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Encrinuroides regularis

Trilobita - Phacopida - Encrinuridae

Encrinuroides regularis was named by Pärnaste (2006) [= Krattaspis viridatus Öpik; Balashova 1966 p. 20, pl. 1, fig. 7 [non fig. 9, ?11, 12 (= K. viridatus); non fig. 10 (= indet.)]. = Encrinuroides Reed; Mägi, Viira and Aru 1989 p. 66. = 1990 Encrinuroides sp. nov.; Aru, p. 72.]. Its type specimen is GIT 389- 7 (t), a cephalon/head (an incomplete cranidium), and it is a 3D body fossil. Its type locality is Bed 3 Popovka section, which is in a Billingen shallow subtidal sandstone in the Leetse Formation of the Russian Federation.

Sister species lacking formal opinion data

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Synonymy list
YearName and author
2006Encrinuroides regularis Pärnaste pp. 161 - 165 figs. 3A–B, 5A–T, 6A–R

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EubilateriaAx 1987
phylumArthropodaLatreille 1829
classTrilobitaWalch 1771
orderPhacopidaSalter 1864
familyEncrinuridaeAngelin 1854
subfamilyEncrinurinaeAngelin 1854
genusEncrinuroidesReed 1931

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

H. Pärnaste 2006Exoskeleton with comparatively flat middle lobe, and low palpebral fixigena; anterior portion of cephalon and genal area abaxial from the eyes curve steeply downwards. Glabella with equal L1 and L2, and symmetrically developed glabellar tubercles: 1L)2L)3L)4L1 -1, 4L2 -2 and the second anterior border tubercle lie in one curved line. Anterior cranidial border deeply inclined medially, bearing six symmetrically distributed tubercles. Librigenal border straight, with no inflation, bearing a few very low tubercles at the axial furrow; the very shallow anterior border furrow hardly distinguishes it from the prematurely short LP with low inflation and a few tubercles, developed on the broadest area, i.e. laterally. Rostral suture concave. Prominent fixigenal circumocular tubercles in regular ring around eye. Pygidium with five pairs of pleurae extending to the posterior border and united sixth pair appears as a convex ‘loop’ behind the axial lobe. The axis shows 12 rings with paired small tubercles anteriorly and a low, lens-shaped ridge breaking the rearmost rings sagittally.