Melissotydeus bipunctata, Da-Costa & Rodighero & Silva & Ferla & Blochtein, 2019

Da-Costa, Tairis, Rodighero, Luana Fabrina, Silva, Guilherme Liberato Da, Ferla, Noeli Juarez & Blochtein, Betina, 2019, Two new species of Tydeidae (Acari: Prostigmata) associated with stingless bees, Zootaxa 4652 (1), pp. 101-112 : 104-107

publication ID	https://doi.org/ 10.11646/zootaxa.4652.1.4
publication LSID	lsid:zoobank.org:pub:97E3C49C-A9DF-418F-A7C6-2B2CE59D68E3
persistent identifier	https://treatment.plazi.org/id/403D87CD-FF86-FFF4-EE9A-F8840671F821
treatment provided by	Plazi
scientific name	Melissotydeus bipunctata
status	sp. nov.

Treatment

Melissotydeus bipunctata n. sp.

( Figs. 8–13 View FIGURE 8 View FIGURE 9 View FIGURE 10 View FIGURES 11–12 View FIGURE 13 )

Diagnosis. Strongly striated with reticulated dorsal shield between bo setae, setae la very small, ro longer than la and serrate, and bo very long (30–41) and serrate. Female chaetotaxy of leg I 8 (+1 ω)-3(+1 κ)-3-3-1, leg II 6 (+1 ω)-2-2-3-0; palp setation 6(+1ω)-2-2. Palp tarsus with eupathidium ρζ semilunar distally.

Description. Adult female (n = 6)—Body of medium size ( Fig. 8 View FIGURE 8 ). Length of idiosoma 174 (158–174), width 125 (120–139).

Dorsum ( Fig. 8 View FIGURE 8 ). Dorsum with 10 pairs of setae (ro, la, bo, c1, c2, d, e, f1, f2, h1 and h2).

Dorsal ornamentation: Ornamentation type Tydeus , dorsum with strong striations and irregular reticulation ( Fig. 9A View FIGURE 9 ). Prodorsum reticulated between ro, la and bo ( Fig. 9B View FIGURE 9 ). Setae ex absent. Opisthosoma transversely stri- ate between c1, c2; also transverse striae between setae d, e and f1, encircled with striae to form an oval ( Fig. 9C View FIGURE 9 ), transverse striae between f2, h1 and h2. Cross-ties on striae ‘‘x’’- shaped. Eyes absent. All dorsal setae very short and serrated (including bo) except ro, f2, and h1-2 which are slightly longer, but still do not reach setae in next row (excluding bo). Lyrifissures ia located between setae c1 and d, im situated close to e. Lengths of dorsal setae: ro 7 (6–7); la 4 (4–5); bo 37 (30–41); c1 3 (3–4); c2 3 (3–5); d 3 (3–4); e 5 (3–6); f1 6 (3–6); f2 7 (6–8); h1 9 (7–9) and; h2 9 (7–9). Distances between dorsal setae: ro-ro 23 (17–23); la-la 52 (49–54); bo-bo 51 (50–52); c1-c1 49 (44–49); c2-c2 89 (82–89); d-d 24 (22–24); e-e 65 (50–65); f1-f1 17 (16–17); f2-f2 39 (32–39); h1-h1 9 (9–12); h2-h2 28 (28– 31); ro-la 23 (21–26); c1-d 30 (22–30); d-e 30 (21–30); e-f1 40 (32–40); f1-f2 13 (8–13) and; h1-h2 10 (7–12).

Venter ( Fig. 10 View FIGURE 10 ). Faintly striated with longitudinal striae between setae pt, and transverse striae between mt α and mt β. Ventral setae very short and serrated. Lyrifissures ih located posteroventrally. Measurements of setae: pt 8 (8–9); mt α 12 (5–12); mtβ 7 (4–8). Four pairs of aggenital setae (ag1, ag2, ag3 and ag4). Setal lengths: ag1 7 (6–8); ag2 6 (6–8); ag3 7 (6–9); ag4 9 (5–9); g1 5 (4–5); g2 5 (4–6); g3 6 (4–7); g4 6 (4–8); g5 10 (5–10); g6 8 (6–10); ps1 15 (11–15) and; ps2 13 ( Fig. 9D View FIGURE 9 ). Shape of cg organ elliptical ( Fig.10 View FIGURE 10 ).

Gnathosoma ( Fig. 11 View FIGURES 11–12 ). Length 44 (43–48), width 39 (36–40). Gnathosoma visible from above. Subcapitulum with transverse striae behind sc1 and sc2. Infracapitular setae simple. Setal lengths: sc1 9 (7–11), sc 2 7 (7–15). Palp setation 6(+1ω)-2-2, palp 38 (34–45) long ( Fig. 12 View FIGURES 11–12 ). Setae d simple. Palp tarsus with eupathidium ρζ semilunar distally. Cheliceral stilettos 15 (13–18). Palptarsus significantly longer than cheliceral digits.

Legs ( Fig. 13 View FIGURE 13 ). All leg setae serrated. Tarsi I-IV with two claws and hairy empodium but empodial hooks (om) are absent. Chaetotaxy of legs I–IV (tarsus to trochanter): I: 8(+1ω)-3(+1κ)-3-3-1 ( Fig. 13A View FIGURE 13 ); II: 6(+1ω)-2-2-3-0 ( Fig. 13B View FIGURE 13 ); III: 5-2-1-2-1 ( Fig. 13C View FIGURE 13 ); IV: 5-2-1-2-0 ( Fig. 13D View FIGURE 13 ). Length of leg I 129 (109–140); leg II 108 (85–113); leg III 107 (92–112); leg IV 109 (96–114).

Length of tarsus + apotele I 34 (33–36), width 15 (13–17); length of solenidion ωI 5 (4–7); length of seta ft’ 21 (14–21); ft’’ 12 (12–13); length of seta k 4 (4); length of ωII 4 (4–7).

Type material. Female holotype and five female paratypes, as follows : Female holotype, two paratypes, Porto Alegre, Rio Grande do Sul, Brazil, from nests of S. bipunctata , April 03, 2018, T. Da-Costa . Three female paratypes, same data March 22, 2018 . The female holotype and a female paratype were deposited at the Departamento de Entomologia e Acarologia, Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo ( ESALQ / USP), Piracicaba, state of São Paulo, Brazil . Two paratypes were deposited at the Museu de Ciências e Tecnologia, Pontifical Catholic University of Rio Grande do Sul ( PUCRS), Porto Alegre, Brazil . Other paratypes were deposited at the Museu de Ciências Naturais ( ZAUMCN), Universidade do Vale do Taquari—Univates, Lajeado, Rio Grande do Sul, Brazil

Male. not found.

Etymology. The name bipunctata originated from the name of its stingless host species S. bipunctata .

Remarks. This new species resembles M. macrosolenus for having small dorsal setae and strong striae on its idiosoma. It differs from this species as it has serrated trichobothria (bo) instead of plumose trichobothria (bo) and it has an irregular reticulated prodorsum (reticulation absent in M. macrosolenus ).