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Description
This year the paleoartist Eloy Manzanero (who had an account here but is not active anymore) proposed a paleoart Inktober challenge on Twitter, focusing on vertebrates. In particular, the subjects of this challenge are mostly obscure genera, not very well known among most of people, but interesting nonetheless.

While last year I did a daily challenge during the whole month, this time I started quite late, partly because I couldn't start on time but also because of hesitation (the challenge is quite demanding and time-consuming). I ended up doing a simplified version of the challenge, showing all the entries in a cladogram without much detailed payed to them.

This piece is the first half of the challenge, corresponding to the first 15 days of October. Its protagonists are:

- Agnathans
1. Myllokunmingia fengjiaoa (Cambrian, China) - one of the oldest known vertebrates
2. Myxinikela siroka (Carboniferous, USA) - a primitive hagfish (it is not written right in the drawing)
3. Promissum pulchrum (Ordovician, S Africa) - a large conodont
4. Birkenia elegans (Silurian-Devonian?, Europe and N America) - an anaspid covered in rod-like scales and with unique doral ornaments
5. Hoelaspis angulata (Devonian. Norway) - an armored ostracoderm with a remarkable head armor
- Jawed fish
6. Microbrachius dicki (Devonian, UK) - a freshwater antiarch placoderm, with organs adapted for internal fertilization (the oldest known)
7. Harpagofututor vollsellorhinus (Carboniferous, USA) - a condrichtyan of uncertain affinities and sexual dimorphism ( males had 2 long strcutures parting from the head)
8. Sibyrhynchus denisoni (Carboniferous, USA) - an iniopterygian (relatives of chimaeras with wing-like pectoral fins) with a lower jaw longer than the upper one
9. Potanichthys xingyensis (Triassic, China) - the oldest known fish adapted for flight/gliding, though it is unrelated to modern flying fishes
10. Amphistium paradoxum (Paleogene, Italy) - an early flatfish, with an incomplete transition of the eyes to 1 side of the body
- Non-amniote tetrapods
11. Platyhystrix rugosus (Carboniferous-Permian, USA) - a temnospondyl with a sail in its back (which was the style at the time)
12. Eocaecilia micropoda (Jurassic, USA) - an early caecilian, with reduced legs and developed eyes
13. Habrosaurus dilatus (Cretaceous-Paleogene, USA) - a large sirenian (the oldest in its family), and a survivor of the K-Pg extinction
14. Limnoscelis paludis (Carboniferous, USA) - a carnivorous and possibly semi-aquatic diadectomorph (an oddity in a group of mostly herbivorous group)
15. Madygenerpeton pustulatus (Triassic, Kyrgyzstan) - an armoured reptiliomorph, possibly terrestrial

The 2nd part will come at the end of the month

Description
This year the paleoartist Eloy Manzanero (who had an account here but is not active anymore) proposed a paleoart Inktober challenge on Twitter, focusing on vertebrates. In particular, the subjects of this challenge are mostly obscure genera, not very well known among most of people, but interesting nonetheless.

While last year I did a daily challenge during the whole month, this time I started quite late, partly because I couldn't start on time but also because of hesitation (the challenge is quite demanding and time-consuming). I ended up doing a simplified version of the challenge, showing all the entries in a cladogram without much detailed payed to them.

This piece is the first half of the challenge, corresponding to the first 15 days of October. Its protagonists are:

- Agnathans
1. Myllokunmingia fengjiaoa (Cambrian, China) - one of the oldest known vertebrates
2. Myxinikela siroka (Carboniferous, USA) - a primitive hagfish (it is not written right in the drawing)
3. Promissum pulchrum (Ordovician, S Africa) - a large conodont
4. Birkenia elegans (Silurian-Devonian?, Europe and N America) - an anaspid covered in rod-like scales and with unique doral ornaments
5. Hoelaspis angulata (Devonian. Norway) - an armored ostracoderm with a remarkable head armor
- Jawed fish
6. Microbrachius dicki (Devonian, UK) - a freshwater antiarch placoderm, with organs adapted for internal fertilization (the oldest known)
7. Harpagofututor vollsellorhinus (Carboniferous, USA) - a condrichtyan of uncertain affinities and sexual dimorphism ( males had 2 long strcutures parting from the head)
8. Sibyrhynchus denisoni (Carboniferous, USA) - an iniopterygian (relatives of chimaeras with wing-like pectoral fins) with a lower jaw longer than the upper one
9. Potanichthys xingyensis (Triassic, China) - the oldest known fish adapted for flight/gliding, though it is unrelated to modern flying fishes
10. Amphistium paradoxum (Paleogene, Italy) - an early flatfish, with an incomplete transition of the eyes to 1 side of the body
- Non-amniote tetrapods
11. Platyhystrix rugosus (Carboniferous-Permian, USA) - a temnospondyl with a sail in its back (which was the style at the time)
12. Eocaecilia micropoda (Jurassic, USA) - an early caecilian, with reduced legs and developed eyes
13. Habrosaurus dilatus (Cretaceous-Paleogene, USA) - a large sirenian (the oldest in its family), and a survivor of the K-Pg extinction
14. Limnoscelis paludis (Carboniferous, USA) - a carnivorous and possibly semi-aquatic diadectomorph (an oddity in a group of mostly herbivorous group)
15. Madygenerpeton pustulatus (Triassic, Kyrgyzstan) - an armoured reptiliomorph, possibly terrestrial

The 2nd part will come at the end of the month