Hogna isambertoi Crespo, 2022
Crespo, Luis C., Silva, Isamberto, Enguidanos, Alba, Cardoso, Pedro & Arnedo, Miquel, 2022, Island hoppers: Integrative taxonomic revision of Hogna wolf spiders (Araneae, Lycosidae) endemic to the Madeira islands with description of a new species, ZooKeys 1086, pp. 84-135 : 84
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|Hogna isambertoi Crespo|
Hogna isambertoi Crespo sp. nov.
Hogna heeri Crespo et al. 2013: 18 (m, misidentification).
Holotype: Deserta Grande • 1 ♂, Ponta Sul, 32.49562°N, 16.49562°W, coll. 4.XI.2017, leg. I. Silva, stored at SMF, collection number to be set after publication. Paratypes: Bugio • 1 ♂ (SMF), Planalto Sul, 3.XII.2012, hand collecting, leg. I. Silva. Deserta Grande • Planalto Sul, 1 ♀ (SMF), 12.XI.2017, hand collecting, leg. I. Silva.
Deserta Grande • Planalto Sul, 1 juvenile (CRBALC0610: LC330), 12.XI.2017, hand collecting, leg. I. Silva.
Hogna isambertoi sp. nov. can be distinguished from all other Madeiran Hogna by its genitalia. In males, the embolus is thick and tilted anteriorly at the tip and a tegular apophysis with a very short ventral spur (Fig. 18A, C View Figure 18 ). In females, the epigynal anterior pockets show convergent lateral borders and the median septum has a wide posterior transverse part (Fig. 18D View Figure 18 ). It is most similar to H. heeri and H. insularum , from which it cannot be somatically differentiated.
Colour: carapace greyish brown, covered with short black setae, with a median yellow longitudinal band, anteriorly broadened, covered with short white setae; two yellow marginal bands, suffused with grey patches, covered with short white setae; four black striae well visible on each flank. Chelicerae yellow, with grey suffused patches, covered in black and white setae. Gnathocoxae and labium overall pale yellow, with posterior margin with suffused grey patch; sternum pale yellow, with V-shaped grey patch. Legs pale yellow, with irregular grey suffused patches, except anterior metatarsi and tarsi, yellowish orange. Pedipalps yellow. Abdomen with a pair of anterolateral black patches, extending laterally into grey to black flanks; a median faint dark lanceolate patch is bordered by two yellowish longitudinal bands interconnected in anterior half, posteriorly by means of dark chevrons; venter yellowish, with large blackish patches near spinnerets and small patches medially.
Eyes: MOQ: MW = 0.8 PW, MW = 1.1 LMP, MW = 1.1 AW; Cl = 0.5 DAME. Anterior eye row slightly procurved.
Legs: Measurements: Leg I: 11.7, TiI: 2.6; Leg IV: 13.8, TiIV: 2.8; TiIL/D: 6.6. Spination of Leg I: FeI: d1.1.1, p0.0.1; TiI: p1.0.1, v2l.2l.2s; MtI: p0.0.1, r0.0.1, v2l.2l.1s. MtI with sparse scopulae in basal half and dense scopulae on distal half.
Pedipalp: cymbium with one spine along prolateral rim and five dark, stout, macrosetae at tip, Fe with two dorsal and an apical row of four spines. Tegular apophysis with ventral spur very short, blunt, with a concave ridge leading to a thin apical point (Fig. 18A, B View Figure 18 ); terminal apophysis in close apposition with subterminal apophysis, which is blade-shaped with blunt end (Fig. 18A, C View Figure 18 ); embolus long and thick, with tip tilted anteriorly (Fig. 18A View Figure 18 ); palea large (Fig. 18A View Figure 18 ).
Colour: overall as in male, but darker in legs, chelicera and prosoma, where additional faint striae are present. Abdomen is lighter, with central chevrons faded, possibly due to pregnancy and correspondent tegument extension.
Eyes: MOQ: MW = 0.8 PW, MW = 1.2 LMP, MW = 1.8 AW; Cl = 0.4 DAME. Anterior eye row slightly procurved.
Legs: Measurements: Leg I: 9.9, TiI: 1.7; Leg IV: 13.0, TiIV: 2.6; TiIL/D: 3.2. Spination of Leg I: FeI: d1.1.0, p0.0.1-2; TiI: p0.0.0-1, v2l.2l.2s; MtI: p0.0.1, r0.0.1, v2l.2l.1s. MtI with sparse scopulae in basal half and dense scopulae on distal half.
Epigyne: anterior pockets touching, short, with lateral borders parallel (Fig. 18D View Figure 18 ); anterior pocket cavities deep; median septum with wide posterior transverse part (Fig. 18D View Figure 18 ); spermathecae oval (Fig. 18E View Figure 18 ); copulatory ducts simple (Fig. 18E View Figure 18 ); fertilisation ducts emerging at the base of copulatory duct (Fig. 18E View Figure 18 ).
the specific epithet is a patronym in honour of Isamberto Silva, who not only collected the only known specimens of this species, but has provided invaluable support during field work.
Carapace length, males: 4.1-4.3.
This species is known only from the southernmost part of Deserta Grande and Bugio (Fig. 20 View Figure 20 ).
Hogna isambertoi sp. nov. occurs in arid, coastal scarps, with reduced vegetation cover.
the species seems to be restricted to a very small area, equivalent to an Extent of Occurrence and Area of Occupancy of 8 km2 in two locations, both threatened by the effects of increasing aridification. The trends are unknown, but it is uncertain if the scarcity of specimens is due to rarity, or the fact that it seems to be a late autumn / early winter species, when collecting effort has been low. If the decline is confirmed the status might be Endangered, if not it might be Near Threatened.
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