Tetraserica Ahrens 2004

Updated key to continental Southeast Asian species of Tetraserica Ahrens, 2004 (♂♂): 1 Species from Indochina or China ......................................................................... 2 - Species from Indian subcontinent...................................................................... 147 2 Posterior margin of metafemur with blunt tooth or sharp hook.................................................. 3 - Posterior margin of metafemur straight or slightly convex.................................................... 23 3 Posterior margin of metafemur with blunt tooth............................................................. 4 - Posterior margin of metafemur with sharp hook............................................................ 14 4 Left paramere long and narrow.......................................................................... 5 - Left paramere short and stout............................................................................ 9 5 Median lamina of phallobase as long or nearly as long as phallobase............................................. 6 - Median lamina of phallobase less than ¼ as long as phallobase. Left paramere long and filiform....................... 8 6 Left paramere as long as phallobase or longer, straight, not filiform.............................................. 7 - Left paramere nearly half as long as phallobase, curved externally, filiform................. T. vietnamensis (Frey, 1972) - Left paramere more than half as long as phallobase. Left paramere split shortly before apex into two filiform but flattened branches................................................... T. multiangulata Fabrizi, Dalstein & Ahrens, 2019 7 Right paramere split in two lobes........................................................................ 7a - Right paramere simple................................................................................ 7c 7a Blunt extension on the posterior margin of metafemur less distinct. Left paramere apically extremely widened......................................................................... elargata Ahrens, Pacholátko & Pham, sp. nov. - Blunt extension on the posterior margin of metafemur distinct. Left paramere apically not widened................... 7b 7b Mesodorsal margin of left paramere mesally extremely widened, with a large triangular extension on its (lateral view)................................................................... T. similis Ahrens, Pacholátko & Pham, sp. nov. - Mesodorsal margin of left paramere mesally not extremely widened but straight or slightly concave, without a large triangular extension on its (lateral view)............................. T. pingjiangensis Liu, Fabrizi, Bai, Yang & Ahrens, 2014 7c Left paramere simple, not split into two lobes.................. T. semipingjiangensis Fabrizi, Dalstein & Ahrens, 2019 - Left paramere split into two filiform lobes......................... T. konplong Ahrens, Pacholátko & Pham, sp. nov. 8 Right paramere shorter than phallobase, its dorsal lobe short and basally directed........... T. takahashii Kobayashi, 2017 - Right paramere as long as phallobase, its dorsal lobe long and distally directed.............................................................................................. T. phoupaneensis Fabrizi, Dalstein & Ahrens, 2019 9 Dorsal lobe of right paramere bearing spines. Median apical phallobasal lamina basolaterally strongly enlarged towards a lateral lamina as well................................................................... T. khemoi Ahrens, sp. nov. - Dorsal lobe of right paramere bearing no spines. Median apical phallobasal lamina basolaterally not enlarged........... 10 10 Dorsal lobe of right paramere short, not exceeding length of ventral one.............................................................................................. T. maoershanensis Liu, Fabrizi, Bai, Yang & Ahrens, 2014 - Dorsal lobe of right paramere longer, exceeding length of ventral one...................................................................................................... T. sculptilis Liu, Fabrizi, Bai, Yang & Ahrens, 2014 - Left paramere stout, dorsal margin bluntly angulate......................................................... 12 12 Dorsal lobe of right paramere evenly curved. Apex of left paramere abruptly narrowed at apex............................................................................. T. daqingshanica Liu, Fabrizi, Bai, Yang & Ahrens, 2014 - Dorsal lobe of right paramere in basal half wide and straight, in apical half curved. Apex of left paramere gently narrowed at apex............................................................................................... 13 13 Left paramere one quarter as wide as length of antennal club........... T. neouncinata Fabrizi, Dalstein & Ahrens, 2019 - Left paramere two thirds as wide as length of antennal club......... T. pseudouncinata Fabrizi, Dalstein & Ahrens, 2019 14 Metafemur basally not widened......................................................................... 15 - Metafemur basally strongly widened, sharp hook behind basal quarter of metafemur.............................. 14a 14a Dorsal and ventral lobe of left paramere of the same length. Left and right paramere of same length.......................................................................... T. pseudospinicrus Ahrens, Pacholátko & Pham, sp. nov. - Ventral lobe of left paramere longer than dorsal one. Left paramere longer than the right paramere................... 14b 14b Dorsal lobe of right paramere divided in two smaller lobes and small, less than a quarter as long as ventral lobe........................................................................................... T. spinicrus (Frey, 1972) - Dorsal lobe of right paramere simple (not divided in two smaller lobes) and large, almost half as long as ventral lobe....... ....................................................... T. paraspinicrus Ahrens, Pacholátko & Pham, sp. nov. 15 Sharp hook at basal third of metafemur................................................................... 16 - Sharp hook at middle of metafemur.................................................... T. hubleyi Ahrens, 2023 16 Eyes smaller, ratio diameter/interocular distance ≤ 0.59...................................................... 17 - Eyes larger, ratio diameter/interocular distance ≥0.63........................................................ 21 17 Left paramere with two branches........................................................................ 18 - Left paramere simple. Dorsal lobe of right paramere longer than the ventral one................................... 20 18 Left paramere split into a dorsal hook and a basal filiform branch. Dorsal lobe of right paramere much shorter than the ventral one............................................................................................... 19 - Left paramere split into two similar branches (lateral view). Dorsal lobe of right paramere longer than the ventral one........................................................................ T. lucai Fabrizi, Dalstein & Ahrens, 2019 19 Dorsal hook of smaller basal lobe of left paramere short. Basal lobe of right paramere small.Apical phallobasal lamina distinctly longer, distinctly exceeding dorsal lobe of left paramere............... T. kontumensis Fabrizi, Dalstein & Ahrens, 2019 - Dorsal hook of distinctly larger basal lobe of left paramere longer and strongly curved. Basal lobe of right paramere more robust. Apical phallobasal lamina distinctly shorter, not exceeding dorsal lobe of left paramere.......................................................................................... T. semikontumensis Pham & Ahrens, 2023 20 Dorsal lobe of right paramere strongly curved, large and directed distally, exceeding ventral lobe by far, at apex with a small additional hook.......................................... T. liangheensis Liu, Fabrizi, Bai, Yang & Ahrens, 2014 - Dorsal lobe of right paramere weakly curved, weakly exceeding ventral lobe, at apex without additional hook...................................................................... T. doisuthepensis Fabrizi, Dalstein & Ahrens, 2019 21 Median lamina of phallobase large and visible............................................................ 21a - Median lamina of phallobase reduced in size, much shorter in size than width of phallobase (in lateral view), usually not visible. Dorsal lobe of right paramere about as long as ventral one............... T. sonla Ahrens, Pacholátko & Pham, sp. nov. 21a Dorsal lobe of right paramere very small and bent basally................................................... 21b - Dorsal lobe of right paramere large and bent distally.......... T. guidosabatinellii Ahrens, Pacholátko & Pham, sp. nov. 21b Median lamina of phallobase evenly narrowed from base to apex, sharply pointed at apex. Basal portion of right paramere (lateral view) much wider than apical part.................... T. wandingensis Liu, Fabrizi, Bai, Yang & Ahrens, 2014 - Median lamina of phallobase wide, abruptly narrowed and rounded at apex. Basal portion of right paramere (lateral view) not wider than apical part................................................................................. 22 22 Right paramere strongly bent at middle (lateral view)............................ T. wiangpapaoana Kobayashi, 2017 - Right paramere weakly bent at middle (lateral view)................................ T. masumotoi Kobayashi, 2017 23 Median lamina of apical phallobase short, at maximum subequal to length of phallobase............................ 24 - Median lamina of apical phallobase long, at least slightly longer than phallobase.................................. 94 24 Median lamina of apical phallobase medium in length, at maximum subequal to length of phallobase.................. 25 - Median lamina of apical phallobase short, subequal t