The most characteristic features of the belemnite rostra, which have been described by many authors after observations of both longitudinal and transversal sections (e.g., Muller-Stoll 1936, p.
SEM observations of fresh-cut sections of belemnite rostra
In the longitudinal sections of very well-preserved rostra, with no observable diagenetic alteration, it is noticeable that calcite crystals emerge radially from successive spherulitic centers of crystal growths that are situated along the apical line (Fig.
After etching in 25% glutardialdehyde, the same pattern of radially arranged crystals is observed in both longitudinal and transversal sections of the rostra; although the prismatic habit become less evident, the micro-fibrous texture is prominent and the concentric growth layering is enhanced (Fig.
Besides the RearSight system, Rostra
also produces the RearSentry obstacle sensing system for medium-and heavy-duty trucks and trailers; the ParkPilot parking aide, which uses ultrasonic technology to warn drivers when objects are detected as a vehicle backs into parking spots; the Rostra
Obstacle Sensing System (ROSS) that detects hidden objects; and the Student Detection System (SDS) for the school bus industry.
"Rostra UK is an exciting young company with a high quality, valuable service to offer sufferers of this painful disease.
He said that Rostra delivers a patient- focused service with the benefits of flexible costs and waiting list management, underpinned by strict clinical governance protocols and formal audit and quality assurance/improvement programmes.
The opportunity to develop the company to address the needs of sufferers was identified by Rostra UK's managing director, Ian Brown, who said: "Setting up Rostra is very exciting.
Identification of the skull is based on overall size and its possible attachment to one of the rostra (IGM 7888).
Discussion.--These bones are too fragmentary to be positively identified to genus, however, the rostra, pterygiophore, fin spines, and two predentaries are from fish of large size, a factor that favors their identification as belonging to the genus Makaira or Tetrapturus audax, and not to the genus Istiohorus nor to T.
Locality IG 95: two distal rostra, IGM 7882, 7884; proximal rostrum, IGM 7888; partial skull, IGM 7889.
Discussion.--All ratios (Table 1) computed for the above rostra are within the range of values observed for Recent M.