Metapocyrtus dagtum Cabras, Torrejos & Medina, 2021

Cabras, Analyn Anzano, Torrejos, Chrestine & Medina, Milton Norman, 2021, Metapocyrtus dagtum sp. nov., a new flightless weevil from Davao de Oro, Mindanao Island, Philippines (Coleoptera: Curculionidae: Entiminae: Pachyrhynchini), Biodiversity Data Journal 9, pp. 72561-72561 : 72561

Metapocyrtus dagtum Cabras, Torrejos & Medina sp. n.

Materials

Type status: Holotype. Occurrence: recordedBy: Local Collector; individualCount: 1; sex: male; lifeStage: adult; Taxon: scientificName: Metapocyrtus dagtum; kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Coleoptera; family: Curculionidae; genus: Metapocyrtus; specificEpithet: dagtum; Location: continent: Asia; islandGroup: Mindanao; country: Philippines; countryCode: PHL; stateProvince: Davao de Oro; municipality: Maragusan; locality: Mt. Candalaga ; locationRemarks: Type on red white card: Deposited in UMCRC; Identification: identifiedBy: AA Cabras; Event: samplingProtocol: handpicking; year: 2019; month: June Type status: Paratype. Occurrence: recordedBy: RJTV; individualCount: 8; sex: male; lifeStage: adult; Taxon: scientificName: Metapocyrtus dagtum; kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Coleoptera; family: Curculionidae; genus: Metapocyrtus; specificEpithet: dagtum; Location: continent: Asia; islandGroup: Mindanao; country: Philippines; countryCode: PHL; stateProvince: Davao de Oro; municipality: New Bataan; locality: Shadol ; locationRemarks: Type on red white card: Deposited in UMCRC; Identification: identifiedBy: AA Cabras; Event: samplingProtocol: handpicking; year: 2019; month: June Type status: Paratype. Occurrence: recordedBy: RJTV; individualCount: 5; sex: female; lifeStage: adult; Taxon: scientificName: Metapocyrtus dagtum; kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Coleoptera; family: Curculionidae; genus: Metapocyrtus; specificEpithet: dagtum; Location: continent: Asia; islandGroup: Mindanao; country: Philippines; countryCode: PHL; stateProvince: Davao de Oro; municipality: New Bataan; locality: Shadol ; locationRemarks: Type on red white card: Deposited in UMCRC; Identification: identifiedBy: AA Cabras; Event: samplingProtocol: handpicking; year: 2019; month: June Type status: Paratype. Occurrence: recordedBy: Local Collector; individualCount: 8; sex: male; lifeStage: adult; Taxon: scientificName: Metapocyrtus dagtum; kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Coleoptera; family: Curculionidae; genus: Metapocyrtus; specificEpithet: dagtum; Location: continent: Asia; islandGroup: Mindanao; country: Philippines; countryCode: PHL; stateProvince: Davao de Oro; municipality: Maragusan; locality: Langgawisan ; locationRemarks: Type on red white card: Deposited in UMCRC; Identification: identifiedBy: AA Cabras; Event: samplingProtocol: handpicking; year: 2019; month: October Type status: Paratype. Occurrence: recordedBy: Local Collector; individualCount: 5; sex: female; lifeStage: adult; Taxon: scientificName: Metapocyrtus dagtum; kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Coleoptera; family: Curculionidae; genus: Metapocyrtus; specificEpithet: dagtum; Location: continent: Asia; islandGroup: Mindanao; country: Philippines; countryCode: PHL; stateProvince: Davao de Oro; municipality: Maragusan; locality: Langgawisan ; locationRemarks: Type on red white card: Deposited in UMCRC; Identification: identifiedBy: AA Cabras; Event: samplingProtocol: handpicking; year: 2019; month: October Type status: Paratype. Occurrence: recordedBy: Local Collector; individualCount: 1; sex: male; lifeStage: adult; Taxon: scientificName: Metapocyrtus dagtum; kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Coleoptera; family: Curculionidae; genus: Metapocyrtus; specificEpithet: dagtum; Location: continent: Asia; islandGroup: Mindanao; country: Philippines; countryCode: PHL; stateProvince: Davao de Oro; municipality: Maragusan; locality: Mt. Candalaga ; locationRemarks: Type on red white card: Deposited in UMCRC; Identification: identifiedBy: AA Cabras; Event: samplingProtocol: handpicking; year: 2019; month: September Type status: Paratype. Occurrence: recordedBy: RJTV; individualCount: 2; sex: male; lifeStage: adult; Taxon: scientificName: Metapocyrtus dagtum; kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Coleoptera; family: Curculionidae; genus: Metapocyrtus; specificEpithet: dagtum; Location: continent: Asia; islandGroup: Mindanao; country: Philippines; countryCode: PHL; stateProvince: Davao de Oro; municipality: New Bataan-Maragusan Highway Boundary; locationRemarks: Type on red white card: Deposited in UMCRC; Identification: identifiedBy: AA Cabras; Event: samplingProtocol: handpicking; year: 2016; month: June Type status: Paratype. Occurrence: recordedBy: Local Collector; individualCount: 1; sex: male; lifeStage: adult; Taxon: scientificName: Metapocyrtus dagtum; kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Coleoptera; family: Curculionidae; genus: Metapocyrtus; specificEpithet: dagtum; Location: continent: Asia; islandGroup: Mindanao; country: Philippines; countryCode: PHL; stateProvince: Davao de Oro; municipality: Maragusan; locality: Mahayahay ; locationRemarks: Type on red white card: Deposited in UMCRC; Identification: identifiedBy: AA Cabras; Event: samplingProtocol: handpicking; year: 2018; month: June Type status: Paratype. Occurrence: recordedBy: Local Collector; individualCount: 1; sex: female; lifeStage: adult; Taxon: scientificName: Metapocyrtus dagtum; kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Coleoptera; family: Curculionidae; genus: Metapocyrtus; specificEpithet: dagtum; Location: continent: Asia; islandGroup: Mindanao; country: Philippines; countryCode: PHL; stateProvince: Davao de Oro; municipality: New Bataan-Maragusan Highway Boundary; locationRemarks: Type on red white card: Deposited in UMCRC; Identification: identifiedBy: AA Cabras; Event: samplingProtocol: handpicking; year: 2018; month: June

Description

Male

Dimensions (in mm): N=20. LB: 9.3-11.6 (holotype 9.3), LR: 1.9-2.7 (1.9), WR: 1.2-1.8 (1.2), LP: 3.0-3.9 (3.0), WP: 3.2-4.5 (3.2), LE: 7.2-7.7 (7.2), WE: 4.3-5.1 (4.3).

Habitus as shown in Fig. 1 A-C.

Integument black. Body surface, rostrum, head and underside with weak lustre. Body subglabrous. Head subglabrous with pale-blue, lanceolate scales and adpressed white piliform scales on forehead and coloured setae on sides; forehead weakly depressed, rugose especially towards eyes, and with faint longitudinal groove not reaching vertex.

Rostrum moderately rugose, longer than wide (LR/WR: 1.58), bearing sparse and adpressed piliform scales on dorsum and long white piliform scales on lateral surface below antennal scrobe; anterolateral sides also covered with long white piliform scales; transverse basal groove distinct; longitudinal groove barely present, but replaced with weak depression; apical third of dorsum finely punctured; dorsal surface nearly flat. Eyes medium-sized and feebly convex. Antennal scape slightly longer than the funicle (scape/funicle: 2.0/1.6). Scape moderately covered with fine, white adpressed hairs and funicle with yellowish suberect hairs. Funicular antennomeres I and II nearly the same length, twice as long as wide; funicular antennomeres III-VII nearly as long as wide; club subellipsoidal, nearly three times longer than wide.

Prothorax subglobular, wider than long (LP/WP: 0.94), subglabrous, weakly punctured, weakly rugose near anterior and posterior margins, widest at mid-length, weakly convex, highest point at mid-length, lateral margins convexly rounded and posterior margin truncate. Pronotum covered with pale blue, pale yellow and bluish-green lanceolate scales and adpressed, coloured piliform scales, except along midline which is nearly bare; anterior margin with yellow-ochre and pale blue narrowly ovate scales, and lateral sides above coxae covered with yellow-ochre narrowly ovate scales.

Elytra narrowly subovate, moderately tapered towards apex (LE/WE: 1.67), slightly wider and nearly twice longer than prothorax (WE/WP: 1.34, LE/LP: 2.40), subglabrous and weakly convex; surface black, irregularly covered with pale blue, turquoise and dull yellow, round to ovate scales and coloured adpressed piliform scales; apex with very sparse, coloured, fine setae.

Legs with moderately clavate femora. Femora fairly covered with white adpressed piliform scales. Tibiae fairly covered with adpressed, white piliform scales; piliform scales longer along inner margin; weakly serrate along inner edge. Fore- and mid-tibiae bearing mucro at apex. Tarsomeres pubescent all throughout. Coxae pubescent all throughout with white piliform scales. Mesoventrite covered with white adpressed piliform scales. Metaventrite with concentration of long golden-yellow adpressed piliform scales on discs, and turquoise, light-blue and dull yellow, round scales at distal ends. Ventrite I depressed on disc, with concentration of long golden-yellow adpressed piliform scales. Ventrites II-V with concentration of golden yellow hair-like scales, but much shorter. Ventrite V flattened, apex with fine punctures and suberect white piliform scales.

Male genitalia as shown in Fig. 2 (A-C). Aedeagal body short and stout, apex rounded, and apodemes nearly four times longer than aedeagal body.

Female

Dimensions (in mm): N:11. LB: 9.6-11.1 ( â: 10.3), LR: 2.2-2.3 (2.2), WR: 1.2-1.5 (1.3 mm), LP: 2.4-3.5 (2.8 mm), WP: 3.3-4.4 (3.7 mm), LE: 7.2-8.5 (7.6 mm), WE: 5.0-5.7 (5.2 mm).

Habitus as shown in Fig. 1 D-F.

Females differ from males in the following: a) rostrum slightly shorter in females; b) pronotum slightly shorter than in male (LP/WP: 0.67-0.79: female, 0.94: male); c) pronotum subquadrate with widest point right after anterior margin and truncate towards posterior margin; d) pronotum rugose at middle of disc; e) absence of lanceolate and ovate scales (which are part of the variation of elytral scales of this species); f) elytra subovate (LE/WE: 1.44-1.49), wider than in male (WE/WP: 1.29-1.51, LE/LP 2.42-3.0), widest before mid-legth and less constricted towards apex, and g) elytra with minute pubescence. Other than those features, females are similar to males.

Variation

Metapocyrtus dagtum sp. nov. displays a striking variation in its elytral pattern, as well as the shape of its scale markings (Fig. 3 ). While the holotype is observed to have pale blue, turquoise and dull yellow round to ovate scales on the elytra, prominently concentrated on its basal and outer margins, other specimens have sparser scales, while others are almost bare and other specimens with scales concentrated on the elytral striae. The scales also vary from round to ovate to piliform. Around 10% of the specimens also appear to have three transverse scale bands on the elytra consisting of a wide basal transverse band which extends at least 0.5 mm from the elytral suture to the lateral margins, a narrow transverse band on the middle and a subtriangular band along the elytral apex, all confluent towarss the lateral margin.

Diagnosis

Metapocyrtus dagtum sp. nov. is readily distinguished from its congeners by the unique shape of the pronotum and body, as well as scaly markings. The new species resembles Metapocyrtus (Metapocyrtus) lindabonus Schultze, 1922 by the aedeagus and both having a glossy black body with slender and subovate elytra, and a subglobular pronotum which is truncated at the base. Metapocyrtus dagtum sp. nov. can be easily distinguished from M. (M.) lindabonus by its longer and slender rostrum, absence of two scaly spots on both sides of the disc, strongly truncate pronotum, tapered elytral apex, and the uniform presence of piliform or round scales on the elytra.

Etymology

The specific epithet is from the Cebuano word " Metapocyrtus dagtum " which means pitch black, referring to the colour of the integument of the species.

Distribution

The new species is known only from the type locality in Davao de Oro, Mindanao, Philippines at present. The type localities of Metapocyrtus dagtum sp. nov. are in Maragusan and New Bataan which are located in the south-eastern portion of Davao de Oro (Fig. 4 ).

Biology

The new species was collected in the partially-shaded creek whose nearby ecotypes include agricultural and mixed secondary forests. The shallow creek’s vegetation includes various shrubs and ferns, such as Cyathea sp. ( Cyatheaceae ), Angiopteris evecta ( Marattiaceae ), and Diplazium esculentum ( Woodsiaceae ), amongst others. The new species was, however, collected on the plant Erechtites valerianifolius ( Asteraceae ), along the banks of the stream (Fig. 5 ).

Figures

Figure 1. Metapocyrtus dagtum sp. nov. A-C Male, holotype: A dorsal view, B lateral view, C ventral view D-F Female, paratype, A dorsal view, E lateral view, F ventral view.

Figure 2. Male genitalia of Metapocyrtus dagtum sp. nov. A aedeagus in dorsal view B aedeagus in lateral view C sternite IX in dorsal view.

Figure 3. Variability of elytral markings of Metapocyrtus dagtum sp. nov.: A-C, male habitus, D, female habitus.

Figure 4. Distribution map of Metapocyrtus dagtum sp. nov.

Figure 5. Habitat and habitus of Metapocyrtus dagtum sp. nov. A Habitat in Langgawisan, Maragusan, Davao de Oro, Mindanao B Erechtites valerianifolius (Link ex Spreng.) DC., a possible food plant of Metapocyrtus dagtum sp. nov. C-D Metapocyrtus dagtum sp. nov. in the field.