Agnostida

Homagnostus obesus

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Agnostidae

Cambrian, Furongian PaibianShandong; UK, Sweden, Korea

Homagnostus obesus — photo 1 — Photo 1 · Lectotype (UK; Whittington et al., 1997) (UK; Whittington et al., 1997) (UK; Kennedy et al., 2018) (Sweden; Ahlberg et al., 2012) (Korea; Choi et al., 2004) (Shandong; Qian Yiyuan 1994)

Homagnostus obesus — photo 2 — Photo 2 · Lectotype (UK; Whittington et al., 1997) (UK; Whittington et al., 1997) (UK; Kennedy et al., 2018) (Sweden; Ahlberg et al., 2012) (Korea; Choi et al., 2004) (Shandong; Qian Yiyuan 1994)

Homagnostus obesus — photo 3 — Photo 3 · Lectotype (UK; Whittington et al., 1997) (UK; Whittington et al., 1997) (UK; Kennedy et al., 2018) (Sweden; Ahlberg et al., 2012) (Korea; Choi et al., 2004) (Shandong; Qian Yiyuan 1994)

Homagnostus obesus — photo 4 — Photo 4 · Lectotype (UK; Whittington et al., 1997) (UK; Whittington et al., 1997) (UK; Kennedy et al., 2018) (Sweden; Ahlberg et al., 2012) (Korea; Choi et al., 2004) (Shandong; Qian Yiyuan 1994)

Homagnostus obesus — photo 5 — Photo 5 · Lectotype (UK; Whittington et al., 1997) (UK; Whittington et al., 1997) (UK; Kennedy et al., 2018) (Sweden; Ahlberg et al., 2012) (Korea; Choi et al., 2004) (Shandong; Qian Yiyuan 1994)

Homagnostus obesus — photo 6 — Photo 6 · Lectotype (UK; Whittington et al., 1997) (UK; Whittington et al., 1997) (UK; Kennedy et al., 2018) (Sweden; Ahlberg et al., 2012) (Korea; Choi et al., 2004) (Shandong; Qian Yiyuan 1994)

Classification

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Agnostidae

Genus

Homagnostus Howell, 1935

Genus author

Howell B. F.

Genus etymology

hom, Greek, like, similar; Agnostus, a trilobite genus name.

Species

H. obesus (Belt, 1867)

Species author

Belt T.

Species etymology

obesus, fat, plump.

Age

Cambrian, Furongian Paibian

Distribution

Shandong; UK, Sweden, Korea

Synonyms

Agnostus pisiformis var. obesus; Agnostus tumidosus; Agnostus (Homagnostus) obesus; Homagnostus tumidosus; Homagnostus comptus; Homagnostus alaskensis; Homagnostus longiformis; Connagnostus lubricus

Diagnosis

Cephalon and pygidium almost round. Glabella cylindrical, divided into three segments; median node long, at the center of the posterior lobe; preglabellar median furrow distinct; basal lobe triangular; border furrow broad and deep; border narrow. Pygidial axis broad, divided into three rings, second ring with stout axial node, posterior axial ring large; border furrow broad and deep; border narrow; with a pair of small posterolateral spines.

Remarks

This species is the type species of Homagnostus.