Ptychopariida

Hypermecaspis armata

Order Ptychopariida / Suborder Olenina / Family Hypermecaspididae

Tremadocian (Early Ordovician)Argentina

Hypermecaspis armata — photo 1 — Photo 1 · Holotype CPBA 4700 (Argentina; Monti et al., 2022) Restoration (Harrington et al., 1957) Cranidium specimen (Argentina; Harrington et al., 1957)

Hypermecaspis armata — photo 2 — Photo 2 · Holotype CPBA 4700 (Argentina; Monti et al., 2022) Restoration (Harrington et al., 1957) Cranidium specimen (Argentina; Harrington et al., 1957)

Hypermecaspis armata — photo 3 — Photo 3 · Holotype CPBA 4700 (Argentina; Monti et al., 2022) Restoration (Harrington et al., 1957) Cranidium specimen (Argentina; Harrington et al., 1957)

Classification

Order Ptychopariida / Suborder Olenina / Family Hypermecaspididae

Genus

Hypermecaspis Harrington & Leanza, 1957

Genus author

Harrington H. J. & Leanza A. F.

Genus etymology

hyper-, Greek, excessive, elevated, beyond, above, outside; mec-, Greek, length, height; aspis, Greek, shield

Species

H. armata Harrington & Leanza, 1957

Species author

Harrington H. J. & Leanza A. F.

Species etymology

armata, armed, equipped

Age

Tremadocian (Early Ordovician)

Distribution

Argentina

Diagnosis

Compared with the type species Hypermecaspis inermis, this species has a small pointed median node on the occipital ring, a longer preglabellar field, longer palpebral lobes, genal angles extended into short spines, and a small pygidium.