Henningsmoenicaris

Henningsmoenicaris Temporal range:
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
(unranked):	Panarthropoda
(unranked):	Tactopoda
Phylum:	Arthropoda
Genus:	†Henningsmoenicaris Müller and Waloszek, 1990
Species:	†H. scutula
Binomial name
†Henningsmoenicaris scutula (Müller & Waloszek, 1990)

Henningsmoenicaris scutula is a Cambrian genus of arthropod from the Orsten of Sweden. It was formerly named Henningsmoenia, however this name was preoccupied by an ostracod, therefore it was renamed. Its genus name translates to "Henningsmoen's shrimp" after G. Henningsmoen. The species name, scutula is in reference to the large, bowl-shaped carapace.

Morphology

Henningsmoenicaris unusually had an almost 360° field of vision, with two extremely long stalked eyes facing in almost all directions at once, even inwards to give depth perception to the opposite eye. Aside from this, it is a relatively "ordinary" Orsten arthropod with a large bowl-shaped head shield, five pairs of differentiated head appendages including antennules used for swimming, a three-segmented thorax with a pair of appendages on each segment (alongside a ninth pair seemingly still developing in the most developed complete specimen), a five-spined tail segment and a hypostome on the head. The most developed complete fossil is roughly 550 micrometers long, however a trunk fragment of a much larger and more developed specimen suggests even this form is a larva.