Leptochilodiscus

Leptochilodiscus Rasetti, 1966 (p. 25, pl.1, fig. S ; pl. 11, figs 1-7) [= Kerberodiscus (Bassett et al., 1967, p. 632)] [2] is a genus of Lower Cambrian Eodiscinid trilobite belonging to the family Weymouthiidae Kobayashi T. (1943) [3] Order Agnostida (Salter 1864) [4] It lived during the Botomian stage = late Lower Cambrian Stage 4 (upper of two stages subdividing the un-named Series 2); the upper Botomian Stage boundary corresponds to base of both the Middle Cambrian Wuliuan stage and Miaolingian Series.

Leptochilodiscus
Temporal range: Botomian (Olenellus-zone)
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Trilobita
Order:
Agnostida
Suborder:
Eodiscina
Superfamily:
Eodiscoidea
Family:
Weymouthiidae
Genus:
Acidiscus

Rasetti, 1966
Type species
Acidiscus birdi
species
  • L. punctulatus Rasetti, 1966 [1]
  • Leptochilodiscus succinctus (Bassett et al., 1967).

Type species

Leptochilodiscus punctulatus Rasetti, 1966, from the Late Lower Cambrian of New York State. Holotype: U.S.N.M. 146009. Paratypes: U.S.N.M. 146010 and 146011.

Distribution

Leptochilodiscus punctulatus Rasetti (1966, p. 26, Pl. 1, fig. 5 ; pl. 11, figures 1 - 7; erroneously named Leptochilodiscus punctulatis [sic.]) is part of a trilobite faunule that was collected from limestone beds which form 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 bilohatus faunule after one of the most common and characteristic trilobites. The Acimetopus bilobatus faunule is notable for the number and variety of trilobites of the family Eodiscidae.

Leptochilodiscus succinctus (Bassett et al., 1967, p. 632, pl. 2, figs. 11 a - c) was collected from the upper part of the Hells Mouth Formation, 16.5 m below the base of the overlying Trwyn y Fulfran Formation at Trwyn Carreg-y-tir [Grid ref. SH 2876 2402]. The fauna is of late lower Cambrian age and falls within the upper part of the protolenid-strenuellid Zone [5] of the Comley Series of British nomenclature. L. succinctus was originally described by Basset et al., (op. cit.) as Kerberodiscus succinctus gen. et sp. nov.

References
  1. RASETTI, F. (1966). "New Lower Cambrian trilobite faunule from the Taconic sequence of New York". Smithsonian Miscellaneous Collections. 148 (9): 1–52.
  2. BASSETT M. G., OWENS R. M., and RUSHTON A. W. A. 1976. Lower Cambrian fossils from the Hell’s Mouth Grits, St Tudwal’s Peninsula, North Wales. Journal of the Geological Society, 132 (6): 623–644.
  3. KOBAYASHI T. 1943. Brief notes on the Eodiscids 1, their classification with a description of a new species and a new variety, Proceedings of the Imperial Academy, Tokyo, Volume 19, pp. 37-42.
  4. 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.
  5. COWIE, J. W., RUSHTON , A. W. A. & STUBBLEFIELD, C. J. 1972. A correlation of Cambrian rocks in the British Isles. Geological Society of London, Special Report no. 2, 40 pp,


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