Life History and Secondary Production of Caenis latipennis Banks (Ephemeroptera: Caenidae) in Honey Creek, Oklahoma Page: 15
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Legs (Figure 4c) lack distinction between tarsal segment and tibia. However examination
of later instar nymphs showed a separation at the base of the second large spine or the 1st
tibia spine. Tarsus and tibia each have a stout spine on inner margin and two setae on
outer margin. The fibia have two setae present. Tarsal claws are sharply pointed with a
cluster of spines in apex of curve of claw. Abdominal segments have 1-2 lateral setae
and a row of spinules. Three five segmented cerci are present. A cluster of three or four
spines is present on the apical end of segments 1-3. Two lateral setae are present at the
apical end of segments 2, 4, and 5.
Development class I is represented by first instar nymphs (Figure 4) with no wingpads
present. Development classes II through V are represented in Figure 5 and are as
follows: II = clear wingpads present in thoracic region, III = wingpads with veins present
in thoracic region, IV = wingpads with veins present in abdominal region or with veins
and mottling present in thoracic region, V wing pads enlarged, with veins and dark
mottling reaching abdominal region. Nymphs of the final development class were sexes
based on caudal filament morphology. Male caudal filaments lacked distinct bands
proximal to abdomen and were enlarged at bases while female caudal filaments displayed
distinct banding the entire length of filaments and were not enlarged basally (Figure 6).
This was confirmed by the presence of ova in nymphs displaying the second set of
characteristics. The male to female sex ratio of 583 nymphs examined was 1.09 : 1.
Laboratory Rearing
Eggs collected in the field and brought back to the laboratory were incubated under
three different temperature regimes. Egg broods incubated at 14 - 15oC first hatched on
day 28 (n=3). Eclosion for egg broods occurred in 12 to 14 days at 19 - 21oC (n=6). At15
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Taylor, Jason M. Life History and Secondary Production of Caenis latipennis Banks (Ephemeroptera: Caenidae) in Honey Creek, Oklahoma, thesis, August 2001; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc2863/m1/22/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .