Synonyms for bicarinate or Related words with bicarinate
Examples of "bicarinate"
Sageceras, type genus of the Sageceratidae, is described as having lenticular shells with flattened
venters and small umbilici. Sutures form numerous subequal auxiliary and adventitious lobes.
The whitish shell has a depressed turbinate shape. It is spirally costate,with the costae slightly tuberculate above. The suture is channeled. The outer lip is crenately varicose. The large umbilicus is
within and crenulately margined.
The scales on the forehead are much larger than those on the back of the head. No projecting triangular scales occur on the posterior border of the head. The gular scales are
The height of this conical-pyramidal, imperforate shell attains 11 mm. It is highly sculptured and conspicuously keeled around every whorl just above the suture. The body whorl at the periphery is
. The aperture is square-shaped.
Oppeliidae are compressed to oxyconic, sculptured Haplocerataceae, either unkeeled, unicarinate,
, or tricarinate; with sutures in great variety, but ribbing usually more or less falcoid or falcate. The Oppeliidae is the principal family of the Haplocerataceae, with the longest durantion, extending from the Middle Jurassic (Bajocian) to the Upper Cretaceous (Cenomanian) Their derivation is from the Hildocerataceae.
The diameter of the shell is 1.5 mm. The shell is narrowly umbilicated, with radiating low, broadly rounded undulations above, scalloping the periphery. The shell is quadricarinate in the adults,
in the young, the carinae being more acuate, sinuately dentate, and dotted with brown. The aperture is subcircular in the adult.
The teeth of "Rimasuchus" are robust and blunt, unlike those of other crocodiles. They become more bulbous toward the rear of the jaws. The crowns of the teeth are rarely sharp, although crown sharpness tends to lessen with size in crocodylians. The teeth are uniquely
, meaning that there are ridges on the front and back.
Ear-opening not or but slightly larger than the nostril; third to sixth upper labials below the eye. Dorsal scales sharply
; 24, rarely 26, scales round the middle of the body. Otherwise as in "R. rurkii". Reddish brown above, each dorsal scale usually with a dark brown dot; usually a rather indistinct darker lateral band; lower surfaces uniform whitish. From snout to vent .
Snout broadly rounded. Rostral small, but visible from above. Frontal longer than broad. Supraocular much larger than the eye, longer than the prefrontal. One elongated temporal, which is 2/3 or 3/5 the length of the parietal. Ventrals nearly two times as broad as the contiguous scales. Dorsal scales of the tail smooth or a few of the terminal ones weakly
or tricarinate. Terminal scute with a transverse ridge which is less distinct in females.
The height of the small, milky-white shell attains 6 mm, its width 2.25 mm. It has an ovate-fusiform shape. It contains 8 whorls. The body whorl is
. A very beautiful spirally carinate and lirate species. The short canal and wide sinus proclaim it rightly placed in "Microdrillia" and the acute carinae are peculiar. The aperture is oblique and oblong. The columella contains no plications.
, pearly shell has a conical shape. The 4½ whorls are gradate. The first 2 are yellowish, smooth, the following ones denuded-pearly. Beneath the suture the shell is sculptured with a series of nodules and smooth spiral lirae, few in number or evanescent. The body whorl contains elevated concentric lines on the base, stronger on the periphery, and radiating impressed lines. The aperture is rhomboid-rounded. The columellar margin is concave, thickened, below a little expanded, edentulous.
Head moderate. Body stout. Rostral as broad as deep. Nasals shorter than the frontal, more than twice as long as the suture between the prefrontals. Frontal longer than broad, as long as its distance from the end of the snout. One preocular and two postoculars. Two superposed anterior temporals. Seven or eight upper labials, third and fourth entering the eye. Only one pair of small chin shields. Ventrals distinguishable, but very small, either smooth or
The imperforate shell is ear-shaped and orbicularly depressed. The shell contains 3
whorls. The roughened body whorl is transversely lirate with unequal line. The interstices are longitudinally striated. The shell is pale above, with radiating reddish-brown flames at the sutures, below reddish dotted with brown. The base of the shell is ornamented with red radiating flames. The aperture is white and opaque within, with bright green lines. Its margin is pearly.
The imperforate, smooth and polished shell has a depressed, heliciform shape. Its color pattern is reddish, brown or yellow, usually flammulated above, variously marked below, with white. The spire is short and contains 5-6 whorls. The upper ones are
, the last often considerably descending, and rounded. The aperture is circular, oblique, and white within, rounded below. The wide columella is callous, and is excavated at the umbilical region.
The height of the yellowish-white shell reaches 1½ mm. The umbilicate shell has a turbinate-subdepressed shape. It is longitudinally and subobliquely striatulate. The short spire is obtuse; The spire consists of 3-3½ whorls. The first whorl is smooth, and separated by simple sutures. The remaining whorls are rather plane, lamellosely
above the middle, channelled between the carinae. The body whorl is subdescending, and is a little
The size of the conical shell attains 10 mm. The six whorls are covered with brown checkered spirals.The whorls are
but the body whorl is tricarinate. The base of the shell is polished and slightly convex. The large umbilicus is conical. The aperture is circular. The columella is barely reflected and ends at the keel of the umbilicus. The horny operculum shows granulate lines of growth.
The size of the shell varies between 16 mm and 31 mm. The rather solid shell has a conical shape. The apex is obtuse. The shell is profoundly umbilicated. Its color is white, ornamented with oblique black flammules. The six whorls show a coronal series of tubercles. They are carinated with a nodulose carina. They are channelled below the carina, and spirally bistriate. The body whorl is
. The base of the shell is concentrically sulcate. The aperture is subrhomboid, with its upper part smooth. The columella is arcuate; terminating in two teeth.
The shell grows to a length of 24 mm. The umbilicate, conical shell is solid. It is whitish, and maculated with purplish or yellowish. The six whorls are
at the periphery, all over spirally lirate. The upper surface is strongly radiately costate. The folds terminate at the periphery in short spines. The periphery is encircled by a channel bearing a median riblet. The base of the shell is convex, bearing 4 or 5 strong concentric lirae. The rounded aperture is smooth within. The columella is sinuous, arcuate, and dentate at the base. The umbilicus is moderate deep.
The size of the shell varies between 6 mm and 10 mm. The rather solid shell is imperforate but excavated at the place of the umbilicus. It has a depressed-conical shape. It is whitish, with numerous spiral bauds and lines of purplish-brown. The surface is very lightly obliquely striate, closely, densely finely spirally striate, generally with three strong carinae, one at periphery, the others above. The about 5 whorls are convex, those of the upper surface
. The convex body whorl is carinate or subcarinate. The oblique aperture is rounded-quadrangular. It is nacreous inside with slight sulci at the positions of the external carina. The columella is a little straightened.
Ear-opening larger than the nostril; a single azygos prefrontal, nearly as large as the frontonasal; fourth to sixth upper labials below the eye. Body much shorter than in the other species of the genus, the adpressed limbs meeting or slightly overlapping. Dorsal scales sharply
. 26 scales round the middle of the body. Reddish brown above, with or without 2 or 3 lighter dorsal streaks; sides with scattered minute whitish dots; usually a black blotch with a few white dots above the axilla; lower surfaces uniform whitish. From snout to vent .
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