Tasa

Genus Tasa described by Bohdanowicz and Proszynski, 1987

Systematic studies on East Palaearctic Salticidae (Araneae), IV. Salticidae of Japan

FIGS drawn by Hiroyoshi IKEDA (1995)

Logunov and Marusik (2000) COMMENTS;
Both the diagnosis of Tasa davidi (Schenkel, 1963) (i.e.a minor difference in the sharpness of the tibial apophysis) and the figures of Tasa nipponica　provided by Bohdanowicz and Proszynski (1987: figs. 300-303) leave almost no doubt that both species names are to be considered synonyms. The former species was originally described and then repeatedlly reported from China (Jangxi, Hunan, Shanxi) (vide Schenkel, 1963: sub Thianella d.; Wesoloeska, 1981a; Peng et all., 1993b; Song et al., 1999). We could not re-examine the holotype of T. davidi, as it was not found in the collection of the Museum national d'Histoire naturarelle (Paris, France) (C.Rollard, in litt.). Therefore, we do not dare formalize the synonymy prior to a revision of the holotype (or topotype) of T. davidi.

　　　　　　Genus Tasa Wesolowska, 1981

Thianella Schenkel, 1963: 411, nec Strand, 1907: 448.

The genus contains two species now, type-species T. davidi (Schenkel, 1963) (Wesolowska 181b: 157-159, ff. 88-92) from Southern China (?): Hantchongfu and here described T. nipponica sp.n. The genus is characterized by unusual structure of male palpal organ in which diamond-shaped bulbus is distally prolonged by thick embolus bent laterally and then medially (hook-shaped ) (figs. 300-303). Tibial apophysis basically biramous with additional small teeth; ventral branch smaller, in T. davidi needle-shaped, in T. nipponica rather thick (fig. 302). Femur of pedipalps ventrally with triangular protuberance. Cephalothorax rather elongate, flat and not much elevated. Pigmentation devoid of distinctly contrasting features.
The systematic position of the genus is not clear, there are some resemblances to Aerurillus, but no sure arguments. Female unkown.
(Bohd. and Prosz.,1987)

　　　 Species Tasa nippnica sp. n.

Material. 1 ♂ holotypus, 2 ♂♂-　paratypi - Japan: Kochi Pref., 28. VI. 1964, leg. T.Yaginuma - coll. T. Yaginuma and J. Proszynski.
Comparative material: 1♂-　holotypus ［Thianella davidi］　Breda davidi det. Schenkel, 1946, Hantchongfou ［leg.］ A. David - coll.MNHN - Paris.

Male. cephalothorax yellowish-brown with golden metallic gleam, dorsally almost flat, over eyes I scarce whitish setae and yellowish bristles. Eye field brownish, eyes surroundings (except anterior median pair) blackish. Ventral margin of carapace black.
Legs I brownish-grey, other legs yellowish-grey with grey rings at joints of metatarsus, tibia and patella; all legs with whitish bristles and spines on metatarsus.
Abdomen dark grey with inconspicuous greyish-brown pattern (resembling herring-bone) and with lighter dots, covered with grey setae and whitish bristles laterally. Lateral surfaces with longitudinal lines of yellowish dots. Anal turbercle and spinnerets blackish.
Facial part of cephalothorax contracted to eyes diameter; clypeus very narrow bordered black; chelicerae relatively long and thin, yellowish-fawn with 1 retromarginal and 1 (bifid on right chelicerae) retromarginal tooth. Palpal organ shown on figs. 300-303.
Sternum greysih-yellow with some whitish setae. Abdomen ventrally greyish-yellow, klaterally with longitudinal lines of yellowish dots.
Both remaining specimens similar. Differences: cephalothorax more fawnish-brown, also legs are pigmented more intensley. Abdomen in bigger male yellowish, with irregular blackish dots, tegument internally changed, in smaller male thoroughly greyish-black with yellowish dots.
(from Bohd. and Prosz.,1987)

Female. Unknown.

Measurements.

♂	0.70	length of eye field		height	h=
	1.90	length of cephalothorax	0.92	width of eye field I	a=0.37
	2.02	length of abdomen	0.98	width of eye field III	b=0.94
	d=1.33 (length of tibia IV:lenght of tibia III)				c=0.76
♂	0.76	length of eye field		height	h=	height/L of CT
	1.88	length of cephalothorax	1.01	width of eye field I (on level of eyes I)	a=0.40	L of EF/L of CT
	2.30	length of abdomen	1.09	width of eye field III (on level of eyes III)	b=0.93	W of eye I/W of eye III
	d=1.38　　(length of tibia IV:lenght of tibia III)				c=0.75	L of EF/W of EF eye I
♂	0.67	length of eye　field		height	h=
	1.51	length of cephalothorax	0.81	width of eye field I (on level of eyes I)	a=0.44
	1.76	length of abdomen	0.84	width of eye field III (on level of eyes III)	b=0.96
	d=1.28 (length of tibia IV:lenght of tibia III)				c=0.83

Length of segments of legs: Length of segments of legs:

	leg	femur	patella	tibia	metatar.	tarsus	ALL
♂	I	0.42	0.53	0.73	0.64	0.98	3.30
	II	0.36	0.50	0.56	0.50	0.78	2.70
	III	0.45	0.42	0.48	0.45	0.78	2.58
	IV	0.42	0.64	0.64	0.53	0.98	3.21
♂	I	0.45	0.62	0.90	0.76	1.06	3.79
	II	0.34	0.53	0.59	0.56	0.76	2.78
	III	0.42	0.62	0.53	0.45	0.76	2.78
	IV	0.53	0.76	0.73	0.59	1.12	3.73
♂	I	0.34	0.42	0.54	0.50	0.78	3.43
	II	0.36	0.36	0.39	0.36	0.70	2.17
	III	0.31	0.42	0.39	0.36	0.70	2.18
	IV	0.34	0.50	0.50	0.39	0.84	2.57

　　　　　　　　　　　　　　　　　 (from Bohd. and Prosz.,1987)

Figures;　See　http://salticidae.org/salticid/main.htm

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