt, 1858)
Type specimen data
neotype: Department of Geology, TalTech GIT 626-64, Porkuni quarry (Estonia, Porkuni) , Porkuni Stage (Porkuni Stage; Hirnantian)  , incorrect number in article
Synonymy list
1858     Spirigerina? undifera sp. nov. — Schmidt , pp. 210
1936     Streptis incompta sp. nov. — Ulrich et Cooper , pp. 345, fig. 50: 13, 25-27, 29, 30, 33-35
1960     Streptis incompta Ulrich et Cooper, 1936 — Nikiforova , fig. 26: 11-13
1965     Streptis undifera (Schmidt, 1858) — Wright , pp. 474-476, fig. 1: 1-4
1986     Streptis undifera (Schmidt, 1858) — Hints , pp. 21-23, fig. 1: 1-18
2013     Streptis undifera (Schmidt, 1858) — Hints, Popov et Holmer , pp. 965, fig. 2-4
2017     Streptis undifera (Schmidt, 1858) — Harper et al. , fig. 5T
Selection of related publications
Holmer, L. E., Popov, L. E., Ghobadi Pour, M., Zhang, Z., Zhang, Z. 2017. Unusual pitted Ordovician brachiopods from the East Baltic: the significance of coarsely pitted ornamentations in linguliforms.  Papers in Palaeontology   3,   3,   387-399.  Wiley.  DOI:10.1002/spp2.1080
Hints, L., Popov, L., Holmer, L. E. 2013. Morphology, ontogeny and affinities of the Hirnantian triplisiid brachiopod Streptis undifera from Baltoscandia.  Palaeontology   56,   5,   961-970. DOI:10.1111/pala.12028
Hints, L. 2012. New Hirnantian orthide brachiopods from the type section of the Porkuni Stage (Porkuni quarry, northeastern Estonia).  Estonian Journal of Earth Sciences   61,   4,   227–241. DOI:10.3176/earth.2012.4.04
Kaljo, D., Hints, L., Männik, P., Nõlvak, J. 2008. The succession of Hirnantian events based on data from Baltica: brachiopods, chitinozoans, conodonts, and carbon isotopes.  Estonian Journal of Earth Sciences   57,   4,   197-218. DOI:10.3176/earth.2008.4.01
Hints, L. 1986. Genus Streptis (Triplesiidae, Brachiopoda) from the Ordovician and Silurian of Estonia.  Eesti NSV Teaduste Akadeemia Toimetised. Geoloogia / Известия Академии наук Эстонской ССР. Геология   35,   1,   20-26. DOI:10.3176/geol.1986.1.03
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Brachiopoda | 
| Subphylum | Rhynchonelliformea | 
| Class | Strophomenata | 
| Order | Orthotetida | 
| Suborder | Triplesiidina | 
| Superfamily | Triplesoidea | 
| Family | Triplesiidae | 
| Genus | Streptis | 
| Species | altosinuata | 
| grayii | |
| monilifera | |
| undifera | 
References based on distribution
- Holmer et al., 2017 Porkuni quarry Porkuni Stage