scholarly journals Formation of Pattern and Diagnostic Instar Features of the Head in Caterpillars from Genus Peridea (Lepidoptera, Notodontidae)

2009 ◽  
Vol 43 (1) ◽  
pp. e-15-e-24
Author(s):  
I. Dolinskaya
Keyword(s):  
Pattern Formation ◽  
Larval Instar ◽  
Head Capsule ◽  
Diagnostic Character ◽  
Key To Species ◽  
Larval Instars ◽  
Diagnostic Characters ◽  
Ontogenetic Stages ◽  
First Time ◽  
Taxonomic Relations

Formation of Pattern and Diagnostic Instar Features of the Head in Caterpillars from Genus Peridea (Lepidoptera, Notodontidae) Pattern and colouration of caterpillar head of all larval instar of 7 species from genus Peridea Stephens, 1828 are studied. Formation of caterpillar head pattern in ontogenesis is discussed. Diagnostic characters, both specific and larval instars, are recorded for the first time. Key to species according to larval instars is given. Evidently, only larvae of the 1st instar demonstrate different directions in the pattern formation. This characteristic can be used for clearing of taxonomic relations in the genera and on the earliest ontogenetic stages (1st larval instar) only. In the following (2nd-5th) instars, the pattern became more or less of the same type. It depends on stripes shape or colouration only and can serve as good specific diagnostic character. To determine larval instar, both width of the head capsule and head pattern should be taken into account.

scholarly journals Breaking the rule: Five larval instars in the podonomine midge Trichotanypus alaskensis Brundin from Barrow, Alaska

2018 ◽  
Author(s):  
Alec R. Lackmann ◽  
Malcolm G. Butler
Keyword(s):  
Life Cycle ◽  
Larval Instar ◽  
Adult Emergence ◽  
Head Capsule ◽  
The Arctic ◽  
Larval Instars ◽  
Daily Monitoring ◽  
Field Samples ◽  
Standard Life ◽  
Capsule Size

Except for one unconfirmed case, chironomid larvae have been reported to pass through four larval instars between egg and pupal stages. We have observed a fifth larval instar to be a standard life-cycle feature of the podonomine Trichotanypus alaskensis Brundin 1966 in tundra ponds on the Arctic Coastal Plain near Barrow, Alaska. T. alaskensis has a one-year life cycle in these arctic ponds. Adults emerge in June ~2-3 weeks after pond thaw, then mate and oviposit; most newly-hatched larvae reach instar IV by October when pond sediments freeze. Overwintering larvae complete instar IV within a few days of thaw, then molt again to a fifth larval instar. Imaginal discs, normally seen only during instar IV in Chironomidae, develop across both instars IV & V prior to pupation and adult emergence. While monitoring larval development post-thaw in 2014, we noticed freshly-molted T. alaskensis larval exuviae a week or more prior to any pupation by that species. In 2015-16 we reared overwintering instar IV larvae from single pond sources, individually with daily monitoring, through molts to instar V, pupa, and adult. Some overwintering instar II and III larvae were reared as well, but were few in number. During 2016 we also reared T. alaskensis progeny (from eggs) through instar II, thus documenting head capsule size ranges for all five instars in a single pond’s population. Without individual rearings, the fifth larval instar was not readily apparent for two reasons: 1) The molt itself occurs immediately after thaw and is so synchronous it is difficult to discern in daily field samples. 2) The head capsule size increment between instars IV-V is much lower than the ratio predicted by the Brooks-Dyar Rule. Up through instar IV, the Brooks-Dyar ratio for T. alaskensis ranged 1.30-1.61, but during the IV-V molt head capsule dimensions (sexes pooled) increased by a ratio of 1.09 – comparable to the magnitude of sexual dimorphism in head capsule size within each of the final two larval instars. Individual rearings coupled with 2014-2016 field surveys in nine other ponds suggest that five larval instars is an obligatory trait of this species at this location. As this is the first confirmed case of five larval instars in a chironomid, the phylogenetic uniqueness of this trait needs further investigation.

scholarly journals Review of the congrid eel genus Conger (Anguilliformes: Congridae) in Taiwan

Zootaxa ◽  
2018 ◽  
Vol 4454 (1) ◽  
pp. 168 ◽  
Author(s):  
DAVID G. SMITH ◽  
HSUAN-CHING HO
Keyword(s):  
Mature Male ◽  
Detailed Data ◽  
Key To Species ◽  
Male Specimen ◽  
Diagnostic Characters ◽  
Conger Myriaster ◽  
First Time

The congrid eel genus Conger in Taiwan is reviewed. Five species are recognized, including C. jordani, C. cinereus, C. macrocephalus, C. myriaster and a newly collected species, C. philippinus. A mature male specimen of Conger myriaster is described for the first time. Specimens previously identified as C. japonicus (= C. myriaster) were misidentifications of above mentioned species. The diagnostic characters are discussed. Detailed data on all five species and a key to species in Taiwan are provided.

Six new Stenus species of the cirrus group (Coleoptera, Staphylinidae) from China with a key to species of the group

Zootaxa ◽  
2008 ◽  
Vol 1745 (1) ◽  
pp. 1
Author(s):  
TANG LIANG ◽  
YUN-LONG ZHAO ◽  
VOLKER PUTHZ
Keyword(s):  
New Species ◽  
Key To Species ◽  
Diagnostic Characters ◽  
First Time

Six new Stenus species of the cirrus group are described from China: S. zhulilongi Tang & Puthz, sp. nov., S. jiulongshanus Tang & Puthz, sp. nov. and S. shenshanjiai Tang & Puthz, sp. nov. from Zhejiang Prov., S. lijinweni Tang & Puthz, sp. nov. from Zhejiang and Jiangxi Prov., S. flammeus Tang & Puthz, sp. nov. and S. bostrychus Tang & Puthz, sp. nov. from Sichuan Prov., and their diagnostic characters are illustrated. The male of S. cirrus L. Benick, 1940 was found and illustrated for the first time. A key to species of the cirrus group is provided. All six new species have diagnostic characters of the subgenus Hypostenus. Some species of this group, including S. cirrus, fit the concept of the subgenus Hemistenus.

Re-description of larvae of Chostonectes nebulosus (Macleay, 1871) (Coleoptera: Dytiscidae, Hydroporinae, Hydroporini, Sternopriscina) with an identification key to the known larvae of Chostonectes Sharp, 1882

Zootaxa ◽  
2020 ◽  
Vol 4718 (3) ◽  
pp. 436-446
Author(s):  
EDWARD TSYRLIN ◽  
MELISSA CAREW ◽  
YVES ALARIE
Keyword(s):  
Abdominal Segment ◽  
Head Capsule ◽  
Identification Key ◽  
Molecular Approach ◽  
Larval Instars ◽  
First Time

The second and third larval instars of the Australian endemic dytiscid Chostonectes nebulosus (Macleay, 1871) are described and illustrated for the first time including a detailed chaetotaxic analysis of head capsule and appendages, legs, last abdominal segment and urogomphi. Collected larvae were successfully associated with adults using rearing and a molecular approach. The identification key and COI barcodes for C. nebulosus, C. gigas (Boheman, 1858) and C. johnsonii (Clark, 1862) are provided. 

Integrating phylogeny, ontogeny and systematics of the mite family Smarididae (Prostigmata, Parasitengona): Classification, identification key, and description of new taxa

2021 ◽  
Vol 26 (1) ◽  
pp. 85-123
Author(s):  
Samuel Geremias Dos Santos Costa ◽  
Cal Welbourn ◽  
Pavel Klimov ◽  
Almir Rogério Pepato
Keyword(s):  
New Species ◽  
Type Species ◽  
New Genus ◽  
Larval Instar ◽  
Morphological Characters ◽  
Larval Morphology ◽  
Key To Species ◽  
Larval Instars ◽  
Two New Species ◽  
Mite Family

Unlike most terrestrial parasitengone mites (chiggers, erythraeids), known mostly from parasitic and easy-to-collect larvae, smaridid systematics are mainly based on the post larval instar. Larvae are rarely collected, and their biology and host associations are virtually unknown. Here we infer phylogenetic relationships of Smarididae based on 50 morphological characters using both larval and post larval instars, including data on the larval morphology of Trichosmaris obtained through rearing. The subfamily Smaridinae, as currently understood, was recovered paraphyletic: the genus Smaris was rendered as basal smaridid lineage, while the genus Fessonia (Smaridinae) was sister to Hirstiosomatinae, albeit with moderate support. Our analysis suggests that the genus Surasmaris Southcott, 1995 is a junior synonym of Trichosmaris Southcott, 1963 (syn. nov.), and two Sphaerotarsus species should be placed into Hirstiosoma: Hirstiosoma baenai (Mayoral & Barranco, 2017) comb. nov., Hirstiosoma quercus (Yazdanpanah, Saboori & Hakimitabar, 2016) comb. nov. Sphaerotarsus monticolus Southcott, 1997 and S. leptopilus were recovered as independent lineages, and hence, a new genus Southcottiana gen. nov. is proposed to include Southcottiana monticola comb. nov (Southcott, 1997). We describe two new species, Trichosmaris paulensis sp. nov. (adults, larvae) and T. calcarensis sp. nov. (larva), and present the first description of larval T. dispar, the type species of Trichosmaris, previously known only from post larval instars. Based on the above results, we give a key to larval genera of Smarididae and a key to species of Trichosmaris (larval and postlarval instars).

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 Determination of Helicoverpa armigera (Lepidoptera: Noctuidae) larval instars and age based on head capsule width and larval weight

2017 ◽  
Vol 15 ◽  
pp. 53 ◽  
Author(s):  
D. G. Stavridis ◽  
C. G. Ipsilandis ◽  
P. C. Katarachias ◽  
P. G. Milonas ◽  
A. A. Ifoulis ◽  
...  
Keyword(s):  
Body Weight ◽  
Helicoverpa Armigera ◽  
Larval Instar ◽  
Head Capsule ◽  
Head Width ◽  
Larval Instars ◽  
Head Capsule Width ◽  
Helicoverpa Armígera ◽  
L1 And L2 ◽  
Lepidoptera Noctuidae

Larνae of Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae) were reared in laboratory conditions (26°C, 16:8 L:D) and measurements of larval head capsule width, and body weight, were used in order to determine the boundaries of larval instars. Larvae of Η. armigera completed development in 5 to 7 instars. Head capsule width could predict the larval instar only for Ll. The upper boundary of head width for L1 was 0.4mm. Body weight could predict both L1 and L2 larval instars. Boundaries between L1-L2 instars were found to be 1 mg and for L2-L3 5,5 mg. Correlation and regression analysis suggest that a combination of head capsule width and body weight can predict both larval instars and chronological age under constant conditions in the laboratory.

Review of the Patrus landaisi species group from Thailand with description of three new species (Coleoptera, Gyrinidae)

Zootaxa ◽  
2021 ◽  
Vol 4991 (3) ◽  
pp. 561-591
Author(s):  
BENJAMART SUKSAI ◽  
GREY T. GUSTAFSON ◽  
ROBERT W. SITES ◽  
NARUMON SANGPRADUB
Keyword(s):  
New Species ◽  
Species Group ◽  
Integrative Approach ◽  
Key To Species ◽  
Species Status ◽  
Molecular Analyses ◽  
Diagnostic Characters ◽  
Distribution Maps ◽  
Three New Species ◽  
First Time

A survey of the whirligig beetles of the genus Patrus Aubé, 1838 occurring in Thailand belonging to the newly designated Patrus landaisi species group is presented. Three new species are described and illustrated: P. garuda sp. nov., P. nanensis sp. nov. and P. phetchabunensis sp. nov.; with P. apicalis (Régimbart, 1891), P. landaisi (Régimbart, 1892), and P. subapicalis (Ochs, 1930) stat. nov. being recorded for the first time in Thailand. Morphological and molecular analyses, together in an integrative approach, support the elevation of P. subapicalis to species status, instead of being a subspecies of P. apicalis. A diagnosis, illustrations of habitus and diagnostic characters, distribution maps, habitat images and a key to species are provided for all known members of the P. landaisi species group that occur in Thailand. A checklist of species in the group is also given.  

World revision of the wasp genus Liosphex Townes, 1977 (Hymenoptera: Rhopalosomatidae)

Zootaxa ◽  
2010 ◽  
Vol 2384 (1) ◽  
pp. 1 ◽  
Author(s):  
VOLKER LOHRMANN ◽  
MICHAEL OHL
Keyword(s):  
New Species ◽  
Costa Rica ◽  
Original Description ◽  
Identification Key ◽  
Southern Brazil ◽  
Key To Species ◽  
Diagnostic Characters ◽  
Distribution Maps ◽  
Type Series ◽  
First Time

The wasp genus Liosphex Townes 1977 is revised and twelve new species are described: Liosphex achuar sp. nov. (Costa Rica, Ecuador, Panama and Peru), L. atratus sp. nov. (Costa Rica and Mexico), L. boreus sp. nov. (Mexico, Kentucky and Mississippi, USA), L. bribri sp. nov. (Costa Rica, Panama and Peru), L. darien sp. nov. (Panama), L. guanabara sp. nov. (Brazil), L. guarani sp. nov. (Brazil and Argentina), L. longicornis sp. nov. (Costa Rica), L. maleku sp. nov. (Costa Rica and Mexico), L. micropterus sp. nov. (southern Brazil and Paraguay), L. quechua sp. nov. (Peru), and L. tupi sp. nov. (Brazil). The male of L. trichopleurum Townes, 1977 is described for the first time. A redescription of L. varius Townes, 1977, including new diagnostic characters, is provided since the original description was based on a heterogeneous type series of specimens from different species. The revision includes images of all fourteen species, illustrations of the main diagnostic characters, an identification key to species and distribution maps for all species.

The Stenus cirrus group (Coleoptera, Staphylinidae) in Fujian, East China

Zootaxa ◽  
2018 ◽  
Vol 4375 (1) ◽  
pp. 105
Author(s):  
SHENG-NAN LIU ◽  
LIANG TANG ◽  
YONG-TING LUO
Keyword(s):  
New Species ◽  
East China ◽  
Key To Species ◽  
Fujian Province ◽  
Diagnostic Characters ◽  
Two New Species ◽  
First Time

Species of the Stenus cirrus group in Fujian Province, East China, are reviewed and two new species are described: S. mangdangshanus sp. n. and S. fujianensis sp. n. The females of S. cooterianus Puthz, 2003 and S. wuyiensis Puthz, 2003 are discovered and illustrated for the first time. The diagnostic characters of the new species are illustrated, and a key to species of the Stenus cirrus group of Fujian Province is provided. 

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