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•  hamorii, the baseplate of the spermatheca is elliptical, rather than divided and subtriangular as in B.
•  smithi the baseplate of the spermatheca is divided and subtriangular, rather than elliptical as in B.
• They are 3-colplorate with a subtriangular amb, a small polar area, a long colpus, a lalongate endoaperture, a caveate exine and an echinate sexine.
• An anteroposteriorly short and dorsoventrally tall subtriangular pedal phalanx IV-1, with a narrow dorsal surface.
• It had a thorax composed of 13 segments with weak trilobation, a large subtriangular head terminating in an expanded rostral plate, a two-pronged hypostome, and a triangular pygidium.
• Forewing: costa and apex in some specimens broadly shaded with diffuse fuscous brown; the outer postdiscal brown line formed into a series of lunules that extend outwards slenderly along the veins and join the anteciliary brown line, thus enclosing in the interspaces a series of spots of the white ground colour, each of which is centred with a black or dark brown subtriangular spot.
• A very broad oblique discal orange band from costa to apices of interspaces 1 and 2, this orange band is sprinkled with bluish black scales; apical third of wing velvety purpurescent (purple) black; a hyaline (glass-like) transverse spot near middle of interspace 2, and a subtriangular similar small preapical spot.
• Cephalon slightly parabolic in outline with rounded or acute genal angles; genae convex, subcircular to subtriangular in outline; lateral borders wide.
• This is overlaid with a series of 17-26 dorsolateral suboval or subtriangular brown blotches that alternate or oppose each other middorsally.
• Diagnostic characters include subtriangular external nostrils with lateral borders, small orbits, posteriorly wide postfrontals, elongate parietals, concave posterior margin of the skull table, ovoid anterior palatal vacuities, posteriorly pointed choanae, and oval interpterygoid fenestrae.
• Trigonoceras has a very loosely coiled gyroconic or cyrtoconic shell with a subtriangular cross section, as indicated by fragmentary specimens.
• The maximum diameter is in the forward part of the phragmocone; the body chamber tapers slightly to a transverse, subtriangular aperture with a well-developed hyponomic sinus.
• Jovellaniidae was established as a family within the Oncocerida to include genera characterized by longiconic orthocones and cyrtocones with a subtriangular to depressed cross-section in which the ventral (siphuncular) side is typically angular or more acutely rounded than the dorsal (antisiphuncular) side, and in which the siphuncle is generally large, ventral, and with lamellar actinosiphonate deposits (Flower 1950, Sweet 1964).
• According to Rinderknecht et al (2010), Lestobradys was diagnosed under the autapomorphies; a combination of a first alveolus strongly projected toward the labial region that is separated from the rest of the alveoli of the dental series by a marked diastema, a subtriangular second alveolus, a subquadrangular third alveolus, and a bilobed last alveolus with a clearly defined isthmus separating both lobes.
• The ventrianal shield ranges from subtriangular to bullet-shaped, and bears 3-4 pairs of preanal setae and 3 circumanal setae.
• Valcouroceratids are characterized by exogastric cyrtocones and brevicones that change during the life span from compressed to depressed or subtriangular in cross section, and which have ventral siphuncles that are cyrtochoanitic and which contain lamellar actinosiphonate fillings.
• Forewings very narrow, obtuse; rather dark fuscous, pale-speckled; an obscure transverse whitish line almost at base; white transverse lines converging towards costa before and beyond 1/3, accompanied above by yellowish lines, similar more oblique pairs of lines meeting on costa beyond middle; between these are two darker fuscous suboval spots resting on costa partially edged by similar lines, and a third larger subtriangular blotch on costa about 2/3, some irregular light yellowish angulated markings beyond this; an obtusely angulated transverse bluish-silvery line towards apex, followed on costa by a yellowish mark and white dot; a large projecting tuft of dark fuscous scales from dorsum before middle, a smaller one beyond middle, and a third in cilia before tornus: cilia grey, at apex a dark fuscous hook.
• There is a subtriangular praetornal spot, a straight subapical fascia, and a triangular apical spot trifurcate on costa all ferruginous - brown more or less sprinkled with black.
• Halloceras is a gyroconic rutoceratid from the Lower Devonian of North America, with a subtriangular whorl section, narrow dorsum (on the inner side), divergent flanks, and broad, rounded venter (on the outer side), frills at various growth points, suture with shallow ventral and lateral lobes, and a small siphuncle near the venter.
• Somalirhynchia africana has medium sized shells subtriangular in outline, strongly dorsibiconvex with maximum width attained past midlength; beak erect and massive with small hypothyroid pedicle foramen; deltidial plates disjunct.

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