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Information about Hyolitha

Hyolitha
Scientific classification
Kingdom:Animalia
Superphylum:Lophotrochozoa?
Phylum:Hyolitha
Hyolitha are enigmatic animals with small conical shells known from the Palaeozoic Era.

Shell morphology

The calcareous shells have a cover (operculum) and two curved supports known as helens. Most are one to four centimeters in length and are triangular or elliptical in cross section. Some species have rings or striations.

Taxonomy & ecology

Because hyoliths are extinct and do not obviously resemble any extant group, it is unclear who their closest relatives are. Some authors treat them as molluscs, but it is generally agreed that there is no very strong argument to do so. Fossil traces showing a twisted, looped, intestine bear some resemblance to the gut of sipunculan worms.

Despite the fact that hyolithid shells are quite common as fossils, next to nothing is known about their ancestry and internal structures. They were obviously benthic (bottom-dwellers), and there is some evidence that they were carnivores.

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Scientific classification or biological classification is a method by which biologists group and categorize species of organisms. Scientific classification also can be called scientific taxonomy, but should be distinguished from folk taxonomy, which lacks scientific basis.
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Lophotrochozoa

Phyla
  • Amiskwia (incertae sedis)
  • Nemertea
  • Phoronida
  • Bryozoa
  • Entoprocta
  • Brachiopoda
  • Sipuncula
  • Hyolitha †
  • Mollusca
  • Annelida
  • Echiura


The Lophotrochozoa
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In geometry, a (general) conical surface is the unbounded surface formed by the union of all the straight lines that pass through a fixed point — the apex or vertex — and any point of some fixed space curve — the directrix
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shell is a hard, rigid outer layer, which has evolved in a very wide variety of different animals, including mollusks, sea urchins, crustaceans, turtles and tortoises, armadillos, etc.
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The Paleozoic Era (from the Greek palaio, "old" and zoion, "animals", meaning "ancient life") is the earliest of three geologic eras of the Phanerozoic eon.
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Calcium carbonate is a chemical compound, with the chemical formula CaCO3. It is a common substance found as rock in all parts of the world, and is the main component of shells of marine organisms, snails, and eggshells.
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operculum (plural : opercula or operculums) of gastropods is a corneous or calcareous structure which exists in some families of snails, and which, in its most typical condition, fits perfectly into the opening or aperture of the shell.
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1 centimetre =
SI units
010−3 m 0 mm
US customary / Imperial units
010−3 ft 0 in
A centimetre (American spelling: centimeter, symbol cm
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striations are the tiny grooves of muscle across major muscle groups characteristic of a well-developed body. Chest striations are expected at low level competition, as they are indicative of muscularity and low body fat, whereas a "Christmas tree" in the lower back and striations
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Extant is a term commonly used to refer to taxa, species, genera or families that are still in existence (living). For example, Brandt's Cormorant is an extant species, while the Spectacled Cormorant is an extinct species.
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Mollusca
Linnaeus, 1758

Classes

Caudofoveata
Aplacophora
Polyplacophora
Monoplacophora
Bivalvia
Scaphopoda
Gastropoda
Cephalopoda
† Rostroconchia
† Helcionelloida
† ?Bellerophontida
The molluscs
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Sipuncula
Rafinesque, 1814

Classes, Orders and Families
  • Class Sipunculidea
  • Order Sipunculiformes
  • Family Sipunculidae

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For other uses of the term, see Fossil (disambiguation)


FOSSIL is a standard for allowing serial communication for telecommunications programs under the DOS operating system.
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carnivore (IPA: /ˈkɑrnɪvɔər/), meaning 'meat eater' (Latin carne meaning 'flesh' and vorare
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