Notostraca


Also found in: Dictionary, Thesaurus, Wikipedia.
Related to Notostraca: Anostraca, tadpole shrimp

Notostraca

[nə′täs·trə·kə]
(invertebrate zoology)
The tadpole shrimps, an order of crustaceans generally referred to the Branchiopoda, having a cylindrical trunk that consists of 25-44 segments, a dorsoventrally flattened dorsal shield, and two narrow, cylindrical cercopods on the telson.

Notostraca

 

a suborder of invertebrates of the order Phyllopoda. Almost the entire body is covered with a broad carapace. A pair of closely placed compound eyes and an unpaired simple eye are grouped in the front of the carapace. There are no fewer than 40 pairs of thoracic phylloid appendages, the first two pairs of which are equipped with long filiform tactile processes. The abdomen consists of many segments and ends in a pair of long filiform processes.

The Notostraca inhabit shallow bodies of fresh water that dry up seasonally. They feed on decaying organic remains, plants, and small animals. The females lay eggs into pouches on the 11th appendages and release the eggs on the bottom. The eggs can withstand high and low temperatures in the course of several years. Males are considerably less common than females.

The subphylum embraces nine genera. In the USSR the most common are Lepidurus apus, which measures as much as 12 mm in length, and Triops cancriformis, which measures as much as 7.5 cm in length. Some species serve as food for fish and swimming birds. Others are pests in rice fields, uprooting seedlings and eating shoots.

The Notostraca are considered very old. They have been in existence since the Triassic.

REFERENCES

Beklemishev, V. N. Osnovy sravnitel’noi anatomii bespozvonochnykh, 3rd éd., vols. 1–2. Moscow, 1964.
Zhizrí zhivotnykh, vol. 2. Moscow, 1968.
Dogel’, V. A. Zoologiia bespozvonochnykh, 6th ed. Moscow, 1975.
References in periodicals archive ?
The comparison between the Lodeve basin bilobates and the various body parts of the Permian Notostraca, in particular, those of the Lepidurus ventral face (in Gand et al.
They specify that in this case, Notostraca leave behind them only a "shapeless exogen depression".
furcosus would correspond to the print of the Notostraca anterior zone joined together with the no 5 and 6 endites, possibly more no 3, of the thoracopod endopodite no 1.
2001) represent a longitudinal activity of Notostraca digging (= Pascichnia).
However, on the other hand, their frequency and abundance mean numerous biotopes with Notostraca in a large playa environment.
Unable to move out of water, it is clear that Notostraca produced traces in a submerged substrate.
It was observed by Bromley and Asgaard (1972) and Gand (1993) for cubichnia and interpreted as a rheotropism of Notostraca as a result of currents.
Although Acripes, Rusophycus, Cruziana were dominant in Notostraca biotas, a few Scoyenia, insect, possible arachnids and some incertae sedis trackways/burrows (cf.
However, from experiments with Notostraca, it is clear that Acripes/Cruziana/Rusophycus were not produced during emergent sofground (b1 phase) but while a and b2 phases.
Acripes, Rusophycus and Cruziana are the three main ichnomorphotypes related with Notostraca activities.
Based on experiments undertaken with current Lepidurus, it was shown that Acripes, Rusophycus and Cruziana could be attributed to Notostraca.