Blakistonia plata, 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: 59-60

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Blakistonia plata

sp. n.

Blakistonia plata   , sp. n.

( Fig. 24 View FIGURE 24 A–L)

Type material. AUSTRALIA: Queensland: GoogleMaps   Holotype male, Texas   GoogleMaps , 28°52’0.01”S, 151°10’0.12”E, 24 November 1996, found in tree clearing, T.B. Churchill (QMB S48356 View Materials ).

Diagnosis. Males of B. plata   can be distinguished from those of B. bella   , B. pidax   , B. tunstilli   , B. emmottorum   , B. gemmelli   , and B. aurea   by the absence of prolateral clasping spurs on tibia I ( Fig. 24 View FIGURE 24 G–I); from those of B. parva   , B. olea   , B. tariae   , B. carnarvon   and B. raveni   by the presence of one, rather than two, prolateral macroseta on tibia I ( Fig. 24 View FIGURE 24 G–I); from those of B. maryae   , B. hortoni   and B. newtoni   by a subquadrate eye group ( Fig. 24D View FIGURE 24 ); and from those of B. birksi   by the absence of cuspules on the maxillae ( Fig. 24F View FIGURE 24 ) and by the absence of a strongly patterned abdomen ( Fig. 24A View FIGURE 24 ). Females are unknown.

Description. Holotype male (QMB S48356 View Materials ). Small idiopid spider (total length 9.3).

Colour (in ethanol; Fig. 24 View FIGURE 24 A–C): Carapace very pale yellow-brown, darker around caput ( Fig. 24A View FIGURE 24 ); sternum pale yellow, darker towards anterior and lateral margins; labium and maxillae pale yellow, chelicerae pale orangebrown ( Fig. 24E, F View FIGURE 24 ); abdomen pale yellow-brown with only a faint chevron pattern towards anterior end ( Fig. 24A, C View FIGURE 24 ); legs and pedipalp very pale yellow-brown ( Fig. 24 View FIGURE 24 G–L).

Cephalothorax: Carapace 4.0 long, 3.5 wide, 3.1 high, 1.1 times longer than wide; oval ( Fig. 24A View FIGURE 24 ), caput low, ocular area raised ( Fig. 24C View FIGURE 24 ); cuticle smooth, with pits outward from fovea and both sides of caput; fovea straight; row of setae between fovea and eye group; carapace very 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. 24D View FIGURE 24 ). Length of median clypeus less than 1.0; anterior margin slightly convex. Eye group 0.9 wide, 2.2 long, 0.3 of carapace width; anterior eye row strongly procurved, PLE–PLE/ALE–ALE ratio 1.0; posterior eye row straight; AME equal in size to ALE and separated by less than the diameter of AME/ALE; PLE two-thirds of ALE and separated by about ALE diameter; PME pale, just over half the size of PLE, and separated from PLE by less than its own diameter ( Fig. 24D View FIGURE 24 ). Labium without cuspules ( Fig. 24F View FIGURE 24 ). Sternum 2.2 long, 1.6 wide, evenly setose; sigilla indistinct ( Fig. 24E View FIGURE 24 ). Maxillae without cuspules ( Fig. 24E, F View FIGURE 24 ).

Legs: diffusely setose and spinose on all surfaces, more setose on ventral tibiae, metatarsi and tarsi III, IV; tarsi I, II slightly ventrally swollen; tarsi I, II weakly scopulate ( Fig. 24 View FIGURE 24 G–I). Paired tarsal claws: right leg I p5 (4 large, 1 small) r6 (3 large, 3 small); right leg II p4 (3 large, 1 small), r4 (2 large, 2 small); right leg III p3 (2 large, 1 small), r4 (2 large, 2 small); right leg IV p5 (3 large, 2 small, r5 2 (3 large, 2 small).

Spination: Tibia I with single prolateral macroseta ( Fig. 24 View FIGURE 24 G–I). All legs diffusely setose and spinose, without clear demarcation between lanceolate setae and smaller spine-like setae.

Leg and pedipalp measurements: Length of legs IV> I> II> III. Leg I: femur 4.2, patella 2.1, tibia 3.2, metatarsus 4.5, tarsus 1.7, total = 15.7. Leg II: femur 4.0, patella 2.0, tibia 2.9, metatarsus 4.5, tarsus 1.7, total = 15.7. Leg III: femur 3.4, patella 1.7, tibia 2.3, metatarsus 2.8, tarsus 1.7, total = 11.9. Leg IV: femur 4.4, patella 1.9, tibia 4.1, metatarsus 4.7, tarsus 2.1, total = 17.2. Pedipalp: femur 2.1, patella 1.2, tibia 1.9, tarsus 0.9, total = 6.1.

Pedipalp: Femur with dorsal spines, patella with thickened ventral setae; tibia very short and swollen, RTA short and very pointed, covered in short, dense spinules for ca. half distance between base of apophysis and distal tibia, becoming more sparse towards distal tibia; long, erect setae on ventral tibia; bulb uniform, globular; embolus simple, slender, tapering, tip slightly twisted, just over the length of bulb; cymbium covered in rows of spinules of moderate length, becoming longer and denser towards distal edge ( Fig. 24 View FIGURE 24 J–L).

Abdomen: Abdomen setose, oval, dorsal sigilla not evident; 5.3 long, 3.4 wide ( Fig. 24A View FIGURE 24 ).

Variation: None.

Etymology. The specific name is taken from the Latin plata   (meaning ‘silver’), in reference to the silver mining industry in Texas, Queensland.

Distribution. Blakistonia plata   is known only from Texas, in south-eastern Queensland ( Fig. 34 View FIGURE 34 ).

Remarks. This male specimen was found in a tree clearing.