Preliminary Studies on the Hydracarina of Michigan: The Genus Limnesia, subgenera Limnesiopsis Piersig and Limnesiella Daday

Psyche: A Journal of Entomology, Apr 2019

David R. Cook

A PDF file should load here. If you do not see its contents the file may be temporarily unavailable at the journal website or you do not have a PDF plug-in installed and enabled in your browser.

Alternatively, you can download the file locally and open with any standalone PDF reader:

http://downloads.hindawi.com/journals/psyche/1954/095982.pdf

Preliminary Studies on the Hydracarina of Michigan: The Genus Limnesia, subgenera Limnesiopsis Piersig and Limnesiella Daday

International Journal of PRELIMINARY STUDIES ON THE HYDRACARINA OF MICHIGAN: THE GENUS LIMNESIA, SUBGENERA LIMNESIOPSIS PIERSIG AND LIMNESIELLA DADAY BY DAVID R. COOK Department of Biology, Wayne University BY DAVID R. COOK 0 1 0 Department of Biology, Wayne University 1 Contribution from the University of Michigan Biological Station , USA The genus. Limnesia is represented in Michigan by members of four subgenera" Limnesia s.s., Teralimnesia, Limnesiopsis and Limnesiella. Only the latter two subgenera will be treated in this paper. Both Limnesiopsis and Limnesiella ha.ve at times been considered to be distinct genera. However, most workers now look upon them as merely polyacetabulate members of the genus Limnesia. There has been some confusion between Limnesia (Limnesiopsis) anomala and Limnesia (Limnesiella) marshallae, the only previously described species belonging to these subgenera known from North America. It is hoped that a redescription of these two species will clear up this situation. In add'ition, a new Limnesiella is described from Michigan. Cook---Hydra.carina of Michigan Male: Length of body 1.3-1.5 mm; length of genital field 0.43-0.46 mm; width .of genital field 0.49-0.54 mm. Body rounded, integument soft; a pair o.f small sclerites present near posterior end of .dorsum, these plates approximately 0.07 mm in length aceta.bular plates broadly joined at both ends, length of genital opening less than one-half length of genital field; genital acetabula numerous (55-65 on each side), two pairs o.f acetabula, considerably larger than the others; apodemes of posterior border of third coxae complete. Palps large and powerful; the dorsal lengths of the palpal segments, in millimeters, varied as follows" P-I, 0.0310.040 mm; P-II, 0.224-0.240 mm; P-III, 0.184-0.204 mm; P-IV, 0.392-0.406 mm; P-V, 0.092-0.095 mm; peg on ventral si.de of P-II located on a slightly raised tubercle, peg projecting directly outwards (Fig. 7); swimming hairs present on third and fourth pairs of legs; claws with minor clawlets present posterior to. the major clawlets. Female: Length of body 1.4-1.6 mm; length of genital field 0.35-0.37 mm; wi.dth o,f genital field 0.33-0.38 mm; width of pregen?i,al sclerite 0.21-0.23 mm. Body, legs. and palps similar to those of male except that they average slightly larger; 58-67 genital acetabula on each side; acetabular plates not uni,ted as in male, but able to open an,d close over the genital valves; posterior portion o genital field only slightly wider than anterior portion. Habitat" Most ,commonly taken in lakes but the author ha,s one record from a permanent pond. Although this species is an ex.cellent swimmer, it is. often found crawling about in crack,s and crevices of submerged logs. Range: Marshall (1932 ) lists this species from New York, Wisconsin and Michigan. Limnesia (Limnesiopsis) anomala has been taken in only eleven Michigan counties. However, these are widely scattered and it is likely that this species occurs, throughout the state. Subgenus Limnesiella Daday Limnesiella Daday, 1905. Zool,og?ica, 44:306. Neolimnesia Lun.dblad, 1936. Zo.ol. Anz., 116:202. Subgeneric diagnosis: Genital acetabul numerous; claws [December without minor clawlets posterior to. the major clawlets; small setae-bearing tubercles present on ventral side of fourth palpal segment. Limnesia (Limnesiella) marshallae (Viets) Figs. 3, 6, 8 Limnesiopsis anomala Marshall (in part), 1932 . Trans. Wisconsin Acad. Sci., 27"346. Limnesiopsis anomala marshallae Viets, 1938 . Zool. Anz. 121:134. Limnesia hutchinsoni Lundblad, 1941. Ibid., 133"158. (no.n) Limnesia marshallae Lundblad, 1941. Ibid., 133:157. Limnesia marshallae Lundblad, 1952. Arkiv fSr Zool. (Ser. 2), 3:525. Male: Length of body 1.15-1.72 mm; length of genital field 0.27-0.35 mm; width of genital field 0.30-0..37 mm. Body rounded, integument sof; a single, median scle rite, approximately 0.087-0.120 mm in diameter, present near posterior edge of dorsum; acetabular plates united t both ends, genital opening much greater than one-half total length of genital field; outer margin of acetabular plates concave; 22-27 genital acetabula present on each side, these roughly grouped into two. circles of small acetabula surrounding the two pairs of larger acetabula; apodemes of posterior border of the third coxae incomplete, ending near setigerous gland of fourth coxae. Palpi swollen at distal end of second segment, peg directed posteriorly, similar to that found in Limesia maculata (Miiller) dorsal lengths of the palpal segments were: P-I, 0.035-0.041 mm; P-II, 0.192-0.216 mm; P-III, 0.1320.152 mm; P-IV, 0.282-0.335 mm; P-V, 0.059-0.074 mm; swimming hairs present on third and fourth pairs of legs; claws with only two major clawlets. Female: Length of body 1.72-2.13 mm; length of genital field 0.28-0.36 mm; width of genital field 0.23-0.31 mm;. width of pregenital sclerite 0.21-0.23 mm; female similar to male except in size and structure of the genital field; acetabular plates not united, 22-23 acetabula on each side, these grouped as in male. Habitat" Usually found in lakes, often in rather deep, Cook--Hydracarina of Michigan water. This species has also been taken in bogs and permanent ponds. Range" Known only 2ro.m Wisconsin and Michigan. Limnesia marshallae has been collected in eight Michigan ,counties, but as in Limnesia anomala, these are. widely scattered and it probably is statewide in occurance. Remarks" Limnesi marshallae was originally described from a drawing by Ruth Marshall of the geni,tal field of he male. Marshall (1932 ) included drawings of the ventral view of a female,, genital field of a male and provisional genital field of a. nymph, all labeled Limnesiopsis anomala. Viets (1938 ) recognized that the male was distinct and set it up as the. variety Limnesiopsis an.oma.la, ma.rshallae. Since none o.f the subgeneric characters were. illustrated, Viers could not know that it was really a Limnesiella instead of a Limnesiopsis. Lundblad (1941) described a female from Wisconsin as Limnesia (Limnesiella) hutchinsoni. The present a,uthor sent a female specimen of Limnesia marshallae (Viers) to Lundblad and he found it to be identical with his L. hutchinsoni. The latter name therefore becomes a synonym. In the same paper Lundblad also described a new species of Limnesia s.s. under the name of Limnesia marshallae. This name is therefore a homonym and Lundblad (1952) has renamed the species L. marshalliana. One of the male specimens of L. marshallae (Viers) from Marshall?s collection, now in the Chicago Natural History Museum, should be designated as lectotype. Limnesia (Limnesiella) eggle.toni n. sp. Figs. 4, 5, 9, 10, 11 Male: Length of body 0.88-1.08 mm; length of genital field 0.25-0.28 mm; width of genital field 0.26-0.31 mm. Body rounded, integument soft; sclerites absent from posterior end of dorsum; acetabular plates united, outer margin convex; 14-18 genital acetabula present on each side, these grouped i,nto anterior and posterior sets with a wide area free of acetabula between; posterior acetabular group arranged in the form of a hook about the. large acetabula; apodemes of posteri.or border of third coxae complete; setigerous gla.nd of fourth coxae located about two-fifChs distance between posterior ends .of third and fourth coxae. Palp swollen near distal end ,of second segment, peg directed outwards; setae present on f.ourth segment but. these not on well developed tubercles; dorsal lengths, in millimeters, o.f the palpal ,segments varied as follows" P-I, 0.036-0.041 mm; P-II, 0.116-0.128 mm; P-III, 0.095-0.108 mm; P-IV, 0.160-0.169 mm; P-V, 0.047-0.052 mm; swimming h?irs present on third and fourth pairs of legs; claws with two major clawlets. Female: Length of body 1.27-1.39 mm; length of genital field 0.24-0.30 mm; width of genital field 0.19-0.23 mm; width of pregenital sclerite 0.16-0.17 mm. Female similar to. male except in size, structure o the genital field and in having the setigerous glands of .the fourth coxae much closer to. the third .coxae than in the male; acetabular p,late.s not united, with 12-18 genital acetabula on each side, these arranged as in male; palpal segments averaging slightly larger than in male. Nymph: Length of fully grown nymph approximately 0.55-0.59 mm.; length of provisional genital field 0.0850.091 mm; width o.f provisional genital fiel.d 0.123-0.128 1Tim. Provisional genital field with only two pairs o.f acetabula, apodemes forming a cross (Fig. 10); three pairs of setae p;resent on provisional genital field; palps resembling those EXPLANATION OF PLATE 11 COOK HYDRACARINA [Dece.mber of .adults except that the peg is absent and the distal end of the second segment is not as swollen; dorsal lengths of the palpal segments were: P-I, 0.019-0.024 mm; P-II, 0.0670.078 mm; P-III, 0.058-0.064 mm; P-IV, 0.106-0.114 mm; I)-V, 0.035-0.038 mm. Holotype" Adul.t male, taken in Nichols? Bog, Cheboygan County, Michigan (T86N/R3W/S2) on July 24, 1952. Allotype: Adult emale, same date and locality a.s holotype. Pa,ratypes: 32 males, 33 females, 14 nymphs, same date and locality as ho.lotype; 9 males, 11 emales, 6 nymphs, same locality on July 13, 1952; 6 maples, 10 females, collected in a temporary po.nd near Big Star Lake, Lake County, Michigan (T17N/R14W/S25) on April 30, 1952; one male, found in Whitmarsh Lake, Chippewa County, Michigan (T45N/R5W/S6) on July 29, 1949. Habitat" Usually taken in tempor.ary and semipermanent ponds and bogs. However, they are occasionally 2ound in small lake.s. Range" At present this species is known only 2rom the northern half .of the lower peninsula and the eastern half of the upper pe.nin,sula o.f Michigan. Remarks" Limnesia eggletoni most closely resembles the South American species L. ma.lacoderma Lundblad. However, the new species may be separated 2rom the latter by the position of the setigerous glands of the fourth coxae and by the act that the nymphs have only two. pairs o genital acetabula. The nymphs of L. malacoderma (and all of the known Limnesiella nymphs from South America) are polyacetabulate. The holotype and allotyp.e will be placed in the Chicago Natural History Museum, paratypes will be deposited in the United States National Museum. IEFERENCES DADAY, E. YON 1905. Untersuchungen uber die Susswasser-Mikrofauna Paraguays. Zoologica, 44:272-326. KOENIKE, ?. 1895. Nordamerikanische Hydrachniden. Abh. naturw. Ver. Bremen, 13 167-226. Cook--Hydra.carina of Michigan PIERSIG, P. 1897. Peptides Advance s in Hindawi Publishing Corporation ht p:/ www.hindawi.com Submit your manuscr ipts BioMed Hindawi Publishing Corporation ht p:/ www.hindawi.com Stem Cells International Hindawi Publishing Corporation ht p:/ www.hindawi.com Zoology International Journal of Journal of Signal Hindawi Publishing Corporation ht p:/ www.hindawi.com Transduction Genetics Research International Hindawi Publishing Corporation ht p:/ www.hindawi.com Anatomy Research International Microbiology Biochemistry Research International Advances in Bioinformatics Hindawi Publishing Corporation ht p:/ www.hindawi.com Hindawi Publishing Corporation ht p:/ www.hindawi.com Enzyme International Journal of International Journal of Genomics Hindawi Publishing Corporation ht p:/ www.hindawi.com Journal of Nucleic Acids The Scientiifc World Journal 1936. Dritte Mitteilung uber Wassermilben aus Santa Catharina in Sudbrasilien . Zool. Anz., 116 : 200 - 211 . 1941 . Neue Wassermilben aus Amerika, Afrika, Asien und Australie . Ibid., 133 : 155 - 160 . 1952. Hydracarinen yon den ostafrikanischen Gebirgen . Arkiv fSr Zool. (Ser. 2) , 3 : 391 - 525 . MARSHALL , R. 1932 . Preliminary list of the Hydracrin of Wisconsin: Part II . Trans. Wisconsin Acad. Sci. , 27 : 339 - 358 . Beitrge zur Kenntnis der in Sachsen einheimischen Hydrachniden-Formen . Sitzungsb. Naturf. Ges. Leipzig, 22 /23: 33 - 103 . VIETS , KARL. 1938 . Uber Hydrachnellae aus Uruguay, Zool . Anz., 121 : 131 - 136 .


This is a preview of a remote PDF: http://downloads.hindawi.com/journals/psyche/1954/095982.pdf

David R. Cook. Preliminary Studies on the Hydracarina of Michigan: The Genus Limnesia, subgenera Limnesiopsis Piersig and Limnesiella Daday, Psyche: A Journal of Entomology, DOI: 10.1155/1954/95982