Mosaic of plesiomorphic and derived characters in an Eocene myliobatiform batomorph (Chondrichthyes, Elasmobranchii) from Italy defines a new, basal body plan in pelagic stingrays

Table 1 Morphometric and meristic data of the two specimens of Promyliobatis gazolai

	MCSNV VII.B.90/91		MSNPV 14620
Measurements	mm	% DW	mm	% DW
Total length	?	?	497.3	220.2
Disc length	164.0	70.3	134.9	60.8
Disc width	233.3	100.0	225.8	100.0
Tail length	?	?	375.6	166.3
Preoral length	23.1	9.9	?	?
Mouth-scapulocoracoid distance	64.5	27.7	69.5	30.8
Scapulocoracoid width	48.5	20.8	46.1	20.4
Pelvic girdle width	40.2	17.2	42.9	19.0
Sting length	50.8	21.8	51.5	22.8
Pelvis-tip of tail length	?	?	333.2	147.6
Pre-sting length	393.9^a	168.8 ^a	319.9	141.7
Distance from tip of disc to max width disc	82.8	35.5	62.5	27.7
Prepelvic distance	136.6	58.6	130.1	57.6
Prescapular distance (head length)	64.8	27.8	80.4	35.6
Pelvic fin length	47.6	20.4	?	?
Pectoral-fin insertion to sting	240.6 ^a	103.1 ^a	181.3	80.3
Meristics
Propterygial radials	35		?
Mesopterygial radials	12		10
Metapterygial radials	40		?
Total pectoral radials	87		?
Pelvic radials	22–23		?
Vertebrae from scapulocoracoid to pelvic girdle	22		20
Vertebrae from pelvic girdle to sting	?		148
Vertebrae posterior to sting	?		50
Total vertebrae	?		218
Sting serrations per side	?		25

^a Data might not be reliable because the tail sting of MCSNV VII.B.90/91 appears to have been positioned incorrectly during the historical restoration of the slab

ISSN: 2056-306X