Decapoda Sentence Examples

In the Decapoda the branchial system is more complex.

It is among the Malacostraca, however, and especially in the Decapoda, that the " gastric mill " reaches its greatest perfection.

In the Decapoda the antennal gland is largely developed and is known as the " green gland."

In the Decapoda three pairs are thus modified, and in the Tanaidacea, Isopoda and Amphipoda only one.

A minute entosternite having the above-described structure is found in the Crustacean Apus between the bases of the mandibles, and also in the Decapoda in a similar position, but in no Crustacean does it attain to any size or importance.

In the Decapoda, where the antennal gland alone is well-developed in the adult, the maxillary gland sometimes precedes it in the larva.

This is seen, for example, in the Brachyura among the Decapoda.

In the Ostracoda and Copepoda the phosphorescence, as already mentioned, is due to glands which produce a luminous secretion, and this is the case also in certain members of the Schizopoda and Decapoda.

In addition, some of the appendages in the neighbourhood of the genital apertures may be modified for the purpose of transferring the genital products to the female, as, for instance, the first and second abdominal limbs in the Decapoda.

In the higher Decapoda, numerous additional centres are developed in the brain and its structure becomes extremely complex.

In the Malacostraca it is absent in the adult, or persists only in a vestigial condition, as in some Decapoda and Schizopoda.

It is most typically developed in the most specialized Decapoda, the Brachyura, while the more primitive groups of Malacostraca, the Euphausiidae, Penaeidea and Stomatopoda, retain the primitive order of appearance C FIG.

In Palaeozoic formations, from the Upper Devonian onwards, numbers of shrimp-like forms are found which have been referred to the Schizopoda and the Decapoda, but here again the scanty information which may be gleaned as to the structure of the limbs rarely permits of definite conclusions as to their affinities.

In the majority of the Decapoda there is a saccular invagination of the integument in the basal segment of the antennular peduncle having on its inner surface " auditory " setae of the type just described.

In the higher Decapoda the male is generally larger than the female and has stronger chelae.