Hydraena bispica, Perkins, 2017

Perkins, Philip D., 2017, Hydraenidae of Madagascar (Insecta: Coleoptera), Zootaxa 4342 (1), pp. 1-264 : 32-34

Hydraena bispica , new species

Figs. 23 (habitus), 27 (aedeagus), 230 (gonocoxite and spermatheca), 238 (map)

Type Material. Holotype (male): Toamasina, Alaotra Mangoro: Analamazoatra SR: close to park entrance: S 18.93573 E 0 48.41741, GB Nets and sieves, stagnant pools in tributary to Analamazoatra river , elev. 930 m, 8 xi 2011, J. Bergsten, R. Bukontaite, T. Ranarilalatiana, & J.H. Randriamihaja ( MAD11-26 ) ( NHRS) . Paratypes (176): Same data as holotype (8 NHRS) ; Antananarivo, Andasibe NP, btw Park and Hotel Feon'ny ala, close to bridge, big pond, N:-18.93750, E:48.41667, elev. 940 m, 18° 56' S, 48° 25' E, 6 i 2007, Isambert et al. (P61BI15) (1 NHRS) ; Andasibe, NP Perinet, Pfütze im Urwald , puddle in jungle, elev. 1250 m, 18° 49' S, 48° 27' E, 5 xii 2000, W. Dolin (MD 4/5) (12 NMW) ; Perinet , ex. forest litter, 18° 49' S, 48° 26' E, 12 x 1970, P. Hammond (4 BMNH) ; Tamatave, 18.9408S, 48.4178E, Alaotra-Mangoro: Analamazaotra SR: Bas fond, near trail to "lac rouge": Non permanent pond with much vegetation in primary humid forest, elev. 943 m, 18° 56' S, 48° 25' E, 16 iii 2015, T. Ranarilalatiana, J. Randriamihaja ( MAD15-01 ) (2 NHRS) ; Alaotra-Mangoro, Andasibe Mantadia, various habitats, mix of localities 3, 6, 7, 8, 9, 10, elev. 950 m, 18° 56' S, 48° 25' E, 16 iii 2015, T. Ranarilalatiana, J. Randriamihaja (4 NHRS); Moramanga (Tamatave), Ruiss. Amboasary upstr. Perinet , elev. 950 m, 18° 57' S, 48° 14' E, 16 vii 2001, Gerecke & Goldschmidt (MD 8) (1 NMW) ; Toamasina, 18.7911S 48.4259E Alaotra Mangoro Andasibe-Mantadia NP, Mantadia 12km N of park entrance, forest pond with some vegetation, elev. 960 m, 18° 47' S, 48° 25' E, 28 xi 2014, J. Bergsten, R. Bukontaite, J.H. Randriamihaja, T. Ranarilalatiana & S. Holmgren ( MAD14-83 ) (35 NHRS) ; 18.9355S 48.4166E Alaotra Mangoro Andasibe-Mantadia NP, Analamazoatra 150m E of park entrance, shallow partly dried out forest pond, elev. 930 m, 18° 56' S, 48° 25' E, 27 xi 2014, J. Bergsten, R. Bukontaite, J.H. Randriamihaja, T. Ranarilalatiana & S. Holmgren ( MAD14-14 ) (10 NHRS) ; 18.9385S 48.4219E Alaotra Mangoro Andasibe-Mantadia NP, Analamazoatra, pond 100m E from Lac Vert , shallow forest pool, elev. 940 m, 18° 56' S, 48° 25' E, 27 xi 2014, J. Bergsten, R. Bukontaite, J.H. Randriamihaja, T. Ranarilalatiana & S. Holmgren ( MAD14- 15 ) (2 NHRS) ; 18.9386S 48.4222E Alaotra Mangoro Andasibe-Mantadia NP, Analamazoatra, pond 150m E from Lac Vert , shallow forest pool, elev. 950 m, 18° 56' S, 48° 25' E, 27 xi 2014, J. Bergsten, R. Bukontaite, J.H. Randriamihaja, T. Ranarilalatiana & S. Holmgren ( MAD14-16 ) (14 NHRS) ; Alaotra Mangoro: Analamazoatra SR: close to park entrance: S 18.9355 E 0 48.41656, GB Nets and sieves, dried up forest pond, elev. 970 m, 18° 56' S, 48° 25' E, 8 xi 2011, J. Bergsten, R. Bukontaite, T. Ranarilalatiana, & J.H. Randriamihaja ( MAD11-25 ) (25 NHRS) ; Alaotra Mangoro: Analamazoatra SR: close to park entrance: S 18.93573 E 0 48.41741, GB Nets and sieves, stagnant pools in tributary to Analamazoatra river , elev. 930 m, 18° 56' S, 48° 25' E, 9 xi 2011, J. Bergsten, R. Bukontaite, T. Ranarilalatiana, & J.H. Randriamihaja ( MAD11-32 ) (26 NHRS) ; Alaotra Mangoro: Analamazoatra SR: pond 100m S Lac Vert : S 18.93812 E 48.42199, GB Nets & sieves, shallow forest pond, elev. 930 m, 18° 56' S, 48° 25' E, 9 xi 2011, J. Bergsten, R. Bukontaite, T. Ranarilalatiana, & J.H. Randriamihaja ( MAD11-30 ) (18 NHRS) ; Antsinanana: RN2, 6km N Toamasina by bridge: S 18.06493 E 0 49.37856, GB Nets and sieves, river and sidepool, elev. 0 m, 18° 4' S, 49° 23' E, 15 xii 2001, J. Bergsten, R. Bukontaite, T. Ranarilalatiana, & J.H. Randriamihaja ( MAD11-52 ) (1 NHRS) ; Toliara, Ifotaka (Tulear), Morafena, left affl. Riv. Mandrare upstr. vill., rest pools at cliffs Mt.Vohimary , elev. 250 m, 24° 48' S, 46° 8' E, 31 viii 2001, Gerecke & Goldschmidt (MD 52) (8 NMW) ; Ranopiso (Tulear), spring stream NW Centr d'Information ANGAP (left affl. MD 056), elev. 280 m, 25° 3' S, 46° 40' E, 2 ix 2001, Gerecke & Goldschmidt (MD 57) (3 NMW) ; Ranopiso (Tulear), stream NW Centr d'Information ANGAP (right affl. of the stream from Tsimelahy ), elev. 260 m, 25° 3' S, 46° 40' E, 2 ix 2001, Gerecke & Goldschmidt (MD 56) (1 NMW) ; Tsimelahy (Tulear), small stream exp. NW, affl. of Riv. Antarantsa , elev. 360 m, 24° 56' S, 46° 38' E, 4 ix 2001, Gerecke & Goldschmidt (MD 59) (1 NMW) .

Differential Diagnosis. Larger than the other two members of the group (ca. 1.97 vs. 1.70 mm), and with the lateral margins of the pronotum slightly more arcuate. The aedeagus differs in several respects from that of the other two species, including the main piece process having two short sharp points at the apex ( Fig. 27).

Description. Size: holotype (length/width, mm): body (length to elytral apices) 1.97/0.83; head width 0.46; pronotum 0.49/0.63, PA 0.51, PB 0.59; elytra 1.17/0.83.

Dorsum with head and pronotal disc dark brown to piceous; pronotum with margins light brown to brown; elytra brown; legs light brown to testaceous; maxillary palpi light brown to testaceous, distal 1/3 of last palpomere slightly darker, except tip testaceous.

Head with clypeus moderately finely and moderately densely punctate; frons coarsely densely punctate, interstices narrow walls to 0.5xpd. Pronotum coarsely densely and deeply punctate, interstices narrow walls or less than 1xpd, shining. Mentum moderately finely punctate, interstices shining; postmentum weakly rugose, dull. Genae raised, shining, posterior margin abrupt, posterior ridge very weakly raised, interrupted in midline.

Pronotum sinuate laterally; anterior margin straight behind eyes, emarginate behind frons; PF1 absent; PF2 very shallow; PF3 and PF4 deep, confluent.

Elytra weakly arcuate laterally; posterior declivity steep, summit slightly past midlength; lateral explanate margins narrow; serial punctures round, separated by ca. 0.5xpd or slightly less, slightly smaller than largest pronotal punctures. Intervals very weakly if at all raised, shining, ca. 0.5xpd. Apices in dorsal aspect conjointly truncate, in posterior aspect margins forming deep angle with one another.

Ratios of P2 width and plaque shape (P2/w/l/s [anteriorly]) ca. 1/0.2/2.5/1. P1 laminate; median carina weakly sinuate in profile. P2 l/w ca. 2/1, sides parallel, apex blunt. Plaques very narrow lines, not carinate, straight or very weakly arcuate, converging anteriorly, widely separated posteriorly, ca. 2x as wide as anteriorly, located at sides of deep median depression. Metaventrite cuticle rough, with overlapping undulating small ridges; anteromedian carina very small, short and low, almost absent; short longitudinal ridge on each side, extended posteriorly from margin of each mesocoxal cavity. AIS width at arcuate posterior margin ca. 2x P2. Protibia very weakly arcuate, distal 0.5 slightly thickened. Mesotibia and metatibia straight, slender. Metafemur rather slender, slightly arcuate on lateral margin, slightly sinuate on medial margin. Abdominal apex with deep apicomedian notch.

Etymology. Named in reference to the two short sharp points at the apex of the main piece process.