Psammolepis

Psammolepis

 

a genus of extinct Agnatha that lived during the Devonian. The body, which reached 80 cm in length, was broad and flat and covered with a large carapace of three-layer bony plates. There were ten species. The animals lived in rapidly flowing rivers and fed on benthic animals. Scales and carapace plates have been found in sandy delta deposits of the Middle and Upper Devonian on the East European Plain and in Scotland.

REFERENCE

Obruchev, D. V., and E. Iu. Mark-Kurik. Psammosteidy (Agnatha, Psammosteidae) devona SSSR. Tallinn, 1965.
References in periodicals archive ?
The lowermost vertebrate-bearing layer (layers 7 and 8) yields rare isolated skeletal elements of the psammosteid Psammolepis sp.
2A-V), Psammolepis toriensis (Mark-Kurik), Tartuosteus?
The following taxa have been recorded here: Guerichosteus heterolepis, Psammolepis toriensis, Actinolepis tuberculata, Byssacanthus dilatatus, Glyptolepis sp.
13, figs 3, 4; Glinskiy & Mark-Kurik 2016) suggests that enameloid is certainly present in such psammosteids as Drepanaspis gemuendenensis Schluter, 1887, Guerichosteus kozlowskii, Psammolepis arctica (Kiaer, 1915) and Psammosteus livonicus Obruchev 1965 (in Obruchev & Mark-Kurik 1965).
Ivanov in 1984 in association with numerous isolated branchial plates, lateral scales and various micromeric elements of Psammolepis undulata (Agassiz, 1844), Psammosteus livonicus Obruchev, 1965 (see hereinafter in Obruchev & Mark-Kurik 1965), P.
was found in association with numerous branchial plates, dorsal plates, ridge scales and rare micromeric elements of different psammosteids (Glinskiy 2013): Psammolepis venyukovi Obruchev, 1965, Psammolepis undulata, Psammosteus livonicus, P.
striatus (Gross), Tartuosteus giganteus (Gross) and Psammolepis proia Mark-Kurik; the placoderms Actinolepis tuberculata Agassiz, Heterostius ingens Asmuss, Homostius latus Asmuss, Coccosteidae, Asterolepis sp.
The assemblage comprises the psammosteids Pycnosteus palaeformis Preobrazhensky, Tartuosteus giganteus (Gross) and Psammolepis proia Mark-Kurik (Glinskiy 2012); the placoderms Actinolepis tuberculata Agassiz, Heterostius ingens Asmuss, Homostius latus Asmuss, Coccosteidae, Asterolepis sp.
Psammolepis abavica Mark-Kurik is the zonal form in the upper part of the Burtnieki RS (Abava Mb), as is Psammolepis paradoxa Agassiz in the Gauja RS.
Correlation of the Amata RS with the Nairn Sandstone is based on the psammosteid species Psammolepis undulata Agassiz (Ahlberg et al.