Hyolitha
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Hyolitha

a class of extinct animals conventionally assigned to the phylum Mollusca. (Some scientists classify the animals as an independent phylum.) The Hyolitha lived from the beginning of the Cambrian to the Permian. The conical or pyramidal shell ranged from 0.1 to 15 cm in length and was sealed at the narrow end. The stoma of the shell closed with an operculum. In most species the dorsal and ventral sides of the shell were highly sculptured. In many the shell cavity was divided by transverse septa into a number of air chambers and one dwelling chamber. Some scientists believe that the shell was bivalved, that is, it consisted of conical and flat valves. The wall of the shell is calcareous and two-layered. Some species had a pair of long slender appendages departing from the stoma. The Hyolitha lived in the sea. They are very important in the stratigraphy of Cambrian deposits.

REFERENCE

Drushchits, V. V. Paleontologiia bespozvonochnykh. Moscow, 1974.

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No references found			Hymenoptera hymenopterous Hymenostomatida hymenotomy Hymes, Dell Hymettus hymexazol Hymn hymn board hymnal hymnody hymnology Hyndman, Henry M Hyndman, Henry Mayers Hyner Run State Park Hyner View State Park Hynobiidae hyobranchium Hyocephalidae hyoglossus Hyogo hyoid Hyoid Apparatus Hyoid Arch hyoid tooth Hyolith Hyolitha hyomandibular hyomandibular cleft hyomandibular pouch Hyopssodontidae hyoscine hyoscyamine Hyoscyamus hyostylic Hyostyly hypabyssal rock hypacusia hypaethral hypaethron hypalgesia hypandrium Hypanis hypanthium hypantrum Hypatia Hypatia of Alexandria Hypatian Chronicle hypautomorphic hypaxial musculature hype			hyoid hyoid hyoid apparatus hyoid apparatus hyoid apparatus hyoid arch hyoid arch hyoid arch hyoid arch hyoid arch hyoid bone hyoid bone hyoid bone hyoid bones hyoid bones hyoid bones hyoid muscles Hyoid Syndrome hyoid tooth hyoid triangle hyoid triangle hyoid triangle hyoid triangle Hyoid-Sternohyoid Interposition Graft Hyoideal Hyoideum Hyoideum hyoids hyoids hyoids Hyolith Hyolitha Hyolithes Hyomandibular Hyomandibular hyomandibular cleft hyomandibular pouch Hyomental Hyopastron Hyopssodontidae Hyoscamus niger Hyoscamus niger Hyoscamus niger hyoscine hyoscine hyoscine hyoscine hydrobromide Hyoscine N-Butyl Bromide hyoscyamine hyoscyamine hyoscyamine Hyoscyamine sulfate Hyoscyamine sulfate Hyoscyamine sulfate Hyoscyamos niger Hyoscyamos niger Hyoscyamos niger Hyoscyamus Hyoscyamus Hyoscyamus muticus Hyoscyamus niger

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Hyolitha (redirected from Hyolith)

REFERENCE

Hyolitha
(redirected from Hyolith)