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Animal Classification

Larva of starfish is called

Asteroidean indirect development produces characteristic bipinnaria larva, free-swimming bilaterally symmetrical with preoral and postoral ciliated bands for locomotion and particle capture, complete gut with mouth and anus. Auricularia larva corresponds to Holothuroidea, echinopluteus with long calcareous rods to Echinoidea and ophiopluteus to Ophiuroidea, indicating class-specific larval morphology. Bipinnaria later develops brachiolar arms becoming brachiolaria larva which attaches before metamorphosis. Larval terminology provides taxonomic marker within Echinodermata, linking embryology to adult classification and illustrating enterocoelous deuterostome developmental pattern conserved across the phylum.

Ref: Hickman et al., Integrated Principles of Zoology, Chapter 21: Echinoderm Larvae; NCERT Class 11, Chapter 4

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Animal Classification

Respiratory structures in starfish are

Starfish respiration relies on papulae, also called dermal branchiae, numerous thin-walled outpocketings of coelom protruding between skeletal ossicles of aboral surface. Each papula consists of outer ciliated epidermis and inner coelomic lining with minimal barrier, highly vascularized for oxygen diffusion from seawater into coelomic fluid and hemal system. Papulae are retractable to avoid fouling and predation, supplemented by gas exchange across tube feet. Unlike tracheal tubes of insects, book lungs of arachnids or lamellate gills of fishes, papular respiration suits sessile benthic marine life with low metabolic demands.

Ref: NCERT Class 11 Biology, Chapter 4: Echinodermata; Hickman et al., Integrated Principles of Zoology, 17th ed., Chapter 21

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