Phyllogomphoides annectens (Selys): description of the last instar with a key to the South American species (Anisoptera: Gomphidae)

4 Pages·1999·0.71 MB·English

by  Costa, J M

Odonalologica28(1): 79-82 March I, 1999
SHORT COMMUNICATIONS
Phyllogomphoidesannectens(Selys):
descriptionof thelast instar withakey
to theSouthAmerican species
(Anisoptera: Gomphidae)
J.M.Costa,T.C.Santos &A.M.Telles
DepartamentodeEntmologia,Museu Nacional,Universidade Federal do Riode Janeiro,
QuintadaBoa Vista,BR-20942-040 Rio deJaneiro, Rio de Janeiro,Brazil
e-mail:[email protected]
ReceivedJune 18,1998/Revised andAcceptedAugust 10, 1998
Description andillustrationsarepresented,based onmaterial reared inthe labora-
tory.A key tothe immature forms ofthe South American Phyllogomphoidesis pro-
vided.
INTRODUCTION
The genusPhyllogomphoides Belle, 1970, is composed of45 species in the
Neotropical Region (BELLE, 1970, 1982, 1984, 1991, 1992, 1993, 1994;GARRI-
SON, 1991; NEEDHAM, 1904, 1911, 1940, 1941, 1944; NOVELO, 1993;
RAMIREZ, 1996;RODRIGUES CAPITULO, 1992),29oftheseinSouthAmerica.
P. annectens is known only in Brazil (BELLE, 1970). N.D. Santos and J.M.
Costa collected oneexample in its last instar, in theReserva de Tingua, Rio de
Janeiroon 10-VIII-1973,whichwas rearedinSantos’laboratory andwhichemerged
on 25-IX-I973, andis describedherein.
In 1992, this example was loaned to Belle, and was identifiedby him as
Phyllogomphoides annectens.
NOVELO-GUTIERREZ (1993) definesthe existence oftwo main lineages in
Phyllogomphoides, oneSouthAmerican,theotherMiddleAmerican,eachcharac-
terizedby larval morphology. P. annectens ispart ofthe SouthAmerican lineage
anditis includedinthegroupannectens described by BELLE (1982).
80 J.M.Costa,T.C.Santos&A.M.Telles
DESCRIPTION
Material.-!exuviae (rearedandpreservedinalcohol70%),RiodeJaneiro, ReservadeTingua,
I0-VI1I-I973, N.D.Santos andJ.M.Costa leg.;in collection ofMuseu Nacional. Rio de Janeiro.
H ead.- Widerthan long, withthreewhitishocelli.Antennae4-jointed(Fig. 2),
the third the longest and longer than wide, slightly flat; the fourth the smallest;
proportion of antennomeres: 0.3, 0.2, 0.9, 0.15. All antennomeres coveredwith
long thinsetae.Posteriormarginofheadslightly concave (Fig. 1). Fronsand ver-
tex withoutsetae,thesepresentonlateralandposterior borderoflabrum.Labium
lightbrown,articulationofpostmentumandprementumreachinganteriormargin
ofthemesocoxae. Prementumsmooth(Fig. 3), slightly triangular. Ligula convex,
witharowofrobust, mediumtruncatedscale-likesetae,allofthesamesize.Palpal
Figs 1-7.Phyllogomphoidesannectens (Selys, 1809),structural featuresoftheultimatelarval instar:
(1)ultimateinstar,generalaspect;- (2)antenna;- (3)prementum, dorsalview;- (4)rightmandible;
- (5)left mandible; - (6)maxilla;- (7)abdomen,lateral view.
LarvaofPhyllogomphoidesannedens 81
lobe withend-hook strongly pointed andslightly curved inwardandwithinternal
margin smooth;externallateralmargin smooth(Fig. 3).Mandiblesbiramous(Figs
4,5), external branch ofright mandiblewith five cuspids, theexternal twice the
sizeoftheinternals; internalbranchwithtwo strongcuspids,ofthesamesize(Fig.
4).Leftmandiblewithfourcuspids onexternalbranch,theinternalwithtwo small
cuspids (Fig.5). Maxillaewithseven long incurvedhooks on thelaciniae(Fig.6);
galeae withlong setae.
Thorax.-Pronotumslightlysquarewithtwo spiracles attheposterior margin.
Wing cases parallel, reaching baseofabdominalsegmentfour (Fig. 1).Profemur
andmesofemurshortandflattenedlaterallyandthickerthanthe tibiae,apical part
ofanteriorandmiddletibiaewithonespine (Fig. 1).blindlegs flattenedlaterally.
Tarsalformula2-2-3.
Abdomen.- Elongated, withoutsetae(Fig. 1).Tergites 3-9withdorsalhooks,
graduallyincreasing insizerearward(Fig. 7),thoseon7-9slightly overlapping the
next segment;segment 10as longas 9; segments7-9withlateralspines, largeston
9, all straight. Caudal appendages all the same size, apical parts acutely pointed
and darkbrown incolor.
Measurements (inmm).- Totallength30.0;- abdomen23.0;- abdomenmaximumwidth
4.0;- widthofheadacrosseyes 5.0;- hindfemur4.0;- prementum width 3.5,length4.5,
BIOLOGY. - The larvawas collectedfrom asmall sandy creek thatruns through
Reserva de Tingua, inthe Atlanticforest, ingrass andsecondary vegetation. The
place wherethelarvawascollected hadno vegetation covering. Thelarvawasfed
withCulicidaelarvae.Emergence happened 15 daysafteritscapture.
KEY TO KNOWN IMMATUREFORMS OF PHYLLOGOMPHOIDES
OF SOUTH AMERICA
1 Abdominaldorsal hooks presentonsegments 2-9 2
1' Abdominaldorsalhooks present on segments 3-9;anteriorandmiddletibiaewith spines;labial
palpuswith inner marginsmooth;total length30mm annectens
2 Palpallobewithendhookaslongasmoveablehook;both curved inward 3
2' Palpallobewithendhook smaller thanmoveable hook 4
3 Abdominal segment 10slightlylongerthan 9;spine ofsegment 9slightlydivergent;total length
44mm major
3' Abdominalsegment 10aslongas9;spineofsegment 9convergent; total length37.5 mm
ffuulllliiggiinnoossuuss
4 Palpallobe with asingletooth;total length27 mm; abdomen 18mm andromeda
4' Palpallobewithtwoteeth 5
5 Palpallobeendhookwithtwo smallteethofthesamesize; abdominal segment 10aslongas9;
total length28mm Iundulatus
5' Palpallobeendhook withsecond tooth smallerthanfirst;abdominalsegment 10longerthan9;
total length35mm cristatus
82 J.M.Costa,T.C.Santos& A.M.Telles
ACKNOWLEDGEMENTS
Wewish tothank DrJ,BELLE, who identified theemergedspecimen.Wewould like tothank L.A.
ALVES COSTAforthe drawingsthatillustrate thisarticle. Thisresearch wassupportedby CNPq and
FUJB.
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