Ilybius discedens Sharp
publication ID |
https://doi.org/ 10.1649/0010-065x(2000)054[0036:darolo]2.0.co;2 |
persistent identifier |
https://treatment.plazi.org/id/03C087C3-D858-933F-FDA6-FB23FDEFFBB5 |
treatment provided by |
Carolina |
scientific name |
Ilybius discedens Sharp |
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Ilybius discedens Sharp View in CoL
Instar I. Colour. Head brown with light brown areas; antennae grey with the terminal segment pale. Thorax, abdomen and urogomphi brown to grey. Sterna and legs pale yellow. Head ( Fig. 1B View Fig ). HL 5 0.95 mm, HW 5 0.89 mm. Head widened slightly at eyes. Legs ( Fig 4 View Fig ). Femora with or without ventral spinulae, if present not numerous and located between AV setae; femur with one proximal seta in PV series. Abdomen ( Fig. 2B View Fig ). LAS 0.60 times UT. Siphon long, SI/LAS 5 0.42. Urogomphus with U4 pale and spiniform, U3 and U2 darker and setiform, length of U4/length of U3 5 0.16. Abdomen with terga 1–6 each with two short, pale submedial setiform setae; lateral setae short; segment 7 with two dorsal and two ventral submedial setae and two darker, more elongate lateral setae, these setae much shorter than those of I. biguttulus or I. pleuriticus ; other smaller setae present but not prominent.
Instar III. Colour ( Fig. 6B View Fig ). Head brown with light brown areas; appendages lightbrown. Thorax and abdomen brown to grey with pale areas laterally except last three segments of abdomen without pale areas. Sterna light grey. Urogomphus brown. Legs lightbrown. Head ( Fig. 7B View Fig ). HL 5 1.73 mm, HW 5 1.53 mm. Sides of head parallel. Legs ( Fig. 9 View Fig ). Femora with secondary dorsal spines as follows: profemur four to six, mesofemur four to five, metafemur five to seven; pro and mesofemora with spinulae in the AV series but number and size of spinulae very reduced; metafemur without spinulae in AV series. Abdomen ( Fig. 11B View Fig ). Dorsal surface with relatively few spiniform setae. Primary setae of abdominal segments small and pale. LAS/UT 5 0.86.
Ecology. Adults and larvae of I. discedens where collected in small Sphagnum bog pools where the water level remained constant. Instar I larvae hatched from eggs of field collected females in early and middle September. The incubation time for eggs reared in the lab at 23 8 C 6 1 8 was 13.3 6 1.2 days (n 5 37), similar to that reported by Hicks and Larson (1995). The collection records and hatch dates support the life history proposed by Hicks and Larson (1995) for this species.
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