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A NEW SPECIMEN OF THE TRIASSIC PISTOSAUROID YUNGUISAURUS, WITH IMPLICATIONS FOR THE ORIGIN OF PLESIOSAURIA (REPTILIA, SAUROPTERYGIA) by TAMAKI SATO, LI-JUN ZHAO, XIAO-CHUN WU and CHUN LI [Palaeontology, Vol. 57, Part 1, 2014, pp. 55–76] satochunlipalassauropyunguistriasspistosaurpala.12048.pdf " Revised diagnosis. Differing from known pistosauroids in the combination of the following characters: single interpterygoid vacuity with a narrow anterior extension, anterior extension of parasphenoid, at least six premaxillary teeth,elongate snout with slender teeth, pineal foramen reachingfrontal/parietal suture, nasal present, longitudinal ridge on temporal bar, sharp parietal crest, lack of squamosal bulbat posterior end of skull table, long mandibular symphysis,prominent coronoid process, constriction of snout and mandible (in adult individuals), about 50 cervical vertebrae with short neural arch and accessory articulation (zygosphene/zygantrum), rod-shaped chevrons not united medially, sickle-shaped clavicle, small scapula withoutventral plate, dorsal process of scapula slightly widen,absence of interglenoidal thickening of coracoids, semicircular pubis, long shaft of ilium, slender humerus and epipodials, hourglass-shaped ulna, at least 11 carpals and 8 tarsals (in adult individuals), hyperphalangy in manus"
I bought an articulated microscope arm a few years ago, but I was never really happy with it. The arm was too wobbly - the parts did not fit exactly and had too much play. While preparing I had to avoid bumping into the microscope, otherwise the microscope started to swing up and down. Now I have built myself a very sturdy double arm boom stand. I used two 16mm ball-type linear bearings and two solid linear motion shafts (16mm diameter, 80cm long). The end pieces and the support are made of aluminium - I had the holes drilled by a local company for 15 dollars. Together, it cost me about $ 90. Works fine! You can buy double-arm boom stands for about $ 200, but the arms are too short for my purposes.