Plesianthidium (Spinanthidium) calvini (Cockerell)

Eardley, Connal & Griswold, Terry, 2015, Taxonomic revision of Plesianthidium Cameron (Apoidea: Megachilidae: Anthidiini), an endemic southern African bee genus, Zootaxa 3973 (1), pp. 1-56 : 52-53

Plesianthidium (Spinanthidium) calvini (Cockerell)

( Figs 32–34 )

Anthidium calvini Cockerell, 1932: 525 –526 (holotype—‘♀ type … Cape Province: Calvinia (type-locality), f#, Nov. 12 (J.O.), Nov. 13 (W.P.C., A.M.). Male from near Oudtshoorn, Nov. 1 (J.O.)’ (NHML, examined) South Africa).

Dianthidium calvini: Cockerell 1935: 346 .

Spinanthidium (Spinanthidium) calvini: Pasteels 1969: 59 .

Plesianthidium (Spinanthidium) calvini: Gess & Gess 2006: 9 .

Discussion. Plesianthidium calvini was incorrectly synonymized with P. volkmanni by Pasteels (1984: 129). They belong to different subgenera.

Diagnosis. Both sexes of P. calvini are distinguished from all other Plesianthidium , except P. bruneipes by the combination of distal margins of terga orange, legs partly red including all of tarsi, and terga with distal pubescent bands (best seen in lateral view) ( Figs 32 a, c). Females differ from P. bruneipes in the smaller size (body length ≤ 10 mm), black mandibles, T6 with distinct shoulders, and femora and tibiae partly black. Males differ in the yellow clypeus ( Fig. 32 d) and smaller size (body length ≤ 10 mm).

Plesianthidium calvini is similar to P neli and P. namaquaense but differs in the red legs, and occasionally orange mandibles. The male terminalia of P. calvini and P. n el i are only slightly different.

Description. Female. Lengths: face 2.7–3.1 mm; scutum 2.0– 2.3 mm; forewing 6.3–7.4 mm; body 7.5–10.0 mm. Integument black, except tegula, distal margins of T1–T5, parts of femora, tibiae and usually all tarsi orange ( Fig. 32 a). Pubescence white, except vertex and scutum orangish ( Figs 32 a, b) and scopa pale yellow. T2–T5 with weakly developed distal fasciae (best seen in lateral view). Preoccipital ridge rounded; distance between lateral ocellus and preoccipital ridge 1.5x ocellar diameter; supraclypeus convex; clypeus gently convex, ventral region not modified, ventral edge crenulate, sparsely punctate, shiny between punctures ( Fig. 32 b); mandible with two distinct teeth and three small teeth; maxillary palpus 2-segmented; scutum densely punctate, shiny between punctures; tegula sparsely punctate medially; propodeum glabrous medioventrally; T2–T3 punctate distally; T6 weakly shouldered, not expanded laterally, without mediolongitudinal carina.

Male. Lengths: face 2.5–3.0 mm; scutum 1.9–2.5 mm; forewing 6.3–8.4 mm; body 7.0–10.0 mm. Integument black, except tegula, distal margins of T1–T6, parts of femora, tibiae and tarsi orange ( Fig. 32 c). Pubescence white, except vertex and scutum orangish ( Figs 32 c, d). T2–T5 with weakly developed distal fasciae (best seen in lateral view) ( Fig. 32 c). Preoccipital ridge rounded; distance between lateral ocellus and preoccipital ridge twice ocellar diameter; supraclypeus distinctly convex; clypeus distinctly convex, densely punctate; mandible with three distinct teeth; maxillary palpus 2-segmented; scutum densely punctate medially, dull between punctures; tegula densely punctate; propodeum mostly punctate; hind trochanter without ventral spine; T6 without mediolongitudinal carina, with large posteromedially tubercle, with distinct lateral spines ( Fig. 33 a), without impunctate distal margin, without distal flange; T7 posterior edge tridentate with moderately large lateral and median teeth, all spines narrow, median blunt, lateral pointed ( Figs 33 a, b); S4 without apicomedian comb; S5 posterior edge shallowly concave; S6 broadly convex ( Fig. 33 c); S7 disc short, with broad, posterior concavity ( Fig. 33 d); S8 with disc long, strongly concave posterolaterally, truncate posteromedially, sides straight ( Fig. 33 e); gonostylus concave apicolaterally ( Fig. 33 f).

Distribution ( Fig. 34 ). Namaqualand, South Africa is the only area where this species occurs.

Material examined. Type material. Female holotype of Anthidium calvini : ‘Calvinia C.P. Nov. 13 A.M., Dianthidium calvini Ckll. TYPE, B.M. 1932-324 T.D.A. Cockerell, Type, B.M. TYPE HYM. 17a 1925, BMNH (E) #970310’, in NHML.

Additional material. South Africa. Springbok, 29.6606S 17.8936E, 1966. ix.7, C.D. Michener, Spinanthidium calvini Ckll. J. Pasteels det. 1978 (3♂ BLCU 724871, 724936); Goegap Nature Reserve, 29.9787S 19.37832E, 1985. viii.20, M. Struck (2♀ BLCU 724938, SANC 04044); idem, 1987. x.16, T.L. Griswold (2♀ 1♂ SANC 04039); Concordia, 10 km N, 29.28S 17.57E, 2008. x.15, C. Eardley (1♂ SANC 19305); Dassiefontein farm, 1990. x.1, C.D.

Eardley (8♀ SANC 04032); Nieuwoudtville, 7 km W, 31.3766S 19.0193E, F.D. Parker M.E. Irwin (2♂ BLCU 724946, 724929); Remhoogte, 30.2351S 18.16536E, 2003. x.8, M. Kuhlmann (1♀KC); Leliefontein, 30.2317S 18.1626E, 2002. x.7–14, 2003. ix. 23, C. Mayer (3♀ 1♂ KC); Witwater, 30.2319S 18 13524E, 2003. ix.23, 2003. x.1, C. Mayer (1♀KC); Biedouw Valley, 2011. ix.23, L. Packer (2♀PC 15280 D11, D10); Clanwilliam, 25 km NW Skurfkop Road, 32.0558S 18.6724E, T. Griswold (2♂ BLCU 722954, 722970); Sutherland, 5 km N, 32.3494S 20.6694E, 2004. x.4–24, M.E. Irwin F.D. Parker (1♂ FDP 751431).

Figures

FIGURE 32. Plesianthidium (Spinanthidium) calvini (Cockerell), a – b. Female. a. Habitus. b. Face. c – d. Male. c. Habitus. d. Face.

FIGURE 33. Plesianthidium (Spinanthidium) calvini (Cockerell), male. a. T 6 – T 7. b. T 7. c. S 6. d. S 7. e. S 8. f. Genitalia.

FIGURE 34. Known distribution of Plesianthidium (Spinanthidium) calvini (Cockerell).