Plesianthidium (Spinanthidium) calvini Cockerell
Creators: name: Eardley, Connal
name: Griswold, Terry
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Megachilidae
Plesianthidium
Plesianthidium calvini

description: 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).
description: Published as part of Eardley, Connal & Griswold, Terry, 2015, Taxonomic revision of Plesianthidium Cameron (Apoidea: Megachilidae: Anthidiini), an endemic southern African bee genus, pp. 1-56 in Zootaxa 3973 (1) on pages 52-53, DOI: 10.11646/zootaxa.3973.1.1, http://zenodo.org/record/288925