Trichothyas (Lundbladia) feuerborni (K. Viets, 1929)

LiK, Hai-Tao, SmitK, Harry, K, Xin-Yao Gu, JinK, Dao-Chao & GuoK, Jian-Jun, 2024, The first records of the subfamily Euthyadinae K. Viets, 1931 (Acari, Hydrachnidia, Hydryphantidae) from China with description of one new species, Acarologia 1931 (1), pp. 105-122 : 106-114

publication ID	https://doi.org/ 10.24349/eahs-q4xf
publication LSID	lsid:zoobank.org:pub:9BC9A6D6-6BB3-41F8-9306-AD3CE76A9F0A
persistent identifier	https://treatment.plazi.org/id/FD4687CA-3C63-406C-1BFF-2D810520FE34
treatment provided by	Felipe
scientific name	Trichothyas (Lundbladia) feuerborni (K. Viets, 1929)
status

Treatment

Trichothyas (Lundbladia) feuerborni (K. Viets, 1929) ( Figures 2–8 View Figure 2 View Figure 3 View Figure 4 View Figure 5 View Figure 6 View Figure 7 View Figure 8 )

Habitat — Turbulent current with organic detritus, gravels and cobblestones in the mountain.

Material examined — 5 ♂♂, Mount Huangshan World Geopark, Anhui Province, P. R. China (30°04′41″N, 118°09′01″E, 530 m a.s.l.), collected by Xu Zhang, 20-V-2010. Slides

No. AH-HY-2010052001–2010052005.

Diagnosis — Male. All dorsal plates widely separated; FS inverse isosceles trapezoid approximately; posterior edge of D 2 close to posterior edge of FS; middle margin of ACG with two rows of densely feathered setae; C 2 both rounded under optical microscope and SEM; trapezoidal PS with indentation at the frontal margin, GF touching third pair of acetabula, Gp extending to frontal margin of third acetabula; a round CP located anterior to V 3 ; a pair of V 1 separated; P-4 terminal with a seta-liked protrusion; I-L-3 bearing two strong dorsal peg setae on one side.

Description — Male (n=5). Integument papillae bluntly pointed, interspaces with fine lineation ( Figure 2A View Figure 2 ). In dorsal view: apical angles of Cx-I and Cx-II visible in dorsal view; all dorsal plates widely separated; FS inverse isosceles trapezoid approximately, with median eye, O 2 and five muscle attachments; posterior edge of D 2 close to posterior edge of FS; ACP with a muscle attachment in the middle; PCP with a pair of muscle attachment; all LP with a muscle attachment, LP 1 and 4 triangle, LP 2 and 3 trapezoidal ( Figures 3A View Figure 3 , 4A View Figure 4 ). In ventral view: middle margin of ACG with two rows of densely feathered setae ( Figure 2B View Figure 2 ); C 2 both rounded under optical microscope and SEM ( Figures 2C View Figure 2 , 4B View Figure 4 ); trapezoidal PS with indentation at the frontal margin ( Figure 4B View Figure 4 ), three pairs of acetabula arranged in two rows and closed ( Figure 2D View Figure 2 ), GF touching third pair of acetabula, Gp relatively long, extending to frontal margin of third acetabula, a round CP located anterior to V 3, a pair of V 1 separated ( Figures 3B View Figure 3 , 4B View Figure 4 ). In lateral view: except L 1 and L 4, four sclerotized plates with varying shapes near the body axis and separated from each other ( Figures 3C View Figure 3 , 4C View Figure 4 ). In frontal view: A 1 fused with a triangular plate, lateral eyes attached to O 1 platelets ( Figures 3D View Figure 3 , 4D View Figure 4 ). In rear view: V 4 separated with LP

4 ( Figures 3E View Figure 3 , 4E View Figure 4 ).

Gnathosomal base long and slender ( Figure 5A View Figure 5 ). Chelicera base relatively long; chela with teeth on one side ( Figure 5B–D View Figure 5 ). Palp five-segmented ( Figure 6A, C View Figure 6 ); P-1 short, with two feathered setae; P-2 with three dorsal and two lateral feathered setae; P-3 with two dorsal feathered setae; P-4 terminal with three fine setae and a seta-liked protrusion ( Figure 6B, D View Figure 6 ); venter of P-5 with a very small seta on one side ( Figure 6B, D View Figure 6 ).

Legs robust ( Figures 7–8 View Figure 7 View Figure 8 ): I-L-3 bearing two strong dorsal peg setae on one side ( Figure 7A View Figure 7 ); IV-L slenderer than other legs obviously ( Figure 8C–D View Figure 8 ).

Female. Not collected.

Measurements — Male (n=5). I L/W 873–944/665–708; FS L/W 271–327/316–366;

ACP L/W 118–146/141–177; PCP L/W 155–187/218–245; LP 1–4 L/W 198–233/120–152, 192–196/174–204, 164–187/148–182, 155–190/229–242. ACG L/W 251–290/194–221; PCG

L/W 257–294/208–218; PS L/W 48–62/65–77; Gp L 146–182; GF L 175–216; Ac-1–3 L/W 50–61/28–34, 58–68/21–25, 64–68/43–45; EP L 12–13; CP L/W 37–43/33–43. G L 246–270;

CB L 161–189, CC L 61–67; Palp segments L: P-1–5 26–33, 70–79, 41–45, 90–100, 34–38.

Leg segments L: Ⅰ-L-1 67–70, Ⅰ-L-2 102–125, Ⅰ-L-3 54–63, Ⅰ-L-4 76–86, Ⅰ-L-5 85–100, Ⅰ-L-6 90–100; II-L-1 73–80, II-L-2 124–153, II-L-3 55–68, II-L-4 85–110, II-L-5 108–117, II-L-6

133–140; III-L-1 95–109, III-L-2 134–144, III-L-3 58–72, III-L-4 93–106, III-L-5 102–113,

III-L-6 118–130; IV-L-1 132–149, IV-L-2 152–173, IV-L-3 103–121, IV-L-4 168–205, IV-L-5 134–152, IV-L-6 132–143.

Remarks — So far, a total of 11 species (subspecies) of the subgenus Lundbladia K.

Viets, 1929 have been recorded worldwide, so far males of eight species have been described

(Table 1). The males from Anhui can well be distinguished from T. (L.) alborzensis Bader

& Sepasgozarian, 1979 by the shape of FS and genital field ( Bader & Sepasgozarian 1979). Membranous strips between dorsal sclerites of T. (L.) compressa K. Viets, 1953 and T. (L.) muscicola ( Mitchell, 1953) are narrower than in the males from Anhui ( Goldschmidt & Gerecke 2003 ; Mitchell 1953). Gp of the males from Anhui are relatively long and extend to the frontal margin of third acetabula, while in T. (L.) paracunctans Gerecke, 2020 the gonopore extends to the second acetabula ( Gerecke 2020).

Due to a similar genital field structure (especially PS) and the position of the dorsal sclerites we assigned the males from Anhui to T. (L.) feuerborni (K. Viets, 1929) . There are some small differences, however, between the specimens from Java and China. The posterior margin of Cx-IV is convex in the male from Java, but straight in the male from Anhui. Moreover, the plate lateral to L 2 is divided in the male from Java, but complete in the male from Anhui. Possibly,

larval parasitism on tipulids dipterans allow populations to keep gene flow over wide areas

with their aerial drifting hosts ( Mitchell 1953).

Distribution — Java (K. Viets 1935); Subfamily and Genus are new records for China (this

study).

R	Departamento de Geologia, Universidad de Chile
V	Royal British Columbia Museum - Herbarium
LP	Laboratory of Palaeontology
CB	The CB Rhizobium Collection
CC	CSIRO Canberra Rhizobium Collection
T	Tavera, Department of Geology and Geophysics