2009年5月7日 · stemma noun, plural stemmata - the simple eye of a certain larval insects, also called lateral ocelli, though they are not homologous with ocelli. They are found on the heads of the larvae of most holometabolus insects. Structurally, they resemble individual elements of the compound eye more than ocelli, and indeed, are found on the area of the head where …

Lateral Ocelli. Lateral ocelli (=stemmata) are the sole visual organs of holometabolous larvae and certain adults (e.g. Collembola, Zygentoma, Siphonaptera, and Strepsiptera). Stemmata always occur laterally on the head, and vary in number from one to six on each side. Structurally, they are similar to dorsal ocelli but often have a crystalline cone under the cornea and fewer sensory rods.

2009年1月1日 · Stemmata are innervated laterally from the optic lobes, and typically there is a group on each side of the head. The number of stemmata is variable, ranging from zero to seven, and the number and arrangement can be diagnostic. They are most highly developed in externally feeding larvae such as caterpillars, sawfly larvae, and predaceous larvae ...

2014年8月15日 · Stemmata, the eyes of holometabolous insect larvae, have gained little attention, even though they exhibit remarkably different optical solutions, ranging from compound eyes with upright images, to sophisticated single-chamber eyes with inverted images. Such optical differences raise the question of how major transitions may have occurred. Stemmata evolved …

In the pupal stage, such stemmata develop into fully fledged compound eyes. One feature offering a clue to their ontogenetic role is their lateral position on the head; ocelli, that in other ways resemble stemmata, tend to be borne in sites median to the compound eyes, or nearly so. Among some researchers, this distinction has led to the use of ...

2003年11月28日 · have seven stemmata (67a), but most larvae have six stemmata of approx- imately equal size arranged in a loose circle above and lateral to the antennal base, though the number is often reduced in ...

2009年1月1日 · The second group of simple eyes, formerly termed “lateral ocelli” but now termed “stemmata” (singular stemma), is found in the larvae of Holometabola. Stemmata are innervated laterally from the optic lobes, and typically there is a group on each side of the head. The number of stemmata is variable, ranging from zero to seven, and the ...

Stemma (plural stemmata) may refer to: In stemmatics, an approach to textual criticism, a stemma or stemma codicum is a diagram showing the relationships of the various versions of a text to earlier versions or manuscripts; Tree-like diagrams representing sentence structure and syntax created by Lucien Tesnière;

Larvae have stemmata and adults have compound eyes. Adults use compound eyes to mediate photic communication during courtship. Larvae do not manifest this behavior, yet they are bioluminescent. We investigated the structure of stemmata in Photuris firefly larvae to identify anatomical substrates (i.e., rhabdomeres) conferring visual function ...

2024年11月26日 · In holometabolous insects, investigations of the visual capabilities of larvae mediated by stemmata have been overshadowed by research on the amazing visual powers that adults achieve. The second group of simple eyes, formerly termed “lateral ocelli” but now termed “stemmata” (singular stemma), is found in the larvae of Holometabola.