Jocquestus roeweri ( Lawrence, 1938 ) Lyle & Haddad, 2018

Lyle, Robin & Haddad, Charles R., 2018, Jocquestus, a new genus of trachelid sac spiders from the Afrotropical Region (Arachnida: Araneae), Zootaxa 4471 (2), pp. 309-333 : 324-326

publication ID

https://doi.org/ 10.11646/zootaxa.4471.2.4

publication LSID

lsid:zoobank.org:pub:691AD8B9-27BB-40E6-A3D8-C3D17DA38B0B

DOI

https://doi.org/10.5281/zenodo.5949515

persistent identifier

https://treatment.plazi.org/id/0772878D-041E-FFFB-FF45-F8EEFA9C6A90

treatment provided by

Plazi

scientific name

Jocquestus roeweri ( Lawrence, 1938 )
status

comb. nov.

Jocquestus roeweri ( Lawrence, 1938) comb. nov.

Figs 17, 18 View FIGURES 9–20 , 61–65 View FIGURES 61–64 View FIGURES 65–69

Trachelas roeweri Lawrence, 1938: 502 , fig. 27 (Holotype ♀: SOUTH AFRICA: KwaZulu-Natal: Nkhandla [28°37'S, 31°05'E], leg. R.F. Lawrence, I.1937, NMSA 1383 About NMSA —examined). GoogleMaps

Remark. The female holotype is quite faded and damaged, with several legs missing ( Fig. 18 View FIGURES 9–20 ). To avoid further damage to the specimen we did not dissect the epigyne, and only the ventral view is presented in the description, as no fresh material was available for study. We matched the male and female of J. roeweri comb. nov. based on the fact that they were the only other species of Jocquestus other than J. schenkeli comb. nov. occurring in northern KwaZulu-Natal, and that they were recorded in savanna habitats from localities approximately 70 km apart.

Diagnosis. Males of J. roeweri comb. nov. share with J. incurvus sp. nov. and J. capensis sp. nov. a RPA extending to the end of the palpal tibia ( Fig. 63 View FIGURES 61–64 ), but the former species has a nearly perpendicular bend in the embolus ( Fig. 53 View FIGURES 52–55 ), absent in J. roeweri comb. nov., and the latter has four strong spines at the distal end of the cymbium ( Fig. 42 View FIGURES 41–46 ), which are absent in J. roeweri comb. nov.. The female of J. roeweri comb. nov. can be recognised by the combination of the ST I that are bilobed in ventral view, and the ST II that are narrower posteriorly than anteriorly, with a narrow ovoid space separating them along their mesal margins ( Fig. 64 View FIGURES 61–64 ).

Male (Eshowe, NMSA 12114). Measurements: CL 1.70–1.80, CW 1.50–1.55, AL 1.80–2.00, AW 1.45–1.55, TL 3.50–3.70, FL 0.10–0.13, SL 0.98–1.00, SW 0.83–0.88, AME–AME 0.08, AME–ALE 0.08, ALE–ALE 0.43, PME–PME 0.15, PME–PLE 0.20, PLE–PLE 0.75.

Length of leg segments (sequence from femur to tarsus, and total): I 1.25 + 0.65 + 0.88 + 0.63 + 0.38 = 3.79; II 1.10 + 0.53 + 0.83 + 0.70 + 0.38 = 3.54; III 0.85 + 0.38 + 0.48 + 0.65 + 0.28 = 2.64; IV 1.03 + 0.43 + 0.75 + 0.85 + 0.30 = 3.36.

Carapace reddish-brown ( Fig. 17 View FIGURES 9–20 ); surface finely wrinkled, covered with short fine setae; fovea short, fine, distinct, at two thirds CL. Ocular region brown to dark brown, with black rings surrounding eyes; clypeus height equal to approximately 1.5 times AME diameter; AME and ALE equal in size; AME separated by distance equal to 0.5 their diameter; AME separated from ALE by distance equal to 0.75 AME diameter; PME and PLE equal in size; PME separated by distance equal to twice their diameter; PME separated from PLE by distance more than twice PME diameter. Chelicerae brown, anterior surface with scattered long fine setae; three promarginal teeth, median tooth largest, distal tooth smallest; two retromarginal teeth, distal tooth largest. Sternum brown, darker towards borders; surface finely granulate, with scattered short fine setae. Abdominal dorsum brown to mottled grey, with scutum covering almost entire length of abdomen; two pairs of sigilla present, first pair pale brown, anterior to midpoint, second pair darker, posterior to midpoint ( Fig. 17 View FIGURES 9–20 ). Legs I to IV uniform brown, anterior legs slightly darker than posterior legs; leg spination: tibiae: I plv 5 cusps; metatarsi: I plv 5 cusps; tarsi: I plv 1 cusp ( Fig. 61 View FIGURES 61–64 ). Palp brown; RPA long, extending to end of palpal tibia, curved ventrally, with truncated tip in retrolateral view; palpal tibia without RTA; embolus originating prolaterally at tegulum base, curving prolaterally along tegulum, narrowing gradually to sharp tip retrolaterally near cymbium tip ( Figs 62, 63 View FIGURES 61–64 ).

Female (holotype, Nkhandla, NMSA 1383). Measurements: CL 1.05–1.95, CW 0.88–1.68, AL 1.35–1.95, AW 1.10–1.60, TL 2.30–4.10, FL 0.05, SL 1.10, SW 0.98, AME–AME 0.05, AME–ALE 0.01, ALE–ALE 0.40, PME–PME 0.15, PME–PLE 0.15, PLE–PLE 0.73.

Length of leg segments (sequence from femur to tarsus, and total): I 1.28 + 0.65 + 0.73 + 0.78 + 0.45 = 3.89; II 1.15 + 0.58 + 0.83 + 0.75 + 0.43 = 3.74; III 0.88 + 0.38 + 0.60 + 0.65 + 0.30 = 2.81; IV 1.15 + 0.48 + 0.88 + 0.83 + 0.33 = 3.67.

Carapace orange ( Fig. 18 View FIGURES 9–20 ). Ocular region orange, with pale brown rings around eyes; clypeus height equal to AME diameter; ALE slightly larger than AME; AME separated by distance slightly less than their diameter; AME separated from ALE by distance equal to AME diameter; PLE slightly larger than PME; PME separated by distance equal to 1.2 times PME diameter; PME separated from PLE by distance equal to PME diameter. Chelicerae orange, slightly paler at fang base; three promarginal teeth, median tooth largest, proximal tooth smallest; two retromarginal teeth, proximal tooth largest. Abdomen grey dorsally, with bright yellow scutum covering most of dorsum; three paired pale markings, first anteriorly, second in front of midpoint, third smaller, posterior to midpoint, all separated by median and transverse grey lines; two pairs of sigilla present, first at onequarter abdomen length, second at midpoint ( Fig. 18 View FIGURES 9–20 ). Leg I orange, II slightly paler, III and IV pale yellow, femora slightly darker than other segments. Other characters as for male. Epigastric region sclerotised, yellow; epigynal ridges at 45° angle to epigastric fold, with lateral copulatory openings; ST narrower basally than anteriorly, anterior part forming rounded head; narrow median ducts connecting ST II to bilobed ST I near epigastric furrow ( Fig. 64 View FIGURES 61–64 ).

Other material examined. SOUTH AFRICA: KwaZulu-Natal: Eshowe , 28°54'S, 31°28'E, leg. L. Bevis, XI– XII.1943, 1 ♂ ( NMSA 12114 About NMSA ) GoogleMaps ; Eshowe, Dlinza Forest , 28°53'S, 31°27'E, leg. P. Reavell, 17.I.1984 (sweeping herbs), 1♂ ( NMSA) GoogleMaps .

Distribution. Known only from northern KwaZulu-Natal Province, South Africa ( Fig. 70 View FIGURE 70 ).

Habitat and biology. A rare species sampled from savanna and Indian Ocean coastal belt forest habitats.

NMSA

KwaZulu-Natal Museum

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Corinnidae

Genus

Jocquestus

Loc

Jocquestus roeweri ( Lawrence, 1938 )

Lyle, Robin & Haddad, Charles R. 2018
2018
Loc

Trachelas roeweri

Lawrence, 1938 : 502
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