Ablemma shimojanai (Komatsu, 1968)

Fu, Hongjin, Wang, Yuzhu & Tong, Yanfeng, 2022, A newly-recorded species of the genus Ablemma Roewer, 1963 (Araneae, Tetrablemmidae) from China, Biodiversity Data Journal 10, pp. 85365-85365 : 85365

Ablemma shimojanai (Komatsu, 1968)

Materials

Type status: Other material. Occurrence: individualID: SYNU-506; individualCount: 2; sex: 1 male, 1 female; lifeStage: adult; Taxon: scientificName: Ablemma shimojanai (Komatsu, 1968); order: Araneae ; family: Tetrablemmidae ; genus: Ablemma ; Location : country: China; stateProvince: Guangdong; county: Shaoguan City ; locality: Zhangjiuling Forest Park ; verbatimElevation: 200 m; verbatimCoordinates: 24°48'27"N, 113°32'44"E; Identification : identifiedBy: Yanfeng Tong ; Event : samplingProtocol: sifting leaf litter; eventDate: 8 April 2021 Type status: Other material. Occurrence: individualID: SYNU-507; individualCount: 5; sex: 3 males, 2 females; lifeStage: adult; Taxon: scientificName: Ablemma shimojanai (Komatsu, 1968); order: Araneae ; family: Tetrablemmidae ; genus: Ablemma ; Location : country: China; stateProvince: Guangdong; county: Jieyang City ; locality: Huangqishan Forest Park ; verbatimElevation: 120 m; verbatimCoordinates: 23°34'12"N, 116°22'15"E; Identification : identifiedBy: Yanfeng Tong ; Event : samplingProtocol: sifting leaf litter; eventDate: 18 April 2021

Description

Male. Habitus as in Fig. 1 A-C. Body brownish-yellow. Total length 0.97; carapace 0.51 long, 0.35 wide; abdo-men 0.61 long, 0.43 wide. Prosoma (Fig. 1 D and F): carapace finely reticulate; 4 eyes, white, strongly recurved as seen from above; clypeus high, sloping for-ward, marginally rounded; cephalic part raised, posterior part with large conical projection; chelicerae robust, with small basal projection on anterior surface of paturon and an anterodistal tooth (Fig. 1 G), cheliceral lamina well developed; labium triangular, blunt distally; sternum finely reticulated, with sparse setae (Fig. 1 E). Legs yellowish-orange.

Opisthosoma (Fig. 1 A-C and H): dorsal scutum oval, dimpled with tiny pits, smooth between pits, covered with sparse setae; ventral scutum rugose; perigenital plate absent; postgenital plate (PG) straight, nearly same width as preanal plate (PA), 1/4 of the preanal plate length; preanal plate rectangular, with thick posterolateral corners (PLC) and posteromedial projection (PMP).

Palp (Fig. 3 A-I): femur (FE) approxi-mately 2 times longer than patella (PAT); tibia (TI) not swollen, with dorsal trichobo-thrium distally; cymbium (CY) small, cup-shaped; bulb (BU) long pear-shaped, surface smooth; sper-m duct (SD) broad basally, narrow distally; embolus (EM) short, foot-shaped, strongly sclerotised distally, with small acute tip.

Female. Habitus as in Fig. 2 A-C. Total length 0.96; carapace 0.44 long, 0.32 wide; abdomen 0.65 long, 0.41 wide. Cephalic part lacking large conical projection, chelicerae unmodified; epigynal fold (EF) distinct; other features as in male.

Genitalia (Fig. 3 J-L): vulval stem (VS) forming an oval structure, strongly sclerotised; vulval duct (VD) weakly sclerotised, con-nected to translucent, saccular seminal receptaculum (SR); inner vulval plate (IVP) long; central process absent.

Diagnosis

This species is similar to Ablemma berryi Shear, 1978 in the large conical projection of male carapace (cf. Fig. 1 C and F and Shear 1978: fig. 90), but can be distinguished by the acute tip of the embolus (Fig. 3 A-I; vs. very long, laminar embolus, see Shear 1978: figs 93 and 94) and the large preanal plate, which is nearly four times the length of the postgenital plate (Fig. 1 H and Fig. 2 H; vs. two times the length of the postgenital plate, see Shear 1978: fig. 95).

Distribution

China (Guangdong), Japan (Ryukyu Island).

Figures

Figure 1. Ablemma shimojanai (Komatsu, 1968), male. A habitus, dorsal view; B habitus, ventral view; C habitus, lateral view; D prosoma, dorsal view; E prosoma, ventral view; F prosoma, lateral view; G prosoma, anterior view; H abdomen, ventral view. Abbreviations: PA = preanal plate; PG = postgenital plate; PLC = posterolateral corners; PMP = posteromedial projection. Scales: 0.2 mm.

Figure 2. Ablemma shimojanai (Komatsu, 1968), female. A habitus, dorsal view; B habitus, ventral view; C habitus, lateral view; D prosoma, dorsal view; E prosoma, ventral view; F prosoma, lateral view; G prosoma, anterior view; H abdomen, ventral view. Scales: 0.2 mm.

Figure 3. Ablemma shimojanai (Komatsu, 1968), male, A-C (light) and D-I (SEM); female, J (SEM) and K, L (light). A left palp, prolateral view; B left palp, retrolateral view; C left palp, dorsal view; D left palp, prolateral view; E left palp, retrolateral view; F left palp, dorsal view; G distal part of bulb, prolateral view; H distal part of bulb, retrolateral view; I distal part of bulb, dorsal view; J genital area, ventral view; K genital area, dorsal view; L genital area, ventral view. Abbreviations: BU = bulb; CY = cymbium; EF = epigynal fold; EM = embolus; FE = femur; IVP = inner vulval plate; PA = preanal plate; PAT = patella; PG = postgenital plate; PLC = posterolateral corners; PMP = posteromedial projection; SD = sperm duct; SR = seminal receptaculum; TI = tibia; VD = vulval duct; VS = vulval stem. Scales: A-G, J-L = 0.1 mm; H, I = 0.05 mm.