Asaphida

Abulbaspis ordosensis

Order Asaphida / Superfamily Trinucleoidea / Family Raphiophoridae

Darriwilian (Middle Ordovician)Inner Mongolia
Abulbaspis ordosensis — photo 1
Photo 1 · Holotype (Inner Mongolia; Lu Yanhao et Literature specimen OCGM-Inv. 1541 (Inner Mongolia; Lee et al., al. 1976) 2016) (Inner Mongolia; (Inner Mongolia; 52 (Inner Mongolia; (Inner Mongolia; Haiku Shilan De Huashi) Baishui) Chongchong) Pengcheng Jianke) Nearly complete dorsal exoskeleton on the same slab as Ampyx gongwusuensis (Inner Mongolia; Haiyang Wangzi)
Abulbaspis ordosensis — photo 2
Photo 2 · Holotype (Inner Mongolia; Lu Yanhao et Literature specimen OCGM-Inv. 1541 (Inner Mongolia; Lee et al., al. 1976) 2016) (Inner Mongolia; (Inner Mongolia; 52 (Inner Mongolia; (Inner Mongolia; Haiku Shilan De Huashi) Baishui) Chongchong) Pengcheng Jianke) Nearly complete dorsal exoskeleton on the same slab as Ampyx gongwusuensis (Inner Mongolia; Haiyang Wangzi)
Abulbaspis ordosensis — photo 3
Photo 3 · Holotype (Inner Mongolia; Lu Yanhao et Literature specimen OCGM-Inv. 1541 (Inner Mongolia; Lee et al., al. 1976) 2016) (Inner Mongolia; (Inner Mongolia; 52 (Inner Mongolia; (Inner Mongolia; Haiku Shilan De Huashi) Baishui) Chongchong) Pengcheng Jianke) Nearly complete dorsal exoskeleton on the same slab as Ampyx gongwusuensis (Inner Mongolia; Haiyang Wangzi)
Abulbaspis ordosensis — photo 4
Photo 4 · Holotype (Inner Mongolia; Lu Yanhao et Literature specimen OCGM-Inv. 1541 (Inner Mongolia; Lee et al., al. 1976) 2016) (Inner Mongolia; (Inner Mongolia; 52 (Inner Mongolia; (Inner Mongolia; Haiku Shilan De Huashi) Baishui) Chongchong) Pengcheng Jianke) Nearly complete dorsal exoskeleton on the same slab as Ampyx gongwusuensis (Inner Mongolia; Haiyang Wangzi)
Abulbaspis ordosensis — photo 5
Photo 5 · Holotype (Inner Mongolia; Lu Yanhao et Literature specimen OCGM-Inv. 1541 (Inner Mongolia; Lee et al., al. 1976) 2016) (Inner Mongolia; (Inner Mongolia; 52 (Inner Mongolia; (Inner Mongolia; Haiku Shilan De Huashi) Baishui) Chongchong) Pengcheng Jianke) Nearly complete dorsal exoskeleton on the same slab as Ampyx gongwusuensis (Inner Mongolia; Haiyang Wangzi)
Abulbaspis ordosensis — photo 6
Photo 6 · Holotype (Inner Mongolia; Lu Yanhao et Literature specimen OCGM-Inv. 1541 (Inner Mongolia; Lee et al., al. 1976) 2016) (Inner Mongolia; (Inner Mongolia; 52 (Inner Mongolia; (Inner Mongolia; Haiku Shilan De Huashi) Baishui) Chongchong) Pengcheng Jianke) Nearly complete dorsal exoskeleton on the same slab as Ampyx gongwusuensis (Inner Mongolia; Haiyang Wangzi)
Abulbaspis ordosensis — photo 7
Photo 7 · Holotype (Inner Mongolia; Lu Yanhao et Literature specimen OCGM-Inv. 1541 (Inner Mongolia; Lee et al., al. 1976) 2016) (Inner Mongolia; (Inner Mongolia; 52 (Inner Mongolia; (Inner Mongolia; Haiku Shilan De Huashi) Baishui) Chongchong) Pengcheng Jianke) Nearly complete dorsal exoskeleton on the same slab as Ampyx gongwusuensis (Inner Mongolia; Haiyang Wangzi)
Classification
Order Asaphida / Superfamily Trinucleoidea / Family Raphiophoridae
Genus
Abulbaspis Zhou & Zhou, 2006
Genus author
Zhou Zhiyi, Zhou Zhiqiang
Genus etymology
a-, without, not; Bulbaspis, a trilobite genus name
Species
A. ordosensis (Lu in Lu et al., 1976)
Species author
Lu Yanhao
Species etymology
Ordos, Ordos, Inner Mongolia
Age
Darriwilian (Middle Ordovician)
Distribution
Inner Mongolia
Synonyms
Bulbaspis ordosensis
Diagnosis
Dorsal shield ovate. Cephalon subtriangular; glabella narrow and long, widening gradually forward, then converging rapidly, extending forward into a globular protuberance, in some individuals with a small spine in front of the globular protuberance; 3 pairs of glabellar furrows, S1 circular pit-like, extremely short and deep; occipital furrow straight, shallow and wide; occipital ring connected to the posterior border without the interruption of the dorsal furrows; fixigenae triangular, very wide; eyes absent. Thorax of 6 segments; axis about half the width of the pleural region; pleurae straight, segments 2 and 3 longest, shortening anteriorly and posteriorly, with flat ends and no pleural spines. Pygidium tri- angular; axis narrow, divided into 13-14 axial rings; pleural and interpleural furrows of the pleural region both extremely shallow; border narrow, sloping steeply downward-backward, outer margin slightly raised into a line-like narrow ridge.
Remarks
This species is the type species of the genus Abulbaspis.