Sphingidae Taxonomic Inventory

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Beobachtungen zur Ökologie zweier Taxa der hearseyi-Gruppe aus Vietnam und Indonesien (Lepidoptera: Brahmaeidae)

Publication Type:Journal Article
Year of Publication:2021
Authors:U. Paukstadt, Paukstadt, L. H., Nguyen, H. B.
Journal:Beiträge zur Kenntnis der wilden Seidenspinner
Start Page:591
Date Published:10/2021

"This contribution to knowledge the family Brahmaeidae SWINHOE, 1892 (Lepidoptera) is specifically dealing with the circadian flight times of Brahmaea (Brahmophthalma) hearseyi WHITE, 1862 [“1861”] from northern Vietnam and of B. (Brahmophthalma) loeffleri NAUMANN & BROSCH, 2005 from northern Sumatra, Indonesia. B. (Brahmophthalma) hearseyi was observed on the wings mainly from March till June (exceptionally September) which might indicates at least a bivoltine lifecycle. The altitudinal distribution was observed between 965 and 1,460 (and 104) m in northern Vietnam. B. (Brahmophthalma) hearseyi came to light usually between 19:08 and 20:26 hours local time, latecomers until the early morning. The closely related B. (Brahmophthalma) loeffleri from the Nanggroe Aceh Darussalam Province, northern Sumatra, Indonesia was observed on the wings from mid January till mid June with a clear peak in April. Scattered records from the remaining provinces of the island of Sumatra were from August, September and October from which one could conclude an at least bivoltine lifecycle, too. The altitudinal distribution was observed between 966 and 1,800 (and 116) m with a clear peak at 1,800 m. B. (Brahmophthalma) loeffleri came to light usually between 19:15 and 20:30 hours local time. The approaching times given here refer to the local time; the Time Zone is the same in Vietnam and in western Indonesia (WIB) with UTC +7 hours. Depending on the latitudes, longitudes and seasons of the observation areas, the times of sunset are different at the collecting sites. In order to be able to compare these approaching times directly, they should be related to the sunset time. If taken this into account, the circadian flight times for Vietnam are about 19-29 minutes later after sunset than those of Aceh due to an earlier sunset in northern Vietnam (approx. 29 minutes in September and 19 minutes in April). However, the circadian flight times of B. (Brahmophthalma) hearseyi from northern Vietnam were observed to be almost the same as in the closely related B. (Brahmophthalma) loeffleri in northern Sumatra. The observations confirm that there are no obvious ecological differences between the Vietnamese and Sumatran populations of the hearseyi-group, as clearly identified, for example, in the circadian flight times of Lemaireia chrysopeplus (TOXOPEUS, 1940) (Java) (02:00 hrs. local time) and the closely related L. jaegeri PAUKSTADT & PAUKSTADT, 2010 (Sumatra) (19:00 hrs. local time) (Lepidoptera: Saturniidae). A generic revision could reveal that all taxa of the hearseyi-group should belong to only one species, since there are also no unambiguous genetic differences (at BOLD), though populations are grouping weakly geographically. No taxonomic changes are proposed."

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