Table 2 in Megabranchiella gen. nov., a new mayfly genus (Ephemeroptera, Baetidae) from Thailand with description of two new species

Table 2. Larval character comparisons of Megabranchiella gen. nov. and related genera.
CharactersAcentrellaLiebebiellaMegabranchiella gen. nov.BodyBody ventrally flattenedBody ventrally flattenedBody ventrally flattenedMouthpartCompact, the 2nd segment of labial palp with weakly developed inner lobe, the 3rd segment evenly rounded to slightly truncateCompact, the 2nd segment of labial palp with weakly developed inner lobe, the 3rd segment rounded, weakly tapered, or flattened apicallyCompact, the 2nd segment of labial palp with weakly developed inner lobe, the 3rd segment relatively roundedMaxillary palp2-segmented, terminal segment with or without apical tip2-segmented, terminal segment usually with apical tip2-segmented, terminal segment with apical tipHindwing padPresent, reduced or absentAbsentHighly reducedFemurDorsal margin of femur usually with a row of relatively long setaeDorsal margin of femur with relatively long, dense multiciliate setaeDorsal margin of femur with a regular row of long, simple setaeVentral femoral patchPresentPresentPresentTibiaDorsal margin of tibia with 1 or 2 regular rows of long, simple setaeDorsal margin of tibia usually with 1 or 2 rows of dense, long, multiciliate setaeDorsal margin of tibia with a row of long, simple setaeTarsusWithout a preapical setaWith a preapical setaWithout a preapical setaTarsal clawGenerally without subapical setae (presence in a few species)Without subapical setaeWithout subapical setaeAbdominal gillsUsually 7 pairs (8 pairs in A. joosti), dorsally oriented; gill margin smooth with a few scattered fine hair-like setaeSeven pairs, dorsally oriented; gill margin smooth with a few scattered fine hair-like setaeSeven pairs; gill I enlarged to cover sternites II-V, ventrally oriented, gill margin smooth without dense long fine hair-like setae; gill II-VII dorsally oriented, gill margin with dense long fine hair-like setaePosterior marginal spinesPoorly developed, often spiculate or multidentateWell developedReduced to absentParacercusGenerally reduced (sometimes to a segment)Reduced to a few segments (generally 10-14 segments)Reduced to a few segments (Approximately 12-15 segments)DistributionPalearctic, Nearctic and Oriental realmsOriental realmNorthern Thailand (Chiang Mai, Chiang Rai and Nan Provinces)ReferencesWaltz and McCafferty (1987); Sroka and Arnekleiv (2010); Kluge and Novikova (2011)Waltz and McCafferty (1987); Kluge and Novikova (2011); Kluge et al. (2013)Present study