Species
Orthis callactis Dalman, 1828
Synonymy list
1828     Orthis callactis sp. nov. — Dalman , pp. 112, fig. 2; 2
1830     Orthis crassicosta sp. nov. — Pander , pp. 82, fig. 21; 1
1953     Orthis callactis Dalman 1828 — Alikhova , pp. 28-30, fig. 1; 13-16
1961     Orthis callactis (?) Dalman, 1828 — Rubel , pp. 172-173, fig. 14; 16, 17
1993     Orthis callactis Dalman 1828 — Jaanusson et Bassett , pp. 54-56, fig. 8: 1-8
Selection of related publications
Rubel, M. P. 1961. Lower-Ordovician brachiopods of the superfamilies Orthacea, Dalmanellacea and Syntrophiacea of Eastern Baltic.  ENSV TA Geoloogia Instituudi Uurimused   VI,      141-226.
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Brachiopoda | 
| Subphylum | Rhynchonelliformea | 
| Class | Rhynchonellata | 
| Order | Orthida | 
| Suborder | Orthidina | 
| Superfamily | Orthoidea | 
| Family | Orthidae | 
| Genus | Orthis | 
| Species | callactis |