This paper deals with the description of a new species of Hemiptera, Gerromorpha, Mesoveliidae, from Marudá, State of Pará, Brazil - Darwinivelia polhemi n. sp. Illustrations of habitus, genitalia and other morphological parts are also included

Carvalho, J.

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On a new species of intertidal Water Strider from Brazil(Hemiptera, Gerromorpha, Mesoveliidae)byJosé C. M. Carvalho*National Museum, Rio de JaneiroAbstractThis paper deals with the description of a new species of Hemiptera, Gerromorpha, Mesoveliidae,from Ma¡udá, State of Pará, Brazil - Darwinivelía polhemi n. sp. Illustrations of habitus, genitalia andother morphological parts are also included.Keywords: Darvínívelia, water strider, Hemiptera, new species, Brazil.. The author received for study from Professor R. ARLÉ, a few specimens of a water bug collectedin Marudá, State of Pa¡á, Brazil. The bugs were found on the beach of an old mangrove swamp withremaining trunks covered by barnacles and vegetation of Spartîna brasiliensís. Specimens of the spring-tatl Holochor¿tes schusteri ARLÉ were also present in the same habitat.Pursuing research ín this material the autho¡ has found it to be a new species of DøwiniveliaANDERSEN & POLHEMUS, 1980, which is described in this paper.The illustrations in the text were made by Maria Helena BARRETO unde¡ the author's super-vision.Darwinivelia polhemí n. sp.(Figs. I - 13)Gerromorpha, Mesovelüdae. Body elongate oval, flattened, apterous, covered by very short anddraracteristic silvery velvety pubescence (under incident light) and transverse bands of longer, flattenedhairs on the hind margins of abdominal segments (from IV to IX), becoming longer as they extendtowa¡<ls the distal end of the body, ground surface shagreen.* Research Fellow National Council for Development of S cience and Technology (CllPq)0065-6755 I 1984 | 519 / @ MPI fÌir Limnologie, AG Tropenökologie, Plön;INPA, I\laaaus519Head sho¡t, head length 3/4 the width aüoss eyes and subequal to middo¡sal length of prothorax.Ocelli absent. Three pairs of cephalic trichobothria, the two ante¡ior pairs, inserted close together infront of eyes. Dorsalhead surface smooth, convex, without punctures. Eyes small,,globular, with about28 - 30 ommatidea each, without ocular setae between them. Contiguous to anterior margin of prothorax.Head declivant in front of eyes, frontal area na¡rowed towards clypeus, posterior margin slightly conqtve,epypharynx small, pointed distally, gena f1at, gula short, bucullae with carena. Antennal tubercles pro-minent, wide; antennae slender, segment I incrassate, slightly curved outwards, shorter than body, finelypilose, segments III and IV with a few e¡ect setae, longer than thickness of segments, segment IV withoutunpigmented median zone. Ventral region of head ending in a straight angle before prosternal margin.Rostrum fairly long, reaching the metacoxae, segment II longest and larger, basal two segments short,fused.Thorax relatively short, dorsal length subequal to length of basal two abdominal tetgites together.All three thoraxic segments vísible above as transverse plates with slightly sinuate intersegmental sutures;pronotum longer than meso- and metanotum together, meso- and metanotum equal in length. Pro- andmesopleuron subequal in size, each slþhtly larger than mesopleuron.Legs slender, moderatly long, hind leg longest, femora and tibiae with very fine sericeous hairs,the femora with a subapical seta, tarsi with th¡ee segmentsgradatively increasing in length; claws with abasal spur, dorsal and ventral arolia present, parempodia setiform, symmetrical.Abdomen dorse-ventrally flattened, rather broad, greated width slightly less than total length,mediotergites tapering in width towards abdominal apex. Paratergites relatively broad, slightly raised.Male: Length 1.5 mm, width 0.8 mm. Head: Length 0.4 mm, width 0.8 mm, vertex 0.24 mm.Antennae: Segment I, length 0.29 mm;11,0.22 mm;III, 0.34 mm; IV,0.42 mm. prothorax: pronotumlength 0.12 mm, mesonotum 0.6 mm, metanotum 0.5 mm. Conexivum width 0.12 mm.Iængth of legs: Femur Tibia Tarsus I II IIIanterior 0.44 0.41 0.4 0.4 0.4middle 0.50 0.54 0.4 0.6 0.8posterior 0.50 0.80 0.10 0.14 0.14Rostrum: length of segments: II, 0.36 mm; IV, 0.14 mm.General coloration brown; antennae and legs brown; apices of femora, base of tibiae, segment IIof antenna distally, segments III and IV slightly darker.Other morphological characters as indicated for genus.Genit¿lia: Included in the VIII abdominal segment GAs. 6 - 7) with two homologous parameres;Pygophore (Fig. 8) open distally. Vesica (Fig. 9) with seminal duct followed by a sclerotized tube endingin the seconda¡y gonopore, with cha¡acteristic sclerotized appendages, as seen in illustration.Female: with same general colo¡ation and aspect, slightly more robust, length 1.9 mm, width1.0 mm. Head: Lenght 0.3 mm, width 0.4 mm, vertex 0.24 mm. Antennae: Segment I, length 0.24 mm;n"0.22 mm; III,0.30 mm; IV, 0.40 mm. P¡othorax: Pronotum length 0.14 mm, mesonotum 0.6 mm,metanotum 0.4 mm. Connexivum width 0.12 mm. Legs measurements as in male.The following differences ftom Darwinivelío fosterí ANDERSEN & POLFIEMUS, 1980 can bedetected:pothemí fosterícompound eye with 28 - 30 compound eye with 10 - 12 ommatidiaommatidia each. each.Posterior margin of pronotum Posterior margin of pronotumand mesonotum evenly rounded. and mesonotum sinuate-Antennal measurements segmentsI : II : lll : IV;12 :7 : 12 : 74(mâle, female III, IV missing).Length of thoracic dorsum micl-lineslightly longer than first two abdominaltergites (9 : 85)Antennal measurements segmentsI :II : III :lY;12:8 : 14: l8(female ; male unknown).Léngth of thoraoic dorsum mid-lineslightly shorter than fhst two abdominaltergites (9 : 9.5).520Holotype: Male, Marudá, state of Parâ,Braz]i.,R. ARLE, 7 - 8 December,19'1'1,in the collectionof the National Museum, Rio de Janeiro. Paratypes: 5 males, 4 females and 5 nymphs, in the collectionsof the National Museum, Rio de Janeiro, United States National Museum of Natu¡al History, WashingtonD. C., John T. POLHEMUS and of the author.The specific name is given in homage to my colleague John T. POLHEMUS, in recognition for hisextensive and valuable work on the aquatic Hemiptera.ResumoEste trabalho t¡ata da descrição de uma nova espécie de Hemiptera, Gerromorpha, Mesoveliidae'de Marudá, Estado do Pará, Brasil - Darwinivelia polhemi, n. sp.Ilustrações da forma, genitalia e outras partes morfológicas são também incluidas.RçferencesANDERSEN, N. M. & J. T. POLHEMUS (1980): Four new genera of Mesoveliidae (Hemiptera,Gerromorpha) and phylogeny and classification of the family.- Ent. S cand. I l: 369 - 392.POLHEMUS, J. T. (1975): New estuarine and intertidal water striders from Mexico and Costa Rica(Hemiptera, Gerridae), Mesoveliidae).- The Pan Pac. Ent. 5l 243 - 24'l 'POLHEMUS, J. T. (1976): In: CHEBG, L., Marine Insects. American Elsevier Pub. comp., New York,p.187 - 224.Author's address:Dr. José Cândido de Melo CarvalhoNational MuseumQuinta da Bôa VistaRio de Janeiro, RJBnzú,Accepted for publication in July 198452r6 71ooÈ34lelå10lt€€'a)11 Io'I2 5I ìtt50¡ m312130,5 rn mFigs. 1 - 5:Darwinivelia polhemi n. sp.l: Female, paratype;2: Head and rost¡um seen from side; 3: Head and prothorax of female, ventral view;4: Hind tarsus;5: Hind claws.Figs. 6 - 13:Dorwínívelía polhemí n. sp.6: Pygophore, ventral view; 7: Idem, lateral view; 8: Proctþer;9: Vesica of aedeagus;l0 - l3: Different view of parameres.1lìr]/,¡,1111\.)ìI'ììIIIIIIi'lI Ii522 523

On a new species of intertidal water strider from Brazil (Hemiptera, Gerromorpha, Mesoveliidae)

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