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Phyllopods of Missouri Proceedings of the Iowa Academy of Science Volume 78 Number 3-4 Article 12 1972 Phyllopods of Missouri C. Thomas Wiltshire Donald H. Hazelwood Let us know how access to this document benefits ouy Copyright ©1972 Iowa Academy of Science, Inc. Follow this and additional works at: https://scholarworks.uni.edu/pias Recommended Citation Wiltshire, C. Thomas and Hazelwood, Donald H. (1972) "Phyllopods of Missouri," Proceedings of the Iowa Academy of Science, 78(3-4), 70-72. Available at: https://scholarworks.uni.edu/pias/vol78/iss3/12 This Research is brought to you for free and open access by the Iowa Academy of Science at UNI ScholarWorks. It has been accepted for inclusion in Proceedings of the Iowa Academy of Science by an authorized editor of UNI ScholarWorks. For more information, please contact [email protected]. Wiltshire and Hazelwood: Phyllopods of Missouri 70 PROC. lowA AcAD. Sci. 78 ( 1971-1972) Phyllopods of Missouri C. THOMAS WILTSHIRE and DONALD H. HAZELWOOD C. THOMAS WILTSHIRE and DONALD H. HAZELWOOD. Eulimnadia texana, Cyzicus morsei, Caenestheriella belfragei, and Phyllopods of Missouri. Proc. Iowa Acad. Sci., 78(3-4):70-72, Caenestheriella gynecia. 1972. INDEX DESCRIPTORS: Phyllopods, Missouri, Eubranchippus serratus, SYNOPSIS. Collections .of phyllopods from Missouri have been Thamnocephalus platyurus, Strpetocephalus seali, S. texanus, reviewed and a key to those species has been constructed. Species Eulimnadia texana, Cyzicus morsei, Caenestheriella belfragei, C. collected in Missouri include Eubranchipus serratus, Thamnoceph­ gynecia. alus platyurus, Streptocephalus seali, Streptocephalus texanus, Phyllopods are crustaceans with flat, leaf-like appendages mexicanus, has been included in the key since it is known to which characterize the orders Anostraca (fairy shrimp), Notos­ occur in Illinois, Kansas, Nebraska, and Oklahoma. It is likely traca (tadpole shrimp), and Conchostraca (clam shrim_p), that the distribution of this species includes Missouri. Phyllopods are poor swimmers and make easy prey for fish; Only one species of Eulimnadia is included in the key, but therefore their occurrence is restricted to temporary pools, several collections have yielded members of this genus which roadside ditches, and other lentic habitats unsuitable for main­ have not been identified to species. Perhaps subsequent col­ taining a fish population. The eggs hatch after rains have lections will enable clarification of the taxonomic status of filled their ephemeral habitats, and as the water evaporates, these specimens. The best single source of keys for identifica­ tremendous concentrations of animals are sometimes found. tion of phyllopods not included in ,this key is Edmondson The appearance of phyllopods is somewhat unpredictable, al­ (1959). though with the exception of Eubranchipus serratus, they are ANNOTATIONS generally found in the flood plains of major river systems. The Triops longicaudatus LeConte 1846 is the only species of conditions for success.fol completion of the life cycle may Notostraca which occurs in Missouri. It is found in Boone and only last a week during an entire year, or even several years Howard Counties from June through October, and the water may pass between appearances. As a result of their inaccessi­ is usually quite turbid due to the burrowing habit of these bility, little ecological work has been done, with the study by animals. They can be seen breaking the surface film where Broch ( 1965) on Chirocephalus bundyi a noteworthy excep­ they occur in heavy concentrations. For a complete taxonomic tion. treatment of the group, see Linder ( 1952) . There are published accounts of the phyllopods occurring Eubranchipus serratus Forbes 1874 is the only species of in Illinois (Mattox, 1939), Oklahoma (Mackin, 1939; Pro­ the family Chirocephalidae which occurs in Missouri. It is a phet, 1963), Kansas (Leonard and Ponder, 1949), and Ne­ verna:l species found from February through May. It has been braska (McCarraher, 1970), but no account of the phyllo­ collected in Boone County and probably has a state-wide dis­ pods in Missouri has been published. Collections of phyllo­ tribution. Dexter. and Ferguson ( 1943) discuss the dish·ibu­ pods made by members of the Zoology Department and the tion and life history of this species. Entomology Department at the University of Missouri~Co­ Thamnocephalus platyurus Packard 1879 is the only spe­ lumbia have been reviewed, and it is the purpose of this ac­ cies of the genus which occurs in Missouri. This species oc­ count to record the species collected in Missouri with a key curs in Boone and Howard Counties from May through Oc­ to those species. tober. See Moore (1964) for a complete discussion of Higher taxonomic groupings of the phyllopods are some­ the genus. what unsettled. Pennak ( 1953) included Anostraca, N otos­ Streptocephalus seali Ryder 1879 is one of two members of traca, and Conchostraca as orders under the subclass Branch­ this genus which has been collected in Boone and Howard iopoda, division Eubranchiopoda with the order Cladocera Counties from late May through October. The male S. seali separated into a second division, the Oligobranchiopoda. is easily distinguished from the male Streptocephalus texanus Dexter ( 1959) includes all four orders under the subclass by the form of the cercopods (see Fig. 3, 4). The second an­ Branchiopoda. Waterman and Chace ( 1960) include three tennae of the two species are also different, but this distinc­ orders under the subclass Branchiopoda: Anostraca, Notos­ tion is less easily made. traca, and Diplostraca, with Conchostraca and Cladocera as Streptocephalus texanus Packard 1871 has been collected suborders of the Diplostraca. The arguments for including in Boone and Howard Counties from late May through Oc­ Cladorcera and Conohostraca as suborders of the order Diplo­ tober. S. texanus and S. seali have frequently been collected straca are not overwhelming, so they are considered as sep­ from the same locations. See Moore ( 1966) for a discussion arate orders in this paper. of the species of this genus. The species included in the key have all been collected in Eulimnadia texana Packard 1871 is the only species of the Missouri, but most of the collections have been restricted to genus definitely known from Missouri. It has been collected tbe centra] part of the state. More extensive collections in from June through October in Boone County. For a descrip­ other parts of the state will undoubtedly increase the number tion of the species of Eulimnadia in .North America, see Mat- of species known to occur in Missouri. One species, Cyzicus tox ( 1954). · Published by UNI ScholarWorks, 1971 1 Proceedings of the Iowa Academy of Science, Vol. 78 [1971], No. 3, Art. 12 >PHYLLOPODS OFMISSOURI 71 3 4 2A y 58 6 7 5A 9 8 Fig. 1. Triops longicaudatus (from Packard after Linder). Fig. after Pennak); 5B. Frontal view of antennal appendage (from 2A. Side view of Streptocephalus seali (from Creaser after Dex­ Pearse after Dexter). Fig. 6. Caudal end of'Thamnocephalus platy­ ter); 2B. Second antenna of S. seali. Fig. 3. Cercopods of Strepto­ urus. Fig. 7. Head of Eulimnadia texana showing frontal appen­ cephalus seali. Fig. 4. Cercopods of Streptocephalus texanus. Fig. dage. Fig. 8. Head of male Caenestheriella belfragei. Fig. 9. Head 5A. Lateral view of head of Eubranchipus serratus (from Mattox of male Cyzicus morsei. https://scholarworks.uni.edu/pias/vol78/iss3/12 2 Wiltshire and Hazelwood: Phyllopods of Missouri 72 PRoc. lowA AcAn. Sex. 78 ( 1971-1972) CaenestherieUa belfragei (Packard) 1871 has been col­ 7(6) Shell somewhat compressed laterally; umbo 1/4-1/8 of lected in Boone County and has a spurious occurrence. The distance from front; shell length/thickness ratio less shell morphology is very similar to that of Cyzicus morsei so than2.. 8 only mature males can be used in determining the species. Shell globose with prominent umbo 1/2-1/3 of distance from front: shell legnth/thickness ratio greater than 2 ... g The critical distinction between Caenestheriella belfragei and 8(7) Females only Caenestheriella gynecia Mattox Cyzicus morsei is the shape of the rosb·um of the male (see Males with rostrum approximately forming a goo angle, Fig. 8, 9). Caenestheriella belfragei has been collected in female rostrum acute (Figs 8, 9) Boone County during the summer and early fall. Cyzicus mexicanus (Clause) Caenestheriella gynecia Mattox 1950 is known from Mis­ g ( 7) Male second antenna with 14-15 segments on flagellae, souri from a single collection in Wayne County near Pied­ rostrum of male and female acute ( Fig. 8) mont, Mo. It was collected in April of 1955, and is unique .... Caenestheriella belfragei (Packard) among the Conchostra:ca in that no males are known. The Male second antenna with 15-16 segments on flagellae, only other records of C. gynecia known to us are from Ohb rostrum of male approximately forming a goo angle, female rostrum acute (Fig. g) Cyzicus morsei (Packard) and Alabama. Cyzicus morsei, (Packard) 1871 has been collected in ACKNOWLEDGMENTS Boone County from June through October. The most charac­ teristic feature of the mature specimens is a crowding of This study was conducted while one of us ( CTW) was sup­ growth lines along the lower one-third to one-fourth of the ported by an NDEA Title rv Pre-doctoral Fellowship. Sincere margin of the shell. Some crowding is also found in larger appreciation is expressed to Dr. Wilber R. Enns, Director of the specimens of Caenestheriella belfragei, but not to the extent Missouri Entomology Research Museum, for permission to examine found in the larger Cyzicus morsei. collections deposited there. Cyzicus mexicanus (Claus) 1860 has not been collected in Missouri, but it has been collected in Quincy, Illinois, Nebras­ Literature Cited ka, Oklahoma, and Kansas. Future collections will undoubt­ BROCH, EDMUND S. 1965. Mechanism of adaptation of the fairy edly confirm the presence of this species in Missouri. For a shrimp Chirocephalus bundyi Forbes to the temporary pond.
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