This paper reports the first record from Nebraska of the conchostracanEulimnadia diversa (Crustacea: Branchiopoda), which was collected in a shallow pond in Thomas County, Nebraska, USA

McLeod, David S.

English

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University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Transactions of the Nebraska Academy of Sciences and Affiliated Societies Nebraska Academy of Sciences 2000 First Record from Nebraska of the Clam Shrimp Eulimnadia diversa (Crustacea: Branchiopoda: Conchostraca) David S. McLeod University of Nebraska-Lincoln Follow this and additional works at: https://digitalcommons.unl.edu/tnas  Part of the Life Sciences Commons McLeod, David S., "First Record from Nebraska of the Clam Shrimp Eulimnadia diversa (Crustacea: Branchiopoda: Conchostraca)" (2000). Transactions of the Nebraska Academy of Sciences and Affiliated Societies. 55. https://digitalcommons.unl.edu/tnas/55 This Article is brought to you for free and open access by the Nebraska Academy of Sciences at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Transactions of the Nebraska Academy of Sciences and Affiliated Societies by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. 2000. Transactions of the Nebraska Academy of Sciences, 26: 17 NOTE FIRST RECORD FROM NEBRASKA OF THE CLAM SHRIMP EULIMNADIA DIVERSA (CRUSTACEA: BRANCmOPODA: CONCHOSTRACA) David S. McLeod School of Biological Sciences University of Nebraska-Lincoln Lincoln, Nebraska 68588-0118 This paper reports the first record from Nebraska of the conchostracanEulimnadia diversa (Crustacea: Branchiopoda), which was collected in a shallow pond in Thomas County, Nebraska, USA. During the summer of 1998, I collected larval amphibians across Nebraska as a means oftesting for declines in historical populations. While collecting amphibians, particularly in ephemeral and seasonal pools, I commonly encountered repre-sentatives of the three orders ofbranchiopods (Conchostraca, Notostraca, and Anostraca). On 10 July 1998, I sampled a small Sandhills stock pond 12.8 km north of Halsey in Thomas County, Nebraska, for invertebrates and larval amphibians. The collection site measured 34 x 12 m (widest point) and had a maximum water depth of 15 cm. Water was clear and contained emergent vegetation. The mud substrate was un-disturbed, suggesting no recent use by cattle. I acquired the location data using a hand-held Global Positionin~ System unit and county maps (swY4 section 36, T24N R6w: N 42 00.473', w 1000 16.048'). I obtained samples with a 25-cm diameter fine-mesh dip net and preserved them in 10% formalin. Denton Belk (Research Associate, Department of Invertebrate Zool-ogy, Smithsonian Insti tution, Washington, D. C.) identified all my branchiopod specimens. Voucher specimens (NMNH # 243769) are at the National Museum of Natural History, Washington, D.C. I collected Eulimnadia diversa, a conchostracan not pre-viously recorded from Nebraska, from the site described above. Clam shrimps, of the order Conchostraca, are generally described as being encased in a bivalved carapace (Fig. 1) and possessing sessile, compound eyes, a laterally compressed body, and 10-28 pairs oflegs (Fig. 2) (Belk 1982; Pennak 1989). The genus Eulimnadia belongs to the family Limnadiidae and is separated from other conchostracans by a frontal-organ character (Fig. 2) unique to this group (Belk 1982). Belk(1989) discussed the species-specific nature ofthe surface structure of resting eggs for Eulimnadia (Fig. 3). I found Eulimnadia diversa with other common ephem-eral aquatic inhabitants, such as insects ofthe orders Hemi-ptera and Coleoptera. The only vertebrate found was an Ornate Box Turtle (Terrapene ornata). ACKNOWLEDGMENTS This project was funded in part by the United States Geological Survey's Biological Resources Division and the Lower Loup Natural Resource District. Denton Belk gra-ciously identified all the large branchiopod specimens from my field work and provided guidance and technical information 17 during the preparation of this work. John D. Lynch encour-aged me to look for the fascinating creatures while I collected tadpoles. Figure 1-3. 1. External carapace anatomy of Eulimnadia diversa. 2. Eulimnadia diversa: one valve removed. Arrow indicates frontal organ characteristic of the genus Eulimnadia. 3. External resting-egg shell morphology. LITERATURE CITED Belk, D. 1982. Synopsis and Classification of Living Organ-isms: Branchiopoda, pp.174-180. New York, McGraw-Hill Book Co. --. 1989. Identification of species in the conchostracan genus Eulimnadia by egg shell morphology. Journal of Crustacean Biology 9 (1): 115-125. Pennak, R.W. 1989. Fresh-water Invertebrates of the United States. Protozoa to Mollusca, 3rd ed., pp. 362-365. New York, John Wiley and Sons, Inc. 

First Record from Nebraska of the Clam Shrimp \u3ci\u3eEulimnadia diversa\u3c/i\u3e (Crustacea: Branchiopoda: Conchostraca)

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University of Nebraska - Lincoln 
DigitalCommons@University of Nebraska - Lincoln 
Transactions of the Nebraska Academy of 
Sciences and Affiliated Societies Nebraska Academy of Sciences 
2000 
First Record from Nebraska of the Clam Shrimp Eulimnadia 
diversa (Crustacea: Branchiopoda: Conchostraca) 
David S. McLeod 
University of Nebraska-Lincoln 
Follow this and additional works at: https://digitalcommons.unl.edu/tnas 
 Part of the Life Sciences Commons 
McLeod, David S., "First Record from Nebraska of the Clam Shrimp Eulimnadia diversa (Crustacea: 
Branchiopoda: Conchostraca)" (2000). Transactions of the Nebraska Academy of Sciences and Affiliated 
Societies. 55. 
https://digitalcommons.unl.edu/tnas/55 
This Article is brought to you for free and open access by the Nebraska Academy of Sciences at 
DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Transactions of the 
Nebraska Academy of Sciences and Affiliated Societies by an authorized administrator of 
DigitalCommons@University of Nebraska - Lincoln. 
2000. Transactions of the Nebraska Academy of Sciences, 26: 17 
NOTE 
FIRST RECORD FROM NEBRASKA OF THE CLAM SHRIMP 
EULIMNADIA DIVERSA (CRUSTACEA: BRANCmOPODA: CONCHOSTRACA) 
David S. McLeod 
School of Biological Sciences 
University of Nebraska-Lincoln 
Lincoln, Nebraska 68588-0118 
This paper reports the first record from Nebraska of the 
conchostracanEulimnadia diversa (Crustacea: Branchiopoda), 
which was collected in a shallow pond in Thomas County, 
Nebraska, USA. 
During the summer of 1998, I collected larval amphibians 
across Nebraska as a means oftesting for declines in historical 
populations. While collecting amphibians, particularly in 
ephemeral and seasonal pools, I commonly encountered repre-
sentatives of the three orders ofbranchiopods (Conchostraca, 
Notostraca, and Anostraca). On 10 July 1998, I sampled a 
small Sandhills stock pond 12.8 km north of Halsey in Thomas 
County, Nebraska, for invertebrates and larval amphibians. 
The collection site measured 34 x 12 m (widest point) and had 
a maximum water depth of 15 cm. Water was clear and 
contained emergent vegetation. The mud substrate was un-
disturbed, suggesting no recent use by cattle. I acquired the 
location data using a hand-held Global Positionin~ System 
unit and county maps (swY4 section 36, T24N R6w: N 42 00.473', 
w 1000 16.048'). I obtained samples with a 25-cm diameter 
fine-mesh dip net and preserved them in 10% formalin. Denton 
Belk (Research Associate, Department of Invertebrate Zool-
ogy, Smithsonian Insti tution, Washington, D. C.) identified all 
my branchiopod specimens. Voucher specimens (NMNH # 243769) 
are at the National Museum of Natural History, Washington, 
D.C. 
I collected Eulimnadia diversa, a conchostracan not pre-
viously recorded from Nebraska, from the site described 
above. Clam shrimps, of the order Conchostraca, are generally 
described as being encased in a bivalved carapace (Fig. 1) and 
possessing sessile, compound eyes, a laterally compressed 
body, and 10-28 pairs oflegs (Fig. 2) (Belk 1982; Pennak 1989). 
The genus Eulimnadia belongs to the family Limnadiidae and 
is separated from other conchostracans by a frontal-organ 
character (Fig. 2) unique to this group (Belk 1982). Belk(1989) 
discussed the species-specific nature ofthe surface structure of 
resting eggs for Eulimnadia (Fig. 3). 
I found Eulimnadia diversa with other common ephem-
eral aquatic inhabitants, such as insects ofthe orders Hemi-
ptera and Coleoptera. The only vertebrate found was an 
Ornate Box Turtle (Terrapene ornata). 
ACKNOWLEDGMENTS 
This project was funded in part by the United States 
Geological Survey's Biological Resources Division and the 
Lower Loup Natural Resource District. Denton Belk gra-
ciously identified all the large branchiopod specimens from my 
field work and provided guidance and technical information 
17 
during the preparation of this work. John D. Lynch encour-
aged me to look for the fascinating creatures while I collected 
tadpoles. 
Figure 1-3. 1. External carapace anatomy of Eulimnadia 
diversa. 2. Eulimnadia diversa: one valve removed. Arrow 
indicates frontal organ characteristic of the genus Eulimnadia. 
3. External resting-egg shell morphology. 
LITERATURE CITED 
Belk, D. 1982. Synopsis and Classification of Living Organ-
isms: Branchiopoda, pp.174-180. New York, McGraw-
Hill Book Co. 
--. 1989. Identification of species in the conchostracan 
genus Eulimnadia by egg shell morphology. Journal of 
Crustacean Biology 9 (1): 115-125. 
Pennak, R.W. 1989. Fresh-water Invertebrates of the United 
States. Protozoa to Mollusca, 3rd ed., pp. 362-365. New 
York, John Wiley and Sons, Inc. 


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First Record from Nebraska of the Clam Shrimp \u3ci\u3eEulimnadia diversa\u3c/i\u3e (Crustacea: Branchiopoda: Conchostraca)

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