Arianagnathus, Männik & Miller & Hairapetian, 2015

Männik, Peep, Miller, C. Giles & Hairapetian, Vachik, 2015, A new early Silurian prioniodontid conodont with three P elements from Iran and associated species, Acta Palaeontologica Polonica 60 (3), pp. 733-746 : 736-738

Genus Arianagnathus nov.

Etymology: After Ariana , older Latinized geographical name of the eastern part of the country from which the type material originated.

Type species: Arianagnathus jafariani sp. nov., by monotypy; see below.

Diagnosis.—An apparatus consisting of at least 14 paired elements: Pa, Pb, Pc, M, Sc, Sb 1, Sb 2, and a single symmetrical Sa element . Pa, Pb, and M elements are diagnostic: Pa element pastiniscaphate, thin-walled and broad-based with short posterior process bearing low, broad denticles, anterior

Fig. 3. Prioniodontid conodont Arianagnathus jafariani gen. et sp. nov from Llandovery (Silurian) of Derenjal Mountains, East Central Iran, Hill B → sample S19). A–D. Pa elements. A. Sinistral element, NHMUK PM X 3623, in upper (A 1), inner lateral (A 2), outer lateral (A 3), and lower (A 4) views. B. Dextral element, NHMUK PM X 3603, in outer lateral (B 1), upper (B 2), inner lateral (B 3), and lower (B 4) views. C. Dextral element, NHMUK PM X 3624, in upper (C 1), inner lateral (C 2), lower (C 3), and outer lateral (C 4) views. D. Sinistral element, NHMUK PM X 3625, in inner lateral (D 1), lower (D 2), outer lateral (D 3), and upper (D 4) views. E–I. Pb elements. E. Dextral element, NHMUK PM X 3626, in inner lateral (E 1), upper (E 2), lower (E 3), outer lateral E 4), and posterior (E 5) views. F. Dextral element, NHMUK PM X 3604, in upper (F 1) and lower (F 2) views. G. Dextral element, NHMUK PM X 3627, in outer lateral (G 1) and upper (G 2) views. H.?Sinistral element, NHMUK PM X 3628, in lower (H 1) and upper (H 2) views (posterior process preserved).. Dextral element, NHMUK PM X 3629, in upper view. Scale bars 0.1 mm.

process long with low denticles that thicken perpendicular to the blade to form short ridges of icriodelliform aspect that widen towards termination of process. Pb element pastiniscaphate, sub-triangular to quadrangular in upper view with widely opened deep basal cavity. Three main processes bearing rows of low denticles with the main denticle row arranged sigmoidally, also with short ridges of icriodelliform aspect perpendicular to the blade that are better developed distally. M element dolabrate with short anticusp and denticulate posterior process, on which denticle at the base of the cusp partly overlaps it.

Stratigraphic and geographic range.—Telychian (Llandovery, Silurian); Iran.