The skull of Hippocampus, the sea horse
New data has been recovered
for the skull of Hippocampus, the sea horse (Fig 1), based on Van Wassenbergh et al 2009.
Previously a neonate skull was employed
by the large reptile tree (LRT, 2221 taxa), which did not include ossified postorbital bones (= circumorbital series). In the adult the postorbital(s) (amber) are all anterior to the orbit.
Hippocampus heptagonus
(Rafinesque 1810; 4cm in length) is the extant seahorse, a fish that has transformed into a vertically oriented axis with a skull bent down on a sort of neck. Propulsion is slow, mainly from the small transparent dorsal fin.
BTW
the oarfish, Regalescus, (Fig 3) is still a giant sea horse in the LRT, sharing more traits than any competing taxa.
References
Van Wassenbergh S, et al (6 co-authors) 2009. Suction is kid’s play: extremely fast suction in newborn seahorses. Biology Letters 5: 200–203
Source: https://pterosaurheresies.wordpress.com/2023/02/21/the-skull-of-hippocampus-the-sea-horse/
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