scholarly journals Morphology of immature stages of Helophorus (Gephelophorus) auriculatus (Coleoptera, Helophoridae)

2020 ◽  
Vol 60 (1) ◽  
pp. 319-332 ◽  
Author(s):  
Yusuke N. Minoshima ◽  
Reiya Watanabe
Keyword(s):  
Head Capsule ◽  
Immature Stages ◽  
Taxonomic Character ◽  
Larval Instars ◽  
Larval Stages ◽  
First Instar ◽  
Egg Case ◽  
Morphological Transformations

The morphology of immature stages of Helophorus (Gephelophorus) auriculatus Sharp, 1884 is described. This is the first description of the larva and pupa of the subgenus Gephelophorus Sharp, 1915. We describe the morphology of the egg-case, all larval stages (first to third instar, including chaetotaxy of the head) and pupa. Morphological transformations between larval instars were examined. Head chaetotaxy was nearly identical between instars. Ventral teeth on the nasale, considered as a useful taxonomic character, were absent in the first instar but well developed in later instars. Chaetotaxy differed among the subgenera Gephelophorus, Helophorus and Lihelophorus in the length and shape of setae on head capsule and maxilla. Pupal morphology was similar to that of previously described pupae: H. (Helophorus) aquaticus (Linnaeus, 1758) and H. (Rhopalohelophorus) orientalis Motschulsky, 1860. A key to families of the Hydrophiloidea of Japan based on larval characters is provided.

scholarly journals Descriptions of immature stages of Octodonta nipae (Maulik) (Coleoptera, Chrysomelidae, Cassidinae, Cryptonychini)

ZooKeys ◽  
2018 ◽  
Vol 764 ◽  
pp. 91-109 ◽  
Author(s):  
Ling-fei Peng ◽  
Jin-lei Li ◽  
You-ming Hou ◽  
Xiang Zhang
Keyword(s):  
Invasive Species ◽  
Electron Micrographs ◽  
Head Capsule ◽  
Scanning Electron Micrographs ◽  
Immature Stages ◽  
Larval Instars ◽  
Palm Trees ◽  
Scanning Electron

Octodontanipae(Maulik, 1921), a hispid that damages several species of palm trees, was introduced accidently into China in 2001. The egg, larva, prepupa and pupa ofO.nipaeare illustrated and described in detail and compared with another invasive species,Brontispalongissima(Gestro, 1885); the scanning electron micrographs of the head capsule, antenna, maxilla, labium and lateral scoli are provided, as well as photos of body of all larval instars and pupa. It is the second description of immature stages in the genusOctodontaChapuis.

LIFE HISTORY AND HABITS OF THE WILLOW BEAKED GALL MIDGE, MAYETIOLA RIGIDAE (DIPTERA: CECIDOMYIIDAE), IN MICHIGAN

1968 ◽  
Vol 100 (2) ◽  
pp. 202-206 ◽  
Author(s):  
Louis F. Wilson
Keyword(s):  
Life History ◽  
Gall Midge ◽  
Head Capsule ◽  
Instar Larva ◽  
Larval Instars ◽  
The Third ◽  
First Instar ◽  
Salix Discolor

AbstractThe willow beaked gall midge, Mayetiola rigidae (Osten Sacken), is univoltine in Michigan. Adults emerge from bud galls on Salix discolor Mühl. and other willows on mornings of warm days in early April. Eggs are laid singly on or near the buds of the host. Head capsule measurements indicate three larval instars. The last two instars each possess a spatula. The first-instar larva emerges in late April and penetrates the soft bud tissues. The gall begins to develop at the beginning of the second instar in mid-May. The third instar appears in early July and continues to enlarge the gall until fall. Prior to overwintering, the larva lines the inner chamber of the gall with silk and constructs one to seven silken septa across the passageway. Pupation occurs in mid-March. The gall deforms the stem and occasionally a galled branch dies or breaks off.

scholarly journals On the immature stages of the crazy ant Paratrechina longicornis (Latreille 1802) (Hymenoptera: Formicidae)

Zootaxa ◽  
2007 ◽  
Vol 1503 (1) ◽  
pp. 1-11 ◽  
Author(s):  
EDUARDO GONÇALVES PATERSON FOX ◽  
DANIEL RUSS SOLIS ◽  
CARLOS MASSURETTI DE JESUS ◽  
ODAIR CORREA BUENO ◽  
ANTONIO TENIYOSHI YABUKI ◽  
...  
Keyword(s):  
Original Description ◽  
Immature Stages ◽  
Larval Instars ◽  
Larval Stages ◽  
The World ◽  
Paratrechina Longicornis ◽  
First Time ◽  
Evident Variation ◽  
Third Instar Larvae

The ant Paratrechina longicornis is a cosmopolitan ant species that has been accidentally spread by commerce around the world, and now is a pest of houses and hospitals. The morphology of its larval stages has been previously described without knowledge of the number of instars. The present study revisits the original description of P. longicornis larvae by adding differences observed among the three larval instars. Compared to other Paratrechina species studied so far, P. longicornis presents smaller larvae, less evident variation in mandible morphology, and clear variation in the morphology of head hairs between the analysed specimens of the second and third instar larvae. Ultrastructural images of the eggs, larval spiracle ornamentation, and pupae are also presented for the first time.

Determination of Larval Instars of Semanotus bifasciatus (Coleoptera: Cerambycidae) Based on Frequency Distributions of Morphological Variables

2020 ◽  
Vol 55 (3) ◽  
pp. 405-415
Author(s):  
Na Li ◽  
Lei Wu ◽  
Yongxin Geng ◽  
Danfeng Wei ◽  
Min Chen
Keyword(s):  
Body Length ◽  
Larval Instar ◽  
Head Capsule ◽  
Larval Instars ◽  
Frequency Distributions ◽  
Larval Stages ◽  
Field Investigations ◽  
Mandible Length ◽  
Morphological Variables

Abstract Semanotus bifasciatus Motschulsky (Coleoptera: Cerambycidae) is one of the most destructive pests of Platycladus trees in China. Morphological measurements, such as head capsule (HC) width, can be very useful and practical indicators for identifying larval instars of coleopteran species. In this study, six morphological variables, including HC width, pronotum width, mandible length and width, and body length and width were measured to determine the instars of field-collected larvae of S. bifasciatus. Both the HC width and pronotum width were reliable parameters for determining the instar and stage. Larvae of S. bifasciatus were divided into eight instars; we detected strong relationships between larval instar and both the HC width (R2 = 0.9640) and pronotum width (R2 = 0.9549). The ranges of body widths and lengths for each instar are provided as reference values for distinguishing among larval stages in field investigations.

scholarly journals Characterization of the larval stages of Alphitobius diaperinus (Panzer) (Coleoptera: Tenebrionidae) using head capsule width

2001 ◽  
Vol 61 (1) ◽  
pp. 125-131 ◽  
Author(s):  
O. FRANCISCO ◽  
A. P. do PRADO
Keyword(s):  
Age Structure ◽  
Developmental Rate ◽  
Head Capsule ◽  
Larval Instars ◽  
Alphitobius Diaperinus ◽  
Larval Stages ◽  
Mean Width ◽  
The Mean ◽  
Coleoptera Tenebrionidae

The mean width (n = 5) of the cephalic capsule instar of Alphitobius diaperinus was determined. The larvae were reared at 27ºC (± 0.1ºC). The result showed that A. diaperinus has eight larval instars. The head capsule of the 1st instar larvae measured x = 0.228 (SD = 0.0192) and the last instar larval measured x = 1.339 (SD = 0.0436). The developmental rate, determined by Dyar-Hutchinson's rule, was 1.29. These data may be useful for studies on phenology and age structure of A. diaperinus in the field.

Biology and morphology of immature stages of Meteorus trachynotus Vier. (Hymenoptera: Braconidae)

1990 ◽  
Vol 68 (5) ◽  
pp. 1000-1004 ◽  
Author(s):  
J. C. Thireau ◽  
J. Régnière ◽  
C. Cloutier
Keyword(s):  
Average Duration ◽  
Choristoneura Fumiferana ◽  
Pupal Stage ◽  
Instar Larva ◽  
Immature Stages ◽  
Head Region ◽  
Larval Stages ◽  
First Instar ◽  
Immature Development ◽  
First Time

The immature stages of Meteorus trachynotus Vier., developing in larvae of Choristoneura fumiferana (Clem.), are described. The egg of M. trachynotus is of the stalked type. There are three larval stages. The first instar has a caudal appendage which stops growing in the second instar and is lost when the larva exits from the host in the third instar. Only the first and third instars have sclerotized structures. The head region of the first instar bears a pair of hooklike appendages which are described for the first time. Cephalic sclerites of the last instar larva of other species of Meteorus are compared with those of M. trachynotus. The average duration of immature development at 23 °C was 18 days, the egg stage lasted 3 days, the first, second, and third instars lasted 5, 2.5, and 2.5 days, respectively, and the pupal stage lasted 5 days.

The immature stages of Tropisternus (Pleurhomus) sahlbergi (Sharp) (Coleoptera: Hydrophilidae), with considerations on the primary chaetotaxy of Tropisternus Soliera

Zootaxa ◽  
2011 ◽  
Vol 2777 (1) ◽  
pp. 25 ◽  
Author(s):  
PATRICIA L. M. TORRES ◽  
MARIANO C. MICHAT ◽  
MIGUEL ARCHANGELSKY
Keyword(s):  
Dorsal Surface ◽  
Head Capsule ◽  
Color Pattern ◽  
Preliminary Evidence ◽  
Immature Stages ◽  
Preimaginal Stages ◽  
Short Seta ◽  
Egg Case ◽  
First Time ◽  
Current Standards

The preimaginal stages of Tropisternus (Pleurhomus) sahlbergi (Sharp, 1883) are described for the first time, including illustrations and photographs of the egg case, all larval instars and pupa. The descriptions emphasize on the morphometry and chaetotaxy, following current standards in larval descriptions within Hydrophilidae. Preliminary evidence is presented for a placement of Pleurhomus Sharp, 1833 within Tropisternus Solier, 1834, in agreement with a recent phylogenetic analysis based on adult characters. Tropisternus (P.) sahlbergi is characterized by a brown to dark brown head capsule without color pattern, mandibles with strongly serrated inner margins, a short seta PA11 in comparison to PA14, the absence of seta AN8, the absence of a distal secondary seta on the outer margin of the first maxillary palpomere and the dorsal surface of the mentum almost entirely covered by spinulae.

Description of the larval stages of Heterosternuta diversicornis (Sharp) (Coleoptera: Dytiscidae, Hydroporinae)

1998 ◽  
Vol 29 (1) ◽  
pp. 39-46 ◽  
Author(s):  
Y. Alarie ◽  
K. Fritz
Keyword(s):  
Related Species ◽  
Abdominal Segment ◽  
Close Similarity ◽  
Maximum Width ◽  
Closely Related Species ◽  
Larval Instars ◽  
Larval Stages ◽  
First Instar

AbstractDescription of structures of all three larval instars of Heterosternuta diversicornis (Sharp) is presented. The chaetotaxy and porotaxy of the cephalic capsule, head appendages, legs, last abdominal segment, and urogomphi are discussed in detail. A close similarity between larvae of H. diversicornis, H. wickhami Zaitzev and H. cocheconis (Fall) is confirmed. All three species distinguish from the closely related species of the genus Neoporus Guignot by (i) a very short and constricted siphon, (ii) the primary setae FE8 and FE9 which are subequal in length to the maximum width of the metafemur (first instar), (iii) the absence of natatory setae on all tibiae and tarsi, and (iv) the contiguous position of the primary setae UR2 and UR3 on the urogomphomere 1.

The life history of Caurinus dectes Russell, with a description of the immature stages (Mecoptera: Boreidae)

1982 ◽  
Vol 13 (2) ◽  
pp. 225-235 ◽  
Author(s):  
Loren K. Russell
Keyword(s):  
Life History ◽  
Antennal Segment ◽  
Seasonal Occurrence ◽  
Immature Stages ◽  
Larval Instars ◽  
Egg Diapause ◽  
First Instar ◽  
History Of ◽  
Thoracic Legs

AbstractThe egg, larva, and pupa of Caurinus dectes are described and illustrated. Eggs are ellipsoidal, coated with black cement, and are attached to bryophytes. The larva is orthosomatic, with much-reduced thoracic legs, and further differs from other larval Boreidae in: amphipneustic spiracles, number of stemmata (7), placoid sensilla present in membrane of first antennal segment, and egg burster on frons in first instar. Three larval instars are recognized from analysis of head measurements and partial rearing. Larvae feed in stemmines or galleries in leafy liverworts (Jungermanniales). Pupation occurs in a silk-lined cell or cocoon, otherwise unknown in the Mecoptera; the pupa is exarate, with decticous mandibles. The seasonal occurrence of egg eclosion (February-March), pupation (July-August), and principal adult activity (October-April) is typical for the Boreidae, but only C. dectes is univoltine in this family. Successive annual generations appear to overlap through extended egg diapause and adult perenniation.

BIOLOGY AND IMMATURE STAGES OF LEUCOPIS PIMCOLA AND CHAMAEMYIA POLYSTIGMA (DIPTERA: CHAMAEMYIIDAE)

1973 ◽  
Vol 105 (11) ◽  
pp. 1443-1452 ◽  
Author(s):  
Thomas P. Sluss ◽  
B. A. Foote
Keyword(s):  
Lolium Perenne ◽  
Feeding Habits ◽  
Life Cycles ◽  
Pine Bark ◽  
Larval Feeding ◽  
Immature Stages ◽  
Larval Instars ◽  
Larval Stages ◽  
Rye Grass ◽  
Two Generations

AbstractThe life cycles and larval feeding habits of Leucopis (Neoleucopis) pinicola Malloch and Chamaemyia polystigma Meigen were studied in northeastern Ohio. The larval stages of L. pinicola are predators of the pine bark aphid, Pineus strobi (Hartig) (Homoptera: Adelgidae). Probably there are only two generations a year, and overwintering occurs as mature larvae or pupae that are in diapause. Larvae of C. polystigma prey on the blue grass mealybug, Heterococcus nudus Green (Homoptera: Pseudococcidae), that infests perennial rye grass, Lolium perenne L. This species has three generations a year and overwinters as diapausing mature larvae and pupae.The eggs, three larval instars, and puparia of both species are described and illustrated.

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