Larval chaetotaxy and morphometry of Megasternini: Cercyon (Paracercyon) Seidlitz, Cryptopleurum Mulsant and Pelosoma Mulsant (Coleoptera: Hydrophilidae) Author Rodriguez, Georgina Facultad de Ciencias Exactas y Naturales, Departamento de Biodiversidad y Biología Experimental, Universidad de Buenos Aires - Instituto de Biodiversidad y Biología Experimental y Aplicada (IBBEA), CONICET-UBA, Laboratorio de Entomología, Intendente Güiraldes 2160, C 1428 EGA, Buenos Aires, Argentina. Author Archangelsky, Miguel Laboratorio de Investigaciones en Ecología y Sistemática Animal (LIESA). Centro de Investigaciones Esquel de Montaña y Estepa Patagónica (CIEMEP) (CONICET - UNPSJB), Roca 780, 9200 Esquel, Chubut, Argentina. text Zootaxa 2023 2023-07-18 5318 1 45 66 http://dx.doi.org/10.11646/zootaxa.5318.1.2 journal article 56254 10.11646/zootaxa.5318.1.2 7a8efce2-7361-4f58-96dc-a7d4b28f18d9 1175-5326 8158191 FE580DA6-5B95-4682-85F5-09376D4F13BE
TABLE 2. Comparative table of selected morphologic and chaetotaxic characters among known Megasternini larvae. Megasternum is not included since the original larval description does not include chaetotaxic characters (Quennedey, 1965).
CharacterArmostusCercyonMegasternini Cryptopleurum MotonerusOosternumPelosoma
Stemmataarranged in one spotarranged in one or two spotsarranged in one spotarranged in one spotarranged in one spotarranged in one spot
FR1 length (L3)longshortshortlonglongshort
FR5-FR6closely groupedclosely groupedclosely groupednot closely groupedclosely groupedclosely grouped
FR8-10arranged in a trianglearranged in a trianglearranged in a trianglearranged in a transverse rowarranged in a transverse rowarranged in a triangle
FR12shortminuteminuteminuteminuteshort
PA12-14not closely groupedclosely groupedclosely groupedclosely groupedclosely groupednot closely grouped
PA17between PA16 and PA26between or distal to PA26distal to PA26between PA16 and PA26distal to PA26between PA16 and PA26
gANat least 1 long sensoriumat least 1 long sensoriumat least 1 long sensoriumall sensoria shortat least 1 long sensoriumat least 1 long sensorium
Basal 2° setae on MN (L3)222122
Additional pores on mandiblepresent distallyabsentabsentabsentabsentabsent
# of setae gMX2 right /left (L3)7/77–8/7–96/65/98/88/8
MX13-14 (L3)MX13 much longerMX13 much longerMX13 much longersubequal in lengthsubequal in lengthMX13 much longer
MX15presentpresentpresentabsentpresentpresent
MX26presentpresentpresentabsentpresentpresent
MX27presentpresentpresentabsentpresentpresent
Submentumvery widenarrowernarrowervery widenarrowernarrower
Prementumsclerotizedsclerotizedsclerotizedapparently membranoussclerotizedsclerotized
LA5pore-like?minuteminutelongminuteminute
Legs2-segmented1 or 2- segmentedunsclerotized1-segmentedunsclerotized3-segmented