Mearnsiana

Life-forms

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: Arthropoda
Subphylum: Hexapoda
Classis: Insecta
Cladus: Dicondylia
Subclassis: Pterygota
Cladus: Metapterygota
Infraclassis: Neoptera
Supercohort: Polyneoptera
Cohort: Anartioptera
Magnordo: Polyorthoptera
Superordo: Orthopterida
Ordo: Phasmatodea
Subordo: Verophasmatodea
Infraordo: Areolatae
Superfamilia: Bacilloidea

Familia: Heteropterygidae
Subfamilia: Obriminae
Tribus: Miroceramiini
Genus: Mearnsiana
Species: M. bullosa
Name

Mearnsiana Rehn & Rehn, 1939
Synonyms

Hennobrimus Conle, 2006

References

Paul D. Brock 2018: Phasmida Species File (Version 5.0/5.0) [1]
Hennemann, F.H., Conle, O.V., Brock, P.D. & Seow-Choen, F. 2016. Revision of the Oriental subfamily Heteropteryginae Kirby, 1896, with a re-arrangement of the family Heteropterygidae and the descriptions of five new species of Haaniella Kirby, 1904. (Phasmatodea: Areolatae: Heteropterygidae). Zootaxa 4159(1): 1–219. DOI: 10.11646/zootaxa.4159.1.1 Reference page.

Mearnsiana is a monotypic genus of stick insects, containing Mearnsiana bullosa as the so far only described representative.[1][2]

Taxonomy

In 1939 James Abram Garfield Rehn and his son John William Holman Rehn described the species using a male nymph as Mearnsiana bullosa. It was found at the Mount Apo in Mindanao and is deposited as holotype in the National Museum of Natural History in Washington, D.C. The name Mearnsiana is dedicated to the American ornithologist and natural scientist Edgar Alexander Mearns, who found the holotype at the Mount Apo. The specific epithet bullosa means "blistered" and probably refers to the vesicular tubercles coated body surface, especially of the nymphs.[1][3]

In 2005 Ireneo L. Lit, Jr. and Orlando L. Eusebio described a species called Trachyaretaon manobo, which was also found at the Mt. Apo. Their type material is deposited at the University of the Philippines. In the following year Oskar V. Conle also described a remarkably colorful species from Mindanao. He named it Hennobrimus hennemanni in honor of his friend, Frank H. Hennemann, who was also researching phasmids. The type material of this kind is deposited in the Bavarian State Collection of Zoology. A short time later, Conle assumed that this species was the rediscovered Mearnsiana bullosa. The multiple description results from the big difference between the nymph described by Rehn and Rehn and the until 2005 unknown imago. Both Trachyaretaon manobo and Hennobrimus hennemanni were in 2016 by Hennemann et al synonymized with Mearnsiana bullosa. In addition, the species and genus that have been listed in the tribe Miroceramiini since 2004 have been transferred back to the tribe Obrimini.[1][4][5][6] A study based on genetic analysis published in 2021 show that there is a second, undescribed species in the genus up to now monotypic which was found in the north of Dinagat Island.[2]
Description

The species, wingless and thornless in both sexes, is the most colorful of the known representatives of the family Heteropterygidae. The body surface is shiny. The 4.5 centimetres (1.8 in) to 5.1 centimetres (2.0 in) long males have an olive green basic color. The joint membranes and partly also the margins of the individual segments are colored bright yellow. meso- and metathorax are colored orange-brown above and below and have two pairs of slightly darker humps on the upper side. The coloring of the upper side of the abdomen is striking. A wide yellow vertical stripe runs along its entire length, flanked by two green stripes and two red stripes towards the edge. With more than 5 centimetres (2.0 in) the antennae are good body length. At 8 centimetres (3.1 in) to 9.8 centimetres (3.9 in), the females are significantly longer than the males. Their antennae are with about 5 centimetres (2.0 in) in length shorter than the body. This is colored bright green or a bit more plain green-brown on the top. Legs, antennae and ovipositor are always light brown. The color of the underside varies from orange brown to slightly purple. The abdomen can swell significantly during egg production. The abdomen ends in a long, straight secondary ovipositor, which surrounds the actual ovipositor.[4][7][8]
Distribution and way of life

Mearnsiana bullosa has so far only been found in the Philippine Province of Cotabato of Mindanao, where it is particularly common in the area around the Mount Apo was found. Another, still undescribed species of the genus was found at Mount Redondo in the north of Dinagat Island.[2]

The species is nocturnal like the other members of the family, but adult specimens do not hide during the day, but hang freely in the food plant. When touched, they drop to the ground and then usually start running immediately. Plants from the genus Leptospermum and Casuarina on which the animals were found belong to the natural food spectrum. The bulbous-shaped eggs are laid in the ground as a clutch of 20 to 30 eggs at intervals of 2 to 3 weeks. They are gray in color, 5.1 millimetres (0.20 in) long, about 3.7 millimetres (0.15 in) wide and have a black lid (operculum). The micropylar plate has four arms and its shape resembles a horizontally flattened "X". The two upper arms can also flow together to form a single, wider arm. After about 3 to 5 months the nymphs hatch. Their bodies and legs are very flat and almost black except for a light spot between pro- and mesonotum. At first they walk around very briskly with their abdomen rolled forward. The white margins of the abdomen on the underside are shown. This behavior only changes with the start of food intake and the nymphs, which are now gradually getting lighter, nestle flat against twigs or branches of the food plants, making them barely detectable. Older stages develop a light brown and pale green camouflage pattern, which is complemented by a kind of white lichen pattern. They keep their flat shape until the last moult and have a dull and relatively blistered body surface. Males are adult after around 5 to 6 months. Females need about one month longer.[4][5][7][8]
In terraristics

Dave Navarro collected animals of this species at Mt. Apo in April 2008. From the eggs he had sent to Europe, the Swiss phasmid breeder Bruno Kneubühler established the first breeding stock of the species. A second stock goes back to animals also collected in 2008 by Joachim Bresseel, Mark Bushell and Ellen Caluwe. From the Phasmid Study Group Mearnsiana bullosa has been listed under PSG number 338 since the middle of 2013.[9]

Mearnsiana bullosa is easy to keep and breed. A higher humidity is preferred. A suitable substrate must be offered for laying eggs (soil on the terrarium floor). Leaves of bramble and many other Rosaceae are eaten in captivity, as well as those of Hypericum, hazel, oak and salal.[4][5][8]
Gallery

Eggs

Subadult female

Ventral view of a male

Ventral view of a freshly adult female

References

Brock, P. D.; Büscher, T. H. & Baker, E. W.: Phasmida Species File Online. Version 5.0./5.0 (accessdate 23 June 2021)
Bank, S.; Buckley, T. R.; Büscher, T. H.; Bresseel, J.; Constant, J.; de Haan, M.; Dittmar, D.; Dräger, H.; Kahar, R. S.; Kang, A.; Kneubühler, B.; Langton-Myers, S. & Bradler, S. (2021). Reconstructing the nonadaptive radiation of an ancient lineage of ground-dwelling stick insects (Phasmatodea: Heteropterygidae), Systematic Entomology, DOI: 10.1111/syen.12472
Rehn, J. A. G. & Rehn, J. W. H. (1939). Proceedings of The Academy of Natural Sciences (Vol. 90, 1938), Philadelphia, pp. 458–460.
Dräger, H (2012) Gespenstschrecken der Familie Heteropterygidae Kirby, 1896 (Phasmatodea) – ein Überblick über bisher gehaltene Arten, Teil 3: Die Unterfamilie Obriminae Brunner von Wattenwyl, 1893, Triben Miroceramiini und Eubulidini Zompro, 2004, ZAG Phoenix, Nr. 6. Juni 2012 Jahrgang 3(2), pp. 2–21, ISSN 2190-3476
Breeding instructions for Mearnsiana bullosa on phasmatodea.com by Bruno Kneubühler
Hennemann, F. H.; Conle, O. V.; Brock, P. D. & Seow-Choen, F. (2016). Revision of the Oriental subfamiliy Heteropteryginae Kirby, 1896, with a re-arrangement of the family Heteropterygidae and the descriptions of five new species of Haaniella Kirby, 1904. (Phasmatodea: Areolatae: Heteropterygidae), Zootaxa 4159 (1), Magnolia Press, Auckland, New Zealand, ISSN 1175-5326
Esch, A. (2012) Stabschrecken, Gespenstschrecken, Wandelnde Blätter: Erfolgreiche Haltung von Phasmiden. Natur und Tier-Verlag, Münster, pp. 78–80, ISBN 978-3-86659-221-6
Sijbrants, R. (2011) Speciesreport 40: Mearnsiana bullosa (Rehn & Rehn, 1939), Phasma Werkgroep, Nr. 81 Juni 2011, Jahrgang 21, pp. 3–5, ISSN 1381-3420
Phasmid Study Group Culture List