HEMARIS AKSANA (Le Cerf, 1923)

GB: Atlas Bee Hawkmoth

Haemorrhagia tityus aksana Le Cerf, 1923, Bull. Soc. ent. Fr.: 199.

Type locality: Azrou, Middle Atlas, Morocco.

(Taxonomic notes. (i) Eitschberger et al. (1989) raised subsp. aksana to specific rank but gave no valid reasons for doing so; however, recent studies indicate that aksana is indeed a good species, with genitalia different from Hemaris tityus (Linnaeus, 1758).

(ii) Recent DNA barcoding studies indicate that Hemaris galunae (Eitschberger, Müller & Kravchenko, 2005) from the Levant is related to this species. The two species, which are related to Hemaris tityus, appear to be the western and eastern remnants of a species which once occurred right across a cooler, greener and wetter North Africa during the last ice age.)


BIOGEOGRAPHICAL AFFILIATION

Holarctic; western Palaearctic region. Pleistocene refuge: Monocentric -- Atlantomediterranean and Mauritanian subsections of the Mediterranean refuge. Part of the present-day relict Mauritanian faunal element centred on the Middle and High Atlas Mountains (see de Lattin, 1967).


ADULT DESCRIPTION AND VARIATION

Male Hemaris aksana, Ifrane, Morocco. Photo: © Tony Pittaway.

Wingspan: 44--51mm. Similar to Hemaris tityus, but the green of the thorax is less yellowish. Grey basal area of the forewing extended and marginal band blackish and broader than in Hemaris tityus.


Hemaris aksana, Morocco. Photo: © Tony Pittaway.

ADULT BIOLOGY

Diurnal. A species of flower-rich meadows between 1300 and 2500m.

This species is active during the day, generally between 10.00 and 15.00 hours, when it can be seen flitting rapidly from flower to flower. Although mimicking a bumble bee in coloration, its flight is much more rapid and agile. Its skill is superbly demonstrated during courtship when pairs chase each other low over the ground as well as spiralling upwards like a whirlwind. Copulation generally follows, with pairs remaining in copula for up to two hours.


Typical mountain habitat of Hemaris aksana, Ifrane, Morocco. Photo: © Tony Pittaway.

FLIGHT-TIME

In its warmest locations, on the wing in March, June and August; at higher altitude, the latter half of May or June as a single brood, sometimes with a partial second brood in August (Rungs, 1981).


EARLY STAGES

OVUM: Small (1.1 x 1.0mm), almost spherical, with a small depression on top; pale glossy green. Laid singly on the underside of a leaf of the hostplant, with up to six per plant or group of plants not uncommon.

LARVA: Full-fed 50mm.

The newly-hatched, white larva is about 3mm long and covered with small black tubercles bearing forked, black hairs. The caudal horn is small with two black hairs at its apex. With each moult and feeding the body and tubercles gradually become green, the horn redder, and pale dorso-lateral and ventro-lateral lines appear along the side. Fully grown, most are whitish green with a dull red horn, purple-red ventral surface and with purple-red surrounds to the spiracles. The body is very rough to the touch. Many are heavily spotted with additional reddish blotches, especially those feeding on purple-spotted scabious leaves. When fully grown, such blotches are masked as the larva turns a rich plum colour prior to pupation.

Throughout its life, the larva generally remains beneath a leaf, nibbling holes on either side of the midrib on which it rests. Most active at night; if disturbed during the day, it will drop to the ground, many even taking shelter there when not feeding. A noteworthy feature of this species is the variation in growth-rate of larvae of the same brood; however, all tend to mature much more rapidly than those of other sphingids.

Hostplants. Scabiosa spp.

PUPA: 24--27mm. Typically Hemaris in shape, but blackish brown, tinted with reddish brown at the juncture of each segment. Body tapers at either end, with two sharp head tubercles and a flat triangular cremaster. Formed in a rather strong but coarse cocoon among grass tussocks, or slightly into the soil. The overwintering stage.


PARASITOIDS

None recorded.


DISTRIBUTION

Known only from the Middle and High Atlas Mountains of Morocco (Rungs, 1981), but may be more widespread in these mountains.

Extra-limital range. None.


OTHER SUBSPECIES

None.


Return to species list