Entomobrya albitrigona Viana & Morais & Cipola 2024, sp. nov.
Creators: name: Viana, Stéphanie Dos Santos
name: Morais, José Wellington De
name: Cipola, Nikolas Gioia
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Collembola
Entomobryomorpha
Entomobryidae
Entomobrya
Entomobrya albitrigona

description: Entomobrya albitrigona sp. nov. Viana & Cipola   
Figs 42–47, 72, Table 2  
 Type Material. Holotype female on slide (INPA-CLL 0000240): Brazil, Amazonas state, Maués municipality, forest of “Santa Helena” farm, next to “Morais” road, 03°27’13”S, 57°39’01”W (Fig. 72), 23 m, 28.iv.2017 – 09.v.2017, malaise-trap, A Somavilla coll. Twenty paratypes: 2 males and 6 females on slides and 4 specimens in alcohol (INPA-CLL 0000241–49), 1 male and 1 female on slides (CC / UFRN), 1 male and 1 female on slides (MNRJ), and 1 juvenile on slide (MZUSP), same date as holotype; 3 specimens in alcohol (INPA-CLL 0000250), same date as holotype, except 25–28.iv.2017.   
 Other examined material. One female on slide (INPA): Brazil, Amazonas state, Manaus municipality, forest of the INPA, “Bosque da Ciência”, 03°05’54”S, 59°59’09”W (Fig. 72), 94 m, 20.vii.2010, entomological umbrellacollect, FGL Oliveira coll.   
 Diagnosis. Body blackish to bluish, Th II to Abd IV dorsally with one depigmented central triangle-shaped region (Figs 42A–B), Ant IV without the apical bulb (Fig. 43A); pl1 chaeta smooth and bifurcated (Fig. 43C); head macrochaetotaxy with 6–7 ‘ An ’, 3 ‘ A ’, 2–3 ‘ M ’, 7–9 ‘ S ’, 1 ‘ Ps ’, 4 ‘ Pa ’, 2 ‘ Pi ’, 1–2 ‘ Pm ’, 1 ‘ Pmp ’, 4 ‘ Pp ’, 1 ‘ Ppe ’ and 3 ‘ Pe ’ mac, respectively (Fig. 43D); labral papillae with 1 projection (Fig. 44A); labial papilla E l.p. conical and reaching the base of a.a. (Fig. 44B); sublobal plate with 3 inner appendages (Fig. 44C); Th II internally with 3–7 anterior, 4–6 median and 12–19 posterior mac; Th III–Abd I with 16–21 and 6–8 mac, respectively; Abd II–III with 3–4 and 0 inner mac, respectively; Abd IV with 15–20 inner and 10–13 outer mac (Figs 45A–C); unguiculus I–II ai lamella slightly truncate distally and pe serrated, unguiculus III ai slightly truncate, all lamellae acuminate (Fig. 46E); collophore anteriorly with 3 distal mac (Fig. 47A); dens distally only with regular chaetae (Fig. 47D); mucro proximal tooth larger than the distal one, basal spine surpassing the apex of the proximal tooth (Fig. 47D).   
 Description. Total length (head + trunk) of specimens 1.68–2.55 mm (n=4), holotype 2.55 mm. Specimens pale white to yellowish with dark blue pigments on Ant IV distally and proximal Ant I, body all pigmented, except for small irregular spots depigmented on head and trunk, including one central triangle-shaped region dorsally on Th II to Abd IV; Abd V–VI depigmented; collophore, coxa I–III and trochanter I–III depigmented; femur I–III pigmented or not; manubrium strongly or weakly pigmented on its proximal region; eyepatches black (Figs 42A–B).   
 Head.Antenna subequal or slightly shorter than the trunk length (Fig. 42A), ratio antennae: trunk = 0.97–0.84: 1 (n=4), holotype 0.97: 1; antennal ratio as I: II: III: IV = 1: 1.32–1.53: 1.22–1.59: 1.69–2.40 (n=4), holotype 1: 1.32: 1.22: 1.69. Ant IV weakly annulated on its distal 2/3 and devoid of apical bulb, with 3 apical finger-shaped sens, and numerous sens of different sizes (Fig. 43A). Ant III organ with 2 club-shaped sens, 3 guard sens, 2 elongated sens and at least 6 sens of different sizes. Ant II dorsally with about 9 elongated sens, 4 dorsal and 4 ventral mac (Fig. 43B). Ant I dorsally with 4 elongated sens, 2–3 mac and 3 smooth mic at the base (Fig. 43B). Eyes A and B larger, G and H slightly smaller than the others, with 6 interocular mes (q, v, s, p, r, t); head dorsal chaetotaxy (Fig. 43D) with 6–7 ‘ An ’, 3 ‘ A ’, 2–3 ‘ M ’, 7–9 ‘ S ’, 1 ‘ Ps ’, 4 ‘ Pa ’, 2 ‘ Pi ’, 1–2 ‘ Pm ’, 1 ‘ Pmp ’, 4 ‘ Pp ’, 1 ‘ Ppe ’ and 3 ‘ Pe ’ mac, respectively. Clypeal formula with 4 (l1–2), 6–8 (f), 3 (pf0 –1) ciliate chaetae, l1–2 longer and ciliate, apically acuminate, 2–4 f subtly larger than the others, others subequal (Fig. 43C). Prelabral chaetae smooth, pl1 bifurcated equally, pl2 normal or bifurcated equally or unequally (Fig. 43C). Labral papillae with 1 projection, inner papillae subtly larger than the outer papillae (Fig. 44A). Labial papilla E l.p. conical and reaching the base of a.a. (Fig. 44B). Maxillary palp b.c. 1.32 longer than t.a.; sublobal plate with 3 inner appendages (bs1–3) (Fig. 44C). Basolateral and basomedian labial fields with M1–2, R, E, L1–2 ciliate, M2 subtly smaller than the others, present or absent (Fig. 44D). Cephalic groove with 9 ciliate chaetae of different sizes; postlabial formula with 4 (G1–4), 4 (X2–4), 4 (H1–4) chaetae plus 1 chaeta between the series (Fig. 44E).   
 Thorax chaetotaxy (Fig. 45A). Th II a, m and p series (excluding the anterior collar) with 3–7, 4–6 and 12–19 mac, respectively. Th III a, m and p series with 6–7, 2–3 and 8–11 mac, respectively. Ratio Th II: III = 1.83–1.42: 1 (n=4), holotype 1.83: 1.   
 Abdomen chaetotaxy (Figs 45B–C). Abd I a and m series with 0–1 and 5–7 mac, respectively. Abd II a, m and p series with 0–1, 5 and 0–2 mac, respectively. Abd III a, m and p series with 1, 2 and 1 mac, respectively. Abd IV with 15–20 inner mac of A–C series and 10–13 outer mac of T – Fe; about 9 sens (ps type I and others type II) and 19 posterior mes. Abd V a, m, pa and p series with 2–3, 3, 1 and 5 mac, respectively. Ratio Abd III: IV = 1: 6.47–7.68 (n=4), holotype 1: 7.38.   
 Legs (Figs 46A–E). Subcoxa I with 3 chaetae and 2 psp; subcoxa II with an anterior row of 6–7 chaetae and about 5 anterior chaetae; posterior row of 3–4 chaetae and 2 psp; subcoxa III with one row of 6–9 chaetae, about 12 anterior chaetae and 2 psp (Figs 46A–C). Trochanteral organ with 17–39 spine-like chaetae (Fig. 46D). Tibiotarsus I–III with 7–8 inner finely ciliate mac. Unguis b.t. on proximal 1/3, m.t. on distal 1/3 and smaller than b.t., a.t. minute and on distal 1/7. Unguiculus I–III lamellae (ae, ai, pe, pi) smooth and acuminate, except I–II ai slightly truncate. Ratio unguis: unguiculus = 1: 0.48. Tibiotarsus III smooth chaeta 1.21 longer than the unguiculus; tenent hair 0.69 smaller than the unguis (Fig. 46E).   
Collophore (Fig. 47A). Anterior side with about 21 ciliate chaetae, 3 distal mac and about 18 chaetae of different sizes widely distributed on the corpus; posterior side with about 38 ciliate chaetae of different sizes widely distributed on the corpus (5 unpaired), distally with 1 smooth chaeta; lateral flap with 17 chaetae, 7 smooth and 10 ciliate.  
 Furcula (Figs 47B–D). Manubrium ventrally with 2 subapical and about 24 distal ciliate chaetae of different sizes. Manubrial plate dorsally with 7–10 chaetae of different sizes and 3 psp. Dens dental lobe with 2 (bs1 and bs2) thicker ciliate chaetae, bs1 subequal to bs2. Dens tightly crenulate on its distal 1/4 distally only with regular chaetae. Mucro proximal tooth larger than the distal one, mucronal spine surpassing the proximal tooth apex (Fig. 47D).   
 Distribution. Known only from Amazonas state, Brazil (Fig. 72).   
 Etymology. Refers to the triangular-shaped dorsal depigmented region on Th II to Abd IV (Fig. 42B) in the new species (from Latin: albi —white color, depigmented; and from Greek: trigon —triangular).   
 Remarks. Entomobrya albitrigona sp. nov. resembles E. acreanensis sp. nov. (see the remarks of E. acreanensis sp. nov. and Table 2) and Entomobrya nigritella Yosii & Ashraf, 1965 from Pakistan by the presence of a depigment triangle-shaped region on the body and labral papillae with 1 projection (see Yosii & Ashraf 1965: 167). However, E. albitrigona sp. nov. differs from these species by unguiculus III ai lamella slightly truncate and pe smooth (Fig. 46E) (ai acuminate and pe serrated in E. nigritella and E. acreanensis sp. nov.). Additionally, E. albitrigona sp. nov. also differs from E. nigritella by Ant IV apical bulb absent (Fig. 43A) (bilobed in E. nigritella), collophore anteriorly with 3 distal mac (Fig. 47A) (4 mac in E. nigritella), mucro proximal tooth larger than the distal one (subequal in E. nigritella), and mucronal spine surpassing the proximal tooth apex (not reaching in E. nigritella) (Fig. 47D).
description: Published as part of Viana, Stéphanie Dos Santos, Morais, José Wellington De & Cipola, Nikolas Gioia, 2024, Taxonomic revision of Entomobrya Rondani, 1861 (Collembola: Entomobryidae: Entomobryinae) from the Brazilian Amazon, pp. 1-110 in Zootaxa 5452 (1) on pages 59-65, DOI: 10.11646/zootaxa.5452.1.1, http://zenodo.org/record/11232742