THE SALIVARY GLAND CHROMOSOMES OF THREE NORTH AMERICAN SPECIES OF TWINNIA (DIPTERA: SIMULIIDAE)

1966 ◽  
Vol 44 (5) ◽  
pp. 937-943 ◽  
Author(s):  
K. Rothfels ◽  
Margaret Freeman
Keyword(s):  
Salivary Gland ◽  
North American ◽  
North American Species ◽  
Centromere Region ◽  
Standard Sequence ◽  
Chromosome Iii

The salivary gland chromosomes of the three known North American species of Twinnia Stone and Jamnback are described, and compared with those of Prosimulium Roubaud. Twinnia tibblesi S. and J. has the standard arm association and the standard sequence in IS, II, IIIL. It differs from standard in inversions IL-1, IIIS-2,3, and a repatterning of the centromere region of chromosome III. Twinnia nova (Dyar and Shannon) and T. biclavata Shewell share these T. tibblesi traits and, in addition, have, in common, inversion IIIL-1 and a whole arm interchange giving the combinations IIL, IIIL and IIS, IIIS. Twinnia biclavata differs from T. nova by inversion IS-1 and a nucleolar shift. Both are good species. Evidence is presented that Twinnia is phylogenetically intermediate between Gymnopais Stone and the subgenus Helodon Enderlein of Prosimulium.

The salivary gland chromosomes of seven taxa in the subgenus Stegopterna (Diptera, Simuliidae, Cnephia)

1969 ◽  
Vol 47 (1) ◽  
pp. 115-119 ◽  
Author(s):  
D. P. Madahar
Keyword(s):  
Salivary Gland ◽  
North American ◽  
Nucleolar Organizer ◽  
Close Relation ◽  
Standard Sequence ◽  
Y Chromosomes ◽  
Chromosome Ii ◽  
Chromosome I

The salivary gland chromosomes are described for seven taxa in the subgenus Stegopterna Enderlein of Cnephia Enderlein. All taxa have the typical blackfly complement with n = 3. The widely distributed North American Cnephia mutata Malloch has the nucleolar organizer in IL and the standard sequence in IS. All other taxa display a shift of the nucleolus to IS and homozygosity for the inversion IS-1. The Scandinavian C. richteri Enderlein apparently exhibits no further changes, the northern North American C. emergens Stone is characterized by the additional inversions, IS-2, IIIS-1, IIIL-1. The remaining four taxa, designated here as C. "Y", C. "X", C. "O", C. "W" are western North American, presumably undescribed and close to C. mutata. Their close relation to one another is indicated by the sharing of some inversion polymorphisms. They differ in certain floating autosomal inversions, and C. "O" and C. "W" in having distinctive and complex Y-chromosomes, based on chromosome I (C. "O") or chromosome II (C. "W"). A diagram illustrating the cytophylogenetic relations of the seven taxa is presented.

Chironomus blaylocki sp. n. and C. bifurcatus sp. n., North American species near the base of the decorus-group (Diptera: Chironomidae)

Zootaxa ◽  
2009 ◽  
Vol 2023 (1) ◽  
pp. 28-46 ◽  
Author(s):  
WOLFGANG WUELKER ◽  
JON MARTIN ◽  
IYA I. KIKNADZE ◽  
JAMES E. SUBLETTE ◽  
SUSANNE MICHIELS
Keyword(s):  
Salivary Gland ◽  
New Species ◽  
North American ◽  
Polytene Chromosomes ◽  
Distinct Species ◽  
North American Species ◽  
Larval Morphology ◽  
Banding Patterns ◽  
Group Species

Two species of the cytologically defined Chironomus decorus-group, C. bifurcatus sp. n. and C. blaylocki sp. n., are described on the basis of their salivary gland polytene chromosomes and larval morphology, with the associated male and pupa of C. bifurcatus and the putative male of C. blaylocki included as paratypes. The banding patterns of the salivary gland chromosomes indicate that these species are near the base of the cytologically defined decorus-group. The cytology and adults of these new species are compared with those of a number of other undescribed North American decorus-group species to demonstrate that they are distinct species.

THE SALIVARY GLAND CHROMOSOMES OF SIX SPECIES IN THE IIIS-1 GROUP OF PROSIMULIUM ROUB. (DIPTERA: SIMULIIDAE)

1966 ◽  
Vol 44 (4) ◽  
pp. 677-701 ◽  
Author(s):  
P. O. Ottonen
Keyword(s):  
Salivary Gland ◽  
Sex Chromosomes ◽  
North American ◽  
Sex Chromosome ◽  
Chromosomal Polymorphism ◽  
Population Data ◽  
North American Species

The morphology of the salivary gland chromosomes of six North American species of the genus Prosimulium was studied. Five of these species, P. caudatum Shewell, P. dicum Dyar and Shannon, P. "Y", P. magnum D. and S., and P. multidentatum Twinn, share inversion IIIS-1; P. "X" has standard IIIS, but is related to P. caudatum through inversion IIS-10.From an analysis of interspecific rearrangements and intraspecific chromosomal polymorphism, a phylogeny was constructed for this IIIS-1 group of species. The more extensive population data for P. magnum revealed an incipient split of this species into two types of populations, differing in details of the sex chromosomes, and in distribution. Hybrid populations are rare. Sex chromosome polytypism was also observed in P. dicum, P. "Y", and P. multidentatum.

NOTES ON THE GENUS PROTARCHOIDES (HYMEN., ICHNEUMONIDAE)

1938 ◽  
Vol 70 (11) ◽  
pp. 230-232 ◽  
Author(s):  
C. Stuart Walley
Keyword(s):  
North American ◽  
North American Species ◽  
Close Relationship ◽  
Relationship Of

The following notes were assembled in arranging the Protarchoides material in the National Collection. In establishing the identity of Protarchoides mellipes (Prov.) it has been found necessary to synonymize one species. A species allied to mellipes is described as new and a table is provided for the separation of the four known North American species. The recording of Trichiosoma as host for a member of this genus is further evidence of the close relationship of the genus with Protarchus Foer.

The North American Species in Group VII of Ips De Geer (Coleoptera: Scolytidae)

1965 ◽  
Vol 97 (2) ◽  
pp. 193-198 ◽  
Author(s):  
G. R. Hopping
Keyword(s):  
United States ◽  
New Species ◽  
North American ◽  
North American Species ◽  
The North ◽  
Northern United States

AbstractGroup VII of North American Ips contains I. thomasi, new species, I. borealis Swaine and I. swainei R. Hopping. They are less than 4.0 mm. long and females have the front of the head or at least the vertex smooth and shining, impunctate, or with very fine sparse punctures; males are more coarsely granulate-punctate on the frons. The species are described and a key is given. All breed in Picea in Canada and northern United States.

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