LANCEIMERMIS-MINNESOTENSIS N-SP AND GASTROMERMIS-PARVISPICULARIS N-SP(NEMATODA, MERMITHIDAE) FROM ADULT CHIRONOMIDS EMERGING FROM LAKE ITASCA, MINNESOTA, USA
Aa. Johnson et Mg. Kleve, LANCEIMERMIS-MINNESOTENSIS N-SP AND GASTROMERMIS-PARVISPICULARIS N-SP(NEMATODA, MERMITHIDAE) FROM ADULT CHIRONOMIDS EMERGING FROM LAKE ITASCA, MINNESOTA, USA, Transactions of the American Microscopical Society, 113(2), 1994, pp. 177-189
Lanceimermis minnesotensis n. sp. and Gastromermis parvispicularts n.
sp. are described from adult chironomids emerging from Lake Itasca, Mi
nnesota in June 1992. L. minnesotensis n. sp. is distinct from other m
embers of the genus in the presence of a subventral mouth, location of
the amphidal opening immediately posterior to the level of the cephal
ic papillae, presence of an excretory pore, presence of a dorsal commi
ssure, and in the presence of supporting ligaments between the amphids
and the anterior esophagus. Additionally, the terminal denticles on t
he non-ornamented spicule and the organization of the copulatory muscl
es serve to readily separate the males. A new combination L. canadensi
s is introduced. G. parvispicularis n. sp. is separated from other mem
bers of the genus by body length, esophagus length as a percentage of
body length, six hypodermal cords, long buccal funnel, amphidal openin
gs at the level of the cephalic papillae, suspensory ligaments between
the anterior esophagus and the amphids, presence of a dorsal commissu
re, absence of an excretory pore, small size of the spicule, and short
terminal limbs of the vagina. The practice of using only one sex or s
mall numbers of specimens for species descriptions is discouraged.