Blakistonia olea

Harrison, Sophie E., Rix, Michael G., Harvey, Mark S. & Austin, Andrew D., 2018, Systematics of the Australian spiny trapdoor spiders of the genus Blakistonia Hogg (Araneae: Idiopidae), Zootaxa 4518 (1), pp. 1-76: 53-55

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Blakistonia olea

sp. n.

Blakistonia olea  , sp. n.

( Fig. 21View FIGURE 21 A–L)

Type material. AUSTRALIA: Western Australia:GoogleMaps  Holotype male, Peak Charles National Park   GoogleMaps, site LH9, 32°54’34.3”S, 121°10’19.3”E, 26 March 2012, Allocasuarina  woodland, S. Comer, E. Adams (WAM T127864View Materials).

Diagnosis. Males of B. olea  can be distinguished from those of all other Blakistonia  species by the AME being significantly larger than the ALE ( Fig. 21DView FIGURE 21). Females are unknown.

Description. Holotype male (WAM T127864). Small idiopid spider (total length 11.6).

Colour (in ethanol; Fig. 21View FIGURE 21 A–C): Carapace and chelicerae olive-brown, darker around lateral margins ( Fig. 21AView FIGURE 21); sternum, labium and maxillae uniformly yellow; abdomen darker mottled olive-brown with lighter pattern of four thin chevrons, joined by pale, oblong medial patch ( Fig. 20A, CView FIGURE 20); legs and pedipalp lighter than carapace, with dorsal femora the darkest ( Fig. 21View FIGURE 21 G–L).

Cephalothorax: Carapace 5.4 long, 4.2 wide, 3.9 high, 1.3 times longer than wide; oval ( Fig. 21AView FIGURE 21), caput moderately raised, ocular area raised ( Fig. 21CView FIGURE 21); cuticle smooth, with pits outward from fovea and each side of caput; fovea straight; row of four thick setae between fovea and eye group, culminating in several longer, thickened setae directly posterior to eye group; carapace sparsely setose, with indistinct lines of setae radiating outwards from fovea, slightly more concentrated on lateral margins; median clump of thickened setae on clypeus ( Fig. 21DView FIGURE 21). Length of median clypeus less than 1.0; anterior margin slightly convex. Eye group 1.0 wide, 0.6 long, 0.2 of carapace width; anterior eye row strongly procurved, PLE–PLE/ALE–ALE ratio 1.0; posterior eye row slightly recurved; AME ca. twice the size of ALE and separated by about half of ALE; PLE ca. half of ALE and separated by about ALE diameter; PME pale, about half of PLE, and separated from PLE by less than its own diameter ( Fig. 21DView FIGURE 21). Labium without cuspules ( Fig. 21FView FIGURE 21). Sternum 2.9 long, 2.4 wide, evenly setose; sigilla indistinct ( Fig. 21EView FIGURE 21). Maxillae with 8 (left) and 4 (right) cuspules ( Fig. 21E, FView FIGURE 21).

Legs: diffusely setose and spinose; tarsi I, II ventrally swollen; tarsi I, II weakly scopulate ( Fig. 21View FIGURE 21 G–I). Paired tarsal claws: leg I p2 (2 large) r6 (6 large); leg II p5 (5 large), r5 (2 large, 3 small); leg III p3 (1 large, 2 small), r3 (3 large); leg IV prolateral claw missing, r3.

Spination: Tibia I with two prolateral macrosetae ( Fig. 21View FIGURE 21 G–I). All other legs diffusely setose and spinose, with no clear demarcation between lanceolate setae and smaller spine-like setae.

Leg and pedipalp measurements: Length of legs IV> I> II> III. Leg I: femur 5.3, patella 2.4, tibia 3.8, metatarsus 4.0, tarsus 2.2, total = 17.7. Leg II: femur 4.8, patella 2.2, tibia 3.5, metatarsus 3.9, tarsus 2.2, total = 16.6. Leg III: femur 3.9, patella 2.0, tibia 2.9, metatarsus 3.8, tarsus 2.5, total = 15.1. Leg IV: femur 5.1, patella 2.5, tibia 4.9, metatarsus 5.6, tarsus 3.0, total = 21.1. Pedipalp: femur 2.9, patella 1.5, tibia 2.6, tarsus 1.2, total = 8.2.

Pedipalp: Femur with dorsal spines, patella with thickened ventral setae; tibia short and swollen, RTA short and pointed, with thick clump of setae on tip, and covered in short, dense spinules for ca. half of distance between base of apophysis and distal tibia; long, erect setae on ventral tibia; bulb uniform, globular; embolus simple, slightly longer than bulb, slender, tapering, tip slightly twisted; cymbium covered in fine setae ( Fig. 21View FIGURE 21 J–L).

Abdomen: Setose, oval, three pairs of indistinct, unsclerotised dorsal sigilla; 6.2 long, 3.4 wide ( Fig. 21AView FIGURE 21).

Variation: None.

Etymology. The specific name is taken from the Latin olea  (meaning ‘olive’), in reference to the olive-green the colour of this species. Distribution. Blakistonia olea  is known only from Peak Charles National Park, in Western Australia ( Fig. 33View FIGURE 33).

Remarks. Although females of Blakistonia  have been found from this location, we cannot link them with certainty to this male due to lack of genetic data from the male and females, the conservative morphology of female specimens and the significantly larger size of females compared to the male.