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Aquatic Insects: Hemimetabola – Collembola and Ephemeroptera

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Aquatic Insects: Hemimetabola – Collembola and Ephemeroptera Glime, J. M. 2017. Aquatic Insects: Hemimetabola – Collembola and Ephemeroptera. Chapt. 11-4. In: Glime, J. M. 11-4-1 Bryophyte Ecology. Volume 2. Bryological Interaction. Ebook sponsored by Michigan Technological University and the International Association of Bryologists. Last updated 21 April 2017 and available at <http://digitalcommons.mtu.edu/bryophyte-ecology2/>. CHAPTER 11-4 AQUATIC INSECTS: HEMIMETABOLA – COLLEMBOLA AND EPHEMEROPTERA TABLE OF CONTENTS COLLEMBOLA....................................................................................................................................................... 11-4-2 Isotomidae......................................................................................................................................................... 11-4-6 Bog Springtails.................................................................................................................................................. 11-4-6 HEMIMETABOLA ................................................................................................................................................. 11-4-9 EPHEMEROPTERA – Mayflies.............................................................................................................................. 11-4-9 Suborder Furcatergalia.................................................................................................................................... 11-4-12 Leptophlebiidae – Prong-gilled Mayflies................................................................................................. 11-4-12 Caenidae – Small Squaregill Mayflies..................................................................................................... 11-4-13 Neoephemeridae...................................................................................................................................... 11-4-13 Ephemerellidae – Spiny Crawlers............................................................................................................ 11-4-14 Seasons............................................................................................................................................. 11-4-17 Food.................................................................................................................................................. 11-4-18 Ephemerella...................................................................................................................................... 11-4-19 Serratella .......................................................................................................................................... 11-4-20 Teloganopsis ..................................................................................................................................... 11-4-22 Cincticostella .................................................................................................................................... 11-4-22 Drunella............................................................................................................................................ 11-4-23 Caudatella......................................................................................................................................... 11-4-24 Attenella............................................................................................................................................ 11-4-24 Torleya.............................................................................................................................................. 11-4-24 Leptohyphidae – Little Stout Crawler Mayflies....................................................................................... 11-4-24 Suborder Pisciforma........................................................................................................................................ 11-4-25 Ameletidae – Combmouthed Minnow Mayflies...................................................................................... 11-4-25 Baetidae – Blue-winged Olives................................................................................................................ 11-4-25 Siphlonuridae – Primitive Minnow Mayfly............................................................................................. 11-4-28 Heptageniidae – Clinger Mayflies........................................................................................................... 11-4-28 Isonychiidae............................................................................................................................................. 11-4-29 Oligoneuriidae – Brushleg Mayflies........................................................................................................ 11-4-29 Suborder Carapacea ........................................................................................................................................ 11-4-29 Baetiscidae – Armored Mayflies.............................................................................................................. 11-4-29 Summary ......................................................................................................................................................... 11-4-30 Acknowledgments........................................................................................................................................... 11-4-30 Literature Cited ............................................................................................................................................... 11-4-30 11-4-2 Chapter 11-4: Aquatic Insects: Hemimetabola – Collembola and Ephemeroptera CHAPTER 11-4 AQUATIC INSECTS: HEMIMETABOLA – COLLEMBOLA AND EPHEMEROPTERA Figure 1. Serratella ignita, a common moss dweller. Photo by J. C. Schou, with permission. COLLEMBOLA – Springtails This group was traditionally considered to be one of water surface. Some can be seen bouncing around on the the insect orders, but more recently they have been snow in winter. classified in the class Entognatha. Collembola are quite small and lack wings. They have three pairs of legs, like insects, but have only six abdominal segments (Thorp & Covich 1991). The young (nymphs) resemble the adults, changing to adults by breaking their outer covering (exoskeleton) and discarding it, then expanding while the new exoskeleton is still soft.. They are unique in having a furcula (Figure 3-Figure 5) that forms the spring and a collophore (cylindrical ventral tube; Figure 3, Figure 6). When at rest, the furcula bends forward under the abdomen and is held in place by the tenaculum (Figure 3), a midventral structure that clasps the furcula. The springtail accomplishes rapid distance movement by releasing the furcula, which springs backward, propelling the springtail Figure 2. Podura aquatica moulting; note split in outer forward several centimeters. This can be used even on the skeleton. Photo by Jan van Duinen, with permission. Chapter 11-4: Aquatic Insects: Hemimetabola – Collembola and Ephemeroptera 11-4-3 the springtail. It is these bacteria that control the parthenogenesis in the colonized species. That is, they feminize the springtails. Figure 3. Collembola external anatomy. Modified from Cooperative Extension illustration, University of Missouri. Figure 6. Isotoma (springtail) showing collophore (arrow). Photo by U. Burkhardt, through Creative Commons. Figure 4. Arthropleona oruarangi showing furcula. Photo by Stephen Moore, Landcare Research, NZ, with permission. Figure 7. Collembola eggs. Photo by Jan van Duinen, with permission. Figure 5. Dicyrtomina ornata ventral side showing furcula. Photo by Jan van Duinen, with permission. Collembola can be sexual or parthenogenetic. Sexual males deposit spermatophores in clusters or individually. Females stimulate this deposition by producing pheromones (Waldorf 1974). But among many of the soil Collembola, presumably including bryophyte dwellers, females lay eggs (Figure 7-Figure 8) that have not been fertilized, i.e., are produed parthenogenetically. Since few reproductive studies exist, I cannot generalize of aquatic bryophyte dwellers. What makes this reproduction so interesting is the role of symbiotic bacteria in the genus Wolbachia (Werren et al. 1995). These bacteria live in and Figure 8. Sminthurides eggs in duckweed. Photo by Jan reproduce in the female reproductive organs and eggs of van Duinen, with permission. 11-4-4 Chapter 11-4: Aquatic Insects: Hemimetabola – Collembola and Ephemeroptera The Collembola are predominately moist terrestrial collections using insect nets. Others may have "sprung" organisms, but some can hop on the water surface (Figure away from surface locations as the collector approached. 9) or live among wet mosses. Waltz and McCafferty (1979) considered only 10 species as semiaquatic and five as riparian (relating to bank of river or other moving water). The waxy cuticle (Chang 1966), coupled with small size, permits them to float on water. The collophore (ventral tube) serves a double function: absorption of water and respiration. The Collembola seem to be particularly responsive to drawdown and drainage (Silvan et al. 2000). On older drained sites their numbers were up to 100 times as high compared to pre-drawdown. Other invertebrates were typically about ten times as high. The Collembola occurred mostly in the top 4 cm of the drained land. Figure 10. Odontella cf. incerta; O. lamellifera is a springtail that occasionally occurs among stream bryophytes in the Appalachian
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