Sisyrnodytes curtus ( Wiedemann, 1819 )

Londt, Jason G. H., 2009, A review of Afrotropical Sisyrnodytes Loew, 1856 (Diptera: Asilidae: Stenopogoninae), African Invertebrates 50 (1), pp. 137-137 : 152-154

publication ID	https://doi.org/ 10.5733/afin.050.0106
persistent identifier	https://treatment.plazi.org/id/FC568798-FFFE-FF81-F7EB-FF7135F3FD8C
treatment provided by	Felipe
scientific name	Sisyrnodytes curtus ( Wiedemann, 1819 )
status

Treatment

Sisyrnodytes curtus ( Wiedemann, 1819) View in CoL View at ENA

Figs 2 View Figs 1–5 , 17, 18 View Figs 13–18 , 43 View Fig

Dasypogon curtus: Wiedemann 1819: 6 View in CoL ; 1821: 229; 1828: 409.

Dasypogon (Acnephalum) curtus: Walker 1854: 458 View in CoL .

Acnephalum curtus: Loew 1860: 72 .

Sisyrnodytes curtus: Schiner 1866: 680 View in CoL ; Oldroyd 1957: 84–85; 1974: 74; 1980: 368 (catalogue).

Dasypogon luscinius Walker, 1849: 360 View in CoL . Syn. n.

Sisyrnodytes luscinius: Oldroyd 1957: 85–86 View in CoL ; 1974: 72; 1980: 368 (catalogue).

Redescription:

Female (based on holotype in fair condition, left mesothoracic leg broken off beyond femur, left metathoracic leg missing terminal four tarsomeres, thorax badly cracked dorsoventrally on left side with resulting damage to pleura, mesonotum and scutellum, left haltere missing it’s knob).

Head: Dark red-brown to black, white, pale yellow and red-brown setose. Antennae: Red-brown except for tip of style which is yellowish. Scape and pedicel mostly pale yellowish setose. Major ventral setae of pedicel not projecting beyond level achieved by postpedicel (setae probably damaged). Basal element of style short (about as long as broad). Eye to face width ratio 1.6:1. Mystax moderately developed, predominantly white except for ventral setae which are dark red-brown. Frons and vertex white setose. Laterally situated frontal setae not extending below antennal sockets. Occipital setae white, postoculars mostly dark red-brown. Palps dark red-brown setose, proboscis white setose.

Thorax: Dark red-brown. Pronotum white setose. Mesonotum entirely setose except for narrow paramedial strips, sutural and postsutural spots. Lateral macrosetae red-brown (npl & sal) and pale yellow (pal), other setae mostly white (there are a few pale brownish ones). Scutellum apruinose, somewhat inflated, with poorly defined transverse groove; disc asetose, 16 apical setae ranging from orange-brown (laterally) to yellowish (medially). Pleural setae white. Katepimeron asetose, katatergals long, shafts more or less smooth proximally, wavy distally. Legs: Red-brown, meso- and metathoracic femora orange anteroventrally, metathoracic tibiae mostly orange. Legs mainly white setose, but there are black setae terminally on tibiae and ventrally on tarsi. Claws longish, dark red-brown; empodia short yellowish, pulvilli moderately developed (longer than empodia and about one-third length of claws). Wings 5.2× 2.2 mm, C white setose basally; membrane weakly pale orange stained basally. Haltere brown-yellow.

Abdomen: Red-brown; terga partly yellow-white setose (these setae mainly laterally situated, but do extend along posterior margins for a short distance).

Male: Similar to female.

Genitalia: The terminalia of a male from ‘ 7 mi. N. Vanrhynsdorp’ were excised, macerated and illustrated ( Figs 17, 18 View Figs 13–18 ). Epandrium reduced and simple in structure, about twice as long as broad in lateral view. Proctiger fairly short. Gonocoxite with suboval external lobe (in lateral view). Internal lobe fairly robust with small inwardly directed hooked tip. Gonostylus short, simple in structure. Hypandrium fairly robust, suboval in ventral view, constricted at about midlength (in ventral view). Aedeagus fairly robust, blunt tipped.

Variation: Wing length ơ 3.1–5.2 mm, ^3.1 –6.2 mm. A fairly variable species with respect to general body and setal coloration. For example, antennae and mystax may be entirely white setose and occiput may lack yellowish macrosetae. Major ventral setae of pedicel usually extend beyond level attained by postpedicel. Leg coloration varies from orange through to dark red-brown, metathoracic legs often paler than others. Wing staining also varies slightly in both intensity and extent.Abdominal coloration variable from almost entirely orange (parts of T1 always dark red-brown) to almost entirely red-brown (lateral parts of terga invariably paler than medial parts).

Holotype (examined): ^SOUTH AFRICA: Western Cape: ‘Cap b. sp. [Cape of Good Hope]’, ‘ Sisyrnod. (Dasy). / curtus / Coll. Winthem’, ‘Type’ [red] ( NHMW). Note: Wiedemann (1821) recorded the species from ‘Prom. bon. sp’ giving the gender as male and the repository as ‘Mus. Westerm. et n.’. Oldroyd (1957) states ‘ Holotype in Copenhagen Museum’, but Thomas Pape (pers. comm.) reports that the species is not represented in that collection. The only specimen likely to be the type is the NHMW female even though Wiedemann (1821) indicated his material as being male.

Other type material examined: SOUTH AFRICA: ^holotype ( luscinius ) ‘Type’ [circular with green rim], ‘Dr. Smith. / S. Afr. 44–6.’, ‘One of Walkers / series so named. / E A W’, ‘ Holotype / Dasypogon / luscinius Walker / det. J.E. Chainey. 1983’ [this label has a circular red rimmed label glued to its upper right hand corner reading ‘Holo- / type’] (BMNH). Notes: The luscinius ^holotype is double mounted on a cellulose strip. Condition: Poor, head detached and glued to mounting strip, both antennae broken off beyond pedicel. The thorax remains on its mounting pin but all the legs are broken off beyond trochanter; one, probably the right prothoracic leg, is glued to the mounting strip and is complete enough to show the condition of the pulvilli. The right wing is missing while the left wing is dirty and has somewhat ragged edges (approx. measurements are 5.0×2.0 mm). The abdomen is detached and glued to the mounting strip. The specimen is sufficiently well preserved to allow comparisons with other specimens. A well preserved female from ‘Knersvlakte, North of Van Rhynsdorp’ agrees very well with the holotype.

Type locality: I here designate the type locality as South Africa, Western Cape, Table Mountain Nat. Park, Olifantsbos [34°14.442'S: 18°23.159'E] GoogleMaps .

Other specimens examined: SOUTH AFRICA: 1 ơ ‘South Africa, Cape Prov / 11mi. [c. 18 km] NNE. Hondeklipbaai / Sept. 8, 1972, 3017Ab, / ME&BJ. Irwin, 200 ft. alt– / Reddish sand, shrubs’ (NMSA); 2 ơ 6^‘ Wallekraal [30°24'S: 17°31'E] / Namaqualand’ ~ ‘Mus., Expd., / Oct. 1950 ’ (SAMC); 1 ơ ‘South Africa, Cape Prov / 7mi. [c. 2 km] N. Vanrhynsdorp / Sept. 10, 1972. M.E. Irwin / 400 ft, 3118Bc, red dunes’ (NMSA); 1^‘ Knersvlakte [31°15'S: 18°45'E] North / of Van Rhynsdorp / South-West Cape / 6–9 October 1964 / B&P Stuckenberg’ (NMSA); 1^‘ S. Afr. C.P. / Koekenaap [Siding, 31°32'S: 18°17'E] / Skaapvlei / 28.ix.76 / V.B. Whitehead’ (SAMC); 3 ơ 9^‘ Olifants River [31°42'S: 18°12'E] / bet. Citrusdal & / Clanwilliam C.P.’ ~ ‘Museum Staff / Oct. – Nov. 1931 ’ (SAMC); 1 ơ ‘South Africa C.P. / Doringbaai 31.44S / 18.14E 17.xi.1984 / C.D. Eardley’ (SANC); 2^‘ Sth Africa: Cape Prov / 34km N Op die Berg / 3219CC 21.xi.1986 / Londt & Quickelberge / Sandy area/grass’ (NMSA); 1 ơ ‘ Cape Province / 11km W of Clanwilliam [32°11'S: 18°54'E] / on road to Graafwater / 1.xi.1989 / F.W. & S.K. Gess’ (AMGS); 1^‘ Leipoldtville [32°13'S: 18°29'E] / - Eland’s Bay / C.P.’ ~ ‘Mus., Exp., / Oct., 1947’ (SAMC); 6 ơ 10^‘ Paleisheuwel [32°28'S: 18°43'E] / C.P.’ ~ ‘Mus., Exp., / Nov. 1948.’ (SAMC); 1 ơ 2^‘ S Africa: Cape #63 / 14km NNW Citrusdal / 32°31'S: 18°58'E 300m / Date: 1.ix.1991 / Coll: J.G.H. Londt / Woody plants; sandy’ (NMSA); 6 ơ 10^‘ Citrusdal [32°35'S: 19°01'E] / Distr.’ ~ ‘Mus. Exp. / Nov. 1948 ’ (SAMC); 3 ơ 3^‘ Sth Africa: W Cape / Gonnemanskraal N of / Jacobsbaai JGH Londt / 32°57'14''S 17°53'07''E / 21–26.xii.2002 0–10m / Dune sand & vegetation’ (NMSA); 1^‘ Cape Province / Worcester. [33°39'S: 19°26'E] / January 1929 ’, ‘S. Africa. / R.E. Turner. / Brit. Mus. / 1929-96’ (BMNH); 1^‘ Capland / Stellenbosch [33°56'S: 18°51'E] / 25 x 1925 / Dr. H. Brauns.’ (NMSA); 1 ơ 1^‘ South Africa: W Cape / Good Hope Farm c. 35km / SW Robertson 380m / 33°59'13''S 19°36'00''E / 22–23.x.2005 JGH. Londt / Protea , Dodonaea fynbos’ (NMSA); 1 ơ ‘Sth Africa: Cape Prov / 10km NE Muizenberg / 3418AB 28.xi.1981 / B.R. Stuckenberg / Coastal Macchia’ (NMSA); 2 ơ 1^‘ Sth Africa: Cape Prov / Brenton on Sea 3423AA / 10.xii.1979 J. Londt / & B. Stuckenberg Dune / & hillside vegetation’ (NMSA); 2 ơ 1^‘ Strandfontein [34°05'S: 18°33'E] / False Bay / 1 Nov. 1960 ’ (SAMC); 1^‘ Strandfontein / March 1950 / Zinn, Hesse’ (SAMC); 2 ơ 2^‘ South Africa: W Cape / Table Mountain Nat. Park / Silvermine 18.x.2006 100m / 34°06.994'S: 018°24.253'E / JGH Londt Skildersgatkop / Trail Sandy fynbos area’ (NMSA); 1 ơ 1^‘ S Africa: Cape #43 / Kommetjie (Hillside) / 34°09'S: 18°20'E 30m / Date: 1.x.1993 / Coll: J.G.H. Londt / Macchia: Sandy area’ (NMSA); 6 ơ 4^‘ South Africa: W Cape / Table Mountain Nat. Park / Olifantsbos 16.x.2006 20m / 34°14.442'S: 018°23.159'E / JGH Londt Sandy hillside / fynbos area with flowers’ (NMSA); 1 ơ 2^‘ South Africa / Cape Town - / Cape Point [34°21'S: 18°29'E], / xi.1930 / H.N. Simmonds’ (BMNH); 1 ơ ‘Still bay. [Stilbaai, 34°23'S: 21°27'E] C.P. / 9–12–xi– 1940 / G. van Son’ (NMSA); 33 ơ 39^‘ Pearly Beach [34°40'S: 19°30'E] / Bredasdorp’ ~ ‘S.A.M. / 12:58 [xii.1958]’ (SAMC).

Distribution, phenology and biology: This species is a South African endemic found in the winter-rainfall areas of the Western Cape Province ( Fig. 43 View Fig ). Adults are active from spring to autumn (i.e. September–March (no February record)) (Table 1). Label data indicate that the species is found predominantly in sandy places (e.g. vegetated dunes and similar situations) with fynbos vegetation. Personal experience suggests that individuals rest on open sand in places where there are plants to provide some shade and protection from wind, and that population levels may be locally fairly high.

Similar species: This species is distinctive and not easily confused with others. The pulvilli are not minute, and although small (almost as long as the empodia and about one third the length of claws), are distinct.