Odontopleurida

Odontopleura (Sinespinaspis) markhami

Order Odontopleurida / Family Odontopleuridae

Telychian (Llandovery, Silurian)Australia
Odontopleura (Sinespinaspis) markhami — photo 1
Photo 1 · (Sinespinaspis)) Adrain & Chatterton, 1990 In honour of Dr Neville Markham, director of the Geological Survey of New South Wales, in recognition of his Holotype: A, AM F117001, latex cast of the external mould; B, AM F117002, internal mould (Australia; Edgecombe et al., 2001) Restoration (Bicknell et al., 2022) (Australia; Edgecombe et al., 2001) Specimen with abnormal pleural spines (Australia; Bicknell et al., 2022)
Odontopleura (Sinespinaspis) markhami — photo 2
Photo 2 · (Sinespinaspis)) Adrain & Chatterton, 1990 In honour of Dr Neville Markham, director of the Geological Survey of New South Wales, in recognition of his Holotype: A, AM F117001, latex cast of the external mould; B, AM F117002, internal mould (Australia; Edgecombe et al., 2001) Restoration (Bicknell et al., 2022) (Australia; Edgecombe et al., 2001) Specimen with abnormal pleural spines (Australia; Bicknell et al., 2022)
Odontopleura (Sinespinaspis) markhami — photo 3
Photo 3 · (Sinespinaspis)) Adrain & Chatterton, 1990 In honour of Dr Neville Markham, director of the Geological Survey of New South Wales, in recognition of his Holotype: A, AM F117001, latex cast of the external mould; B, AM F117002, internal mould (Australia; Edgecombe et al., 2001) Restoration (Bicknell et al., 2022) (Australia; Edgecombe et al., 2001) Specimen with abnormal pleural spines (Australia; Bicknell et al., 2022)
Odontopleura (Sinespinaspis) markhami — photo 4
Photo 4 · (Sinespinaspis)) Adrain & Chatterton, 1990 In honour of Dr Neville Markham, director of the Geological Survey of New South Wales, in recognition of his Holotype: A, AM F117001, latex cast of the external mould; B, AM F117002, internal mould (Australia; Edgecombe et al., 2001) Restoration (Bicknell et al., 2022) (Australia; Edgecombe et al., 2001) Specimen with abnormal pleural spines (Australia; Bicknell et al., 2022)
Classification
Order Odontopleurida / Family Odontopleuridae
Genus
Odontopleura, subgenus Sinespinaspis (Odontopleura
Genus author
Adrain J. M. & Chatterton B. D. E.
Genus etymology
sine, Latin, without; spina, Latin, spine; -aspis, Greek, shield
Species
O. (S.) markhami Edgecombe & Sherwin, 2001
Species author
Edgecombe G. D. & Sherwin L.
Species etymology
gold exploration work in New South Wales, including the Forbes area.
Age
Telychian (Llandovery, Silurian)
Distribution
Australia
Diagnosis
Cranidium trapezoidal with dense nodes; three pairs of glabellar furrows and three pairs of lateral lobes; occipital ring with an occipital node and a pair of short backward-extending spines; palpebral lobes small, level with the mid-posterior part of L1; librigenal anterior marginal spines as small node-like projections, uniformly lengthening backward into short spines, genal spines slender and long. Thorax of 9 segments; axis narrow, each axial ring with a pair of short spines aligned with the occipital spines; each pleura with a pair of main spines, the anterior pleural spines gradually lengthening. Pygidium wide; axis of 2 rings; the pleural ridge extended from the first axial ring forming a large pleural spine backward, dividing the marginal spines into 4 outer pairs and 2 inner pairs.