Micariaparvotibialis, Booysen & Haddad, 2021

Booysen, Ruan & Haddad, Charles R., 2021, Revision and molecular phylogeny of the spider genus Micaria Westring, 1851 (Araneae: Gnaphosidae) in the Afrotropical Region, Zootaxa 4940 (1), pp. 1-82 : 57-58

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https://doi.org/ 10.11646/zootaxa.4940.1.1

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sp. nov.

Micariaparvotibialis View in CoL sp. nov.

Figs 27 View FIGURES 27–36 , 69 View FIGURES 65–71 , 149 – 150 View FIGURES 145–150

Type material. Holotype: ♂, SENEGAL: Saint Louis Region: Richard Toll , 5–10 km East of Richard Toll, semiarid thorn bush, hand collecting, 16°20’N, 15°30’W, leg. J. Everts, IX.1989 (MRAC 172110). GoogleMaps

Paratypes: SENEGAL: Saint Louis Region: same data as holotype but VIII.1989, 2 ♂ (MRAC 172100), with 1 non–type immature GoogleMaps .

Etymology. The species name is derived from the Latin adjectives parvus (short) and tibialis (concerning the tibia). The name refers to the very short palpal tibia of the male, which is approximately half the length of the cymbium.

Diagnosis. The males of this species can be distinguished from other larger Afrotropical Micaria in having a very short tibia, a small inward slanting MA, the absence of an RTA and a narrow curvature in the sperm duct. The females of this species are unknown.

Description. Male (holotype from Richard Toll, MRAC 172110): Measurements: TL 2.50, CL 1.10, CW 0.70, CL:CW 1.57, CLH 0.06, CLH:AME 1.14. Eyes: ALE 0.05, AME 0.06, PLE 0.06, PME 0.06, AME–AME 0.03, PME–PME 0.06, MOQAW 0.14, MOQPW 0.17, MOQL 0.18. SL 0.56, SW 0.41, AL 1.85, AW 0.65. Leg measurements: Palpal segment lengths: 0.30, 0.16, 0.14, 0.29. Leg I: 0.67, 0.29, 0.58, 0.46, 0.46. II: 0.64, 0.27, 0.54,?,?. III: 0.54, 0.25, 0.43, 0.46, 0.38. IV: 0.62, 0.30, 0.65, 0.65, 0.44. TLoflegs (I–IV): 2.46, 1.45, 2.06, 2.66; leg formula: possibly 4123.

Colouration: carapace dark brown; abdomen dark brown or black; femora darkened; sternum, endites, labium, and chelicerae similar in colour to carapace ( Fig. 27 View FIGURES 27–36 ). Carapace: smooth in texture; decorated with squamose setae; pattern faded, radiating from middle; posterior margin rounded; anterior margin narrowing slightly from coxa I; PER procurved in dorsal view, AER straight in anterior view; fovea absent. Chelicerae: decorated with plumose setae. Labium: triangular in shape; cluster of setae present on tip. Endites: oblique; serrula present. Sternum: shieldlike; broadest between coxa Iand II; posterior margin narrowly truncating between coxa IV; few long, aculeate setae present. Legs: femora laterally flattened, highest at base, leg Imore pronounced in this fashion; rest of legs normal, thin; decorated with lanceolate setae ( Fig. 69 View FIGURES 65–71 ). Leg macrosetae: Palps: 1pl, 1do, 1pl, 1pl, 1plv, 3vt. Leg I: 1do, 1pl. II: 1d. III: 1do, 1pl, 1pl, 1plv, 1rlv, 2vt, 1plv, 1rlv, 4vt. IV: 1do, 1rl, 1plv, 2vt, 2plv, 4vt. Legs I–IV with two rows of scopulate setae on metatarsi and four rows on tarsi. Abdomen: cylindrical in shape; decorated with squamose setae; dorsal pattern not visible; venter similar in colour to dorsum; sigilla not visible. Palp: retrolateral tibial apophysis absent; median apophysis present, small, thin, offset from embolus at retroapical edge of bulb; sperm duct present on retrolateral surface of tegulum, curved at midpoint of tegulum, kink at end of duct; cymbium elongate, widest at basal third; apex of cymbium half its length above tegulum; two small spines at cymbial tip; two ventral terminal spines prolaterally in front of embolus ( Figs 149, 150 View FIGURES 145–150 ).

Distribution. Micaria parvotibialis sp. nov. is only known from its type locality ( Map 5 View MAP 5 ).













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