Limniphacos

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Limniphacos perspicullum
Temporal range: Late Atdabanian, 524–522  Ma
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Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Trilobita
Order:
Redlichiida
Suborder:
Olenellina
Superfamily:
Fallotaspoidea
Family:
Nevadiidae
Genus:
Limniphacos

Blaker & Peel, 1997
Species:
L. perspicullum
Binomial name
Limniphacos perspicullum
Blaker & Peel, 1997

Limniphacos is a genus of trilobites, a well known group of marine arthropods. The genus so far contains one species, L. perspicullum. [1]

A genus is a taxonomic rank used in the biological classification of living and fossil organisms, as well as viruses, in biology. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus.

Arthropod phylum of animals

An arthropod is an invertebrate animal having an exoskeleton, a segmented body, and paired jointed appendages. Arthropods form the phylum Euarthropoda, which includes insects, arachnids, myriapods, and crustaceans. The term Arthropoda as originally proposed refers to a proposed grouping of Euarthropods and the phylum Onychophora. Arthropods are characterized by their jointed limbs and cuticle made of chitin, often mineralised with calcium carbonate. The arthropod body plan consists of segments, each with a pair of appendages. The rigid cuticle inhibits growth, so arthropods replace it periodically by moulting. Arthopods are bilaterally symmetrical and their body possesses an external skeleton. Some species have wings.

Contents

Etymology

Limniphacos is derived from the Greek words limne (lake) and phakos (lens of the eye). [1]

Greek language language spoken in Greece, Cyprus and Southern Albania

Greek is an independent branch of the Indo-European family of languages, native to Greece, Cyprus and other parts of the Eastern Mediterranean and the Black Sea. It has the longest documented history of any living Indo-European language, spanning more than 3000 years of written records. Its writing system has been the Greek alphabet for the major part of its history; other systems, such as Linear B and the Cypriot syllabary, were used previously. The alphabet arose from the Phoenician script and was in turn the basis of the Latin, Cyrillic, Armenian, Coptic, Gothic, and many other writing systems.

Distribution

Earliest portion of the upper part of the Buen Formation, Brillesø, North of the Jørgen Brønlund Fjord, Southern Peary Land, Greenland. [1]

Buen Formation Geologic formation north of Greenland

The Buen Formation is a geologic formation in the north of Greenland. The shale preserves fossils dating back to the Early Cambrian period.

Ecology

Limniphacos perspiculum occurs together with Mesolenellus hyperborea , Serrodiscus, hyoliths, Petrianna fulmenta (Bradoriida), and inarticulate brachiopods. [1]

Mesolenellus is an extinct genus of trilobites that lived during the lower Cambrian (Botomian), found in Greenland and Spitsbergen.

Hyolitha

Hyoliths are animals with small conical shells, known as fossils from the Palaeozoic Era. They are lophophorates, a group which includes the brachiopods.

Bradoriids are small marine arthropods with a bivalved carapace, and were globally distributed, forming a significant portion of the Cambrian and early Ordovician soft-bodied communities.

Description

The raised central part of the head shield (or glabella) is conical (with a narrow front and a wide back), and has four or five pairs of furrows. It does not reach the border furrow with its front. The eye lobes are short and do not reach the most backward glabellar lobe. The headshield (or cephalon) carries four spines. Those closest to the axis (or intergenal spines) are short. The outer spines (or genal spines) are of moderate length and slightly in front of the back of the cehalon. The main body (or thorax) has at least 12 segments with prominent spines. All parts are reticulate and granularly ornamented. [1]

The cephalon is the head section of an arthropod. It is a tagma, i.e., a specialized grouping of arthropod segments. The word cephalon derives from the Greek κεφαλή (kephalē), meaning "head".

Habitat

Limniphacos species were probably marine bottom dwellers, like all Olenellina.

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References

  1. 1 2 3 4 5 Blaker, M.R.; Peel, J.S. (1997), "Lower Cambrian trilobites from North Greenland", Meddelelser om Grønland – Geoscience, 35


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