Mistaria nyeupenyeusi G.M. Kioko & S. Li

Kioko, Grace M., Kioko, Esther N., Li, Shuqiang & Ji, Liqiang, 2018, On four species of the genus Mistaria Lehtinen, 1967 (Araneae, Agelenidae) from Kenya, African Invertebrates 59, pp. 111-126: 111

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Mistaria nyeupenyeusi G.M. Kioko & S. Li

sp. n.

Mistaria nyeupenyeusi G.M. Kioko & S. Li  sp. n. Figs 5, 6

Type material.

Holotype ♂, Kenya, Nyeri County, Naro Moru Town, Mount Kenya National Reserve Naro Moru gate, Met station, S00°10.230', E037°12.143', about 3000 m a.s.l., 24 July 2017, Q. Zhao & G. Kioko ( NMK). Paratypes, 7 ♀, same data as holotype ( IZCAS).


Specific name comprises the two Swahili words ‘nyeupe’ and ‘nyeusi’ which mean white and black, respectively. It is descriptive of the general colour pattern of the species; noun in apposition.


Males of M. nyeupenyeusi  G.M. Kioko & S. Li, sp. n. can be separated from those of M. leucopyga  by having a blunt and thick embolus compared to sharp tipped and thin embolus in the former species (Fig. 5D). Another distinguishing character is the presence of a basal embolic outgrowth in M. leucopyga  that is absent in this species (Fig. 5E). Females can be distinguished by the shape of the epigyne delimiting edge which is square-shaped compared to concave in M. leucopyga  (Fig. 5A). The species can be separated from M. zorica  by the shape of the anterior lobe of the vulva which is triangular compared to ovoid in the latter species and also by the position and sclerotisation of the copulatory ducts which are 2/3 the length of the pit and lightly sclerotised in M. zorica  compared to occupying the entire pit and heavily sclerotised in M. nyeupenyeusi  (Figs 4B, 6B).


Male. Total length 5.06. Carapace 2.25 long, 1.9 wide. Abdomen 2.81 long, 1.6 wide. Habitus as in Fig. 6C. Carapace rounded. V-shaped pattern on the carapace formed by the first two lateral lines from the cephalic region and the fovea. Eye sizes and interdistances: AME 0.13, ALE 0.14, PME 0.11, PLE 0.14, AME–AME 0.06, AME–ALE 0.06, PME–PME 0.09, PME–PLE 0.11. Chelicerae red-brown. Labium and endites brown suffused with black and creamy apically. Sternum black with a cream line in the middle, width 1/3 wide size of sternum. Legs cream-white with black rings on all femora. Leg measurements: I 8.80 (2.50, 3.10, 1.90, 1.30), II 8.21 (2.40, 2.40, 2.00, 1.41), III 7.81 (1.90, 2.70, 1.91, 1.30), IV 7.81 (2.20, 2.40, 2.00, 1.21). Abdomen with a cream-coloured, ribbon-like chevron marking dorsally and one dotted cream chevron below it. Ventre of abdomen black-brown with cream-coloured horizontal stripes laterally.

Palp as in Fig. 5 A–E. Cymbium small and rounded, 0.95 long. Cymbium tip 1/4 the size of the cymbium length. Sub-tegulum raised at point of attachment to the fulcrum. Patellar apophysis short, about 1/4 length of the patellar. Tibia 1/3 length of patellar (Fig. 5C). Median apophysis with a wide base and narrow apex, curved apically. Embolus thick, no embolic outgrowth at the base (Fig. 5E).

Female. Total length 4.97. Carapace 2.0 long, 1.9 wide. Abdomen 2.97 long, 2.4 wide. Habitus as in Fig. 6D and E. U-shape pattern on carapace formed from two lateral lines on cephalic region and the first pair of lateral bands. Carapace cream-coloured suffused with black and covered with white setae. Eye sizes and interdistances: AME 0.12, ALE 0.16, PME 0.14, PLE 0.13, AME–AME 0.06, AME–ALE 0.06, PME–PME 0.12, PME–PLE 0.09. Chelicerae, labium and endites brown-black. Sternum black with a white-brown median stripe. Cream-white legs with black bands at the joints. Leg measurements: I 10.30 (3.30, 3.00, 2.70, 1.30), II 7.00 (2.20, 2.20, 1.60, 1.00), III 6.50 (2.00, 1.90, 1.70, 0.90), IV 9.40 (2.50, 3.10, 2.50, 1.30). Abdomen brown-black with cream-coloured spots, pattern of the chevron markings ribbon-like with the lower chevron mark wider. Proximal segment of posterior spinnerets black, distal segment brown.

Epigyne as in Fig. 6A, B. Epigyne teeth anterior origin, wide posteriorly and narrow distally, lateral notches reduced to almost absent (Fig. 6A). Square shaped sclerotised delimiting edge, heavily sclerotised copulatory ducts, first lobe of spermatheca triangular (Fig. 6A, B). Copulatory ducts positioned anteriorly (Fig. 6B). Spermatheca lobe size is reduced posterioly i.e. anterior lobe largest and posterior lobe smallest (Fig. 6B).


Known only from the type locality (Fig. 7).