Plate 10
Ichthyosaurus breviceps, BMNH 39263. Scale on photo measures 100 mm.
Family Stenopterygiidae Kuhn, 1934
Genus Stenopterygius Ja ek e l , 1904
Stenopterygius Jaekel, 1904: 32
Type species: Stenopterygius quadriscissus (Quenstedt,
1856*).
Diagnosis: Pelvic girdle bipartite, ischium and pubis fused
to form single element. Forefin with 4-6 digits; individual
elements tightly packed proximally; notching in some elements
of leading edge; humerus with 2 distal facets. Paired
fins disproportionate in length, forefin at least twice length
of hindfin. Preflexural vertebrae <90. Small to moderatesized,
skull, and jaw length <1 m, total length <6 m and
commonly <4 m.
* See remarks regarding the date 1856.
Stenopterygius quadriscissus (Quenstedt, 1856)
Fig. 8 3 ; PI. 11
Ichthyosaurus acutirostris Owen; Wagner, 1852A: 509
Ichthyosaurus acutirostris microdon W agner 1 852A: 516
[partim]
Ichthyosaurus quadriscissus Quenstedt, 1856: 219
Ichthyosaurus quadriscissus; Seeley, 1880: 71
Ichthyosaurus quadriscissus; F raas 1891: 46 [partim]
Stenopterygius quadriscissus; Wiman, 1921: 19 [partim]
Stenopterygius quadriscissus; Huene 1922: 4 0 [partim]
Stenopterygius quadriscissus; Huene 1931A: 3 49 [partim]
Stenopterygius quadriscissus eos Huene, 1931A: pL 1, fig. 4
Stenopterygius quadriscissus incessa H uene, 1 931A: pi. 1,
fig. 2
Stenopterygius quadriscissus intercedens Huene, 1931 A: pi. 1,
fig. 5
Ichthyosaurus quadriscissus; Hauff, 1936: figs. 3-4
Stenopterygius eos Huene, 1949: 81, figs. 1-2
Stenopterygius incessa H uene, 1949: 84
Fig. 82. Ichthyosaurus conybeari (BGS 956). A) complete skeleton. B) skull (somewhat simplified, and partially exposed right side not
shown). C) forefin, depicted as a left, in dorsal view. D) hindfin, depicted as a left, in dorsal view. Scales equal 100 mm (A-B) and
25 mm.
Stenopterygius quadriscissus; Huene, 1952: 5 7
Stenopterygius quadriscissus; Hungerbuhler, 1994: 2 52
Stenopterygius quadriscissus; Godefroit, 1994: 41 [partim]
[non] Ichthyosaurus quadriscissus; Fraas, 1891: pi. 6, figs. 1-2
[non] Ichthyosaurus quadriscissus; Wiman, 1921: pi. 5, figs. 1-2
[non] Stenopterygius quadriscissus; Hauff, 1936: fig . 1
[non] Stenopterygius quadriscissus; Hauff, 1953: pis. 5, 9b
Stenopterygius megacephalus H uene; M aisch, 1998B: 406
Type material: Quenstedt (1856) made reference to seven
specimens, only one of which could be located by McGow