''Analox'' Rasetti, 1966 is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

of Eodiscinid trilobites belonging to the family

Weymouthiidae The Weymouthiidae Kobayashi 1943 are an extinct family of eodiscinid agnostid trilobites. They lived during the late Lower Cambrian and earliest Middle Cambrian (Botomian to Delamaran) in the so-called ''Olenellus''- and ''Eokochaspis''-zon ...

Kobayashi T. (1943), Order Agnostida (Salter 1864) SALTER, J. W. 1864: On some new fossils from the Lingula-flags of Wales. ''Quarterly Journal of the Geological Society of London'', 20, 233–241. It lived during the Botomian stage. It can easily be distinguished from other trilobites by the two furrows that extend forwards and sidewards from the front of the glabella.

Distribution

''Analox bipunctata'' is known from the Lower Cambrian of the United States. ).Whittington, H. B. et al. Part O, Treatise on Invertebrate Paleontology. Revised, Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida. 1997 Type locality for ''Analox bipunctata'' is Rasetti's (1966) locality cs-4 in an unnamed limestone Formation which is exposed in several outcrops on a hill (Griswold Farm) about 1 mile southeast of North Chatham, Columbia County, New York State, USA; the faunule is referred to as the ''Acimetopus bilobatus'' faunule from one of the most common and characteristic trilobites.

Ecology

''A. bilobatus'' occurs in association with other Weymouthiidae (''

Acidiscus ''Acidiscus'' Rasetti, 1966, is a genus of Eodiscinid trilobite belonging to the family Weymouthiidae Kobayashi T. (1943), Order Agnostida Salter (1864). It lived during the Botomian stage = late Lower Cambrian Stage 4 (upper of two stages subdiv ...

'', '' Acimetopus'', '' Bathydiscus'', '' Bolboparia'', '' Leptochilodiscus'', '' Serrodiscus''), ''Calodiscus'', several species of ''

Olenellus ''Olenellus'' is an extinct genus of redlichiid trilobites, with species of average size (about long). It lived during the Botomian and Toyonian stages (''Olenellus''-zone), , in what is currently North-America, part of the palaeocontinent Lau ...

'' and ''Bonnia'' (Dorypygidae).

Description

Like all Agnostida, ''Analox'' is diminutive and the headshield (or

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) and tailshield (or

pygidium The pygidium (plural pygidia) is the posterior body part or shield of crustaceans and some other arthropods, such as insects and the extinct trilobites. In groups other than insects, it contains the anus and, in females, the ovipositor. It is compo ...

) are of approximately the same size (or isopygous) and outline. Like all Weymouthiidae, it lacks eyes and rupture lines (or sutures). The central raised area of the cephalon (or glabella) tapers forward and has a hardly discernible transverse furrow. Where the lateral portion of the furrow surrounding the glabella bends into the frontal portion, it meets left and right with the merged median and border furrows that extend more outwards than forwards, until these end in a pit some distance from the side. This is a very distinct character of ''Analox''. The large lobe behind this furrow (or L1), extends into a massive, broad based spine that points backward and upwards. The most backwards portion of the glabella, called occipital ring, is indistinct beneath the glabellar spine. The anterior border swollen medially, defined by the furrows running anterolaterally from axial furrow at front of glabella. There is no lateral cephalic border. The posterior border furrow fades out a little in front of genal angle. The pygidium has a long axis (of about eight rings). The pygidial border is narrow and defined by equally narrow border furrow.

References

Weymouthiidae Agnostida genera Cambrian trilobites of North America Animals described in 1966 Fossils of the United States {{agnostida-stub Cambrian genus extinctions