The ♀ and last larval instar are described and illustrated based on specimens from Argentina (Buenos Aires province). The ♀ is unique in the possession of a subapical tooth on each lobe of the vulvar scale, and it can be besides distinguished from P. andromeda, the only other Phyllogomphoides sp. found in Argentina, by the pterothoracic colour pattern. The larva differs from all known South American Phyllogomphoides larvae by the crenate inner margin of the labial palp.Instituto de Limnología "Dr. Raúl A. Ringuelet

Muzón, Javier

Pessacq, Pablo

Von Ellenrieder, Natalia

English

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Odonatologica35(1): 55-60 March 1, 2006Description of the femaleand larvaofPhyllogomphoidesjoaquini RodriguesCapitulo, 1992(Anisoptera: Gomphidae)J. Muzón¹,P . Pessacq¹and N. von Ellenrieder²Received March 9, 2005 / Reviewed and Accepted April3, 2005INTRODUCTIONPhyllogomphoides joaquini was describedby RODRIGUES CAPITULO(1992)based on four males from Buenos Aires province. Only two Phyllogomphoidesspecies have been so far recorded from Argentina, P. andromeda, from the north-eastern limit of the country, and P. joaquini from Buenos Aires province. Here,a description of its female (based on a pair collected in tandem and comparedwith the type specimens deposited at the Museo Argentine de Ciencias Natu-rales Bernardino Rivadavia collection [MACN]), and larva are provided for thefirst time.DESCRIPTION OF THE FEMALEFigures 1-4Material. — Argentina, Buenos Aires province, without data, J. Bosqui leg, I 9 (MACN);same except Canuelas, arroyo Canuelas at ruta provincial 6, 35°05’36.1” S, 58°41’25.6” W, 16-XII-1 Institute de Limnologia “Dr. R.A. Ringuelet”,C.C. 712, AR-1900 La Plata, Argentinamuzon@ilpla.edu.ar2Museo de Ciencias Naturales, Universidad Nacional de Salta, Mendoza 2, AR-4400 Salta,Argentinaodo_nata@hotmail.comThe 9 and last larval instar are described and illustrated based on specimens fromArgentina(BuenosAires province). The 9 is unique in the possession of a subapicaltoothon each lobe of the vulvar scale, and itcan be besides distinguishedfrom P. an-dromeda,theonly other Phyllogomphoidessp. found in Argentina,by the pterothoraciccolour pattern. The larva differs from all known South American Phyllogomphoideslarvae by the crenate inner margin of the labial palp.J. Muzon, P. Pessacq & N. von Ellenrieder56-1999, Muzon leg,, 6 and $ in copula (Museo de La Plata collection [MLP]); same except Pergami-no, arroyo Maguireat ruta nacional 8, 33°57’46” S, 60°16’22”W, 15-1-2002, Muzon & Pessacq leg.,1 3 (MLP); same except Capitan Sarmiento,arroyo Horquetaat ruta nacional 8, 8-1-2002, 1 3 and1 9 (MLP).Head. — As male except rear of occiput and external half of postgenae yel-lowish green and labium whitish.Thorax. — Prothorax anterior lobe dark brown, middle lobe brown witha posteromedial yellowish green spot, posterior lobe black. Pterothorax as maleexcept antealar sinus yellowish (Canuelas).Legs. - As male except dark stripe in femora I and 11 developed as in femurIII; tarsus III and basitarsus I and II yellowish.Wings. — Forewings, antenodal crossveins 16-17, thickened antenodals 1 st and6 th or 8th,postnodals 9-12. Hindwings, antenodalcrossveins 11-12, thickened an-tenodals I s ' and 5th,6 lh or 7th,postnodals 9-12. Triangle 3-celled, supratriangle 1or 2-celled, subtriangle 2 or 3-celled.Abdomen. — As male except dark dorsal area on distal 1/3 of segments II-VIII; X yellowish green; lateral dilatations on IX yellowish and narrower thantwice the widthof thoseof segmentVIII; sterna I-II and IX-X yellowish, III-VIblack, VII-VIII brownish with black 1/7 basal; cerci (Figs. 1-2) yellowish withbrown tips; paraprocts yellowish. Vulvar scale lobes rounded with convex sidesand separated by a distance smaller than the width of each lobe and bearing asubapical tooth (Figs. 3-4)Measurements (inmm). — Total length61.77 ± 0.21, FW 40.78 ±1.3, HW 38.7 ± 1.6; ptero-stigma (costal edge) FW 5.2 ± 0.2, HW 5.5 ± 0.09, femur III 7.25 ± 0.21, abdomen length withoutcerci 45.4 ± 0.36, cerci 2.43 ± 0.06.Figs 1-4. female; (1) abdominal segments VIII-X, lateralview;-(2) cerci, dorsal view;-(3) vulvar plate, ventral view; - (4) vulvar plate, ven-trolateral view. — [Scales: Figs 1-2: 1 mm; Figs 3-4: 4 mm]Phyllogomphoidesjoaquini,Female and larva of PhyUogomphoidesjoaquini 57DESCRIPTION OF THE LAST LARVAL INSTARFigures 5-15Material. - Argentina, Buenos Aires province, Pergamino, arroyo Maguire at ruta nacional8, 9-1-2002, Pessacq & Muzon leg., 1 S last larval instar (MLP),male: (5) general aspect, dorsal view; - (6)antenna, lateral view; - (7) right molar crest, inner-dorsal view; - (8) left molar crest, inner-dorsalview; - (9) rightmandible,inner view; - (10) left mandible, inner view; - (11) left lacinia, ventral view;- (12) labial palp, ventral view; - (13) prementum, ventral view; - (14) lateral spines of abdominalsegments VII-IX, dorsal view;-(15) abdominal dorsal hooks, lateral view. — [Scales: Fig. 5; 5 mm;Figs 6-12: 0.5 mm; Fig. 13; 1 mm; Figs 14-15: 2 mm]Figs 5-14. Last larval instar of Phyllogomphoidesjoaquini,J. Muzon, P. Pessacq & N. von Ellenrieder58Head. - 1.14 times as wide as long, posterior margin slightly concave. Ocellipale. Labrum covered with scale-like setae except a central rectangular bare area;anterior margin with a fringe of thin long setae. Anteclypeus bare. Postclypeus,frons and vertex with scale-like setae; central triangular and lateral circular ar-eas on vertex bare. Cephalic lobes with an irregular pattern of scale like setae.Antenna 4-jointed, 3 basal antennomeres covered with thin long setae and scalelike setae, fourth bare; proportions of antennomeres 0.2, 0.18, 1,0.09. Maxillaewith thin long setae along external margin; laciniae with seven sharp and curvedtooth, four ventral and three dorsal, the latter longer. Galea pointed, with thinlong setae along the external margin. Prementum rectangular, 0.78 as wide aslong, sides slightly convergent basally, dorsal surface bare, except for few lateralthin long setae; ligula convex, with long scale-like setae (pointed withwide base)along margin and ventral surface with a row of long thin setae. Labialpalp short,inner margin crenate, with6-7 crenulations increasing size distally, external mar-gin with thin long setae. End hook of palp stout and strongly incurved. Mova-ble hook 0.8 times as long as palp. Articulationof pre- and postmentum almostreaching the base of coxa II. Mandibularformula as follows (sensu WATSON,1956); L 1234 0 a (m12345) b, R 1234 y a (m123) bThorax. — Pronotumquadrangular, covered with scale-like setae, except twobare subquadrangular central areas with sparse central setae. Synthorax coveredwith scale-like setae, wing pads parallel, almost reaching the end of fourth ab-dominalsegment, posterior margin with rows of thin long setae. Legs short andthick densely covered with thin long and scale like setae, except for longitudinalbare areas in femora and tibiae. Burrowing hooks on tibiae 1 and 2.Abdomen.— Elongated and tapering caudally, maximum width at segments5 and 6; mostly covered with scale like and sparse thin long setae, except for cir-cular areas on each side of segments; lateral margin heavily setose. Segment 10tubular, longer than 9. Dorsal hooks present on segments 2-9, increasing in sizedistally. Dorsal hooks on 7- 9 overlapping the next segment. Lateral spines onsegments 7-8 slightly incurved, almost straight on 9. Terminaliaacutely pointed,proportions to epiproct as follows: epiproct 1, paraprocts 0.7, cerci 0.8.Measurements (in mm). - Total length without appendages 34.0. Head: max. width 5.5,max. long 4.8. Antennomeres, 0.35, 0.3, 1.7, 0.15. Prementum long 3.6, max. width 2.8; labial palp,inner margin long 1.0, movable hook 0.9, ligula 0.9. Thorax: femur I 2.4, II 2.6, III 4.3; tibia I 3.5,II 3.3, III 4.5; inner wing pads 8.3, external wingpads 7.7. Abdomen: middorsal lengthsegments IVto X as follows, 1.5, 1.7, 1.8,1.8,1.9, 1.9, 3.1; dorsal hooks (length in dorsal view) segments II to IXas follows, 1.0, 1.1, 1.3, 1.3, 1.3, 2.0, 2.0, 2.3; lateral spines on segment VII 0.4, VIII 0.6, IX 0.6; cerci1.6, epiproct 1.9, paraprocts 1.4.DISCUSSIONThe tweezers-shaped cerci of the male (RODRIGUES CAPITULO, 1992)refer this species to the andromedagroupof BELLE (1984), which includes Phyl-Female and larva ofPhyUogomphoidesjoaquini 59logomphoides andromeda, P. cassiopeia and P. cepheus.The female is unique within the genus in the possession of a subapical toothon each lobe of the vulvar scale (Figs 3-4). It is easily differentiable fromthe fe-males of P. andromeda, P. Cassiopeia and P. cepheus by the shape of the vulvarscale lobes, which are rounded with convex sides and separated by a distancesmaller than the width of each lobe in P. joaquini (Figs 3-4), and triangular withstraight sides and separated by a distance larger than the width of each lobe inP. andromeda,P. cassiopeia and P. cepheus (BELLE, 1970, 1975, 1980, 1994). Itdiffers besides from P. andromeda by the thoracic colour pattern (without palemesothoracic halfcollar and with first pale antehumeralstripe pear shaped ob-long in P. andromeda - with pale half collarand pale stripe linear in P. joaquini),from P. cassiopeia by the colourpattern of labrum (with black margin in P. Cas-siopeia - pale in P. joaquini), and from P cepheus by the extension of the lateraldilatationsof segment 8 (dilatations narrower than 1/6 of middorsal length ofsegment 8 and twice as wide as thoseof segment 9 or wider in P. cepheus- widerthan 1/5 of middorsal length of segment 9 and narrower thantwice the widthofthose of segment 9 in P. joaquini, Fig. 1).It can be distinguished from all the South American larvae of Phyllogom-phoides known (COSTA et ah, 1999) by the crenate inner margin of the labialpalps (Figs 7-8).Based on larval characters NOVELO GUTIERREZ (1993) suggested thattwo evolutive lineages, South Americanand Middle American, could be recog-nized in the genus. The species belonging to the South American lineage wouldshare prementum widened laterally at the middle; small ligula, its width shorterthan the base of palp articulation; scale-like setae of ligula short; end hook ofpalp sharply pointed; internal margin of palp smooth or with a few blunt teeth;and lateral spines on abdominalsegments 7-9 incurved. The larva of P. joaquiniagreeswell with the first three character states proposed, but the scale-like setaeof ligula are long, the end hook of labial palp is not sharply pointed, its innermargin is crenate (Fig. 12), and the lateral spine of segment 9 (Fig. 14) is straight(character states assigned to the Middle American lineage). It is evident that therelationships within the genus are more complex than first thought, and shouldbe re-evaluated taking into considerationadult as well as larval characters.ACKNOWLEDGMENTSWe thank Dr ROSSER W. GARRISON for the critical reading of the manuscript. This study wassupportedby the Consejo Nacional de Investigaciones Cientificas y Tecnicas de Argentina (CONICET).REFERENCESBELLE, X, 1970. Studies on South American Gomphidae(Odonata). Stud. Fauna Suriname 11(43):1-158.J. Muzon, P. Pessacq & N. von Ellenrieder60BELLE, J., 1975. Two new gomphine species from Paraguay (Anisoptera:Gomphidae). Odonato-logica 4(3): 129-135.BELLE, J., 1980. Two new gomphoidinespecies from Brazil (Anisoptera: Gomphidae). Odonato-logica 9(2): 173-180.BELLE, J., 1984. A synopsis of the South American species of Phyllogomphoides, with a key anddescriptions of three new taxa (Odonata, Gomphidae). Tijdschr. Ent. 127(4): 79-100.BELLE, J., 1994. On five species of PhyllogomphoidesBelle, 1970, from Brazil with the descriptionsof three new taxa (Odonata: Gomphidae). Zool. Med. Leiden 68(8): 73-85.COSTA, J.M., T.C. SANTOS& A.M. TELLES, 1999. Phyllogomphoidesannectens (Selys): descrip-tion of the last larval instar, with a key tothe South American species (Anisoptera; Gomphi-dae). Odonatologica28(1): 79-82.NOVELO-GUTIERREZ, R., 1993. Four new larvae ofPhyllogomphoides Belle from Mexico (Ani-soptera: Gomphidae). Odonatologica22(1): 17-26.RODRIGUES CAPITULO, A,, 1992. Phyllogomphoides joaquini spec, nov,, a new Gomphoidinifrom Argentina (Anisoptera;Gomphidae). Odonatologica21(2): 241-245.WATSON, M.C., 1956. The utilization of mandibular armature in taxonomic studies of anisopter-ous nymphs. Trans. Am. Ent. Soc. 81: 155-205.

Description of the female and larva of Phyllogomphoides joaquini Rodrigues Capitulo, 1992 (Anisoptera: Gomphidae)

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Description of the female and larva of Phyllogomphoides joaquini Rodrigues Capitulo, 1992 (Anisoptera: Gomphidae)

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