Hagenulus morrisonae Peters and Alayo, 1971

L, Carlos Naranjo, Peters, Janice G., del, Pedro López & Castillo, 2019, Ephemeroptera (Insecta) in Cuba, Insecta Mundi 2019 (736), pp. 1-52 : 12

A.16. Hagenulus morrisonae Peters and Alayo, 1971

Figures 8 , 44 .

Hagenulus morrisonae Peters and Alayo in Peters 1971:21 (male and female imagos, nymph); Kluge 1994:260.

Holotype. Male imago, [Province Santiago de Cuba], Río Boniatico ( San Luis ), November 1964, P. Alayo.

This species was described by Peters and Alayo (in Peters 1971) from Santiago de Cuba Province and other localities in the Eastern and Central region. It is easily distinguished from H. caligatus by the width of the labrum which, although broad, is narrower than the width of the head.

Ecology. Nymphs prefer stony rivers and streams with little current and clean water and are usually found at a depth of 15−30 cm ( Peters 1971). Alayo (in Peters 1971) found the subimagos throughout the day and found imagos in the evening (1700 to 1800 h) flying near the surface of the water in stony areas, the number of individuals increasing as it became darker.

Nymphs of H. morrisonae show a clear preference for a riffle microhabitat (in one survey, 2035 individuals in riffles and 58 individuals in a lentic habitats). Aldana and Fonseca (2001) confirmed that the species prefers clear, cold, running waters at altitudes between 250 and 650 m; there, nymphs were found under stones at depths of 30−90 cm. Nymphs in collections are very abundant from lowland areas, with most (527) found in the Río Cautillo basin below 200 m ( Rodríguez and Pérez 1998); numbers of individuals decrease as the altitude increases. Naranjo (1986) studied six rivers in the Sierra Maestra and found the species below 600 m; in other collection records, the species has been found up to 1750 m, but the majority of specimens are recorded below 500 m. Based on the presence of mature nymphs in the collections and their respective dates, there is no seasonal trend as they were collected in every month of the year.

Geographic distribution. The species is very abundant ( Fig. 8 ) and has been cited from the Central, Central-East and Eastern Regions in the Cuban archipelago ( Peters 1971, Kluge 1994, Naranjo and Cañizares 1999). One population from Nipe-Sagua-Baracoa Massif has been confused with H. caligatus because of its broader labrum ( Fig. 44c ).

Figures

Figures 6–9. Distribution records for Ephemeroptera in Cuba.6) Paracloeodes lilliputian. 7) Farrodes bimaculatus. 8) Hagenulus caligatus, H. morrisonae. 9) Borinquena sexta, Turquinophlebia grandis, Poecilophlebia pacoi.

Figures 41–46. Leptophlebiidae. 41) Poecilophlebia pacoi. 41a) Lateral margins of abdominal terga.41b) Habitus. 41c) Abdominal color pattern. 41d) Gill. 41e) Labrum with detail of anteromedian margin. 42) Turquinophlebia grandis. 42a) Color pattern of abdominal tergum 5. 42b) Labrum with detail of anteromedian margin.43) Hagenulus caligatus. 44) Hagenulus morrisonae. 44a) Head. 44b) Head. 44c) Head (variation, Nipe-Sagua-Baracoa Massif). 45) Careospina baconaoi, head. 46) Careospina hespera sierramaestrae, head. Figures 41d–42 after Kluge 1994; 43–44a after Peters 1971.