Doublatia Wass & Banks 1971

Vanderlaan, Tegan A. & Ebach, Malte C., 2015, A review of the Carboniferous and Permian trilobites of Australia, Zootaxa 3926 (1), pp. 1-56 : 42

Genus Doublatia Wass & Banks 1971

1971 Doublatia Wass & Banks ; p. 227. 1978 Doublatia ; Engel & Laurie, p. 51.

Type species. Doublatia inflata Wass & Banks 1971 .

Emended diagnosis. Cephalon semicircular to parabolic in outline with narrow border; glabellar furrows S2 and S3 weakly developed; lateral preoccipital lobes and occipital ring strongly developed; palpebral region opposite posterior half of the glabella; short genal spines. Nine thoracic segments. Pygidium with axis only twothirds of the pygidial length; 8–9 axial rings, fewer pleural ribs than axial rings; no pygidial border; wide doublure. Surface finely granulose.

Remarks. Doublatia was diagnosed as having a strongly inflated glabella with a median preoccipital lobe. However, recently discovered specimens of the type species, D. inflata , show that it does not have a vaulted glabella or a median preoccipital lobe. The diagnosis of Doublatia has been emended to take this into account.

Doublatia was originally placed within the subfamily Griffithidinae by Wass & Banks (1971), but was moved to Ditomopyginae by Engel & Laurie (1978) based on its similarities to Ditomopyge , and the fact that it lacks a highly vaulted glabella characteristic of Griffithidinae. Owens (1983) placed Doublatia within Weaniinae , which was followed by Engel & Morris (1989) and herein.

Species included. Doublatia inflata Wass & Banks 1971 , Doublatia pyriforme Wass & Banks 1971 , Doublatia matheri Engel & Laurie 1978 .

Age and distribution. Sakmarian to Wordian (Early to Middle Permian) in Australia (Wass & Banks 1971; Engel & Laurie 1978; Percival et al. 2012).