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Two New Species of Aetideopsis (Copepoda, Aetideidae) from the Eastern Indian Ocean

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[Two new species of the genus Aetideopsis (Copepoda, Calanoida, Aetideidae) are described from Scott Reef, Western Australia (14.05°S 121.85°E). The two species co-occurred in a channel approximately 450 m in depth separating the two adjacent coral atolls of the Scott Reef complex. Aetideopsis rhinoceros n. sp. is remarkable for the development of the right branch of the bifurcate rostrum into a large horn, which is recurved and directed antero-dorsally in the female, but is straighter and directed ventrally in the male. Aetideopsis browsei n. sp. is superficially similar to A. tumorosa Bradford, 1969, but differs in the form of the rostrum, in having shorter pointed processes on Th5, and in having 10 rather than 9 setae on endopod segment 2 of the mandible palp. Zwei neue Arten der Gattung Aetideopsis (Copepoda, Calanoida, Aetideidae) von Scott Reef, Western Australia (14.05°S 121.85°E) werden beschrieben. Die beiden Arten traten zusammen in einem ca. 450 m tiefen Kanal auf, welcher die beiden benachbarten Korallenatolle des Scott ReefKomplexes trennt. Bemerkenswert für Aetideopsis rhinoceros n. sp. ist die Ausbildung des rechten Astes des gabelförmigen Rostrums zu einem langen Horn, welches bei dem Weibchen umgebogen und antero-dorsal gerichtet ist, bei dem Männchen dagegen weniger gebogen und ventral gerichtet. Aetideopsis browsei n. sp. ähnelt oberflächlich betrachtet A. tumorosa Bradford, 1969, unterscheidet sich aber in der Form des Rostrums, sowie in kürzeren spitzen Fortsätzen am Th5 und in der Anzahl der Elemente am zweiten Endopodsegment des Mandibularpalpes, mit 10 anstelle von 9 Fiederborsten., Two new species of the genus Aetideopsis (Copepoda, Calanoida, Aetideidae) are described from Scott Reef, Western Australia (14.05°S 121.85°E). The two species co-occurred in a channel approximately 450 m in depth separating the two adjacent coral atolls of the Scott Reef complex. Aetideopsis rhinoceros n. sp. is remarkable for the development of the right branch of the bifurcate rostrum into a large horn, which is recurved and directed antero-dorsally in the female, but is straighter and directed ventrally in the male. Aetideopsis browsei n. sp. is superficially similar to A. tumorosa Bradford, 1969, but differs in the form of the rostrum, in having shorter pointed processes on Th5, and in having 10 rather than 9 setae on endopod segment 2 of the mandible palp. Zwei neue Arten der Gattung Aetideopsis (Copepoda, Calanoida, Aetideidae) von Scott Reef, Western Australia (14.05°S 121.85°E) werden beschrieben. Die beiden Arten traten zusammen in einem ca. 450 m tiefen Kanal auf, welcher die beiden benachbarten Korallenatolle des Scott ReefKomplexes trennt. Bemerkenswert für Aetideopsis rhinoceros n. sp. ist die Ausbildung des rechten Astes des gabelförmigen Rostrums zu einem langen Horn, welches bei dem Weibchen umgebogen und antero-dorsal gerichtet ist, bei dem Männchen dagegen weniger gebogen und ventral gerichtet. Aetideopsis browsei n. sp. ähnelt oberflächlich betrachtet A. tumorosa Bradford, 1969, unterscheidet sich aber in der Form des Rostrums, sowie in kürzeren spitzen Fortsätzen am Th5 und in der Anzahl der Elemente am zweiten Endopodsegment des Mandibularpalpes, mit 10 anstelle von 9 Fiederborsten.]

Affiliations: 1: Australian Institute of Marine Science, PMB No. 3, Townsville M.C., Queensland 4810, Australia;, Email: d.mckinnon@aims.gov.au; 2: Australian Institute of Marine Science, PMB No. 3, Townsville M.C., Queensland 4810, Australia

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