Aquatic Insects of Michigan by Ethan Bright, Museum of Zoology Insect Division and School of Natural Resources and Environment |
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Leptoceridae of Michigan - Identification[under contruction]: Only a larval key is present; a key to the adults is in preparation Larvae 1. Hind tibiae each appearing to be divided into two equal parts - 2 2(1). Sclerotized concave plate on each side of anal opening; case cylindrical,
constructed of small stones - Setodes 3(2'). Hind legs without a fringe of swimming hairs; mandibles only slightly
assymmetric; case not spirally arranged - Mystacides 4(3'). In dorsal view, head mostly with light brown pigmentation, ending before
the occipital foramen; only a small amount of cream ground color visible as
a thin smooth crescent between the anterior head pigmentation and occipital
foramen - Ylodes 5(1'). Middle legs each with a hook-shaped tarsal claw; tarsus curved; case
transparent, constructed entirely of silky salivary secretions - Leptocerus 6(5'). Maxillary palpi extremely long, extending beyond labrum; mandibles
blade-like with a sharp apical tooth - Oecetis 7(6'). Mesonotum with a pair of dark curved bars; abdomen short, tapering
posteriorly from broad base; gills with several filaments; case short and robust,
constructed of various materials; some species found on freshwater sponges
- Ceraclea Nectopsyche (larvae, modified from Glover and Floyd, 1996) 1. Two setae present on the metasternum; tracheal gill absent from posterolateral
corner of metanotum; also: head with
a pattern of dark pigmentaion; case dorsoventrally compressed, and composed
of overlapping leaf segments - Nectopsyche pavida (Hagen) 2(1'). Dorsum of head and thorax
lacking longitudinal black stripes; also: metasternum with less than 15 setae
(usually 8-10); head pattern variable but
usually appearing reticulate, without well-defined muscle scars; legs either
darkly pigmented or with dark pigmentation at joints - Nectopsyche
exquisita (Walker) 3(2). Metathoracic legs with well-developed
swimming hairs; head and pronotum with parallel, longitudinal, black stripes
- Nectopsyche diarina (Ross) Oecetis (larvae, modified from Floyd 1995; larvae of O. ditissa undescribed ) 1. Dorsal hump of Ab1 with 4-6 rows of micro-hooks on each side - 2 2(1). Head either yellow, with dark muscle scares or paler yellow, with indistinct
muscle scars; ventral apotome approximately 4x wider than long; lotic
- Oecetis avara 3(1'). Postgenal sclerites separated by distinctive brown and pale areas;
lateral hump of Ab1 sometimes with a dark, elongate sclerite; also: ventral
apotome subrectangular, 4x wider than long, with small posterolateral, triangular
sclerites; lateral sclerite of Ab1 light yellow, with 2 ventral setae; metasternum
with 2 setae; lotic - Oecetis eddlestoni Ross 4(3'). Metasternum with 2 setae; swimming hairs present on hind tibiae; hind
tarsi longer than trasal claws; case constructed of root or plant fragments
placed transversely - 5 5(4). Head brown with light muscle scars; case constructed either of short
twigs or roots (angled "log cabin" appearance), or thin, flat, quadrate, plant
fragments; principally lentic, slow-moving lotic waters, on vegetation - Oecetis
cinerascens (Hagen) 6(4'). Mesosternum with a pair of irregular dark areas on each side of meson;
coronal suture bordered by a row of 3-4 dark muscle scars on each side; left
mandible blunt with deep crease running from apical tooth; case constructed
of sand grains - Oecetis osteni Milne 7(6'). Dorsum of head with large, dark spot present on each postgenal parietal
between eye and frontoclypeal suture, with an additional spot present at the
posterior end of the frontoclypeus - 8 8(7). Metasternum with a row of 50-90 setae; ventral apotome trapezoidal,
roughly 2x wide as long; coxae of legs with 2-4 muscle scars; tergite of Ab9
with 26-30 setae; mostly lentic - Oecetis ochracea (Curtis) 9(7'). Head and pronotum usually with several light brown muscle scars; case
constructed of sand, or rock pieces, with larger ballast stones attached to
the sides; lotic and lentic - Oecetis nocturna Ross References
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