Notogalumna rickiglesiasi, Villagomez & Palacios-Vargas & Páez, 2021

Villagomez, Fernando, Palacios-Vargas, José G. & Páez, Jair, 2021, A new species of Notogalumna from the canopy and another new edaphic species of Galumnopsis (Acari: Oribatida: Galumnoidea) from the tropical rainforest of Los Tuxtlas, Mexico, Zootaxa 5020 (1), pp. 171-183 : 172-176

Notogalumna rickiglesiasi sp. nov.

( Figs. 1–15 )

urn:lsid:zoobank.org:act:97B2D882-E9A0-47A2-B877-894E020B69F0

Diagnosis. Bothridial setae clavate, smooth; whole body with faintly granular cerotegument; all prodorsal setae present, in minute; all notogastric porose areas present of irregular shape; eleven notogastric setae present, minute; dorsosejugal suture interrupted below Ad; body shape almost hexagonal, with protuberances associated with A1 and A3, posterior region of notogaster striated in the middle; lyrifissures iad near anal plate; median pore (mp) and porose area postanalis (ap) absent, sexual dimorphism absent.

Description. Measurements in µm, average values in parenthesis (N=10). Length 580–670 (620), width 492– 532 (515).

Integument. Body mostly dark brown, porose areas darker, notogastric cerotegument granulated,ornamented with ellipsoidal irregular patterns, smaller in caudal region, pteromorphs granulated with the same pattern, ornamented with irregular sclerotized lines. Prodorsum densely punctuated and irregularly striated; two clear and yellowish thinning regions present in notogaster ( Fig. 1 ), the first from prodorsum (len), near seta in towards notogastric porose area Aa, the second (len?) from mid caudal region towards A1. A waxy semi conical projection can be observed in the caudal region of some specimens, just on the position of porose area A3, indicating a high glandular capacity of these structures, this wax was not diluted even in specimens maintained in 75% ethanol ( Fig. 1 ). The surface of subcapitulum, genital and anal plates slightly granulated, anal plates also with striation surrounding an 1, epimeral and anogenital region with the same ornamentation as notogaster.

Prodorsum (Figs. 1,3,5). Rostrum rounded, apical tooth not projecting; lamellar lines L and S present, arched and parallel; porose area dorsosejugal (Ad) (L=19, W=14) small, oval, or semicircular; all prodorsal setae present ( Fig. 9 ). Interlamellar setae (in) smooth and minute (4), lamellar setae (le) smooth, medium sized (60), rostral setae (ro) barbulated and longer than other prodorsal setae (82), inserted near ventral side. Bothridial setae (bs) short, clavate tending to globular, stalk thin and curved (L=28), sensillar capitulum smooth, with gradual widening as it approaches apical region (L=30, W=11), ending in gradual thinning.

Notogaster (Figs. 1,3,4). Hexagonal-rounded shape; with dorsophragmata well developed (hy); eleven pairs (lm, la, c, lp, p x, h 1, h 2, h 3, p 1, p 2, p 3) of minute smooth setae (7), caudal region with three to five longitudinal striae. All notogastric porose areas of irregular shape, with an inner polygonal and punctuated ornamentation ( Fig. 10 ). Aa (L=19, W=14) near hinge, regularly elongated to semicircular; A1 (L=28, W=20) posterior and semicircular, situated in a protuberance (best seen in caudal view) ( Fig. 4 ); A2 (L=25, W=15) lateral to A1, directed to body edge; A3 (L=25, W=32) in a posterior protuberance (best seen in posterior view). Notogastric seta lateroanterior (la) below Aa and near hinge, lateromedial (lm) posterior to la and directed towards sagittal line; seta lateroposterior (lp) and h 3 are located above A1, between them is situated lyrifissure im; h 2 is medial and inserted between A1 and A3, h 1 is located above A3; p 1, and p 2 below A3 and near the articulation with ventral plate, lyrifissure ip lateral to A3 and not between p 1 and p 2 as usual; seta p 3 lateral to A2 and near exterior margin, uppermost are located lyrifissures ips and ih; an extra alveoli (px) is inserted lateral to A2. Pteromorph slightly bilobed (Figs. 1,2,11) (L=335, W= 207 in proximal region, 210 in middle and 245 in distal), centrally notched, with seta c (7) near ending of sclerotized notch, lyrifissures ia as usual ( Fig. 11 ).

Gnathosoma . Subcapitulum morphology as usual in Galumnidae ( Fig. 6 ), slightly bilobed at tip, subcapitular setae setiform, microbarbed. Seta h (28) longer than m (24) and a (20); two pairs of adoral setae (or) (12) bifid and barbate. Chelicera ( Fig. 8 ) of normal shape (L=185, W=85), ornamented with punctuations in the anterior region, cha (55) longer than chb (40), both barbulated; Trägårdh’s organ present, projecting towards one third of chb, triangular shape. Pedipalp as usual in the group, with chaetotaxy from femur to tarsi 2–1–3–8(1+1). ( Fig. 7 ).

Epimeral and lateral podosomal regions ( Figs. 2–3 ). Epimeral setal formula: 2–0–2–1; setae smooth, and long, except seta 1b (3) which is minute, some specimens (representing the 8% of all specimens observed) only have the right 1b seta, lacking left 1b (even alveoli); seta 3b (15) longer than 1c (12), 3a (6) and 4a (8), pedotectum I (Pd I) subquadrate, pedoctectum II (Pd II) thinner and directed anteriorly, discidium subtriangular, blunt apex. Circumpedal carina (CP) thick, directed to Pd I; prodorsal leg niche (N) and lateral prodorsal ridges (T, E) present, exobothridial (ex) (4) seta above E, minute and thin.

Anogenital region ( Fig. 2 ). Six pairs of genital setae smooth and thin inserted in formula 3–3 (g 1–3) horizontally on anterior edge of the genital plate, g 4–6 vertically in a row), one pair of aggenital (ag) (4) thin, smooth, two pairs of anal setae (an 1–2) (4) and three pairs of adanal setae (ad 1–3) (3), adanal lysrifissure (iad) above ad 3 and lateral to genital plate. Porose area postanalis absent.

Legs. Measures made in the widest and longest regions of each article, mean N=10. Heterotridactylous legs with punctuated ornamentation on femora. Leg setation and solenidia from I-IV (solenidium in parenthesis). Femora 4–4–2–2; genua 3(1)–3(1)–1(1)–2; tibiae 4(2)–4(1)–3(1)–3(1); tarsi 20(2)–15(2)–15–12.

Leg I ( Fig. 12 ) Femur L=120, W=63; genu L=60, W=25; tibia L=81, W=41; tarsus L=100, W=34. Solenidium σ (87) inserted distally; φ 1 (205) very long, anterior to φ 2 (60); ω 1 (50) anterior to all tarsal setae, famulus (ε) (6) short, quadrate at tip, ω 2 (66) posterior to ft´, pl´´and ε. Leg II ( Fig. 13 ) Femur L=98, W=65; genu L=44, W=23; tibia L=66, W=40; tarsus L=78, W=25. Solenidium σ (37) short, distally; φ (135) long, distally; ω 1 and ω 2 identical in shape (35). Between them is situated ft´. Leg III ( Fig. 14 ) Femur L= 95, W=62; genu L=38, W=18; tibia L=93, W=28; tarsus L=110, W=25. Solenidium σ (25) shorter than l´, medially inserted; φ (100) long, inserted near the anterior edge. Leg IV ( Fig. 15 ) Femur L= 95, W=55; genu L=66, W=15; tibia L=95, W=24; tarsus L=115, W=20. φ (60) slightly displaced anteriorly.

Type material. Holotype (female) mounted on slide 08–10–2016, Mexico, Veracruz, Estación de Biología Tropical, Los Tuxtlas, sample by canopy fogging. 16 paratypes on slides with same data. This material is deposited in the Colección de Collembola de México y Ácaros Edáficos, Facultad de Ciencias , Universidad Nacional Autónoma de México, México.

Etymology. The species rickiglesiasi is named in honor of MSc Ricardo Iglesias Mendoza, who has dedicated many years to studying the oribatid mite fauna of Mexico. The epithet is a compound masculine noun in apposition in the nominative case, obtained by joining the affective nickname “Rick” with which he is known to his students and colleagues, his last name “Iglesias” and the desinence “i” in order to avoid possible confusions according to Art. 31.2.1. and the recommendation 31A of the international code of zoological nomenclature.

Remarks. The new species only resembles Notogalumna floridae ( Jacot, 1929) from the U.S.A. in having reduced interlamellar setae and a short bothridial seta with blunt apex (obovate head in terms of Jacot (1929)), but can be differentiated by length ratio of lamellar versus rostral setae (the lamellar setae shorter than rostral and in N. floridae the lamellar setae are longer than rostral), porose areas adalares semi rounded instead of triangular shaped, setae lp, h 3 and lyrifissure im anterior to A2 and without an evident projection on the basis of pteromophs. Additionally, the only species registered from Mexico is N. africana from which it differs in lacking a foveolated notogaster, the presence of four pairs of notogastric porose areas instead of three pairs in the latter species, porose areas A1 much smaller and without a boomerang-shape, and by the size of interlamellar and bothridial setae, which are bigger in N. africana .

Figures

FIGURES 1–4. Notogalumna rickiglesiasi sp. nov. 1. Notogaster in dorsal view, with a microphotograph of caudal region showing the wax present in A3; 2. Ventral plate; 3. Lateral region. Pteromorph and legs omitted; 4. Posterior region of notogaster and ventral plate.

FIGURES 5–11. Notogalumna rickiglesiasi sp. nov. 5. Prodorsum, frontal view; 6. Subcapitulum, ventral view; 7. Right pedipalp, antiaxial view; 8. Right chelicera, antiaxial view; 9. Prodorsal setae; 10.Notogastric poroseareas; 11. Right pteromorph, dorsal view.

FIGURES 12–15. Notogalumna rickiglesiasi sp. nov. 12. Right leg I, antiaxial view; 13. Left leg II, antiaxial view; 14. Right leg III, antiaxial view; 15. Left leg IV, paraxial view.