Andrena (Micrandrena) acuta WARNCKE , 1968

Kratochwil, Anselm & I, Canary, 2020, Revision of the Andrena wollastoni group (Hymenoptera, Anthophila, Andrenidae) from the Madeira Archipelago and the Canary Islands: upgrading of three former subspecies and a description of three new subspecies, Linzer biologische Beiträge 52 (1), pp. 161-244 : 171-174

publication ID	https://doi.org/ 10.5281/zenodo.5273217
persistent identifier	https://treatment.plazi.org/id/D91C87FC-FFEC-B161-FF2A-896DF08AE124
treatment provided by	Marcus
scientific name	Andrena (Micrandrena) acuta WARNCKE , 1968
status

Treatment

Andrena (Micrandrena) acuta WARNCKE, 1968 View in CoL

Syn. Andrena wollastoni acuta WARNCKE, 1968

S t a t u s: WARNCKE (1968) described A. w. acuta as endemic to Tenerife, La Gomera, and La Palma. He defined 29 types (holotype, paratypes) of A. w. acuta (Tenerife: 6♂♂, 19♀♀; La Palma: 2♂♂ males; La Gomera: 2♂♂). This is in accordance with BLANK & KRAUS (1994) in their catalogue of all taxa of bees described by Warncke. Later, Warncke designated the specimens found on La Gomera to a subspecies on its own (A. w. gomerensis WARNCKE, 1993 ). The distribution of A. w. acuta is restricted to Tenerife and La Palma (according to WARNCKE 1993).

In the OLML the holotype and nine paratypes (7♀♀, 3♂♂), in the MNCN seven paratypes (7♀♀, also mentioned by IZQUIERRO & MARTÍN 2010), and in the ZSM one paratype (1♂) are deposited (for information on the specimens, see taxa description of A. a. acuta ). All these types could be analysed in the OLML, MNCN, and ZMS. These specimens are all provided with a determination label from Warncke.

The deposition of eleven paratypes (5♀♀, 6♂♂) could not be verified. These following specimens are not in the OLML, the MNCN or the ZMS: 1♀ Costa de Santa Cruz, 02.04.1899, collector unknown; 1♀ Bajamar, 12.03.1903, collector unknown; 1♀ El Chorrillo, 20.03.1903, collector unknown; 1♀ Bajamar, 16.05.1904, collector unknown; 1♀ Granadilla, 26.02.1950, leg. Lindberg; 1♂ Tenerife, Valle de Jiménez, 02.02.1899, collector unknown; 1♂ Laguna, 03.05.1921, collector unknown (collection Cabrera). With one exception (locality Granadilla), these specimens have been exclusively detected in the Anaga region. Further five specimens (no paratypes) were found in the OLML (three of them originated from the UMBB). The location of the following four paratypes designated by Warncke is also unknown: 2♂♂ previously dedicated by WARNCKE (1968) as paratypes of A. w. acuta for La Gomera (1♂ Isla de la Palma, 1907, leg. Santos; 1♂ supra El Paso, 600 m, 04.04.1950, leg. Lindberg), and 2♂♂ previously dedicated by WARNCKE (1968) as paratypes of A. w. acuta for La Gomera (El Cedro, ca. 1000 m, 23.03.1950, leg. Lindberg).

The former A. w. acuta WARNCKE, 1968 , is now A. acuta WARNCKE, 1968 . A. acuta WARNCKE, 1968 , becomes the nominal taxon A. a. acuta WARNCKE, 1968 . 13♀♀ and 3♂♂ of the type series of WARNCKE (1968) correspond to the newly designated A. a. acuta WARNCKE, 1968 . 1♀ and 1♂ of the type series of WARNCKE (1968) will be assigned to A. a. wildpreti nov.ssp. (see the characterisation of the subspecies).

F o r m e r d e s c r i p t i o n s: WARNCKE (1993) characterised A. w. acuta as follows (translated from German): ‘Differences to the nominal taxon: labrum process narrower, triangular and acuminate instead of trapezoidal. Puncturing of the thorax lightly stronger. Abdomen much more shagreened and therefore dull. First tergite laterally slightly carinate (similar to A. strohmella STÖCKH. ). Wing veins brighter.’ This characterisation was adopted by GUSENLEITNER & SCHWARZ (2002).

D i a g n o s t i c q u a l i t a t i v e f e a t u r e s: Inadditiontothemorphological characteristics that are typical for the taxa of the A. wollastoni group, A. acuta is characterised by the following specific features:

F e m a l e: Colour. Head: flagellum black (67%) or dark brown (33%) ( Figs. 3a, c, d View Fig ). Mesosoma: femur, tibia, and basitarsus black or dark brown; mediotarsi reddish-brown ( Fig. 4e View Fig ); wings brownish toned ( Fig. 3a View Fig ), veins reddish-brown; pterostigma dark yellowish or reddish-brown. Metasoma: T1-4 black with black to dark reddish-brown depression zone ( Fig. 3f View Fig ); T5 depression zone reddish-brown.

Pubescence. Head: clypeus and supraclypeal area with yellowish-white not dense hairs ( Fig. 3c View Fig ); paraocular area with yellowish-white hairs and many brownish (black) hairs between subantennal socket and facial fovea; scapus and antennal socket, dorsally with longer brownish hairs, ventrally with shorter yellowish hairs; genal area with yellowishwhite hairs; facial fovea in the upper part with brownish hairs, in the lower part with yellowish hairs ( Figs. 3d View Fig , 4a View Fig ); vertex behind the ocelli with longer yellowish-white and brownish hairs ( Fig. 3d View Fig ). Mesosoma: mesoscutum and scutellum with yellowish-brownish hairs, in some cases laterally with some yellowish hairs ( Fig. 3e View Fig ); mesepisternum with yellowish-white hairs; propodeal corbicula with yellowish-white hairs and with some hairs in the centre (rarely white hairs); trochanteral and femoral flocculus well developed with yellowish-white hairs; tibial scopa dorsal with slightly brownish hairs, dorsobasally with reddish-brown hairs, ventrally with yellowish-white hairs ( Fig. 4e View Fig ). Metasoma: tergites scarcely hairy; T2 and T3 (T4) laterally with yellowish-white, fragmentary open hair bands or with dense rows of hairs; T4 with row of hairs between the tergite and the tergite depression, but T2-T4 with fragmentary row of hairs between the tergite and the tergite depression ( Fig. 3a View Fig ); T5 laterally with dense white or yellowish-white hairs, in the centre with reddish-brownish hairs, reaching to the pygidium ( Fig. 3f View Fig ); T6 with dark brown to brown hairs.

Structure. Head: clypeus convex without impunctate line, clearly shagreened, slightly dull, shallow more or less densely punctured (PD: 28 μm, PDI: 14-56 μm) ( Fig. 4b View Fig ); labrum process triangular-trapezoidal, triangular or liguliform, slightly rounded on the top, laterally more or less oblique. Mesosoma: scattered punctured with very shallow punctures, especially in the front (PD: 14-28 μm) ( Fig. 4c View Fig ); propodeum rugose, primarily in the basal centre and in the dorsolateral area, other area fine-grained shagreened ( Fig. 4d View Fig ).

Metasoma: tergites hammertone-like shagreened and shiny ( Fig. 4f View Fig ); T1 with no depression zone or only with a slight depression zone; T2-T4 with deep depression zones, shallow and very scattered but not clearly punctured (PD: 14 μm).

M a l e: similar to female with following differences: Colour. Head: distal half of the mandible not or slightly reddened; flagellum (light) brown ( Fig. 5c, d View Fig ). Mesosoma: wings lightly brownish toned ( Fig. 5a View Fig ); pterostigma yellowish in the centre, reddish-brown marginated.

Pubescence. Head: clypeus with yellowish-white and with darker hairs at the base ( Figs. 5d View Fig , 6a View Fig ); genal area upper part with long brownish hairs ( Fig. 5d View Fig ), lower part with long white-yellowish hairs. Mesosoma: mesepisternum with long yellowish-white hairs. Metasoma: base of T1 with some white-yellowish hairs, scarcely hairy in the centre, T2- T4 depression zones laterally with yellowish-white very fragmented hair bands or dense rows of hairs; T5, T6 with yellowish or with yellowish-reddish hairs ( Fig. 5f View Fig ); ST 8 with long yellowish hairs at the end.

Structure. Head: vertex above the ocelli narrow, as wide as the ocellar diameter; clypeus in the front deeper, in the centre, the base, and (partly) laterally shallow, and not densely punctured (PD: 28 μm, PDI: 14-28 μm) ( Fig. 6b View Fig ); labrum process trapezoidal, emarginated, ends left and right side slightly thickened. Mesosoma: very scattered punctured (PD: 14 μm); Metasoma: T1 carinate; tergites very scattered punctured (PD: 14 μm).

S u b s p e c i e s d i f f e r e n t i a t i o n: A. acuta can be differentiated into three subspecies with limited distribution to Tenerife: A. a. acuta WARNCKE, 1968 (Anaga region), A. a. tenoensis nov.ssp. (Teno region), and A. a. wildpreti nov.ssp. (Dorsal Rift region). Morphological differences exist in the labrum structure and the colouration of the flagellum as well as in morphometric parameters.