Leptoceridae

Las larvas de Leptoceridae poseen densos pelos natatorios y largas patas traseras que sobresalen de su capullo, lo que les permite nadar eficazmente. La natación les permite desplazarse rápidamente entre la vegetación acuática en busca de alimento o refugio. Las larvas de una especie de leptocérido, Triaenodes tardus , pueden nadar continuamente hasta seis minutos. ^{[ 3 ]}

Las larvas de leptocéridos presentan una amplia tolerancia a la calidad del agua y se alimentan de una gran variedad de alimentos, desde detritos y algas hasta la depredación de esponjas de agua dulce . ^{[ 4 ]} Los grupos tróficos incluyen raspadores, trituradores y depredadores. ^{[ 2 ]} Habitan estanques, marismas, lagos y las corrientes más lentas de los arroyos, especialmente donde se encuentran plantas acuáticas . El hábitat específico , la calidad del agua y los requerimientos dietéticos difieren entre especies.

Antennae are long (except Ceraclea), with males and females generally having antennae 2x and 1.5x the forewing length, respectively. Adults always have apical spurs, but no preapical spurs on the middle and hind tibia, and 0, 1, or 2 spurs on the front. Maxillary palps are long and five-segmented in both sexes. The wings are long and slender. The front- and hindwings are mechanically joined together by an arrangement of hairs.^[2]

Leptoceridae are unique among Trichoptera in having their fore- and hindwings highly synchronized during flight, which allow them to perform more acrobatic flights than other caddisflies.^[5] Male leptocerids form dense swarms over waterbodies to court females. Males can vary in body size and flight capability, which likely influences their reproductive success.^[6]

Leptoceridae perform three types of swarming flight patterns and pair formation behaviors. Male Athripsodes and Ceraclea fly in horizontal zigzag patterns over the surface of the water. Females fly into these swarms and are grabbed by the males midair, couple their genitalia, and continue flying while mating or carry their partner to nearby vegetation to finish copulating. Only the male use its wings; the female hangs upside-down from the coupling. Similarly, male Mystacides fly in vertical zigzag patterns over water and vegetation and grab approaching females. However, both partners use their wings to fly in tandem and do not couple their genitalia midair. They fly together to the shore to copulate. Male Triaenodes fly in a mixture of both horizontal and vertical zigzagging, where they search for females perched on aquatic plants. When a female is found, the male lands next to it and copulates while clinging to the plant for a long time.^[6]

These differences in flight patterns and pair formation behaviors correlate with three types of sexual dimorphism. Males of species that fly while copulating have longer forewings than their female partners. Males of the vertically zigzagging species have larger eyes, enabling them to more easily detect females that approach the swarm. Males of species that do not fly while copulating are much smaller than their female partners.^[6]

La mayoría de las hembras de leptocéridos depositan sus huevos como una masa gelatinosa verde en la superficie del agua, aunque Nectopsyche los deposita como filamentos. Los huevos flotan en la superficie hasta que se hinchan con el agua y se hunden. ^{[ 7 ] [ 2 ]}