Phacopida

Walliserops hammii

Order Phacopida / Suborder Phacopina / Superfamily Acastoidea / Family Acastidae / Subfamily Asteropyginae

Emsian (Early Devonian)Morocco
Walliserops hammii — photo 1
Photo 1 · for providing specimens; ops, Greek, eye McKellar R. Compared with the type species: specimens are generally smaller. The median furrow of the anterior glabellar lobe is indistinct; the trident spine divides close to the cranidium into three narrow, long, curved flat-pointed spines, the lateral two usually curving inward near their tips and even crossing each other; the occipital spine is stout. Thoracic axial spines start from the second segment. Holotype UA13446 (Morocco; Chatterton et al., 2006) Paratype UA13449 (Morocco; Chatterton et al., 2006) Complete dorsal exoskeleton (Morocco; Complete dorsal exoskeleton Mr. Heiyanquan) (Morocco; Guodong)
Walliserops hammii — photo 2
Photo 2 · for providing specimens; ops, Greek, eye McKellar R. Compared with the type species: specimens are generally smaller. The median furrow of the anterior glabellar lobe is indistinct; the trident spine divides close to the cranidium into three narrow, long, curved flat-pointed spines, the lateral two usually curving inward near their tips and even crossing each other; the occipital spine is stout. Thoracic axial spines start from the second segment. Holotype UA13446 (Morocco; Chatterton et al., 2006) Paratype UA13449 (Morocco; Chatterton et al., 2006) Complete dorsal exoskeleton (Morocco; Complete dorsal exoskeleton Mr. Heiyanquan) (Morocco; Guodong)
Walliserops hammii — photo 3
Photo 3 · for providing specimens; ops, Greek, eye McKellar R. Compared with the type species: specimens are generally smaller. The median furrow of the anterior glabellar lobe is indistinct; the trident spine divides close to the cranidium into three narrow, long, curved flat-pointed spines, the lateral two usually curving inward near their tips and even crossing each other; the occipital spine is stout. Thoracic axial spines start from the second segment. Holotype UA13446 (Morocco; Chatterton et al., 2006) Paratype UA13449 (Morocco; Chatterton et al., 2006) Complete dorsal exoskeleton (Morocco; Complete dorsal exoskeleton Mr. Heiyanquan) (Morocco; Guodong)
Walliserops hammii — photo 4
Photo 4 · for providing specimens; ops, Greek, eye McKellar R. Compared with the type species: specimens are generally smaller. The median furrow of the anterior glabellar lobe is indistinct; the trident spine divides close to the cranidium into three narrow, long, curved flat-pointed spines, the lateral two usually curving inward near their tips and even crossing each other; the occipital spine is stout. Thoracic axial spines start from the second segment. Holotype UA13446 (Morocco; Chatterton et al., 2006) Paratype UA13449 (Morocco; Chatterton et al., 2006) Complete dorsal exoskeleton (Morocco; Complete dorsal exoskeleton Mr. Heiyanquan) (Morocco; Guodong)
Classification
Order Phacopida / Suborder Phacopina / Superfamily Acastoidea / Family Acastidae / Subfamily Asteropyginae
Genus
Walliserops Morzadec, 2001
Genus author
Morzadec P.
Genus etymology
O. Walliser, professor at Göttingen University, in gratitude for his research on the Moroccan Devonian and
Species
W. hammii Chatterton, Fortey, Brett, Gibb & Chatterton B. D. E., Fortey R., Brett K., Gibb S. &
Species author
Author McKellar, 2006
Species etymology
Hammi, a person's name, Hammi Ait H'ssaine, a friend of the authors who provided great help in the research
Age
Emsian (Early Devonian)
Distribution
Morocco