Urstylis, Riehl & Wilson & Malyutina, 2014

Riehl, Torben, Wilson, George D. F. & Malyutina, Marina V., 2014, Urstylidae - a new family of abyssal isopods (Crustacea: Asellota) and its phylogenetic implications, Zoological Journal of the Linnean Society 170 (2), pp. 245-296 : 255-256

URSTYLIS GEN. NOV.

Zoobank registration urn:lsid:zoobank.org:act:E046CF0B-5DBA-4077-8C54-0F206467EE8C

Gender

The ending ‘-is’ is nominative singular feminine, as in Macrostylis .

Type species

Urstylis zapiola sp. nov., designated here.

Etymology

Based on the likely basal position of this genus to Macrostylidae and supposedly primitive character states, the Old High German prefix ‘Ur-’, meaning ‘thoroughly’ was chosen. It adds the meaning proto-, primitive, or original to nouns with which it is combined. This prefix was especially chosen in honour of Robert R. Hessler, who employed this prefix for naming ancestral character states or modelled ancestral species. The root ‘-stylis’ refers to the shape of the uropods that characterize species of Urstylis and the related Macrostylidae . It is based on the Greek ςτυλι´ς which is the complementary feminine form of ςτυλος (stylos; masculine), meaning column or pillar.

Composition

Urstylis zapiola sp. nov., U. solicopia sp. nov., U. thiotyntlus sp. nov.

Generic diagnosis

Pereon without sternal spines, not keeled. Pereonites 1–4 not tightly packed with anterior submarginal row of setae and lateral margin setose, posterolateral margin without prominent spine-like seta. Long setae on pedestal (uncalcified) articulations along lateral and anterior tergite margins. Pleotelson waist well pronounced, paired dorsal sensory organ present. Pereopod I positioned ventrally, orientated anteriorly, ischium dorsal lobe not longer than merus dorsal lobe.