Colletes imbricatus Ferrari, 2019

Ferrari, Rafael R., 2019, A revision of Colletes Latreille (Hymenoptera: Colletidae: Colletinae) from Brazil, Paraguay and Uruguay, Zootaxa 4606 (1), pp. 1-91 : 40-42

Colletes imbricatus Ferrari , new species

( Figs. 23 , 24 )

Diagnosis: The combination of mesepisternum with imbricate insterspaces, and T2–T5 entirely covered with paleyellow hairs is sufficient to distinguish C. imbricatus n. sp. from all other species of th genus found in Brazil. Colletes imbricatus n. sp. is most similar to C. hawkingi n. sp. as in both the mesosoma is covered with pale pubescence and the posterior hind tibial spur is pectinate. However, the females of the two species (the male of C. imbricatus n. sp. is unknown) can be differentiated from each other by malar area subequal in length to depth of mandible in C. imbricatus n. sp. (malar area ~0.2x as long as basal depth of mandible in C. hawkingi n. sp.), and clypeus sparsely punctate with imbricate interspaces in C. imbricatus n. sp. (clypeus densely punctate with striate insterspaces in C. hawkingi n. sp.).

Description: FEMALE ( Figs. 23 A–C):

Dimensions (mm): Approximate body length 9.9; head width 3.4; head length 2.7; intertegular distance 2.9; forewing length 7.8.

Colouration: Black except distal half of mandible, malar area below, clypeus laterally reddish-brown. Ventral surface of F2–F10, stigma, legs (except dorsal surface of distitarsi and hind tibia and basitarsus pale-brown), ventrally inflexed lateral area of T1–T3, marginal zones of T4–T5 dark-brown. Tegula, wing venation (except forewing veins R black and C dark-brown), tibial spurs, distal 2/3 of tarsal claws dark-orange. Marginal zones of T1–T3 palebrown. Proximal 1/3 of tarsal claws, marginal zones of metasomal sterna pale-yellow.

Structure: Labrum medially concave; concavity margined laterally by longitudinal ridges. Clypeal mid-longitudinal area shallowly depressed throughout; depression relatively narrow (0.6x MOD) above, broader (0.9x MOD) below. Malar area subequal in length to basal depth of mandible (41:43). Hypostomal carina short and flat. F1 ~1.2x as long as its apical width (30:24). UID:LID (67:63). Frontal area without protrusion below lateral ocellus. Vertexal area concave behind upper summit of eye in postero-lateral view. Dorsolateral angle of pronotum triangular acute. Mesepisternum ventrally, near ventral end of episternal groove, without protrusion surrounded by short hairs. Horizontal surface of metapostnotum ~0.4x as long as metanotum (20:48); metapostnotal pits well-delimited; posterior transverse carina straight and incomplete. Posteromedial surface of front coxa without spine. Posterior hind tibial spur pectinate. Hind basitarsus ~3.2x longer than broad (52:16). Outer rami of hind tarsal claws ~ 2x as long as inner rami (15:7). Marginal zone of T1 flat. Marginal zone of S6 depressed.

Pubescence: Head with pale-yellow, plumose, erect, moderately long hairs; except mandible and clypeal subapical pit with setae; paraocular area with pale-yellow and black hairs intermixed; genal area with appressed hairs above; vertexal area with black long hairs near occipital area. Mesosoma with pale-orange, plumose, erect, long hairs; except mesepisternum, metepisternum and upper margin of lateral surface of propodeum with pale-yellow, very long hairs; disc of lateral surface of propodeum with appressed, moderately short hairs. Legs with pale-yellow, erect, moderately long setae; except anteroventral surface of trochanters and ventral surface of femora with plumose, long hairs; femoral and tibial scopae with branched apically only, suberect, very long hairs anteriorly; front and mid tibiae with suberect, moderately short setae anterodorsally; basitarsi with long setae on posterior margin (hind basitarsus with very long setae). Mesosomal terga covered with pale-yellow, plumose, appressed, short hairs (except T6 with fuscous, suberect, moderately short setae); T1 also with erect, very long hairs; T2–T3 with erect, moderately short hairs laterally; T4 with erect, moderately long setae; those setae fuscous and long on T5. Metasomal sterna with pale-yellow hairs (except S6 with fuscous hairs near posterior margin); S1 with plumose, erect, moderately long hairs; S2 disc with branched apically only, erect, moderately short hairs; S3–S6 discs with suberect, short setae (except S5 posteriorly and S6 with moderately long setae); S2–S5 marginal zones with a transverse line of plumose, suberect, moderately short hairs.

Surface sculpture: Clypeal mid-longitudinal depression moderately densely and moderately finely punctate; adjacent convex area sparsely punctate; lower area longitudinally striate; interspaces imbricate throughout. Supraclypeal area imbricate. Malar area moderately densely and finely punctate above (interspaces imbricate); substrigulate below. Paraocular area densely and moderately finely punctate (except moderately densely punctate towards antennal socket and above); interspaces imbricate. Frontal area punctures difficult to discern from coarsely imbricate interspaces. Vertexal area densely punctate; moderately fine and minute punctures intermingled; interspaces smooth (except rugose near lateral ocellus). Mesosoma with imbricate interspaces throughout. Mesoscutum densely and moderately coarsely punctate (except punctures sparse and coarse posteromedially). Scutellum densely and moderately coarsely punctate anteriorly; punctures crowded and moderately fine posteriorly. Metanotum punctures crowded and moderately fine. Mesepisternum densely and coarsely punctate (except punctures sparser towards ventral surface). Metepisternum with oblique carinae mid-anteriorly; densely and moderately coarsely punctate above and below. Lateral surface of propodeum densely and finely punctate. Vertical surface of metapostnotum rugose above. Metasomal terga sparsely and minutely punctate throughout; interspaces smooth. Metasomal sterna with imbricate interspaces; S1 sparsely and finely punctate; S2–S4 moderately sparsely and moderately finely punctate (except densely and finely punctate laterally and near marginal zones); S5 densely and finely punctate; S6 densely and finely punctate anteriorly; sparsely and moderately finely punctate posteriorly MALE: Unknown.

Type material: Holotype ♀ —“CAÇAPAVA RS; Min. do Camaquṳ; Brasil 10.11 1990; C. Schlindwein leg.”. “PUC/RS—Univ. Tübingen; Lab. Pesq. Biológicas; 1957-313; F.40 17h”. “Colletes sp 2; ♀”. “CCDC-30383 C12”. “HOLOTYPE; Colletes imbricatus ♀; Ferrari, new species”. {UFMG}.

Paratypes: BRAZIL—Rio Grande do Sul: Caçapava do Sul, Minas de Camaquṳ, 25/x/2009, [C. Schlind- wein], 2♀♀, {UFMG}.

Range: BRAZIL (Rio Grande do Sul). See also Fig. 24 .

Biogeographical distribution: Chacoan dominion (Pampean province) at altitudes of 300–600m a.s.l.

DNA barcode: Unavailable.

Floral hosts: Loasaceae— Blumenbachia insignis Schrad.

Etymology: Reference to the fact that its mesosoma has imbricate interspaces, an uncommon feature amongst the Colletes species found in Brazil.

Comments: Seemingly a rare species that appears to be associated with the South American Pampas ecore- gion.

Figures

FIGURE 23. Colletes imbricatus n. sp. Female: (A) habitus, dorsal view (B); face, frontal view; (C) habitus, lateral view. Scale bars = 1mm.

FIGURE 24. Geographical range of Colletes imbricatus n. sp. (red star), and C. rugicollis (blue circles). Scale bar approxi- mately 250km