Anderemaeus dentatus,

Norton, Roy A. & Ermilov, Sergey G., 2019, Anderemaeus (Acari, Oribatida) - overview, three new species from South America and reassessment of Anderemaeidae supported by ontogeny, Zootaxa 4647 (1), pp. 241-289: 256-264

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Anderemaeus dentatus

n. sp.

Anderemaeus dentatus  n. sp.

( Figs 10–16View FIGURE 10View FIGURE 11View FIGURE 12View FIGURE 13View FIGURE 14View FIGURE 15View FIGURE 16)


Anderemaeus  species with adults 614–680. Rostrum with terminal mucro. Lamella with strong triangular tooth projecting anterolaterally, just proximal to small cusp; lamella continuing anteriorly as distinct prolamella; pair strongly convergent, with mutual distance of setae le distinctly less than that of pair ro. With distinct transverse prelamellar ridge. Seta in long, inserted well anterior to notogastral margin, without supporting tubercle; with isolated subtriangular tubercle posterior to each seta. Bothridial seta long, baculiform. Notogastral setae erect, heavily barbed, relatively long. Femora III, IV with simple ventral keel (III) or large blade (IV); trochanters III and IV with large dorsodistal spine, smaller proximal tooth.

This is the only known Anderemaeus  species with a strong, conspicuous tooth on the lamella, just posterior to the lamellar seta. Among neotropical species, only A. chilensis  shares the anteriorly displaced seta in, inserted far from the sejugal groove and distant from the pair of triangular tubercles.


Measurements. Holotype (female) length 680, maximum notogastral width 431; range (including 4 female, 3 male paratypes) 614–680 × 398–448. Females larger than males: 614–640 × 415–431 vs. 547–597 × 365–398.

Integument. Cuticle shiny in reflected light or dulled with organic and mineral debris attached to cerotegument ( Fig. 12A, BView FIGURE 12). Cerotegument ( Fig. 13View FIGURE 13) with larger excrescences columnar to phallus-shaped, covered in dust-like granules ( Fig. 13FView FIGURE 13 insert); smaller excrescences amorphous to irregularly granular ( Fig. 13BView FIGURE 13).

Prodorsum ( Figs 10AView FIGURE 10, 11AView FIGURE 11). Rostrum with terminal mucro, rostral bulge strongly developed. Lamella with complex form: broadened at mid-length, with additional strong triangular tooth projecting anterolaterally, just proximal to small cusp; continuing anteriorly as distinct prolamella. Space between lamellae distinctly foveate anteriorly; pair strongly convergent, prolamellae nearly touching anteriorly: mutual distance of setae le distinctly less than that of pair ro. With distinct transverse prelamellar ridge (plr), length similar to ro mutual distance. Setae ro (53–61), le (73–86) and ex (32–36) thin, attenuate, weakly barbed, le usually with accentuated bend. Seta in long (118–127), relatively thick, acicular, barbed; inserted without distinct basal tubercle, well anterior of notogastral margin. With isolated, subtriangular interbothridial tubercle located posterior to but distant from each seta in. Bothridial setae (118–127) shorter than mutual distance of pair; baculiform or slightly tapered distally, with sparse, inconspicuous barbs, directed laterally or posterolaterally.

Notogaster ( Figs 10AView FIGURE 10, 11View FIGURE 11). With uniform, shallow foveolation visible in reflected light ( Fig. 12BView FIGURE 12 insert). Humeral process (hpr; Fig 12HView FIGURE 12) strongly developed. Notogastral setae of medium length (h 1, 61–65; p 1, 53–57; others 77–86). Seta c attenuate, barbed, curving posterolaterally, extending past lyrifissure ia; others thickened, erect, heavily barbed ( Fig. 13E, FView FIGURE 13), slightly tapered or sometimes slightly dilated distally, inserted on small tubercles. Seta lm distinctly anterior to level of la, about equidistant between la, c; mutual distance of pair lm only slightly greater than setal length; h 2 aligned with h 1, h 3.

Coxisternum ( Fig. 10BView FIGURE 10). Epimere I with small area of foveation in anterolateral corner and on mentotectum ( Fig 12GView FIGURE 12). Enantiophysis e3 absent, or represented by vaguely-defined, small posterior tubercle only. Tubercles bearing setae 3b, 3c strong, isolated, that of 3b sometimes expressed as low mound extending across sejugal groove. Aggenital enantiophysis (e4) well developed across border bo.4, its posterior tubercle about twice as large as anterior; latter, bearing seta 4b, with low ridge running anteriorly across epimere IV. Epimeral setae thin, attenuate, weakly and sparsely barbed; 3c and 4c (36–41) longer than others (20–24).

Anogenital region ( Figs 10BView FIGURE 10, 11AView FIGURE 11). Setae thin, attenuate, smooth or sparsely barbed. Anterior genital seta (20–24) longer than others (12–16); aggenital (20–24), anal (12–16) and adanal (20–24) setae in typical positions. Preanal organ only slightly expanded internally.

Gnathosoma ( Fig. 14View FIGURE 14). Subcapitulum longer than wide (123–135 × 90–102). Subcapitular setae attenuate, inconspicuously roughened; h (28–32) longer than a and m (20–24). Adoral setae (12–16) attenuate, smooth. Palps (90–94), postpalpal seta (8), and chelicera (123–135) typical of genus; cheliceral setae acuminate to attenuate, barbed, cha (36–41) longer than chb (24–28).

Legs. Form and proportions of segments shown in Fig. 15View FIGURE 15. Tarsi significantly (I, II) to slightly (III, IV) longer than respective tibiae. Genua I, II notably longer than III, IV. Femora III, IV only slightly longer than wide, ventral keel moderate on III, large, blade-like on IV ( Fig. 13CView FIGURE 13), neither with tooth or spine. Trochanters III, IV with prominent dorsodistal spine; III with smaller proximal spine, IV with small proximal tooth. Setation typical of genus; form and locations of setae and solenidia shown in Fig. 15View FIGURE 15. Solenidion σ of genu I subflagellate, distinctly longer than segment; that of other genua shorter than segment (II) or of similar length (III); φ of tibiae II–IV subflagellate, equal or only slightly less than segment length.

Juveniles (larva unknown)

( Fig. 16View FIGURE 16)

Length and width of protonymph 310–359 × 199 (n =2), deutonymph 426 × 245 (n = 1), tritonymph 582 × 348 (n=1). Bothridial seta distinctly tapered and consistently, strongly curved anteriad ( Fig. 16CView FIGURE 16).


The specific name dentatus  (toothed) is a Latin adjective that refers to the conspicuous tooth on the prodorsal lamella.

Material examined

Holotype (female): Chile, Los Lagos Region, Osorno Province, Parque Nacional Puyehue, 4.1 km east of Anticura , 430 m a.s.l., 26-XII-1982, A. Newton and M. Thayer, from Valdivian rainforest litter  . Paratypes: 7 (4 females, 3 males) with same data as holotype; 12 (unsexed) from Parque Nacional Puyehue, Aguas Caliente, 425 m a.s.l., 3-I-1985, N. Platnick, O. Francke, from Valdivian forest litter  . Other material: Los Ríos Region, Valdivia Province, Rt. 39, 30 km east of Los Lagos, near Panguilulli, 11-III-2005, E. Toledo, col. (13 adults, 1 trito-, 1 deuto-, 2 protonymphs; habitat unknown).

Type deposition

The holotype is deposited in the SMNH; five paratypes are deposited in the TSUMZ, one in the UCMZ, preserved in ethanol with a drop of glycerol. The remainder of paratypes are in the personal collection of RAN, three on slides, others in ethanol.