Agnostida

Lotagnostus americanus

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Agnostidae

Cambrian, Furongian Stage 10Zhejiang, Hunan, Hubei, Anhui, Xinjiang; Americas, Europe, Siberia
Lotagnostus americanus — photo 1
Photo 1 · GSC 859 (Canada; Peng et Illustrated specimens NIGP 23711、83022、62208、XTR T1489 (Peng et al., 2005) 1.8 cm (Zhejiang; Baishui) al., 2005) Complete dorsal First discovered pyritized shield (Xinjiang; enrolled specimen (Zhejiang; Guodong, Y.W, StrongZJU) Chengbei Baigong) Complete dorsal shields on a slab, largest 2 cm long Pyritized outstretched specimen, 8mm (Zhejiang; (Xinjiang; Guodong) Baishui)
Lotagnostus americanus — photo 2
Photo 2 · GSC 859 (Canada; Peng et Illustrated specimens NIGP 23711、83022、62208、XTR T1489 (Peng et al., 2005) 1.8 cm (Zhejiang; Baishui) al., 2005) Complete dorsal First discovered pyritized shield (Xinjiang; enrolled specimen (Zhejiang; Guodong, Y.W, StrongZJU) Chengbei Baigong) Complete dorsal shields on a slab, largest 2 cm long Pyritized outstretched specimen, 8mm (Zhejiang; (Xinjiang; Guodong) Baishui)
Lotagnostus americanus — photo 3
Photo 3 · GSC 859 (Canada; Peng et Illustrated specimens NIGP 23711、83022、62208、XTR T1489 (Peng et al., 2005) 1.8 cm (Zhejiang; Baishui) al., 2005) Complete dorsal First discovered pyritized shield (Xinjiang; enrolled specimen (Zhejiang; Guodong, Y.W, StrongZJU) Chengbei Baigong) Complete dorsal shields on a slab, largest 2 cm long Pyritized outstretched specimen, 8mm (Zhejiang; (Xinjiang; Guodong) Baishui)
Lotagnostus americanus — photo 4
Photo 4 · GSC 859 (Canada; Peng et Illustrated specimens NIGP 23711、83022、62208、XTR T1489 (Peng et al., 2005) 1.8 cm (Zhejiang; Baishui) al., 2005) Complete dorsal First discovered pyritized shield (Xinjiang; enrolled specimen (Zhejiang; Guodong, Y.W, StrongZJU) Chengbei Baigong) Complete dorsal shields on a slab, largest 2 cm long Pyritized outstretched specimen, 8mm (Zhejiang; (Xinjiang; Guodong) Baishui)
Lotagnostus americanus — photo 5
Photo 5 · GSC 859 (Canada; Peng et Illustrated specimens NIGP 23711、83022、62208、XTR T1489 (Peng et al., 2005) 1.8 cm (Zhejiang; Baishui) al., 2005) Complete dorsal First discovered pyritized shield (Xinjiang; enrolled specimen (Zhejiang; Guodong, Y.W, StrongZJU) Chengbei Baigong) Complete dorsal shields on a slab, largest 2 cm long Pyritized outstretched specimen, 8mm (Zhejiang; (Xinjiang; Guodong) Baishui)
Lotagnostus americanus — photo 6
Photo 6 · GSC 859 (Canada; Peng et Illustrated specimens NIGP 23711、83022、62208、XTR T1489 (Peng et al., 2005) 1.8 cm (Zhejiang; Baishui) al., 2005) Complete dorsal First discovered pyritized shield (Xinjiang; enrolled specimen (Zhejiang; Guodong, Y.W, StrongZJU) Chengbei Baigong) Complete dorsal shields on a slab, largest 2 cm long Pyritized outstretched specimen, 8mm (Zhejiang; (Xinjiang; Guodong) Baishui)
Lotagnostus americanus — photo 7
Photo 7 · GSC 859 (Canada; Peng et Illustrated specimens NIGP 23711、83022、62208、XTR T1489 (Peng et al., 2005) 1.8 cm (Zhejiang; Baishui) al., 2005) Complete dorsal First discovered pyritized shield (Xinjiang; enrolled specimen (Zhejiang; Guodong, Y.W, StrongZJU) Chengbei Baigong) Complete dorsal shields on a slab, largest 2 cm long Pyritized outstretched specimen, 8mm (Zhejiang; (Xinjiang; Guodong) Baishui)
Lotagnostus americanus — photo 8
Photo 8 · GSC 859 (Canada; Peng et Illustrated specimens NIGP 23711、83022、62208、XTR T1489 (Peng et al., 2005) 1.8 cm (Zhejiang; Baishui) al., 2005) Complete dorsal First discovered pyritized shield (Xinjiang; enrolled specimen (Zhejiang; Guodong, Y.W, StrongZJU) Chengbei Baigong) Complete dorsal shields on a slab, largest 2 cm long Pyritized outstretched specimen, 8mm (Zhejiang; (Xinjiang; Guodong) Baishui)
Lotagnostus americanus — photo 9
Photo 9 · GSC 859 (Canada; Peng et Illustrated specimens NIGP 23711、83022、62208、XTR T1489 (Peng et al., 2005) 1.8 cm (Zhejiang; Baishui) al., 2005) Complete dorsal First discovered pyritized shield (Xinjiang; enrolled specimen (Zhejiang; Guodong, Y.W, StrongZJU) Chengbei Baigong) Complete dorsal shields on a slab, largest 2 cm long Pyritized outstretched specimen, 8mm (Zhejiang; (Xinjiang; Guodong) Baishui)
Lotagnostus americanus — photo 10
Photo 10 · GSC 859 (Canada; Peng et Illustrated specimens NIGP 23711、83022、62208、XTR T1489 (Peng et al., 2005) 1.8 cm (Zhejiang; Baishui) al., 2005) Complete dorsal First discovered pyritized shield (Xinjiang; enrolled specimen (Zhejiang; Guodong, Y.W, StrongZJU) Chengbei Baigong) Complete dorsal shields on a slab, largest 2 cm long Pyritized outstretched specimen, 8mm (Zhejiang; (Xinjiang; Guodong) Baishui)
Lotagnostus americanus — photo 11
Photo 11 · GSC 859 (Canada; Peng et Illustrated specimens NIGP 23711、83022、62208、XTR T1489 (Peng et al., 2005) 1.8 cm (Zhejiang; Baishui) al., 2005) Complete dorsal First discovered pyritized shield (Xinjiang; enrolled specimen (Zhejiang; Guodong, Y.W, StrongZJU) Chengbei Baigong) Complete dorsal shields on a slab, largest 2 cm long Pyritized outstretched specimen, 8mm (Zhejiang; (Xinjiang; Guodong) Baishui)
Classification
Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Agnostidae
Genus
Lotagnostus Whitehouse, 1936
Genus author
Whitehouse F. W.
Genus etymology
lot, possibly derived from lotus (lotus flower)?; Agnostus, a trilobite genus name.
Species
L. americanus (Billings, 1860)
Species author
Billings E.
Species etymology
America, Americas
Age
Cambrian, Furongian Stage 10
Distribution
Zhejiang, Hunan, Hubei, Anhui, Xinjiang; Americas, Europe, Siberia
Synonyms
Agnostus americanus; Agnostus trisectus; Agnostus trisectus mut. ponepunctus; Lotagnostus punctatus; Lotagnostus asiaticus; Lotagnostus xinjiangensis; Lotagnostus(Lotagnostus)punctatus; Lotagnostus punctatus punctatus; Lotagnostus punctatus xinjiangensis; Lotagnostus trisectus; Goniagnostus verrucossus; Lotagnostus obscurus; Lotagnostus(Lotagnostus)trisectus; L. sanduensis
Diagnosis
Body often relatively large. Glabella divided into three segments, frontal segment nearly pentagonal, anterior part of posterior segment with a long median node; basal lobe large, triangular; cheek with irregular radiating furrows; Border wider in front, narrower behind. Thoracic axis similar in width to the glabellar base. Pygidium subcircular, posterior part rounded; axis broad, divided into three rings, first two rings with longitudinal axial nodes, posterior axial ring divided by a pair of shallow Longitudinal furrow divided into three parts, composed of two rows of elongate small pits; border furrow shallow and broad, with a pair of short marginal spines.
Remarks
This species is the type species of Lotagnostus, body length about 0.2-3 cm, an index fossil of Cambrian Stage 10. The enthusiast strongZJU first discovered a complete pyritized specimen.