Limnadopsis Spencer and Hall, 1896

Rogers, D. Christopher, 2020, Spinicaudata Catalogus (Crustacea: Branchiopoda)., Zoological Studies 59 (45), pp. 1-44 : 13-14

Limnadopsis Spencer and Hall, 1896

= Estheria Baird, 1860 (in part)

= Limnadiopsis nomen imperfectum fide Daday,

1925; Schneider and Sissom 1982 = Limnadiopsium Novojilov, 1958

Diagnosis: (modified from Rogers et al. 2012) Populations composed of males and females; male amplexes female on posterior carapace margin, keeping body in line, single file, behind female. Rostrum variable, blunt to acute, triangular or truncated, long or short, lacking apical spine. Angle between rostrum and frons 50° to 100°. Occipital notch and condyle absent. Frontal organ pedunculate. Frontal organ length 1.0 to 3.5 times distance between base of frontal organ and base of ocular tubercle. Carapace dorsal margin growth lines expanded dorsally into carinae or smooth. Carapace hinge line arcuate or straight. Carapace surface between growth lines smooth. Umbone typically present, rarely absent. Carapace with or without some pigmentation. Muscle scar angle ranges from 40 to 90 degrees from normal. Thoracic segments may have a dorsoposterior ridge or a dorsoposterior projection margined with spines or setae. Male first two thoracopods with endopod with scaliform setae, lacking a suctorial organ. Endite IV typical for family. Eggs attaching to prolonged exopods of thoracopods IV to XII, VI to XI, or IX, X and XI. Telson with or without a spiniform projection on ventroposterior angle anteriad of cercopod base. Telson posterior margin spine rows confluent dorsally, with confluence projecting dorsoposteriorly or with spines at confluence larger in diameter than subsequent spines. Each row averaging 22.3 spines. Caudal filament originating between spine rows at either third or fourth, or fourteenth and fifteenth spines from confluence. Cercopods arcuate, each medially with longitudinal setal row along proximal 30 to 70%. Setae plumose, simple or setaform spines, long or short. Setal row terminates in one to six spines. Cercopod with subapical, dorsal cirrus, extending 5 to 40% cercopod length. Eggs 150–200 μm in diameter, varying greatly in shape, with species specific morphology. Eggs with large polygonal depressions separated by ridges, occasionally with lamellar or setaform spines at polygon ridge line confluences ( Timms 2009a).

Comments: Important works on this genus include Timms (2009a), Weeks et al. (2009), and Schwentner et al. (2011). As in most limnadiid genera, the egg morphology is also species specific. The eggs are depicted in Timms (2009a) and Schwentner et al. (2012a b).

Attributed Species

Limnadopsis birchii ( Baird, 1860) sensu Timms, 2009a

= Estheria birchii Baird, 1860

= Estheria birchi Baird, 1860 nomen imperfectum

= Limnadopsis squirei Specner & Hall, 1896

= Limnadiopsis britchii nomen imperfectum Daday, 1925; Novojilov, 1958

Comments: Arid and semiarid inland Australia; not reported from Tasmania or Victoria. Baird’s types are missing, but Spencer and Hall’s types for L. squirei are available ( Timms 2009a). The eggs are figured in Timms (2009a).

Limnadopsis bloodwoodensis Schwentner, Timms, and Richter, 2012a

= Limnadopsis sp. ‘Roskos’ Schwentner et al., 2011

C o m m e n t s: A u s t r a l i a: N e w S o u t h Wa l e s,

Queensland.

Limnadopsis brevirostris Schwentner, Timms, and Richter, 2012a

= Limnadopsis sp. ‘Lagoon’ Schwentner et al., 2011

Comments: Known only from the type locality,

Queensland, Australia.

Limnadopsis centralensis Schwentner, Timms, and Richter, 2012a

Comments: Erldunda-Curtin Springs area south of

Alice Springs, Northern Territory, Australia.

Limnadopsis minuta Timms, 2009a

Comments: Known only from the type locality at Keep River National Park, Northern Territory, Australia. A surprisingly small species in this genus.

Limnadopsis multilineata Timms, 2009a

Comments: Australia: northern Western Australia.

Limnadopsis occidentalis Timms, 2009a

Comments: Australia: central Western Australia.

Limnadopsis paradoxa Timms, 2009a

Comments: Australia: New South Wales, South

Australia (one record in each), Western Australia (many records).