Planispectrum

Life-forms

Superregnum: Eukaryota
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: Dataminae
Tribus: Datamini
Genus: Planispectrum
Species: P. bakiensis – P. bengalensis – P. cochinchinensis – P. hainanensis – P. hongkongense – P. javanense – P. pusillus
Name

Planispectrum Rehn & Rehn, 1939
Synonyms

Platymorpha Redtenbacher, 1906
Platyphasma Uvarov, 1940

References

Paul D. Brock 2015: Phasmida Species File (Version 5.0/5.0) [1]

The genus Planispectrum combines very small and compact species from Southeast Asia.[1]

Characteristics

Planispectrum is the smallest genus of the Dataminae. The males of the previously known species reach lengths of 18.5 to 26.4 millimetres (0.73 to 1.04 in), the females are 23.6 to 30.9 millimetres (0.93 to 1.22 in) long. In addition to the small size, the flat body and the very short antennae, which are hardly longer than the femura of the forelegs, are characteristic of the genus. In all species the antennae are shorter than the legs as a whole. The first antenna segment (scapus) is always toothed. Tubercles or teeth can be seen on the top of the head. The pronotum is trapezoidally widened posteriorly. The Metanotum is square. The margins of thorax and abdomen may be serrated. The meta pleura have no spines. The abdominal segments are very short and wide. The ventrally located subgenital plate of the female is blunt and no longer than the dorsaly located operculum. The same is swollen and rounded. It shows a rounded lip at the end. The legs are very short and have no teeth or thorns.[2][3]
Distribution area, way of life and reproduction

The distribution area of the genus extends from South China and Hong Kong over Vietnam, Malay Peninsula, Singapore, Sumatra and Borneo to Java. The representatives of the genus are extremely difficult to find and live close to the ground, where they usually hide under leaves lying on the ground. Only after heavy rain do they climb into the bushes to avoid the water.[2][3][4][5][6][7]
Taxonomy

Datamini

Epidares     Dares         Planispectrum       Pylaemenes species from Borneo       Pylaemenes pui       Pylaemenes coronatus     Orestes

 
 
Relationships of the genus Planispectrum within the Dataminae genera examined by genetic analysis so far[8]

As early as 1906, Josef Redtenbacher described the first two species of the species listed today in Planispectrum in a genus specially established for this with Platymorpha cochinchinensis and Platymorpha bengalensis.[9] Since Platymorpha is a genus of the leaf beetles (Chrysomelidae) already described in 1888, James Abram Garfield Rehn and his son John William Holman Rehn described the genus in 1939 new as Planispectrum. In relation to Phasmatodea, Platymorpha is therefore a senior synonym to Planispectrum. As type species they set Planispectrum cochinchinensis.[10] Also the Russian entomologist Boris Uvarov noticed the synonymy of Platymorpha. Unaware of the renaming by Rehn and Rehn, he renamed the genus to Platyphasma in 1940. This name is therefore a junior synonym for the older name Planispectrum. A species also described by Redtenbacher in 1906 as Datames pusillus was transferred to the genus Planispectrum by Oliver Zompro in 2004. Zompro also described three other species. Two of them based on relatively freshly collected material and the third (Planispectrum javanense) after examining the type material of Planispectrum bengalensis based on a paralectotype.[3] The last species to be described was Planispectrum hainanensis in 2008, initially in the genus Pylaemenes. It was transferred to Planispectrum by George Ho Wai-Chun in 2013.[11]

Valid species are:[1]

Planispectrum bakiensis Zompro, 1998
Planispectrum bengalensis (Redtenbacher, 1906)
Planispectrum cochinchinensis (Redtenbacher, 1906)
Planispectrum hainanensis (Chen & He, 2008)
Planispectrum hongkongense Zompro, 2004
Planispectrum javanense Zompro, 2004
Planispectrum pusillus (Redtenbacher, 1906)

In their work on the radiation and relationships within the Heteropterygidae, which was mainly based on genetic analysis and was published in 2021, Sarah Bank et al also examined a species of this genus with Planispectrum bengalensis. In the subfamily Dataminae, the genus forms a sister group with a clade formed by the genera Pylaemenes and Orestes.[8]
References

Brock, P. D.; Büscher, T. H. & Baker, E. W.. Phasmida Species File Online. Version 5.0/5.0 (accessdate 16 June 2021)
Bragg, P. E. (2001). Phasmids of Borneo, Natural History Publikations (Borneo) Sdn. Bhd., Kota Kinabalu, Sabah, Malaysia, pp. 124 & 180–183, ISBN 983-812-027-8
Zompro, O. (2004). Revision of the genera of the Areolatae, including the status of Timema and Agathemera (Insecta, Phasmatodea), Goecke & Evers, Keltern-Weiler, pp. 218–219 & 227–240, ISBN 978-3931374396
Seow-Choen, F. (2005). Phasmids of Peninsular Malaysia and Singapore, Natural History Publikations (Borneo) Sdn. Bhd., Kota Kinabalu, Sabah, Malaysia, p. 104, ISBN 983-812-109-6
Seow-Choen, F. (2016). A Taxonomic Guide to the Stick Insects of Borneo, Natural History Publikations (Borneo) Sdn. Bhd., Kota Kinabalu, Sabah, Malaysia, pp. 392–396, ISBN 978-983-812-169-9
Seow-Choen, F. (2018). A Taxonomic Guide to the Stick Insects of Sumatra Vol. 1, Natural History Publications (Borneo) Sdn. Bhd., Kota Kinabalu, Sabah, Malaysia, p. 591, ISBN 978-983-812-190-3
Seow-Choen, F. (2017). A Taxonomic Guide to the Stick Insects of Singapore, Natural History Publications (Borneo) Sdn. Bhd., Kota Kinabalu, Sabah, Malaysia, p. 39, ISBN 978-983-812-182-8
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
Redtenbacher, J. (1906). Die Insektenfamilie der Phasmiden. Vol. 1. Phasmidae Areolatae. Verlag Wilhelm Engelmann, Leipzig, pp. 46–47 & 52–53
Rehn, J. A. G. & Rehn, J. W. H. (1939). Proceedings of The Academy of Natural Sciences (Vol. 90, 1938), Philadelphia, p. 484.
Ho Wai-Chun, G. (2013). Zootaxa 3669 (3): Contribution to the knowledge of Chinese Phasmatodea II: Review of the Dataminae Rehn & Rehn, 1939 (Phasmatodea: Heteropterygidae) of China, with descriptions of one new genus and four new species, Magnolia Press, p. 211, ISSN 1175-5326