. Bulletin of the British Museum (Natural History) Zoology. 88 GORDON J. HOWES. Fig. 13 Macruronus magellanicus, suspensorium and palato-pterygoid series. Above, medial aspect (BMNH : 342-56, alcian-alizarin stained preparation); below, lateral view of palatine and ectopterygoid (: 358-63, skeleton). The suspensorial elements of Merluccius differ in several respects from those of Macruronus: Palatine is deeper posteriorly, bearing a shallow lateral depression for the origin of adductor mandibulae Alb; ectopterygoid not extending as far ventrally along quadrate border and not
. Bulletin of the British Museum (Natural History) Zoology. 88 GORDON J. HOWES. Fig. 13 Macruronus magellanicus, suspensorium and palato-pterygoid series. Above, medial aspect (BMNH : 342-56, alcian-alizarin stained preparation); below, lateral view of palatine and ectopterygoid (: 358-63, skeleton). The suspensorial elements of Merluccius differ in several respects from those of Macruronus: Palatine is deeper posteriorly, bearing a shallow lateral depression for the origin of adductor mandibulae Alb; ectopterygoid not extending as far ventrally along quadrate border and not posteriorly forked; entopterygoid not as extensive nor meeting meta- pterygoid (Inada, 1981:76); symplectic short and oblong; metapterygoid's posterior border extends further dorsally along hyomandibular limb; hyomandibular has deep cranial articulatory and long opercular processes. The most notable feature of the Merluccius hyomandibular, lacking in Macruronus, is a broad, lateral flange bearing two ventrally directed processes (Fig. 14A). Inada (1981) found significant enough differences in the size of the anterior (intermuscular) process to recognise two species groups of Merluccius. angular with a well-developed horizontal medial ridge. Subopercular broadly triangular with rounded borders contacting opercular and preopercular, overlapped exten- sively by latter. An interopercular-subopercular ligament is absent. Merluccius differs most noticeably from Macruronus in interopercular morphology (Figs 15B & 16C). The bone's anterior tip is blunter, its posterior border subtriangular and extended; dorsomedial articular surface highly developed with a thick rim acting as a stop to the posterior movement of the interhyal. Interopercular-preopercular ligament narrow, also a narrow interopercular-subopercular ligament. Sub- opercular oblong with straight posterior border contacting opercular with only narrow portion of anterior margin being overlapped by preopercular. Opercular w
Size: 1450px × 1722px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollection, bookpublisherlondonbutterworths
