Two new species of Lepidocyrtus (Fractocyrtus) Cipola & Bellini (Collembola Entomobryidae, Lepidocyrtinae), with new records and a new name for Lepidocyrtus (F.) americanus Cipola & Bellini, 2018 Author Cipola, Nikolas Gioia 0000-0002-7594-9574 Laboratório de Sistemática e Ecologia de Invertebrados do Solo, Instituto Nacional de Pesquisas da Amazônia - INPA, CPEN. Avenida André Araújo, 2936, Aleixo, 69067 - 375, Manaus, AM, Brazil. & Corresponding Author: Nikolas Gioia Cipola: nikolasgc @ gmail. com; https: // orcid. org / 0000 - 0002 - 7594 - 9574 nikolasgc@gmail.com Author Viana, Stéphanie Dos Santos Laboratório de Sistemática e Ecologia de Invertebrados do Solo, Instituto Nacional de Pesquisas da Amazônia - INPA, CPEN. Avenida André Araújo, 2936, Aleixo, 69067 - 375, Manaus, AM, Brazil. text Zootaxa 2023 2023-11-10 5369 3 369 399 https://www.mapress.com/zt/article/download/zootaxa.5369.3.3/52248 journal article 10.11646/zootaxa.5369.3.3 1175-5326 10151336 B16AF2B9-ADB0-4FA3-BA52-838560C328F5 Subgenus Fractocyrtus Cipola & Bellini, 2018 Type species: Lepidocyrtus amazonaensis Cipola nom. nov. (Fig. 2 ) Diagnosis of subgenus. Antennae, legs (except coxae II–III) and collophore without scales. Antennae shorter than body length (Figs 2 , 6 , 13); Ant IV not annulated and without apical bulb. Four ciliate prelabral chaetae ( Figs 3A ). Th II slightly projected over the head anteriorly (Figs 2, 6, 13). Th II, Th III and Abd IV (laterally) polychaetotic, covered by numerous small ciliated mic interspersed among scales ( Figs 15A , 16B ). Abd III laterally with a tuff of elongated chaetae ( Figs 9A , 16A ). Body psp pattern ( Figs 4–5 , 10 , 17 ): anteriorly to eyepatches (0), clypeus inner (2), Th II–Abd IV (1), coxae I–III (2, 4, 2), proximal manubrium (1), manubrial plate (2) and proximal dens (6–7); lateral psp: Th III–Abd III (0), BP4 variable; ventral psp: as Ant III (1), Ant II (1, rarely 5), Ant I (0), Th I–III (1), collophore anteriorly (1) and posteriorly (1), between collophore and tenaculum (1), tenaculum posteriorly variable, Abd IV (0) and anterior to genital plate (1 unpaired). Unguiculus inner lamella excavate ( Figs 3B , 11E ). Dens dorsally with at least 10 proximal ciliate spines and a large, apically truncate dental tubercle ( Figs 3C , 12C , 18F ). Mucronal spine with small basal spinelet ( Fig. 12D ). FIGURE 1. Symbols used in the chaetotaxy descriptions of L. ( Fractocyrtus ) species. The following characters are shared in four Fractocyrtus species known: Habitus typical of Lepidocyrtinae (Figs 2, 6, 13); brownish scales weakly ciliate, oval, elongated or pyriform (rarely) and apically rounded, truncate or irregular unilaterally or bilaterally (rarely) present on all head, thorax, abdomen, coxae II–III ( lapsus as “absent” in L. ( F. ) mateosi in Cipola et al. 2018b ), and manubrium and dens ventrally (Figs 2, 6, 7E, 11B–C, 12B). Head. Ant I–IV with numerous finger-shape sens and ciliate chaetae; Ant I dorsally with 3 proximal sens-like smooth chaetae (Ant I organ sensu Ḩther 1986) ( Figs 7B , 14B ). Eyes 8 per side with 5 interocular chaetae ( q , v , p , r , t ); eyepatches posterior region with 1 bothriotrichum ( Pa6 ) ( Figs 7B , 14B ). Four prelabral chaetae ( pl1–2 ) ciliated and subequals ( Fig. 3A , 7C ). Labral formula with 4 ( a1–2 ), 5 ( m0–2 ), 5 ( p0–2 ) smooth chaetae, a1 moderately thicker, p0–2 largest, others subequals ( Fig. 3A ). Labral papilla absent ( lapsus as “present” in Cipola et al. 2018b ) ( Fig. 3A ). Maxillary palp with smooth t.a. and b.c. ; sublobal plate with 1 minute distal appendix ( s.b.4 ) and 3 inner appendages ( s.b.1–3 ) smooth and subequals ( Fig. 3A ). Labial palp with 5 main papillae (A–E) plus 1 hypostomal papilla (H), with 0, 5, 0, 4, 4, 2 guard appendages, respectively ( Fig. 3A ); papilla E l.p. reduced ( Figs 7D , 14D ). Labial palp with 5 subequal smooth p.c. ; basolateral and basomedian labial fields with chaetae a1–5 smooth on anterior row ( a2 largest), M2 , E and L1–2 ciliate ( M1 absent), r reduced to a spine-like mic ( Figs 7E , 14E ). Dorsal trunk chaetotaxy. Th II–Abd IV macrochaetotaxy formula with 0, 0| 0, 1+1, 0, 2 mac; Th II–Abd V with ms and sens formula 1,0|1,0,1,0,0 and 1, 1| 0,1, 1,+,3, respectively ( Figs 8–9 , 15–16 ). Abd II–IV bothriotrichal formula 2 ( a5 , m2 ), 3 ( a5 , m2 , m5 ), 2 ( T2 , T4 ) ( Figs 8D – 9B , 15D – 16B ). Legs. Tibiotarsus I–III outer side distally with 1 tenent hair finely ciliate and apically capitate, inner side of tibiotarsus III with 1 smooth chaeta ( Fig. 3B ). Pretarsus with one anterior and one posterior small chaeta ( Fig. 11E ). Unguis I–III outer side with 2 paired lateral teeth and 1 unpaired proximal medial tooth; inner edge with 4 teeth, 2 paired b.t. , 1 unpaired m.t. subequal to b.t. and 1 unpaired a.t. slightly smaller; unguis I–II b.t. on proximal fifth, m.t. on proximal half and a.t. on distal fifth; unguis III b.t. on a little less than proximal half, m.t. on proximal third and a.t. on distal sixth ( Figs 3B , 11E ). Unguiculus I–III with 4 lamellae ( ai , ae , pi , pe ) acuminate and smooth, except pe serrate and ai weakly excavate ( lapsus as “truncate” in Cipola et al. 2018b ) strongly on I–II and less on III ( Figs 3B , 11E ). Furcula. Manubrium ventrally with 3 inner ciliate chaetae, 1 outer chaeta somewhat larger (as “subequal” in L. ( F. ) mateosi in Cipola et al. 2018b ) than the others ( Figs 12B , 18F ). Dens dorsally with a large, apically truncate dental tubercle ( Figs 3C , 12C ); ventral side distally with at least 1 lanceolate ciliate chaeta ( Fig. 12D ). Mucro bidentate with distal tooth larger than proximal tooth, mucronal spine surpassing apex of proximal tooth and with 1 small basal spinelet ( Fig. 12D ).