Carlogonus, Demange, 1961

Sankaran, Pradeep M. & Sebastian, Pothalil A., 2020, A new species of Carlogonus Demange, 1961 from southern India (Spirostreptida Harpagophoridae, Harpagophorinae), with phylogenetic analysis and speciesgroup divisions in the genus, Zootaxa 4868 (1), pp. 27-40 : 29-30

Key to Carlogonus spp. based on male features

[Details of all Carlogonus spp. except C. gayathri sp. nov. are adopted from Attems (1936), Demange (1977a, b, 1981, 1983) and Carl (1941) ( Figs 7 A–H, 8A–H). Due to the unavailability of relevant character details, C. spinicaudus is omitted from the key].

1a Telopodite of gonopod bears single tibial spine ( exaratus -group)................................................ 2

1b Telopodite of gonopod bears paired tibial spines ( acifer -group)................................................. 6

2a Lateral margin of anterior coxal fold lacks spine-like outgrowth................................. C. gayathri sp. nov.

2b Lateral margin of anterior coxal fold bears spine-like outgrowth................................................ 3

3a Anterior spine-like outgrowth of lateral margin of anterior coxal fold long, mesal margin of tibia of telopodite with short conical process.................................................................................... C. robustior

3b Anterior spine-like outgrowth of lateral margin of anterior coxal fold short, mesal margin of tibia of telopodite without conical process............................................................................................. 4

4a Telopodite distally spiralled, internal fold of mesal margin of posterior coxal fold with anterior rectangular process.................................................................................................. C. subvalidus

4b Telopodite lacks distal spiral, internal fold of mesal margin of posterior coxal fold with anterior triangular process........ 5

5a Anterior coxal fold bears upwardly directed anterior process, mesal margin of anterior coxal fold bears anterior spine-like outgrowth, telopodite distally bears lateral and mesal triangular expansions................................. C. auriculus

5b Anterior coxal fold bears downwardly directed anterior process, mesal margin of anterior coxal fold lacks anterior spine-like outgrowth, telopodite lacks distal, lateral and mesal triangular expansions................................ C. exaratus

6a Anterior coxal fold with deep lateral indentation, tibial spines on telopodite equal in length................ C. chowdaiahi

6b Anterior coxal fold without deep lateral indentation, tibial spines on telopodite unequal in length...................... 7

7a Anterior coxal fold bears posterior spine-like outgrowth, anterior process of anterior coxal fold less developed, 1st tibial spine on telopodite short and acute...................................................................... C. acifer

7b Anterior coxal fold lacks posterior spine-like outgrowth, anterior process of anterior coxal fold well developed, 1st tibial spine on telopodite short/moderately long, acute/blunt............................................................. 8

8a Internal fold of posterior coxal fold bears upwardly directed triangular process, 1st tibial spine on telopodite acute with basal curvature.................................................................................... C. verhoeffi

8b Internal fold of posterior coxal fold bears mesally directed irregular process, 1st tibial spine on telopodite blunt without basal curvature................................................................................... C. palmatus

Figures

FIGURE 7. Carlogonus gayathri sp. nov., male. A: Gonopods, ventral view. B: Same, dorsal view. C: Right gonopod after removing telopodite, dorsal view. D: Left gonopod, lateral view. E: Same, mesal view. F: Left telopodite, ventral view. G: Same, lateral view. H: Enlarged view of distal part of left telopodite, mesal view. I: Enlarged view of blepharochaetae, lateral view. Abbreviations: alpAC = antero-lateral process of anterior coxal fold, amhpAC = antero-mesal hook-like process of anterior coxal fold, amtAC = antero-mesal thumb-like process of anterior coxal fold, AC = anterior coxal fold, B = blepharochaetae, C = distal longitudinal crest, F = femur, FS = femoral spine, dtpP = distal thorne-like process of palette, P = palette, apPC = apical process of posterior coxal fold, blpPC = baso-lateral process of posterior coxal fold, imPC = internal mesal fold of posterior coxal fold, lpPC = lateral process of posterior coxal fold, mpPC = mesal process of posterior coxal fold, PC = posterior coxal fold, PX = paracoxite, ST = sternite, T = telopodite, TS = tibial spine, TT = tibiotarsus. Arrows indicate indentation on lateral margin of anterior coxal fold (1) and basal bifurcated seta on tibial spine (2). Scale bars: A–G = 1 mm; H–I = 0.5 mm.