Skip to main content
Fig. 8 | Swiss Journal of Palaeontology

Fig. 8

From: Balanocrinus and other crinoids from Late Jurassic mudstones of France and Switzerland

Fig. 8

Balanocrinus brachiospina n. sp., early Late Oxfordian, Savigna 2b. Secundibrachials, arm fragments and pinnulars. a Synostosial facet of high, asymmetric proximal brachial, note calcareous deposits, other facet muscular without pinnule socket, M11286. b Proximal, symmorphial facet, other side is muscular with pinnule socket, M11287. c Oblique view of distal, synostosial facet of skew brachial with twin thorns, proximal facet is muscular without pinnule socket, M11288. d Oblique view of proximal, synostosial facet of skew brachial with nipple, other facet is muscular with pinnule socket, M11289. e Distal, muscular facet of skew, aborally rounded brachial from proximal arm region with pinnule socket, other side is muscular, M11290. f Strongly asymmetric brachial from proximal arm region, M11291, f1 proximal facet, f2 oblique view of distal facet with pinnule socket. g Proximal facet of skew, asymmetric brachial, other side is synostosial (similar to d), M11292. h Proximal facet of extremely skew brachial, other facet is muscular with pinnule socket, M11293. i Distal facet of brachial with pinnule socket and long thorn, M11294. j Lateral view of brachial with thorn, pinnule socket at left, M11295. k Distal facet of brachial with pinnule socket and twin thorns, M11296. l Distal view of secondary axillary with thorn, other facet muscular, M11297. m Oblique adoral view of two proximal brachials joined by muscular facet, cirrus socket on lower brachial, straight sides with grooves indicate that arms were in contact laterally, synostosis at both ends; M11298. n Aboral view of two brachials with aboral keel and straight sides, joined by muscular facet, pinnule socket on lower (proximal) brachial, synostosis at both ends; M11299. o Aboral view of fragment of four brachials with thorn, all articulations muscular; M11300. p Aboral view of arm fragment with axillary (fifth brachial from below), all brachials with thorn, note synostosis on top (distal facet of tertibrachial 2); M11301. q Lateral view of arm fragment with thorned brachials and proximal pinnulars, holotype, M11302. r Lateral view of arm fragment with proximal pinnules, M11303. s Lateral view of three brachials, lowest brachial displaced, showing part of distal facet with exposed pinnule socket, M11304. t Oblique lateral-adoral-proximal view of pinnular, M11305. u Adoral view of pinnular with scars for cover plates, M11306. v Aboral view of proximal pinnular, M11342

Back to article page