Australimnadia Timms & Schwentner, 2012

Rogers, D. Christopher, 2020, Spinicaudata Catalogus (Crustacea: Branchiopoda)., Zoological Studies 59 (45), pp. 1-44 : 4-5

Australimnadia Timms & Schwentner, 2012

Diagnosis: (modified from Timms and Schwentner 2012 2017). Populations composed of males and hermaphrodites; amplexus has not been observed. Rostrum broadly triangular, with female rostrum more apically rounded. Angle between rostrum and frons from 90° to 100°. Occipital notch, occipital condyle absents. Frontal organ pedunculate, length 0.3–2.5x distance of organ from ocular tubercle. Carapace dorsal margin smooth, lacking carinae, hinge line arcuate. Umbone absent. Carapace unpigmented. Muscle scar circular, or angled 35° to 45° from normal, i.e., body horizontal axis. Clasper endopods bearing an apical suctorial organ. Endite IV with apical dense field of long spines. Female IX and X thoracopods with elongated exopod for egg attachment. Thoracic segments with a low medial protrusion or spines. Telsonic ventroposterior angle without spiniform projection. Telson posteriolateral spine rows confluent dorsally, confluence not projecting. Telson spine rows each with 20–25 spines. Telsonic spine rows heteromorphic between portions anterior and posterior of the caudal filaments. Caudal filaments inserted between the eighth and tenth spine pair, on a low or prominent mound. Cercopods sinuate to straight, with a proximal dorsomedial longitudinal row of plumose setae extending 50–80% of the cercopod, and a dorsal cirrus on the apical 10–20% of the cercopod.

Eggs double discoid or nearly double discoid with broad facets.

Comments: The type species is Australimnadia gigantea Timms & Schwenter, 2012 , a junior synonym of Limnadia grobbeni Daday, 1925: 160 , by original designation. The eggs of all three species are depicted in Timms and Schwentner (2017).

Attributed Species