Crustacea Decapoda: le genre Eumunida Smith 1883 (Chirostylidae) dans les eaux néo-calédoniennes
de Saint Laurent, M.; MacPherson, E. (1990). Crustacea Decapoda: le genre Eumunida Smith 1883 (Chirostylidae) dans les eaux néo-calédoniennes, in: Crosnier, A. (Ed.) Résultats des Campagnes MUSORSTOM 6. Mémoires du Muséum national d'Histoire naturelle. Série A, Zoologie, 145: pp. 227-288
In: Crosnier, A. (Ed.) (1990). Résultats des Campagnes MUSORSTOM 6. Mémoires du Muséum national d'Histoire naturelle. Série A, Zoologie, 145. Muséum national d'Histoire naturelle/ORSTOM: Paris. ISBN 2-85653-171-7. 388 pp., more
In: Mémoires du Muséum national d'Histoire naturelle. Série A, Zoologie. Editions du Muséum: Paris. ISSN 0078-9747, more
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| Authors | | Top |
- de Saint Laurent, M.
- MacPherson, E.
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| Abstract |
The genus Eumunida, belonging to the family Chirostylidae, is represented in New Caledonia and Chesterfield Islands by seven species, all of them new to Science: Eumunida keijii, E. sternomaculata, E. annulosa, E. capillata, E. parva, E. minor and E. marginata. Four species (E. sternomaculata, E. annulosa, E. capillata, and E. parva) are very common at depths between 400 and 600 meters, being currently caught at the same stations. The other species are scarce, and have been collected either at the same depths (E. keijii), or in shallower waters (E. minor and E. marginata). The high abundance of these species could be related to the presence on the bottom of hydrocorallians of the family Stylasteridae. Three species (E. keijii, E. annulosa and E. sternomaculata) belong to the group A after GORDON (1930), characterized by a spine on either side of the sternal segment bearing the chelipeds. The latter two of these species have a pad on the ventral surface of the palm. E. keijii is closely related to E. pacifica Gordon, 1930, from the south of Timor, but, among other differences, the two are readily distinguished by the size of the first hepatic spine, the median sinus of the third thoracic sternite and the scales on the sternal segments. E. sternomaculata resembles E. sp., from southeast Australia (E. picta, GORDON, 1930, in part) ; both ar nevertheless easily distinguished by the shape of th frontal part of the carapace, the direction of the supraorbital spines and the relative lengths of the anterolateral spines and antennal peduncles. E. annulosa is close to E. sternomaculata. These tWo species are differentiated by the shape of the rostral spines, the ornamentation of the carapace, the length and shape of the chelipeds and the presence or absence of a disto-mesial spine on the carpus of the chelipeds. E. marginata, E. capillata, E. parva and E. minor belong to the group B, after GORDON, that has no spine on either side of the sternal segment bearing the che1ipeds. With the exception of E. parva, all the other species are provided with a pad on the ventral surface of the palm. E. parva is closely related to E. smithii Henderson, 1883, from the south of Timor, and to E. propior Baba, 1988, from the Philippines. A discussion about the identity of the material of E. smithii from different expeditions and the relationships between the three species is provided. The males of these three species are characterized by the presence of pleopods on the second to fifth abdominal segments. E. capillata is very close to E. parva, but can be easily distinguished from it by a number of characters. The main difference is the presence of a pad on the ventral surface of the cheliped palm in capillata, and its absence in parva. E. minor is the smallest representative of the genus. The species is clearly distinguishable from all the others of the group B by the presence of two prominent spines on the merus of the third maxillipeds, and of four longitudinal rows of spines on the merus of the chelipd. Its closest relative is E. balssi Gordon, 1930. E. marginata is related to E. gordonoae Baba, 1973, from Japan. However, the length and the spinulation of the pereopods are very different. |
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