Seahorse
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A seahorse is any of 46 species of small marine bony fish in the genus Hippocampus. "Hippocampus" comes from the Ancient Greek hippókampos (ἱππόκαμπος), itself from híppos (ἵππος) meaning "horse" and kámpos (κάμπος) meaning "sea monster" or "sea animal". Having a head and neck suggestive of a horse, seahorses also feature segmented bony armour, an upright posture and a curled prehensile tail. Along with the pipefishes and seadragons they form the family Syngnathidae.
Spiny seahorse H. histrix from East Timor holding on to soft coral with its prehensile tail
H. jayakari
Seahorses in Phase 2 of courtship
Ovipositor
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The ovipositor is a tube-like organ used by some animals, especially insects, for the laying of eggs. In insects, an ovipositor consists of a maximum of three pairs of appendages. The details and morphology of the ovipositor vary, but typically its form is adapted to functions such as preparing a place for the egg, transmitting the egg, and then placing it properly. For most insects, the organ is used merely to attach the egg to some surface, but for many parasitic species, it is a piercing organ as well.
Ovipositor of long-horned grasshopper (the two cerci are also visible)
The process of oviposition in Dolichomitus imperator: 1. Tapping with her antennae, the wasp listens for the vibrations that indicate a host is present 2. With the longer ovipositor, the wasp drills a hole through the bark 3. The wasp inserts the ovipositor into the cavity which contains the host larva 4. Making corrections 5-6. Depositing the eggs
A female fly in the family Tephritidae, with the ovipositor retracted and only the scape showing.
Ovipositing Mexican fruit flies showing the scapes of the extended ovipositors.