Hydraena dilutipes Fairmaire
- Dataset
- Hydraenidae of Madagascar (Insecta: Coleoptera)
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Insecta
- order
- Coleoptera
- family
- Hydraenidae
- genus
- Hydraena
- species
- Hydraena dilutipes
description
Description. Size: Lectotype (length / width, mm): body (length to elytral apices) 1.81 / 0.76; head width 0.43; pronotum 0.42 / 0.60, PA 0.44, PB 0.53; elytra 1.11 / 0.76. Dorsum dark brown, head darkest; legs brown; maxillary palpi brown to light brown, distal ½ of last palpomere darker. Mentum sparsely finely punctulate, shining; postmentum rugulose, dull. Genae raised, weakly rugulose, dull, without distinct posterior ridge. Head and pronotum coarsely densely punctate, punctures of pronotum slightly larger than those of head; interstices narrow ridges, shining. Pronotum slightly sinuate laterally; anterior margin straight behind eyes, emarginate behind frons; PF 1 very shallow; PF 2 shallow, very shallowly confluent medially forming weak U-shaped impression; PF 3 moderately deep; PF 4 absent. Elytra weakly arcuate laterally; summit of posterior declivity near distal 2 / 3; lateral explanate margins moderately narrow; serial punctures deeply impressed, round, and closely spaced, slightly larger than pronotal punctures. Intervals raised, narrow, shining, ca. 0.5 xpd. Apices in dorsal aspect conjointly rounded, in posterior aspect margins forming very shallow angle with one another. Ratios of P 2 width and plaque shape (P 2 / w / l / s) ca. 1 / 1 / 2 / 1.3. P 1 laminate; median carina sinuate in profile. P 2 l / w ca. 2 / 1, sides parallel, apex blunt, apex raised slightly above mesoventral intercoxal process. Plaques large, anteriorly and posteriorly rounded, parallel, anterior at level of surrounding cuticle, gradually elevating posteriorly such that posterior border is slightly raised above surrounding cuticle, located at sides of median depression. Metaventrite with very short longitudinal ridge on each side, extended posteriorly from margin of each mesocoxal cavity. AIS width at slightly arcuate posterior margin ca. 1.5 x P 2. Protibia moderately wide, slightly arcuate on medial margin, slightly more so on lateral margin. Mesotibia straight; medial margin with 7 – 8 very short spines (microslide mount), margin not notched between spines. Metatibia slightly arcuate, distal ½ of medial margin slightly emarginate and with large brush of setae. Abdominal apex slightly asymmetrical; last tergite with apicomedian notch. Females average slightly smaller than males; male metafemur longer and more sinuately shaped than in female; female metatibia simple and slightly shorter than in male.
diagnosis
Differential Diagnosis. Closely related to H. dilutipoides, differing therefrom by the larger size (ca. 1.81 mm vs. 1.73), the more coarsely densely punctate pronotum, and having the elytral intervals strongly raised and forming unbroken lines. The plaques of H. dilutipoides are more widely separated, especially posteriorly, and more sharply rounded at the posterior edge. Males of both species have large metatibial brushes. The aedeagi also show a relationship, having a large, flat distal extension of the main piece; the complex gonopore bearing distal piece differs significantly in the two species (Figs. 100 – 102).
discussion
Remarks. Fairmaire (1898) in the original description notes the differences in the shape of the abdomen of the male and female. It is therefore unquestionable that he had both sexes; however, he does not indicate how many specimens total he had. The locality given is " Dans l'Ikopa "; Ikopa is the river that flows through Antananarivo. Although the river is quite long, ca. 300 km, the type specimens were most likely collected in or very near the capital. Specimens were collected in the capital as late as 1990, by W. E. Steiner. However, these were not collected in the river, which is now quite polluted. Trizzino et al. (2012) presented the DNA sequence information of one male specimen (" MNCN AI- 547 DNA specimen ") with this locality data: Antsaba, Galoko Mountains, hygropetric cascade, elev. 303 m, 13 ° 39 ' S, 48 ° 45 ' E, 1 xi – 29 xii 2004, M. Balke (MD 016).
materials_examined
Type Material. Lectotype (male): Labels on lectotype: " Madag [illegible]; TYPE [red]; MUSEUM PARIS MADAGASCAR PERRIER DE LA BATHIE COLLECTION LEON FAIRMAIRE 1906; LECTOTYPE Hydraena dilutipes Fairmaire 1898, design. P. D. Perkins 2015 [red] ". Two female paralectotypes: 1) " Hydraena dilutipes Farm Madag; MUSEUM PARIS MADAGASCAR PERRIER DE LA BATHIE COLLECTION LEON FAIRMAIRE 1906; PARALECTOTYPE Hydraena dilutipes Fairmaire 1898, design. P. D. Perkins 2015 [red] ". 2) " Madag Perrier; MUSEUM PARIS MADAGASCAR PERRIER DE LA BATHIE COLLECTION LEON FAIRMAIRE 1906; PARALECTOTYPE Hydraena dilutipes Fairmaire 1898, design. P. D. Perkins 2015 [red] " (MNHN). Specimens examined (883): Antananarivo, 18.158 S 47.2104 E Analamanga, Manankazo river by the bridge of RN 4, medium size river over bedrock, elev. 1450 m, 18 ° 9 ' S, 47 ° 12 ' E, 21 xi 2014, J. Bergsten, R. Bukontaite, J. H. Randriamihaja, T. Ranarilalatiana & S. Holmgren (MAD 14 - 75) (4 NHRS); Manakambahiny, in seepage over exposed granite cliff face, 18 ° 55 ' S, 47 ° 32 ' E, 12 i 1990, W. E. Steiner (28 USNM); Antsiranana, 14.4345 S 49.7606 E Sava Marojejy NP Camp II, wide river forming hygropetric rocks, wide river forming hygropetric rocks and rockpools, elev. 710 m, 14 ° 26 ' S, 49 ° 45 ' E, 9 xi 2014, J. Bergsten, R. Bukontaite, J. H. Randriamihaja, T. Ranarilalatiana & S. Holmgren (MAD 14 - 54) (3 NHRS); 14.4369 S 49.7749 E Sava, Marojejy NP, 300 m N from Camp I, upstream, waterhole with dead leaves next to the stream, elev. 490 m, 14 ° 44 ' S, 49 ° 46 ' E, 8 xi 2014, P. D. Perkins (MAD 14 - 50) (10 MCZ); 14.4369 S 49.7749 E Sava Marojejy NP 300 m N from Camp I, upstream, waterhole with dead leaves next to the stream, elev. 490 m, 14 ° 26 ' S, 49 ° 46 ' E, 8 xi 2014, J. Bergsten, R. Bukontaite, J. H. Randriamihaja, T. Ranarilalatiana & S. Holmgren (MAD 14 - 50) (22 NHRS); 14.5221 S 49.7545 E Sava, bridge 80 km from Sambava, where tributary river enters Lokoho river, rockpools and sandy waterpools at river margin, elev. 120 m, 14 ° 31 ' S, 49 ° 45 ' E, 17 xi 2014, J. Bergsten, R. Bukontaite, J. H. Randriamihaja, T. Ranarilalatiana & S. Holmgren (MAD 14 - 73) (9 NHRS); Antsaba, Galoko Mountains, hygropetric cascade, elev. 303 m, 13 ° 39 ' S, 48 ° 45 ' E, 1 xi – 29 xii 2004, M. Balke (MD 016) (124 ZSMC; one male " MNCN AI- 547 DNA specimen "); Diana: Antsaba: Ambolamena mountain, 4 km SE Antsaba village, “ Antohatea be Cascade ”, S 13.67593 E 48.75589, GB nets, sieves, aspirator, forceps: waterfall with hygropetric rocks, elev. 381 m, 13 ° 41 ' S, 48 ° 45 ' E, 27 xi 2012, J. Bergsten, R. Bukontaite, J. H. Randriamihaja & T. Ranarilalatiana (MAD 12 - 29) (1 NHRS); Diana: Antsaba: Galoko mountains, S 13.60974 E 48.72175, sieves and aspirator: hygropetric rocks and water pools, elev. 263 m, 13 ° 37 ' S, 48 ° 43 ' E, 25 xi 2012, J. Bergsten, R. Bukontaite, J. H. Randriamihaja & T. Ranarilalatiana (MAD 12 - 26) (1 NHRS); Forêt d' Antsahabe, 11.4 km 275 ° W Daraina, malaise trap, tropical dry forest, elev. 550 m, 13 ° 12 ' S, 49 ° 33 ' E, 12 xii 2003, B. L. Fisher (BLF 10117) (1 CAS); Forêt d'Anabohazo, 21.6 km 247 ° WSW Maromandia, malaise trap- in tropical dry forest, elev. 120 m, 14 ° 18 ' S, 47 ° 54 ' E, 11 – 16 iii 2001, Fisher, Griswold et al. (BLF 3336) (1 CAS); Marojejy NP, camp 2, hygropetric habitat, 14 ° 26 ' S, 49 ° 46 ' E, 30 x 2007, J. Stastny (1 NHRS); Montagne d'Ambre, Grande Cascade, elev. 740 m, 13 ° 34 ' S, 49 ° 10 ' E, 1 xi – 30 xii 2004, M. Balke (MD 004) (20 ZSMC); Sambava: Marojejy NP, Camp 2 long waterfall along smooth rock area (hygropetric), N: - 14.43400, E: 49.75633, elev. 717 m, 14 ° 26 ' S, 49 ° 45 ' E, 7 xii 2006, Isambert et al. (P 57 Bi 12) (8 NHRS); Sava, Marojejy NP, 800 m N from Camp I, Humbert waterfall; 14.4333 S 49.773 E, waterfall, elev. 550 m, 14 ° 26 ' S, 49 ° 46 ' E, 8 – 12 xi 2014, J. Bergsten, R. Bukontaite, J. H. Randriamihaja, T. Ranarilalatiana & S. Holmgren (MAD 14 - 48) (12 NHRS); Marojejy NP, 800 m N from Camp I, Humbert waterfall; 14.4333 S 49.773 E, ex. bedrock pools at side of waterfall, elev. 550 m, 14 ° 26 ' S, 49 ° 46 ' E, 8 xi 2014, P. D. Perkins (MAD 14 - 48) (256 MCZ); Atsinanana, NP Midongy, 23 ° 30 ' S, 46 ° 55 ' E, 17 viii 2011, (collector not given on label) (4 NHRS); Fianarantsoa, 20.1711 S 47.091 E, Amoron'i, ManiaUpstream Talaviana river from the crossing with RN 7, 37 km S of Antsirabe, rocky river with sandy bottom and some hygropetric rocks, elev. 1360 m, 20 ° 10 ' S, 47 ° 5 ' E, 1 xi 2014, P. D. Perkins (MAD 14 - 01) (1 MCZ); 21.2581 S 47.4213 E, Vatovavy-Fitovinany, Ranomafana NP, Namorona river by bridge at park entrance, rockpools and hygropetric sites by river, elev. 890 m, 21 ° 15 ' S, 47 ° 25 ' E, P. D. Perkins (MAD 14 - 09) (37 MCZ); 7 km W Ranomafana, from seepage over sunlit rock at river, montane rainforest, elev. 900 m, 21 ° 16 ' S, 47 ° 25 ' E, 6 ix 1993, W. E. Steiner & M. Stebbins (32 USNM); same locality, W. E. Steiner & J. E. Cadle (41 USNM); 7 km W Ranomafana, on seepage over exposed rocks at bank of Namorona River, elev. 900 m, 21 ° 16 ' S, 47 ° 25 ' E, 1 – 7 iii 1990, W. E. Steiner (44 USNM); Ionilahy (Fianarantsoa), first left affl. of Riv. Ionilahy upstr. railroad bridge to Manakara, 200 m, 23.5 ° C, 0.088 mS / cm; hygropetric, elev. 200 m, 21 ° 43 ' S, 47 ° 38 ' E, 11 viii 2001, Gerecke & Goldschmidt (MD 20 c) (4 NMW); Ionilahy (Fianarantsoa) Mahavavona, spring 3 Exp. NW, (hygropetric on rocks exposed to sun in rice field), elev. 284 m, 21 ° 42 ' S, 47 ° 38 ' E, 20 iv 2011, R. Gerecke (MD 218) (1 NMW); Namorona River, 7 km W Ranomafana, from semi-shaded temporary pond in montane rain forest, elev. 1100 m, 21 ° 15 ' S, 47 ° 25 ' E, 1 – 7 xi 1988, W. E. Steiner (55 USNM); Namorona River, 7 km W Ranomafana, on seepage over exposed rock at bank of Namorona River, elev. 900 m, 21 ° 16 ' S, 47 ° 25 ' E, 8 – 21 x 1988, W. E. Steiner (38 USNM); Ranomafana, Namorona main river, rockpools, elev. 927 m, 21 ° 15 ' S, 47 ° 25 ' E, 1 xi – 30 xii 2004, M. Balke (MD 029) (93 ZSMC); Vatovavy Fitovinany: Ranomafana NP: Namorona river by the bridge below park entrance: S 21.25809 E 0 47.42165, GB Nets & sieves, rockpools, elev. 920 m, 21 ° 15 ' S, 47 ° 25 ' E, 1 xi 2011, J. Bergsten, R. Bukontaite, T. Ranarilalatiana, & J. H. Randriamihaja (MAD 11 - 09) (9 NHRS); Melaky: Tsingy de Bemaraha NP. S 18.75875 E 0 44.71648, elev. 112 m, 18 ° 46 ' S, 44 ° 43 ' E, 17 xii 2009, J. Bergsten, N. Jönsson, T. Ranarilalatiana, HJ. Randriamihaja (MAD 09 - 68) (1 NHRS); Toliara, Andhahela (Tulear), Isaka, stream exp. W 1 km N from the vill., elev. 250 m, 24 ° 48 ' S, 46 ° 51 ' E, 7 ix 2001, Gerecke & Goldschmidt (MD 63) (1 NMW); Ifaty, under seaweed drift on sand beach, 23 ° 9 ' S, 43 ° 37 ' E, 19 ix 1993, W. E. Steiner & R. Andriamasimanana (1 USNM); Tsimelahy (Tulear), Riv. Antarantsa, ca. 1 km upstream from village, elev. 300 m, 24 ° 56 ' S, 46 ° 38 ' E, 4 ix 2001, Gerecke & Goldschmidt (MD 58) (20 NMW).