Revision of the Eocene ‘ Platyrhina’ species from the Bolca Lagerst atte (Italy) reveals the first panray (Batomorphii: Zanobatidae) in the fossil record
Author
Marram ̀, Giuseppe
Universita degli Studi di Torino, Dipartimento di Scienze della Terra, via Valperga Caluso 35, 10125 Torino, Italy; & University of Vienna, Department of Palaeontology, Althanstrasse 14, 1090 Vienna, Austria;
Author
Carneval, Giorgio
Author
Claeso, Kerin M.
Author
Naylo, Gavin J. P.
Author
Kriwe, Jurgen
text
Journal of Systematic Palaeontology
2020
2020-07-13
18
18
1519
1542
http://dx.doi.org/10.1080/14772019.2020.1783380
journal article
10.1080/14772019.2020.1783380
1478-0941
PMC7455076
32939187
10932527
B4C7A979-7972-409B-B489-A6DDD5E35FE5
Genus †
Plesiozanobatus
gen. nov.
Type species.
†
Torpedo egertoni
De Zigno, 1876
.
Diagnosis.
Pectoral disc large and roughly rounded, representing 56–70% TL; tail stout and short, distinctly demarcated from the disc; two dorsal fins and caudal fin present; densely, closely set small dermal denticles forming a continuous pavement; large, rounded, scattered thorns covering the entire disc and tail; rostral cartilage absent; nasal capsules laterally expanded without horn-like processes; long propterygia extending near the anterior margin of the disc; mesopterygium absent; about 65–75 pectoral radials; puboischiadic bar narrow and moderately arched; approximately 20 pelvic-fin rays; 80–90 vertebrae; about 10 pairs of ribs.
Derivation of name.
From the Ancient Greek word
pλGR
ί
o
u
(
pl̄eśıon
) meaning ‘near’ or ‘close’, and
Zanobatus
, to remark upon its close relationship with the living panray genus.
Included species.
Type
species only.
Remarks.
De Zigno (1876)
considered that the overall similarity of the disc shape and the absence of a tail sting on the holotypic specimen
MGP-PD
154Z justified the assignment of this species to the genus
Torpedo
. Later,
Jaekel (1894)
, analysing additional, better preserved material, assigned the species †
T. egertoni
to
Platyrhina
. However, he noticed that the fossil species from Bolca might have been more closely related to
Platyrhina schoenleinii
than to
Platyrhina sinesensis
because of the general shape and proportions of the body and disc, as well as the arrangement of the pectoral radials and gill arches.
Platyrhina schoenleinii
is currently recognized as
Zanobatus schoenleinii
(see Compagno 1999).