Species
Protopanderodus rectus (Lindström, 1954)
Synonymy list
1954     Acontiodus rectus n. sp. — Lindström , pp. 549, fig. 2:7-11, text fig. 2k-m, 3b
1954     Scandodus rectus n. sp. — Lindström , pp. 593, fig. 4:21-25
1971     Protopanderodus rectus (Lindström, 1955)  — Lindström , pp. 50
1978     Protopanderodus rectus (Lindström, 1955)  — Löfgren , pp. 90, fig. Pl. 3:1-7, Pl.3: 36A-B ; Tex t-fig. 31A-C . 
1993     Protopanderodus rectus (Lindström, 1955)  — Löfgren , fig. 5A-D
1994     Protopanderodus rectus (Lindström, 1955)  — Löfgren , fig. 7:7-10
2001     Protopanderodus rectus (Lindström, 1955) — Rasmussen , pp. 124, fig. 16:1-4
2003     Protopanderodus rectus — Tolmacheva et al. , pp. 33
2018     Protopanderodus rectus — Wu et al. 
Selection of related publications
Männik, P., Viira, V. 2012. Ordovician conodont diversity in the northern Baltic.  Estonian Journal of Earth Sciences   61,   1,   1-14.  Estonian Academy Publishers.  DOI:10.3176/earth.2012.1.01
Viira, V. 2011. Lower and Middle Ordovician conodonts from subsurface of SE Estonia and adjacent Russia.  Estonian Journal of Earth Sciences   60,   1,   1-21. DOI:10.3176/earth.2011.1.01
Löfgren, A., Viira, V., Mens, K. 2005. Conodont biostratigraphy and sedimentary history in the upper Tremadoc at Uuga, Cape Pakri, NW Estonia.  GFF   127,   4,   283-293. DOI:10.1080/11035890501274283
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
Löfgren, A. 1978. Arenigian and Llanvirnian cocodonts from Jämtland, northern Sweden.  Fossils and Strata   13,      1-129.
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Chordata | 
| Class | Conodonta | 
| Genus | Protopanderodus | 
| Species | calceatus | 
| graeai | |
| insculptus | |
| liripipus | |
| rectus | |
| robustus | |
| varicostatus | 
References based on distribution
- Männik & Viira, 2012 Hunneberg Stage
- Tolmacheva et al., 2003a Putilovo quarry, Leningrad Oblast Volkhov Stage