Baikalolkhonia tatianae Naganawa, 1999

Rogers, D. Christopher, 2020, Spinicaudata Catalogus (Crustacea: Branchiopoda)., Zoological Studies 59 (45), pp. 1-44 : 29-30

Baikalolkhonia tatianae Naganawa, 1999 species inquirenda

Comments: Russia; Olkhon Island, Lake Baikal.

Males are unknown, and the specimens used in the description are reported to be immature ( Naganawa 1999). Types: ZMISU 960803-1.

Baikalolkhonia shmakini Naganawa in, Galazy & Naganawa, 2010 species inquirenda

Comments: Russia; Olkhon Island, Lake Baikal. Types: ZMISU 050801-1, -2. The fact that the first species described in the genus was based on juvenile material, and that both species come from the same island, suggests that this species might be a junior synonym of B. tatianae .

Leptestheriidae Daday, 1913a: 44 = Straskrabiidae Naganawa, 2001b , fide Rogers et al. 2020 = Sewellestheriidae Naganawa, 2001b

Diagnosis: (From Schwentner et al. 2020a) Cephalic fornices extending anteriorly to rostral apex. Rostrum variable, blunt to acute, long or short, generally triangular to subquadrate in lateral view. Rostrum with an apical spine (often broken off, look for scar). Compound eyes fused medially, sometimes projecting in smoothly arcuate ocular tubercle. Frontal organ sessile. Occipital notch present. Carapace thick, generally rounded. Carapace dorsal margin smooth, lacking carinae, hinge line straight. Carapace with or without pigmentation, growth lines obvious, projecting. Umbone present, projecting well above hinge line. Muscle scar rarely visible. Male first two thoracopods with endopod (sensu Olesen 2007) lacking an apical suctorial organ or modified tactile setae. Telson with or without a ventroposterior, posteriorly directed spiniform projection. Eggs 110–180 μm in diameter, spherical and generally lacking ornamentation.

Comments: The type genus is Leptestheria Sars, 1898a by designation ( Schwentner et al. 2020a). Three genera are recognised. Sars (1898a) was particularly taken with the form of the egg bearing epipodite extensions, but both he and far more so Daday (1913a b 1914 1924), emphasised the presence of the lamina epipoditalis as the defining character of the family. Yet traditionally, regional authors have been primarily separated the Leptestheriidae from the other families based on the presence of a rostral spine. However, some eocyzicids and cyzicid species posses a rostral spine.

A list of the Leptestheriidae was provided in part by García and Pereira (2003). Naganawa (2001b) created Sewellestheriidae for Sewellestheria , but his diagnostic characters are not exclusive, and the taxon is not accepted here.