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Shiinoidae
Shiinoidae is a Family (biology), family of parasitism, parasitic copepods found on marine Teleost, teleosts. Description The family Shiinoidae consists of nine species of morphologically unusual copepods that parasitize marine teleosts. The body of shiinoids exhibits many cases of reduced segmentation and segmental fusions, including the complete loss of several appendages. Most strikingly, females in this family possess a pair of large antennae that are anteriorly directed and oppose a rostrum, which is formed from an outgrowth of cuticle between the antennules and can reach 30% of their body length. Together the antennae and the rostrum form a clasp that shiinoids use to attach to their teleost hosts, usually to gill-like tissue in the nostrils or, rarely, to the skin of their hosts. Genera and species The first species in the family to be described was ''Shiinoa occlusa'', a single immature female of which was discovered on the fish ''Narrow-barred Spanish mackerel, Scombe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Poecilostomatoida
Poecilostomatoida are an suborder of copepods. Although it was previously considered a separate order, recent research showed it to be nested within the Cyclopoida Description The classification of these copepods has been established on the basis of the structure of the mouth. In poecilostomatoids the mouth is represented by a transverse slit, partially covered by the overhanging labrum which resembles an upper lip. Although there is variability in the form of the mandible among poecilostomatoids, it can be generalized as being falcate (sickle-shaped). The antennules are frequently reduced in size and the antennae modified to terminate in small hooks or claws that are used in attachment to host organisms. Life cycle As with many crustaceans, larval development is metamorphic with immature forms differing greatly from those of adults. Embryos are carried in paired or single sacs attached to first abdominal somite (as seen in the illustration of the female '' Sapphirina darwinii ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
