Podial issues try known as if the long axes was dependent anteroposteriorly

To possess non-podial limb girdle issues and you can enough time bones, directional terms and conditions was used as though the latest enough time axes of the elements were established dorsoventrally, so the surfaces that always face anteriorly try described due to the fact “anterior” while the counters that usually deal with posteriorly is actually referred to as “posterior”; proximal and distal are thus equivalent to dorsal and you may ventral, correspondingly.

5.eight.step 1 Scapula

PEFO 34561 saves a complete right scapula (Numbers 9a, b) and more than of one’s remaining scapula, aforementioned missing the dorsal apex. The scapula and you can coracoid within the Roentgen. callenderi (elizabeth.grams., PEFO 33789, PEFO 36875) have been discovered coossified independent off proportions; however, the scapulae and you can coracoids of PEFO 34561 was separate aspects (Rates 9a, b). If glenoid of scapula and you will coracoids is actually joint, the brand new glenoid are mainly based posteroventrally having a lateral parts in that way out-of phytosaurs and you may aetosaurs (A lot of time & Murry, 1995 ).

The posteroventrally founded glenoid rim of scapula is actually somewhat quicker than the counterpart of one’s coracoid and you will programs shorter posteriorly. From inside the ventral examine, the area of glenoid is roughly hemispherical and you will programs posterolaterally. The fresh new coracoid articulation try comma-designed when you look at the proximal take a look at, into greater a portion of the “comma” becoming deflected medially and you can abutting the new glenoid, while the newest slim, mediolaterally compacted area of the comma extends anteriorly. The latest slim an element of the coracoid articulation models the brand new ventral margin of a beneficial mediolaterally compressed anterior techniques, that makes up that-last of your dorsoventral amount of the fresh prior edge of the brand new scapula. Brand new dorsal side of the acromion processes was raised laterally away from all of those other scapula and hills anteroventrally regarding the anterior edge of the newest shaft. For the A great. mississippiensis, this place is the source of your Meters. deltoideus scapularis inferior (Brochu, 1992 ).

New shaft of the scapular blade was mediolaterally compacted and teardrop-molded in the cross-section, with a tapered prior border. Two-thirds the length towards the dorsal avoid this new axle this new element slowly begins to expand anteroposteriorly into the a pointed, posterodorsal apex (Numbers 9a, b) as with certain aetosaurs (age.grams., Letter. engaeus, PVL 3525). The new dorsal edge of the new scapula is actually dorsally convex during the horizontal glance at. Good “kink” towards rear edge of the latest scapula is the origin out of new Yards. thoraciscapularis superficialis during the An excellent. mississippiensis (Brochu, 1992 ). R. callenderi lacks the brand new rip-drop formed well-known tuber found on the posterolateral boundary merely dorsal with the glenoid, a nature contained in certain aetosaurs (e.grams., L. meadei, TMM 31185-97) and Batrachotomus kuperfezellensis (SMNS 80271; Nesbitt, 2011 ), but there’s an obvious homologous muscle bbwdesire, kimin seni Г¶deymeden sevdiДџini nasД±l gГ¶rГјrsГјn? mark in the same location (Shape 9a).

5.seven.dos Coracoid

The right coracoid regarding PEFO 34561 is done (Numbers 9a, b). The fresh posterolaterally depending glenoid rim is the thickest area of the coracoid. The fresh new scapula articulation into the coracoid decorative mirrors the latest coracoid articulation to your this new scapula, towards the thickest area being proximal next to the glenoid, together with prior a portion of the articulation getting mediolaterally compacted.

Posteroventral with the rim of your glenoid and you can across the posterior rim of your own coracoid, there clearly was a distinct notch splitting up the main human body of your own coracoid on glenoid fossa such as almost every other crown archosaurs (Nesbitt, 2011 ). The fresh new rear, ventral, and you may prior corners of one’s coracoid function a beneficial semicircular arch when you look at the horizontal evaluate, on the posterior margin getting somewhat heavy as compared to rest of that it border (= biceps tubercle; Profile 9a). Prior into the glenoid fossa, just ventral toward articulation for the scapula towards the lateral skin of your coracoid, are a lonely urban area where feature thins. Only prior to that particular despair is the coracoid foramen, which bases ventrolaterally through the feature. The latest medial facial skin of your coracoid are amazingly concave. The latest coracoid didn’t have an enthusiastic elongated postglenoid processes like in crocodylomorphs, but is deeper, far more exactly like most other suchians, specifically aetosaurs (e.grams., S. robertsoni, Walker, 1961 ). There is no strong groove to your posteroventral boundary as with loricatans eg P. kirkpatricki (elizabeth.grams., TTU P-9000) and you may D. grallator (NCSM 13733).

Schreibe einen Kommentar