Balaustium izmirensis Noei & Ersin, 2019

Noei, Javad, Ersin, Firdevs & Çakmak, İbrahim, 2019, A new larval species of Balaustium (Acari: Actinotrichida: Erythraeidae) from Turkey, Turkish Journal of Zoology 43 (1), pp. 30-42 : 31-36

publication ID	https://doi.org/ 10.3906/zoo-1801-23
DOI	https://doi.org/10.5281/zenodo.11130172
persistent identifier	https://treatment.plazi.org/id/964687F4-FF8F-B23D-FFA9-4496FE00D5A3
treatment provided by	Felipe
scientific name	Balaustium izmirensis Noei & Ersin
status	sp. nov.

Treatment

Balaustium izmirensis Noei & Ersin View in CoL sp. nov. ( Figures 1–13 View Figure 1 View Figure 2 View Figures 3–4 View Figures 5‒7 View Figures 8‒10 View Figures 11‒13 )

Diagnosis. All scutalae off scutum; palpfemur with one seta; fn Tr 3-3-2; fn BFe 4-4-3; fn Ti I– III 11-11-11; fn Ta (20–22)-(17–19)-(18–20).

Description. (n = 16) Larva.

Dorsum ( Figure 1 View Figure 1 ; Table 1 View Table 1 ). Dorsal surface with 60–79 (fD) barbed setae. Scutum longitudinal, almost parallelsided, with a crista metopica. Alongside the crista is a lightly chitinized area and scutum distinguished from the propodosomal skin by the absence of the normal cuticular striations; sensillary area with two pairs of trichobothria (ASens and PSens); nonsensillary setae (AL, ML, and PL) located outside of the sclerotized area of the scutum (scutum without ML and PL on the right side in holotype 2a, without ML on the left side in paratype 2b, without PL on the right side in paratype 2c, without ML on both sides in paratype 6f, and with 2 ML on the right side in paratype 2p). AL , ML, and PL subequal in length, all barbed. Posterior sensilla (PSens) longer than anterior pair (ASens) and both barbed along their entire length. One eye (diameter 13–15 µm) placed laterally on each side of scutum.

Venter ( Figure 2 View Figure 2 ). Ventral surface of idiosoma with 40–56 (fV) barbed setae behind coxae III ( Table 1 View Table 1 ). Coxal plates punctate; all coxalae (1b, 2b, 3b) pointed and barbed. A peg-like supracoxal seta (eI) present on coxa I, 2 µm long. Sternal seta 1a inserted on a punctate area (distinguished from the sternal skin by the absence of the normal cuticular striations) next to coxae I and II and longer than sternal seta 3a, both barbed; 14–20 setae between coxae II and III. NDV = 120–147 ( Table 1 View Table 1 ).

Gnathosoma ( Figures 3 and 4 View Figures 3–4 ). Cheliceral bases punctate; subcapitulum with a barbed galealae (cs) and two hypostomalae, anterior (as) minute, spine-like, and posterior (bs) barbed; palptrochanter (17–25 µm) with one barbed seta (32–42 µm) (palptrochanter without seta on the left side in holotype 2a); palpfemur (37–50 µm) with one barbed dorsal seta (palpfemur without seta on the left side in paratype 2b) and palpgenu (27–32 µm) with two barbed dorsal setae (palpgenu with one seta on the left side in paratype 2d); palptibia (12–16 µm) with 3 barbed setae ( Figure 3 View Figures 3–4 ); palpal tibial claw (15–20 µm) entire, with a ventral median tooth; palptarsus (15–20 µm) with 3 barbed and one smooth seta, an eupathidium, and a solenidion; fPp = B-B-BB-BBB-3BNωζ ( Figure 4 View Figures 3–4 ). Supracoxal seta of palp peg-like (eP), 4 µm long.

Legs ( Figures 5 View Figures 5‒7 to 13). Leg segmentation formula 7-7- 7. Leg setal formulae are given in Table 2 View Table 2 . All leg tarsi with 2 claws and an empodium. Posterior claws bifurcate, one branch pulvilliform and another sickle-shaped with ciliations. Anterior claw and empodium of all leg tarsi falciform with ciliations. IP = 1025–1202.

Metric data are given in Table 1 View Table 1 .

Etymology. The specific epithet is derived from the city of origin, İzmir, Turkey.

Type material. The holotype (ARS-20170911-2a) and 5 paratype larvae (ARS-20170911-2b, 2c, 2d, 2e, 2f) were obtained (23, 24, and 27 March and 3 April 2016) by laboratory rearing from females collected from building walls and window ledges in Bornova , İzmir, Turkey, 38°28ʹN, 27°13ʹE, 30 m a.s.l., May 2015, coll. F. Ersin ; 10 paratype larvae (ARS-20170911- 2g, 2h, 2i, 2j, 2k, 2l, 2m, 2n, 2o, 2p), same date except 15, 16, 17, 20, 22, 23, and 27 March 2018.

Type deposition. The holotype (ARS-20170911- 2a) and 9 paratype larvae (ARS-20170911-2b, 2c, 2d, 2e, 2f, 2g, 2h, 2i, 2j) are deposited in the Acarological Collection of Jalal Afshar Zoological Museum ( JAZM), Department of Plant Protection , Faculty of Agriculture , University of Tehran, Karaj, Iran, and 6 paratype larvae (ARS-20170911-2k, 2l, 2m, 2n, 2o, 2p) in the Acarological Collection, Acarological Society of Iran, Department of Plant Protection, Faculty of Agriculture, University of Tehran, Karaj, Iran.

Remarks. The new species belongs to the genus Balaustium based on the following characters: palptrochanter and palpfemur each with one seta, fn Cx 1-1-1, fn trochanter 3-3-2, fn BFe 4-4-3, posterior claw on leg tarsi I– III bifurcate, composed of a sickle-shaped and a pulvilliform branch (see diagnostic characters of Balaustium presented by Fuentes Quintero et al., 2014). Balaustium izmirensis Noei & Ersin sp. nov. is most similar to B. yousifi in having one seta on palpfemur, fn BFe 4-4- 3, fn TFe 5-5-5, Ti III <104, and two setae on palpgenu, but differs from it in the number of normal setae on Ge I (8 vs. 9 in B. yousifi ), shorter ISD (50–62 vs. 64–69), AL (15–20 vs. 28–32), ML (20–25 vs. 28–32), PL (20–25 vs. 32–36), ASens (32–42 vs. 50–56), Ta I (60–70 vs. 82–91), Ti I (77–87 vs. 86–94), Ge I (72–85 vs. 88–93), Ta II (50–60 vs. 75–83), Ti II (57–70 vs. 75–79), Ge II (55–67 vs. 68– 74), Ta III (50–60 vs. 75–85), Ti III (72–87 vs. 89–97), Ge III (60–75 vs. 74–79), 2b (30–37 vs. 46–50), 3b (30–40 vs. 45–48), NDV (120–147 vs. 159–160), and IP (1025–1202 vs. 1294–1363). Balaustium izmirensis Noei & Ersin sp. nov. also differs from the other species as follows: from B. cristatum in the number of setae on palpfemur (1 vs. 2) and crista metopica (present vs. absent); from B. biscutalae in the eupathidium on Ta III (present vs. absent), NDV (120–147 vs. 174), scutalae (all off scutum vs. only PL off scutum); from B. leanderi in the number of setae on palpfemur (1 vs. 2), fn Tr (3-3-2 vs. 3-3-3), fn BFe (4-4- 3 vs. 4-4-4), scutalae (off scutum vs. on scutum); from B. barloventensis in the number of setae on palpgenu (2 vs. 3), fn TFe (5-5-5 vs. 5-5-4), scutalae (off scutum vs. on scutum); from B. malpaisesensis in the number of setae on palpgenu (2 vs. 3), scutalae (off scutum vs. on scutum); from B. brunoni in the number of setae on palpgenu (2 vs. 4), scutalae (off scutum vs. on scutum); from B. kendalli in the fn TFe (5-5-5 vs. 6-6-5) and scutalae (off scutum vs. on scutum); from B. innocentae , B. medardi , B. minodorae , and B. soydani in the fn BFe (4-4-3 vs. 4-4-2) and scutalae (off scutum vs. on scutum); from B. akramii , B. biljanae , B. kacperi , B. nikae , B. rajmundi , and B. wratislaviensis in fn BFe (4-4-3 vs. 4-4-2); from B. murorum and B. zhangi in fn BFe (4-4-3 vs. 4-4-2) and the number of solenidia on Ti I (2 vs. 3); from B. hernandezi in the fn TFe (5-5-5 vs. 7-6-6) and IP (1025–1121 vs. 1687–1851).