Blakistonia emmottorum, Harrison & Rix & Harvey & Austin, 2018

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: 36-38

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Blakistonia emmottorum

sp. n.

Blakistonia emmottorum   , sp. n.

( Fig. 12 View FIGURE 12 A–L)

Type material. AUSTRALIA: Queensland GoogleMaps   : Holotype male, Noonbah Station, north of Jundah   GoogleMaps , 24°07’S, 143°11’E, 28 August 1993, hand collected, A.J. Emmott (QMB S29540 View Materials ).

Diagnosis. Males of B. emmottorum   can be distinguished from those of B. maryae   , B. plata   , B birksi   , B. newtoni   , B. hortoni   , B. parva   , B. maryae   , B. olea   , B. tariae   , B. carnarvon   and B. raveni   by the prolateral clasping spurs on tibia I, each with raised cuticular bases and bearing multiple terminal peg-like macrosetae ( Fig. 12 View FIGURE 12 G–I); and from those of B. bella   , B. pidax   , B. tunstilli   , B. gemmelli   , and B. aurea   by the subquadrate (wider than long) eye group ( Fig. 12D View FIGURE 12 ). Females are unknown.

Description. Holotype male (QMB S29540 View Materials ). Small idiopid spider (total length 6.0).

Colour (in ethanol; Fig. 12 View FIGURE 12 A–C): Carapace, legs and pedipalp very pale yellow-brown, darker around caput ( Fig. 12A View FIGURE 12 ); sternum, labium and maxillae lighter golden yellow; chelicerae slightly darker yellow-brown ( Fig. 12E, F View FIGURE 12 ); abdomen even paler yellowish brown with faint chevron pattern posteriorly ( Fig. 12A, C View FIGURE 12 .)

Cephalothorax: Carapace 3.2 long, 2.5 wide, 2.0 high, 1.3 times longer than wide; oval ( Fig. 12A View FIGURE 12 ), caput low, ocular area raised ( Fig. 12C View FIGURE 12 ); cuticle smooth, with pits outward from fovea and both sides of caput; fovea slightly procurved; row of setae between fovea and eye group; carapace sparsely setose, with indistinct lines of setae radiating outwards from fovea, concentrated and form fringe on lateral margins; median clump of thickened setae on clypeus ( Fig. 12D View FIGURE 12 ). Length of median clypeus less than 1.0; anterior margin slightly convex. Eye group 0.7 wide, 0.4 long, 0.3 of carapace width; anterior eye row strongly procurved, PLE–PLE/ALE–ALE ratio 0.9; posterior eye row straight; AME about two-thirds of ALE and separated by less than AME diameter; PLE twothirds size of ALE and separated by about ALE diameter; PME pale, just over half size of PLE, and separated from PLE by less than its own diameter ( Fig. 12D View FIGURE 12 ). Labium without cuspules ( Fig. 12F View FIGURE 12 ). Sternum 2.0 long, 1.3 wide, evenly setose. Maxillae with ca. 6 cuspules on both sides ( Fig. 12E, F View FIGURE 12 ).

Legs: diffusely setose; tarsi I, II ventrally swollen; tarsi I, II weakly scopulate ( Fig. 12 View FIGURE 12 G–I). Paired tarsal claws: leg I p4 (2 large, 2 small) r4 (2 large, 2 small); leg II p5 (2 large, 3 small), r4 (2 large, 2 small); leg III p4 (3 large, 1 small), r4 (2 large, 2 small); leg IV p8 (7 large, 1 small, r4 (2 large, 2 small).

Spination: Tibia I with prolateral clasping spurs, distal-most spur with 2 terminal peg-like macrosetae, proximal-most with 3 terminal peg-like macrosetae ( Fig. 12 View FIGURE 12 G–I). Leg II: metatarsus p1, r5. Leg III: tibia p1, r1; metatarsus p4, r10; tarsus p1, r1. Leg IV: metatarsus p11, r7; tarsus p3, r4.

Leg and pedipalp measurements: Length of legs IV> II> I> III. Leg I: femur 3.3, patella 1.5, tibia 2.5, metatarsus 2.2, tarsus 1.5, total = 11.0. Leg II: femur 3.0, patella 1.0, tibia 2.2, metatarsus 3.0, tarsus 1.1, total = 10.3. Leg III: femur 2.3, patella 1.0, tibia 2.0, metatarsus 2.3, tarsus 1.4, total = 9.0. Leg IV (right): femur 3.8, patella 1.4, tibia 3.4, metatarsus 3.6, tarsus 1.9, total = 14.1. Pedipalp: femur 1.7, patella 1.0, tibia 1.6, tarsus 0.8, total = 5.1.

Pedipalp: Femur with thickened dorsal setae; tibia short and swollen, RTA short, stout, pointed, covered in short, dense spinules that continue for ca. half distance between base of apophysis and distal tibia, becoming more sparse toward distal tibia; long, erect setae ventrally on tibia; bulb uniform, globular; embolus simple, slender, tapering, twisted, slightly longer than bulb; cymbium with sparse rows of short spinules, becoming longer and denser distally ( Fig. 12 View FIGURE 12 J–L).

Abdomen: Setose, oval, dorsal sigilla not evident; 3.0 long, 2.0 wide ( Fig. 12A View FIGURE 12 ).

Variation: None.

Etymology. This species is named in honour of Angus and Karen Emmott, the owners of Noonbah Station and the collectors of the only known specimen of this species.

Distribution. Blakistonia emmottorum   is known only from Noonbah Station in central Queensland ( Fig. 34 View FIGURE 34 ).

Remarks. The specimen was found in a passage between houses at Noonbah Station, in August during rain.