-
mostly cyrtoconic as well as gyroconic, sepenticontic, and
sinstrally torticonic s**** with large,
typically straight necked (orthchoanitic) siphuncles...
-
largely abandoned Barrandeocerida.
Lechritrochoceratidae comprise dextrally torticonic genera with
costate s**** and
ventrally displaced siphuncles. Offset...
- Oxygonioceras,
named by Foeste, 1925, has a
loosely coiled,
dextrally torticonic s**** with a
rounded dorsum on the
inside of the
spiral and an angular...
- s**** are
exogastrically or
endogastrically breviconic, planospiral, or
torticonic;
often with a
constricted or
visored aperture; and a
siphuncle commonly...
- cephalopods,
primitively coiled but
later forms may be cyrtoconic, gyroconic,
torticonic, and even breviconic, all
having empty siphuncles with thin connecting...
