"Posttornoceras ", type genus of the Posttornoceratinae was named by Wedekind in 1910 . " Posttornoceras " has a subglobular to discoidal shell with a small, closed umbilicus and biconvex growth lines ( Miller et al . 1964 ).
32.
The design used very thin wings of biconvex section proposed by Jakob Ackeret for conical shock wave generated by the nose of the aircraft . The fuselage had the minimum cross-section allowable around the centrifugal engine with fuel tanks in a saddle over the top.
33.
"' Thalassoceratoidea "', formerly "'Thalassocerataceae "', is a superfamily of Late Paleozoic ammonites characterized by their thick-discoidal to subglobular, involute shells with narrow or closed umbilici and biconvex growth striae with ventral sinuses.
34.
In 1895, the German scholar Hans Dragendorff produced a classification of vessel shapes in Roman red gloss pottery that is still used ( as e . g . " Drag . 27 " or " Dr . 27 " to refer to the small biconvex-profiled cup ).
35.
During testing the XF11C-3 had its wood-framed wing replaced by the metal-structured, biconvex, NACA 2212 airfoil wing, and soon after was redesignated "'XBF2C-1 "'( Model 67A ) in keeping with the new Bomber-Fighter category.
36.
""'Sigmoilina " "'ia a miliolid genus, referring to the foraminiferal order Miliolida, characterized by an assymmetricall biconvex test formed by strongly overlapping chambers, one-half coil in length, that form a sigmoid ( S-shaped ) curve in cross section.
37.
The generic name refers to Rinc�n de los Sauces, where the fossils were discovered, while the specific name, " caudamirus ", means " amazing in the tail " in Latin, in reference to the unusual shape of the tail vertebrae, especially a strange sequence of procoelous, amphicoelous, opisthocoelous, biconvex and ultimately again procoelous vertebrae shown by one individual.
38.
The spores have dimensions of ( 3.8 ) 4.9 5.5 ( 6.6 ) by ( 3.3 ) 4.4 5 ( 6.6 ) by 3.8 4.4 ?m, sublentiform ( shaped somewhat like a biconvex lens ) in face view or roughly elliptic in side view, with an inconspicuous hilar appendage.
39.
In addition, the most distal vertebrae develop a biconvex shape and together form a long, bony rod at the end of the tail, often referred to as a whiplash tail . Increased caudal count and a whiplash tail may be features shared by all members of the Diplodocoid group, but, due to a scarcity of evidence, this has yet to be proven.
40.
The forewings are white with a large trapezoidal brownish-ochreous patch occupying the disc from one-fourth to two-thirds, resting on the dorsum and extending three-fourths across the wing, the upper and lower margins broadly suffused grey, the anterior margin with a quadrate grey discal lobe reaching to near the base, a spot of grey suffusion above this towards the costa, the posterior margin biconvex.
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