scansor, where the delimitation of the parasphenoid bone is more oval and continuous with the
basioccipital region.
The swim bladder with two anterior extensions extending forward to
basioccipital on both sides above auditory capsule; two posterior extensions extending into haemal funnel beyond posterior end of body cavity (the roots of two posterior extensions are non-adjacent and two posterior extensions are not well-knitted); a single duct-like process originating from ventral surface of swim bladder (between the roots of two posterior extensions) and reaching urogenital opening.
Field identifications were confirmed using the
basioccipital processes of voucher specimens (western silvery minnows have wider
basioccipitals than plains minnows Hybognathus placitus; Page and Burr, 1991; Cross and Collins, 1995).
The ossification is observed in the medial and posterior regions of the basal plate, which correspond to basisphenoid,
basioccipital and exoccipital.
La carilla articular anterior del centro vertebral que contacta con el
basioccipital se encuentra levemente comprimida en sentido dorsoventral y su diametro es mucho menor que el que exhibe la respectiva carilla articular posterior.
A hacksaw was used to cut through the
basioccipital and parasphenoid bones, stopping at the capsular otic bulla, the chamber containing the semicircular canals and otoliths.
A regiao do osso
basioccipital abriga o conspicuo condilo occipital (condylus occipitalis, CO: Figura 1D) e a rasa fossa subcondilar (fossa subcondylaris, FS: Figura 1D); e circundada por dois tuberculos basilares (tuberculum basilare), locais de origem da musculatura cervical.
Para determinar el sexo se observo la morfologia del hueso
basioccipital y se calculo un indice que tiene en cuenta la relacion longitud-ancho del mismo (Trouth et al.
Only small slivers of the opisthotic and the
basioccipital can be seen in the studied specimens (Fig.
Basisphenoid (Bas): articulated rostrally with the caudal edge of the pterygoid bone and caudally with the rostral edge of the
basioccipital (Figure 1C).
The basilar tubercle (TB, Figures 3, 4 and 1014) of the rostral portion of the
basioccipital region (B, Figure 10) has a moderately prominent crest-shape that is not prominent in Geococcyx (Figure 4).
Acridoidea is the largest superfamily within Orthoptera and contains about 11 extant families and about 7680 species, defined by the morphology of the male phallic complex and the lack of
basioccipital slit, among other characters (Roberts 1941, Amedegnato 1974, Kevan 1982).
