Desmopachria apicodente, Miller, 2022

Miller, Kelly B., 2022, Nineteen new species of Desmopachria Babington, 1841 (Coleoptera, Adephaga, Dytiscidae, Hydroporinae, Hyphydrini) with notes on the taxonomy of the genus, ZooKeys 1136, pp. 1-56 : 1

Desmopachria apicodente sp. nov.

Figures 13-17 , 77

Type locality.

Venezuela, Apure State, between Orinoco and Cinaruco Rivers, 6°30.900'N, 67°32.604'W.

Diagnosis.

Specimens are moderately large for a Desmopachria species (TL = 1.7-1.8 mm). The dorsal color pattern is distinctive with a large dark brown region on the elytron medially near the suture and with a large, diffuse pale macula apicomedially and along the lateral margins to the apex (Fig. 13 ). The male genitalia are distinctive with the male median lobe straight and apically sharply pointed in lateral aspect (Fig. 14 ) and broad and apically broadly truncate in ventral aspect (Figs 15 , 16 ). The lateral lobe is moderately broad with the apices sharply curved mediad with a distinct, small, elongate apical tooth (Figs 16 , 17 ). Desmopachria amyae Miller, from Bolivia, has very similar genitalia including the apical tooth on the lateral lobe ( Miller 2001: fig. 2), but that species has a different color pattern, an elytral sutural stria, and lateral furrows on the elytron ( Miller 2001) which are missing in Desmopachria apicodente . Desmopachria lateralis , also from Venezuela, also has a minute apical tooth on the lateral lobe, but a different dorsal color pattern, a distinct carina along the lateral margin of the elytron, and the male median lobe is differently shaped, with a distinctive subapical expansion on the ventral margin medially (Fig. 20 ).

Description.

Measurements. TL = 1.7-1.8 mm, GW = 1.2-1.3 mm, PW = 1.0-1.1 mm, HW = 0.7-0.8 mm, EW = 0.4-0.5 mm, TL/GW = 1.3-1.4, HW/EW = 1.8-1.9. Body broad, laterally broadly rounded, lateral margins continuous between pronotum and elytron; dorsoventrally rounded.

Coloration. Head pale orange. Pronotum pale orange with dark area along posterior margin. Elytron dark red-brown broadly along suture, becoming pale red medially, with pale, poorly demarked maculae anteromedially, laterally along border, apically, and often in small line medially (Fig. 13 ). Ventral surfaces yellow to orange.

Sculpture and structure. Head broad, short; anterior margin of clypeus finely margined with continuous narrow bead; surface of head shiny, punctation extremely fine and sparse; eyes large (HW/EW = 1.8-1.9); antennae short, scape and pedicel relatively large and rounded, flagellomere III long and slender, apically expanded, antennomeres IV-X short and broad, antennomere XI elongate, apically pointed. Pronotum short, lateral margins short, curved with continuous narrow bead; surface shiny, punctation very fine, of the same size and evenly distributed, posterior margin slightly sinuate. Elytron broad, laterally broadly curved; surface shiny, punctation small, some punctures arranged into indistinct series, especially anteromedially. Prosternum extremely short, longitudinally compressed, medially flattened; prosternal process short, broad, flattened, apically pointed. Metaventrite broad and evenly smoothly convex medially, surface shiny, impunctate; metaventrite wings extremely slender. Metacoxa with medial portion short, <1/3 length of metaventrite medially, metacoxal lines slightly sinuate, divergent anteriorly; lateral portion of metacoxa extremely large, anteriorly strongly expanded; surface shiny, impunctate. Metatrochanter very large, longer than length of ventral margin of metafemur; legs otherwise not noticeably modified. Abdomen with surfaces shiny and smooth, surface impunctate.

Male genitalia. Male median lobe in lateral aspect moderately broad, elongate, straight, and of even width to sharply pointed apex, apically slight curved ventrad (Fig. 14 ; in ventral aspect elongate and broad, subapically slightly constricted, apex broadly subtruncate (Fig. 15 ). Lateral lobe elongate, moderately broad throughout most of length, apex strongly curved mediad with small but distinctive elongate “tooth” at apex (Figs 16 , 17 ).

Sexual dimorphism. No obvious external sexual dimorphism was observed.

Variation. Specimens vary considerably in the extent of the fasciate pattern on the elytron and intensity of coloration, some of which is related to teneral condition. Some specimens barely have pale regions visible that are weakly delimited, others have a distinctive pattern on the dorsal surface.

Etymology.

This species is named Desmopachria apicodente , from Latin, apico, for apical, and dente, for tooth, for the apical tooth on the male lateral lobe.

Distribution.

This species is known only from Apure, Bolivar and Amazonas States, Venezuela and Region IX, Guyana (Fig. 77 ).

Type material.

Holotype in MIZA, male labeled, "VENEZUELA: Apure State 6°30.900'N, 67°32.604'W; 68m Btw Orinoco and Cinaruco Rivers 17.i.2009; Short, Miller, Camacho VZ09-0117-01X; morichal/ SMEC085232 KUNHM-ENT [barcode label]/ HOLOTYPE Desmopachria apicodente Miller, 2021 [red label with black line border]." Paratypes, 400, all with different barcode labels (Table 1 ) and “… /PARATYPE Desmopachria apicodente Miller, 2021 [blue label with black line border]"; 20 in MIZA, MSBA and SEMC labeled same as holotype; 31 in SEMC labeled, "VENEZUELA: Bolívar State 6°13'4.6"N, 67°14'26.4"W, 60m ca. 25 km E El Burro 12.i.2009; leg. Short et al. rocky morichal; VZ09-0113-01X/ …”; 10 in SEMC labeled, "VENEZUELA: Amazonas State 5°20.514'N; 67°45.315'W, 87m S. Communidad Porvenir 15.i.2009; leg. Miller & Short VZ09-0115-03B: small streamlet/ …”; 50 in CSBD and SEMC labeled, "GUYANA: Region IX 2°48.531'N, 59°51.900'W, 170m Kusad Mts., Mokoro Creek pool in rock, with detritus leg. A. Short; 27.x.2013 GY13-1027-03E/ …”; 29 in SEMC labeled, "GUYANA: Region IX 2°47.417'N, 59°53.986'W, 113m Kusad Mts., Taraara Wao Creek margin & isolated side pools leg. Short, Isaacs, Salisbury 28.x.2013; GY13-1028-01A/ …”; 9 in SEMC labeled, "GUYANA: Region IX 2°48.588'N, 59°51.931'W, 194m Kusad Mts., basecamp area leg. A. Short; 23.x.2013; pool in creek bed; GY13-1023-02A/ …”; 7 in SEMC labeled, "GUYANA: Region IX 2°48.531'N, 59°51.900'W, 170m Kusad Mts., Mokoro Creek pool in rock, with detritus leg. A. Short; 27.x.2013 GY13-1027-03E/ …”; 12 in SEMC labeled same, except, “… main seepage area leg. Short, Isaacs, Salisbury 27.x.2013; GY13-1027-03B/ …”; 1 in SEMC labeled, "GUYANA: Region IX 2°48.531'N, 59°51.900'W, 170m Kusad Mts., large seepage nr. Basecamp; on wet rocks leg. A. Short & W. Washington GY13-1024-03C/ …”

Figures

Figures 13 - 27. Desmopachria apicodente - group species. (13 - 17) Desmopachria apicodente 13 habitus 14 male median lobe, right lateral aspect 15 male median lobe, ventral aspect 16 male median lobe and lateral lobes, ventral aspect 17 right lateral lobe, right lateral aspect (18 - 22) Desmopachria lateralis 18 habitus 19 left elytron, left lateral aspect 20 male median lobe, right lateral aspect 21 male median lobe and right lateral lobe, ventral aspect 22 right lateral lobe, right lateral aspect (23 - 27) Desmopachria tumida 23 habitus 24 left elytron, left lateral aspect 25 male median lobe, right lateral aspect 26 male median lobe, ventral aspect 27 right lateral lobe, right lateral aspect. Scale bars: 1.0 mm for habitus drawings.

Figures 76, 77. Desmopachria species distributions. 76 ungrouped Desmopachria species 77 Desmopachria apicodente species group.