Erythraeus (Erythraeus) hubeiensis, Xu & Yi & Guo & Jin, 2019

Xu, Si-Yuan, Yi, Tian-Ci, Guo, Jian-Jun & Jin, Dao-Chao, 2019, The genus Erythraeus (Acari: Erythraeidae) from China with descriptions of two new species and a key to larval species of the genus worldwide, Zootaxa 4647 (1), pp. 54-82 : 54-82

Erythraeus (Erythraeus) hubeiensis sp. nov.

( Figs. 1–11 )

Diagnosis (larva). fnBFe = 2-2-2; Ta I 176–180; Ti I 289–306; Ta III 161–176; Ti III 393–415; fD 35–38.

Description (n = 10; holotype, 9 paratypes). Dorsum. Idiosoma with 37 (fD = 35–38 in paratypes) barbed setae and with blunted ends. Two pairs of eyes without platelets placed on each side ( Fig. 1 ). Scutum sub-rounded or oval, wider than long, anterior margin straight, posterior margin slightly convex. Scutum with two pairs of normal setae (AL and PL) and two pairs of trichobothria (ASE and PSE), scutalae barbed and with pointed ends, AL ˃ PL, PW ˃ AW ( Table 1 ). Two pairs of trichobothria (ASE and PSE) with minute barbs in distal half. ASE slightly behind AL bases, PSE bases far from bases of PL and close to posterior edge of scutum ( Figs. 1 , 3 ).

Venter. All ventral setae including coxalae with pointed tips. One pair of nude sternalae 1a, one pair of barbed sternalae 3a, 1a ˃ 3a in length ( Table 1 ) and eight pairs of barbed setae behind coxae III (fV = 16–18). Coxal setae barbed, coxalae 1b longer than 2b and 3b, and 3b slightly longer than 2b ( Fig. 2 , Table 1 ). NDV = 52–54.

Gnathosoma with one pair of nude galealae (cs), two pairs of nude hypostomalae (as and bs) ( Fig. 4 ); bs (37–45) much longer than as (9–15), hypostomal lip fimbriate. Dorsum of palpfemur and palpgenu each with one barbed and pointed setae, palptibia with one nude seta and one barbed seta on venter, one barbed seta on dorsum, odontus bifid ( Fig. 4 ). Palptarsus with eight setae including two barbed setae, four nude setae, one solenidion (ω), one eu- pathidium (ζ), and one Cp ( Figs. 4, 5 ), fPp = 0-B-B-BBN 2 -BBNNNNωζCp ( Fig. 5 ). Palpal supracoxal seta (elcp) peg like.

Leg ( Figs. 6–11 ) with seven segments (femora divided). IP = 3239–3401 (Holotype and nine paratypes). Pedal basifemur I with one nude and pointed tip seta ( Fig. 6 ), other setae on legs barbed and pointed. Leg setae formula: Leg I: Cx—1n; Tr—1n; BFe—2n (B, N); TFe—5n; Ge—1σ, 1κ, 8n; Ti—2φ, 1κ, 1Cp, 14n; Ta—1ω, 1ε, 2ζ, 26n. Leg II: Cx—1n; Tr—1n; BFe—2n; TFe—5n; Ge—1κ, 8n; Ti—2φ, 15n; Ta—1ω, 2ζ, 23n. Leg III: Cx—1n; Tr—1n; BFe—2n; TFe—5n; Ge—8n; Ti—1φ, 15n; Ta—1ζ, 24n.

Etymology. The name of the new species is derived from the province where it was collected.

Type material. Holotype: larva ex nymph of unidentified species in Typhlocybini ( Cicadellidae : Typhlocybinae ), mite parasitic on head, collector SI-YUAN XU, 11 August 2015, Qizimeishan National Natural Reserve , Hubei Province, China . Paratypes: 5 larvae ex plants, one larva ex unidentified species of Aphididae , mite attached to pronotum, same data as the holotype ; 3 larvae ex nymph of unidentified species in Typhlocybini , mites parasit- izing head, mesothorax and end of abdomen, collector SI-YUAN XU, 17 August 2015, Huaping Township, Jianshi County, Hubei Province, China . The holotype and all paratypes are deposited in the Institute of Entomology, Guizhou University, China ( GUGC) ( Zhang 2018).

Remarks. Erythraeus (Erythraeus) hubeiensis sp. nov. belongs to the species groups with fn Bfe 2-2-2 (2-2-1) ( Šundić et al. 2015a, b; Stålstedt et al. 2016). This group includes 10 species: E. (E.) phalangoides (De Geer, 1778) ; E. (E.) tinnae Haitlinger, 1997; E. (E.) chinensis ( Zheng, 2002); E. (E.) picaforticus Haitlinger, 2002; E. (E.) kacperi Haitlinger, 2004 ; E. (E.) yangshuonicus Haitlinger, 2006; E. (E.) etnaensis Haitlinger, 2011; E. (E.) walii Kamran, Afzal, Raza, Bashir & Ahmad, 2011; E. (E.) serbicus Šundić, Haitlinger & Hakimitabar, 2015; E. (E.) aphidivorous Šundić, Haitlinger, Michaud & Colares, 2015.

Erythraeus (Erythraeus) hubeiensis sp. nov. differs from E. (E.) phalangoides in having sternalae 1a nude (vs. barbed), and by a number of measured characters given in Table 4.

E. (E.) hubeiensis sp. nov. differs from E. (E.) tinnae in having sensillary setae of scutum nude (vs. barbed in the latter). The new species is also different from the latter as follows: basifemur I has two setae, of which one is nude and another one barbed (vs. two barbed setae); lesser number of setae in fD formula (35–38 vs. 47). Other dif- ferences are in Table 4.

E. (E.) hubeiensis sp. nov. differs from E. (E.) chinensis as follows: eyes are without platelets (vs. with platelets), apices of 2b and 3b are pointed (vs. blunt); two pairs of hypostomal setae are present (vs. one pair); BFe I has one nude seta (vs. two barbed setae), and the greater number of setae are in fV formula (16–18 vs. 12).

E. (E.) hubeiensis sp. nov. differs from E. (E.) picaforticus as follows: scutum is sub-rounded or oval (vs. hexagonal), BFe I has one nude seta (vs. two barbed setae). The new species differ from E. (E.) picaforticus by lesser number of setae in fD formula (35–38 vs. 72). Other differences are Table 4.

E. (E.) hubeiensis sp. nov. differs from E. (E.) kacperi in having BFe I with one nude seta (vs. two barbed setae); the greater number of setae in fD formula (35–38 vs. 29) and in fV (16–18 vs. 8); the presence of solenidion on Ge I (vs. absent). Other differences are in Table 4.

E. (E.) hubeiensis sp. nov. differs from E. (E.) yangshuonicus in having BFe I with one nude seta (vs. two barbed setae); eyes without platelets (vs. with platelets). The new species differs also from E. (E.) yangshounicus by lesser number of setae in fD formula (35–38 vs. 56). Other differences are Table 4.

E. (E.) hubeiensis sp. nov. differs from E. (E.) etnaensis in having Ge I and Ge II with microsetae (vs. absent) and Ti I with companion seta (vs. absent). The new species also differs from E. (E.) etnaensis in having BFe I with one nude seta (vs. two barbed setae); and lesser number of setae in fD formula (35–38 vs. 64).

E. (E.) hubeiensis sp. nov. differs from E. (E.) walii as follows: one nude seta on BFe I is present (vs. absent), solenidion on Ge II is absent (vs. present). Other differences are Table 4.

E. (E.) hubeiensis sp. nov. differs from E. (E.) serbicus by Ta II without famulus (vs. with famulus); lesser dorsal setae (35–38 vs. 70–71). Other differences are in Table 4.

E. (E.) hubeiensis sp. nov. differs from E. (E.) aphidivorous as follows: eyes are without platelets (vs. with platelets), 2b and 3a have pointed apices (vs. bifid at apices) and BFe I has one nude seta (vs. two barbed setae). Other differences are in Table 4 .

Figures

FIGURE 1. Erythraeus (Erythraeus) hubeiensis sp. nov., larva. Dorsal view of idiosoma.

FIGURE 2. Erythraeus (Erythraeus) hubeiensis sp. nov., larva. Ventral view of idiosoma.

FIGURE 3–5. Erythraeus (Erythraeus) hubeiensis sp. nov., larva. 3—scutum, 4—ventral view of gnathosoma, 5—ventral view of palp tarsus.

FIGURES 6–7. Erythraeus (Erythraeus) hubeiensis sp. nov., larva. 6—leg I, trochanter–genu, 7— leg I, tibia–tarsus.

FIGURES 8–9. Erythraeus (Erythraeus) hubeiensis sp. nov., larva. 8—leg II, trochanter–genu, 9—leg II, tibia–tarsus.

FIGURES 10–11. Erythraeus (Erythraeus) hubeiensis sp. nov., larva. 10—leg III, trochanter–genu, 11—leg III, tibia–tarsus.

Tables

TABLE 1. Measurements of Erythraeus (Erythraeus) hubeiensis sp. nov. (larvae, a–j = paratypes)

character	Holotype	a	b	c	d	e	f	h	i	j	SD	range
fD	37	36	36	36	38	35	36	36	37	36	0.8	35–38
fV	16	16	16	16	16	18	16	16	16	16	0.9	16–18
IL	494	821	528	694	373	709	397	395	740	404	160.9	373–821
IW	391	750	514	581	282	650	358	302	681	350	162.4	282–750
DS	66–78	63–81	63–77	57–74	59–77	66–79	61–77	68–84	62–76	60–74	2.2–3.3	57–68
PDS	71–78	72–81	69–77	69–74	66–77	70–79	68–77	73–84	70–76	67–74	2.1–2.2	66–84
Oc’	21	21	17	19	18	21	17	18	18	19	1.5	17–21
Oc’’	17	16	13	14	15	18	15	14	13	14	1.6	13–18
1a	74	73	73	69	73	70	74	69	71	72	1.8	69–74
1b	111	106	106	102	96	96	99	94	100	99	5.1	96–111
2b	43	34	32	34	30	30	31	30	32	31	3.7	30–43
3a	51	49	51	46	47	50	51	48	51	52	1.9	46–52
3b	47	45	44	42	41	42	44	42	43	47	2.0	41–47
L	103	100	94	97	90	93	95	91	105	98	4.7	90–105
W	121	117	120	118	119	121	112	117	123	122	3.0	112–123
AW	55	47	47	48	50	53	47	51	53	50	2.7	47–55
PW	94	92	91	95	93	94	87	86	96	93	3.1	86–96
MA	22	19	20	20	19	21	18	20	22	18	1.4	18–22
AA	15	11	13	13	15	14	12	13	14	13	1.2	11–15
SB	16	14	14	16	16	15	14	14	15	14	0.9	14–16
ISD	73	73	68	71	65	70	70	64	72	66	3.1	64–73
AP	48	50	47	51	46	47	45	46	47	49	1.8	45–51
AL	103	98	101	/	94	/	96	91	97	100	3.6	91–103
PL	91	90	88	/	83	/	86	77	/	89	4.5	77–91
ASE	56	53	59	/	49	/	51	53	55	51	3.0	49–59
PSE	88	79	80	/	76	/	77	82	74	82	4.1	74–88
PaScFed	54	59	59	54	56	53	49	47	51	49	3.9	47–59

...Continued on the next page