Anderemaeus dentatus Norton & Ermilov 2019, n. sp.
Creators: name: Norton, Roy A.
name: Ermilov, Sergey G.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Sarcoptiformes
Caleremaeidae
Anderemaeus
Anderemaeus dentatus

description: Anderemaeus dentatus n. sp.
(Figs 10–16)
Diagnosis
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.
Adult
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, B). Cerotegument (Fig. 13) with larger excrescences columnar to phallus-shaped, covered in dust-like granules (Fig. 13F insert); smaller excrescences amorphous to irregularly granular (Fig. 13B).
Prodorsum (Figs 10A, 11A). 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 10A, 11). With uniform, shallow foveolation visible in reflected light (Fig. 12B insert). Humeral process (hpr; Fig 12H) 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, F), 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. 10B). Epimere I with small area of foveation in anterolateral corner and on mentotectum (Fig 12G). 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 10B, 11A). 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. 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. 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. 13C), 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. 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. 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. 16C).
Etymology
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.
description: Published as part of Norton, Roy A. & Ermilov, Sergey G., 2019, Anderemaeus (Acari, Oribatida) - overview, three new species from South America and reassessment of Anderemaeidae supported by ontogeny, pp. 241-289 in Zootaxa 4647 (1) on pages 256-264, DOI: 10.11646/zootaxa.4647.1.17, http://zenodo.org/record/3353053