PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Kjaerina (Villasina) almadenensis

Strophomenata - Strophomenida - Rafinesquinidae

Taxonomy

Hedstroemina almadenensis was named by Villas (1995). Its type specimen is MPZ 11570, a shell, and it is a 3D body fossil. Its type locality is Al-1. Almaden, which is in a Berounian shoreface sandstone/shale in the Bancos Mixtos Formation of Spain.

It was recombined as Kjaerina (Villasina) almadenensis by Colmenar (2016).

Year	Name and author
1995	Hedstroemina almadenensis Villas pp. 81 - 82 figs. PI. 13, fig. 8-13
2016	Kjaerina (Villasina) almadenensis Colmenar pp. 300 - 304 figs. 5, 6

Reference	Diagnosis
E. Villas 1995	Species of Hedstroemina with multicostellate radial ornament, prominent rugae on posterolateral sides of disc, large chilidium higher than dorsal interarea, flabelliform deeply impressed ventral muscle field about one third as long as valve length, and strongly thickened cardinal process lobes.
J. Colmenar 2016	Species of Kjaerina (Villasina) with ventral valve disc moderately convex; trail inclined with respect to disc 110–120°. Dorsal valve disc concave; trail inclined with respect to disc about 120°. Radial ornament with 6–8 ribs per 2 mm at 10 mm anteromedially from umbo; prominent median riboccasionally present; regular and continuous development of rugae. Ventral muscle field well impressed, flabellate. Cardinal process lobes, triangular in young specimens and extremely engrossed in adult and gerontic ones; myophores with concave and striated posteroventral surface; notothyrial platform strong; median ridge wide and high; broad transmuscle septa longer than median ridge.